Last update 16 Sep 1999
ACCLAIM DEEP OCEAN BOTTOM PRESSURE RECORDER (BPR) STATIONS
==========================================================
File format (FF) A indicates ACCLAIM Format (with 11 columns, and a 4 digit year - see
file README.ACCLAIM.FORMATS under pub/woce/acclaim for a description.)
Note that these are DEEP SEA pressure records, not from coastal pressure
sensors, so station names like 'Amsterdam' are just convenient labels. Also
depths shown are approximate only.
The 'IAPSO' column shows the codes used for these records within the
IAPSO/PSMSL Pelagic Tidal Constants data set.
Indian Ocean
============
Station Lat Long Depth Start End FF Filename IAPSO
Amsterdam 37 54.10S 77 34.16E 310m 26-Jul-84 15-Feb-85 A amsterdam.8485 3.2.9
Amsterdam 37 54.10S 77 37.16E 178m 20-Mar-86 22-Dec-86 A amsterdam.8686 3.2.10
Amsterdam 37 54.10S 77 37.16E 165m 23-Dec-86 21-Dec-87 A amsterdam.8687 3.2.11
Amsterdam 37 54.10S 77 37.16E 180m 22-Dec-87 19-Dec-88 A amsterdam.8788 3.2.12
Amsterdam 37 54.00S 77 35.00E 470m 20-Mar-86 21-Dec-87 A amsterdam.deep.8687 3.2.17
Amsterdam 37 54.00S 77 35.00E 460m 23-Dec-87 19-Dec-88 A amsterdam.deep.8788 3.2.18
Amsterdam 37 54.26S 77 34.83E 350m 11-May-91 31-Jan-92 A amsterdam.9192 -
Amsterdam 37 53.00S 77 35.00E 350m 01-May-92 11-Jul-93 A amsterdam.9293 -
Amsterdam 37 54.20S 77 34.72E 350m 11-Jul-93 23-Oct-94 A amsterdam.9394 -
Amsterdam 37 54.19S 77 34.71E 350m 24-Oct-94 30-Nov-95 Contact PSMSL/POL -
Kerguelen 48 51.50S 70 10.00E 105m 27-Feb-86 17-Dec-86 A kerguelen.8686 3.2.13
Kerguelen 48 51.50S 70 10.00E 106m 18-Dec-86 18-Dec-87 A kerguelen.8687 3.2.14
Kerguelen 48 51.50S 70 10.00E 106m 18-Dec-87 15-Dec-88 A kerguelen.8788 3.2.15
Kerguelen 48 51.60S 70 10.80E 103m 16-Dec-88 31-Dec-89 A kerguelen.8889 -
Kerguelen 47 39.60S 69 21.69E 185m 06-Jul-93 20-Oct-94 A kerguelen.9394 -
ID2 28 19.18S 66 49.68E 3650m Aug-84 Feb-85 A id2.8485 3.2.16
Crozet 46 23.95S 51 56.52E 160m 30-Jun-93 09-Oct-94 A crozet.9394 -
CK2 46 52.26S 52 28.29E 3600m 09-Mar-93 03-Mar-94 A ck2.9394 3.2.19/20/21
Equatorial and South Atlantic
=============================
Station Lat Long Depth Start End FF Filename IAPSO
FP1 00 00 N 20 01 W 2700m Feb-83 Sep-84 A fp1.8384 1.3.16
FP3 (=IAPSO 1.3.17) on Atlantic equator to be added
FP4 (=IAPSO 1.3.18) .. .. ..
Tristan-A 35 31.00S 11 02.00W 4080m 06-Nov-85 03-Oct-86 A tdca1.data-d 1.4.14/15/16
Tristan-A 35 31.00S 11 02.00W 4082m 04-Oct-86 26-Sep-87 A tdca1.data-d 1.4.17/18
Tristan-A 35 32.00S 11 00.00W 4090m 27-Sep-87 08-Oct-88 A tdca3.data-d 1.4.19
Tristan-B 37 00.00S 14 29.00W 3505m 02-Oct-86 25-Sep-87 A tdcb2.data-d 1.4.20/21/22
Tristan-C 38 31.00S 11 09.00W 3435m 02-Nov-85 30-Sep-86 A tdcc1.data-d 1.4.23/24/25
Tristan-C 38 31.00S 11 09.00W 3120m 21-Oct-86 24-Sep-87 A tdcc2.data-d 1.4/26/27/28
Marfrio 31 59.9 S 36 00.7 W 2604m 1-May-95 5-May-96 A marfrio.4p -
(data exist after May 96, see below)
PAVASAS 0 13.96N 41 12.62W 104M 23-Jul-87 29-Aug-87 A pavasas_2.dat -
Drake Passage/Scotia Sea
========================
Station Lat Long Depth Start End FF Filename IAPSO
FS1 53 32.39S 57 00.90W 2803m 27-Nov-88 11-Nov-89 A fs1.8889.acc 1.4.5/6/7
FS1 53 32.39S 57 01.89W 2800m 11-Nov-89 21-Nov-90 A fs1.8990.acc 1.4.8/9/10
FS1 53 30.70S 56 58.80W 2800m 21-Nov-90 09-Jan-92 A fs1.9092.acc 1.4.11/12/13
FS1 53 31.40S 57 01.90W 2800m 12-Jan-92 15-Nov-92 A fs1.9292.acc -
FS2 56 41.97S 52 32.26W 3150m 28-Nov-88 12-Nov-89 A fs2.8889.acc 4.2.8/9/10
FS2 56 39.93S 52 28.55W 2861m 12-Nov-89 23-Nov-90 A fs2.8990.acc 4.2.11/12/13
FS3 60 02.23S 47 05.99W 2180m 14-Nov-89 24-Nov-90 A fs3.8990.acc 4.2.14/15/16
FS3 60 03.10S 47 05.10W 2010m 23-Nov-90 07-Jan-92 A fs3.9092.acc 4.2.17/18/19
FS3 60 03.10S 47 10.00W 2267m 07-Jan-92 23-Nov-92 A fs3.9292.acc -
ND1 56 29.45S 62 59.13W 3925m 22-Dec-91 06-Nov-92 A nd1.9192 4.2.21
SD1 61 28.43S 61 17.43W 3946m 23-Dec-91 07-Nov-92 A sd1.9192 4.2.24
ND2 54 56.54S 58 23.59W 1010m 09-Nov-92 22-Nov-93 A nd2.9293 1.4.29/30/31
ND2 54 56.58S 58 23.51W 1007m 22-Nov-93 15-Nov-94 A nd2.9394 -
SD2 60 50.99S 54 42.88W 1020m 13-Nov-92 26-Nov-93 A sd2.9293 4.2.27/28/29
SD2 60 50.98S 54 42.84W 1020m 27-Nov-93 21-Nov-94 A sd2.9394 -
December 1996 Drake Passage Recoveries (North to South)
======================================
ND2 54 56.65S 58 23.11W 1052m 16-Nov-94 14-Nov-96 A dpn9496a.a4d -
NNS 56 50.15S 57 30.09W 2096m 26-Nov-95 17-Nov-96 A dpnns956.i4d -
CD 58 21.76S 56 21.28W 3776m 19-Nov-94 18-Nov-96 A dpc9496a.i4d -
Myrtle 59 43.69S 55 29.50W 3690m 13-Nov-92 19-Nov-96 A myr9296.a1d (4.2.30/31 from
first year data)
SD2 60 51.01S 54 43.01W 1040m 21-Nov-94 20-Nov-96 A dps9496.i4d -
As of Jan 97 the deployed POL BPR's are ND2, POL9 and SD2
and a 'mini-Myrtle' near to FS3.
December 1997 Drake Passage Recoveries (North to South)
======================================
ND2 54 56.64S 58 23.02W 1050m 03-Dec-96 19-Dec-97 A dpn9697.a4d -
SD2 60 50.96S 54 43.36W 1170m 20-Nov-96 30-Dec-97 A dps9697.a4d -
BRIEF DOCUMENTATION FOR BPR STATIONS
====================================
Unless stated otherwise, records in this directory were obtained
from deployments by the Proudman Oceanographic Laboratory. Also, unless
stated otherwise, the datum of each record in each file from the same
station (e.g. Amsterdam) should be regarded as being different as it is
impossible to deploy a pop-up sensor at exactly the same location. In
addition, consideration should be given to the fact that all pressure
sensors, especially those at great depths, can be subject to long term
drift.
Station Amsterdam (files amsterdam.*)
=================
This station was occupied by BPR's from POL during 1984-88 and from the
University of Grenoble, France during 1991-94.
POL instrumentation 1984-85 was strain gauge pressure sensor with temperature
also recorded. For 1986-1988, a Paroscientific Digiquartz pressure transducer
was used with temperature also recorded. As stated above, the datum of the
pressure measurements is not maintained from one deployment to the next.
See Vassie et al., Journal of Geophysical Research, 99(C1), 937-949, 1994.
For each POL record a long term instrumental drift has been removed. Station
positions (lat, lon) for the southern Indian Ocean should be regarded as
being uncertain to 1 km (or 1 minute) in these pre-GPS days - if this is an
important factor then notes of the scientists in charge can be consulted as
to SATNAV etc. information.
file amsterdam.8485:
this file is in 11 column ACCLAIM format with three data channels: sea
temperature (deg C), pressure (millibar) and non-tide residual pressure (millibar)
after a tidal analysis. The third channel may be disregarded.
The pressure time series is essentially flat over most of its length but
with a drop of approximately 20 mbar between days 210 and 240 (August 1984).
From comparisons with a second pressure sensor on the rig, which
malfunctioned at day 271, we believe the rapid fall is an instrumental
effect of the strain gauge. See Vassie et al., Journal of Geophysical
Research, 99(C1), 937-949, 1994.
files amsterdam.8686, amsterdam.8687 and amsterdam.8788:
these files are in 11 column ACCLAIM format with one data channel: pressure (millibar).
Data for 2-8 February 1987 were missing and were interpolated using tidal
predictions. Also scans flagged as 'questionable data' data for 8-9 Feb.
files amsterdam.deep.8687 and amsterdam.deep.8788:
these files are in 11 column ACCLAIM format with total pressure in channel 8 in mbar.
These deployments were at a greater depth than the previous ones. See
Vassie et al., Journal of Geophysical Research, 99(C1), 937-949.
For the records for 1991 onwards, obtained from colleagues at the University
of Grenoble, files are in 11 column ACCLAIM format with a single data channel of
pressure in millibar. No attempt has been made to remove possible
long-term drifts in these pressure measurements.
==========================================================================
Station Kerguelen (files kerguelen.*)
=================
This station was occupied by BPR's from POL during 1986-88 and from the
University of Grenoble, France thereafter.
POL instrumentation consisted of Paroscientific Digiquartz pressure
transducers, with long term instrumental drift removed from each of the
records. As with data from Amsterdam and elsewhere, the datum of the
pressure measurements is not maintained from one deployment to the next.
See Vassie et al., Journal of Geophysical Research, 99(C1), 937-949, 1994.
file kerguelen.8686:
this file is in 11 column ACCLAIM format with two data channels: total
pressure (millibar) and residual pressure (millibar) after a tidal analysis.
This second channel may be ignored.
files kerguelen.8687 and kerguelen.8788:
these files are in 11 column ACCLAIM format with one data channel: total pressure
in (millibar).
For the records for 1988 onwards, obtained from colleagues at the University
of Grenoble, files are in 11 column ACCLAIM format with a single data channel of
pressure in millibar. No attempt has been made to remove possible
long-term drifts in these pressure measurements.
==========================================================================
Station ID2 (file id2.8485)
===========
This station was a early POL deployment near to the 'triple point' of the
Indian Ocean ridge.
This file is in 11 column ACCLAIM format with total pressure (mbar) in channel 8.
POSN ID21
INDIAN OCEAN NEAR TRIPLE JUNCTION OF RIDGE
28 19.18 S 66 49.68 E
DEPTH 3650 M(U)
RECORD 3 0200Z 214 1984
" 4898 0100 52 1985
==========================================================================
Station Crozet (file crozet.9394)
==============
This record was contributed to 11 column ACCLAIM by colleagues from the University
of Grenoble, France and covers June 1993 - October 1994. No attempt has
been made to remove possible long-term drifts in the pressure measurements.
File is in 11 column ACCLAIM format with units of millibars for a single sensor.
=========================================================================
Station CK2 (file ck2.9394)
===========
CK2 was station number 2 on the west side of the 'Crozet-Kerguelen line'
during a POL Indian Ocean cruise during March 93 - March 94. This file
has instrumental drift removed and is in 11 column ACCLAIM format. Three pressure
sensors were used: one Quartztronic (column 6 of file) which is very
temperature sensitive; and two Digiquartz (columns 8 and 10) with their own
temperature measurements (columns 7 and 9 respectively) which should be
acceptable.
Units in each channel: 6 (mbar), 7 (deg C), 8 (mbar), 9 (deg C), 10 (mbar)
=========================================================================
Station FP1 (file fp1.8384)
===========
This file is in 11 column ACCLAIM format with total pressure (mbar) in channel 9
obtained from a Digiquartz sensor. (Another total pressure measurement is
in channel 8 but that is noisy). Temperature is in channel 7 (deg C).
The file contains merged data from two separate deployments at almost the
same position - see Cartwright et al., Journal of Geophysical Research,
92(C1), 725-741, 1987 for details.
The deployment was one of several made on the Atlantic equator as part of
the FOCAL experiment.
POSITION FP1
DELPLOYED DURING FOCAL 1983 DAY 34
THIS FILE IS THE COMBINED DATA FROM 2 DEPLOYMENTS
ENDING DAY 268 1984
HOURLY DATA WITH DRIFT REMOVED
CHANNEL 7 TEMPERATURE IN DEG C 2T4
" 8 PRESSURE DATA FROM ORIGINAL CHANNEL 5 B&H3
" 9 " " " 6 DQ7294
PRESSURE IN mBAR
N.B. CHANNEL 8 IS NOISY. USE CHANNEL 9
========================================================================
Stations Tristan-A, -B and -C
=============================
These files are from POL's 'Tristan Triangle Experiment' around Tristan
da Cunha which consisted of a series of BPR measurements made in a 'triangle'
(sites A,B,C) around the island between 1985-88, for details see
Spencer, R., Foden, P.R., McGarry, C., Harrison, A.J., Vassie, J.M.,
Baker, T.F., Smithson, M.J., Harangozo, S.A. and Woodworth, P.L. 1993.
The ACCLAIM programme in the South Atlantic and Southern Oceans.
International Hydrographic Review, 70, 7-21.
Bottom pressure at all three sites was found to be very coherent, for
example see
Hughes, C.W. and Smithson, M.J. 1996. Bottom pressure correlations in the
south Atlantic. Geophysical Research Letters, 23(17), 2243-2246.
Files are in 11 column ACCLAIM format. For each one the Digiquartz transducer channels
are the most quiet i.e.
tdca1.data-d use channels 10
.. a2 .. 9
.. a3 .. 8/9
.. b2 .. 8/10
.. c1 .. 8/10
.. c2 .. 9/10
The -d in the filename indicates that long term drift has been removed from
each pressure channel.
=========================================================================
Station MARFRIO
===============
The Marfrio Mk4 BPR was deployed by the James Clark Ross (Karen Heywood's
cruise) and was recovered by Bob Spencer, Afranio de Mesquita and Carlos
Franca on board the Marfrio fishing boat in early 1997. The deployment
was a collaboration between POL and the Instituto Oceanografico of the
University of Sao Paulo.
Data are in 11 column ACCLAIM format and good data exist for May 1995 to May 1996
in channels:
Channel 6 QT3 (temperature deg C)
7 DQ35126 (pressure mbar) two digiquartz sensors used
8 DQ41083 (pressure mbar) .. .. .. ..
1st valid scan = Record No 25
Last valid scan = Record No 35472
Pressure data exists after record 35472 but it looks like the batteries
began to run out, although some of the later data look OK.
The temperature channel has a much longer series if required.
Lat 31 59.95S Long 36 00.7W Depth 2604m
May 1995 to May 1996
Channel 6 QT3
7 DQ35126
8 DQ41083
1st valid scan = Record No 25
Last valid scan = Record No 35472
Pressure data exists after record 35472 but it looks like the
batteries are running out. SOme of this later data looks OK
Channel 7 has pressures to record 43114
8 record 42235
The temperature channel has a much lomger series stored in alternative
file /users/imv/data/brazil97/brazil56t.datp
Drift is small enough to be ignored
Timing has been corrected.
=========================================================================
Station PAVASAS
===============
This record stems from a short deployment of a POL 'Mark 1' BPR by the
Instituto Oceanografico of the University of Sao Paulo in 1987. PAVASAS
stands for 'Pontos Anfidromicos e Variacoes Sazonais no Atlantico Sul
(Amphidromic Points and Seasonal Variations in the South Atlantic)' which
is the IOUSP research project. The deployment was in 104m water on the
Brazilian shelf.
Data are in 11 column ACCLAIM format in channels:
Channel 6 Pressure (mbar) from a strain gauge sensor
Channel 7 Pressure (mbar) from a digiquartz sensor
(Temperature data are also available from original data files)
The data in channel 7 are to be preferred over channel 6. Constituents
from a tidal analysis of the data show good correspondence with the Texas
CSR3.0 model.
IOS MARK I - PAVASAS I
POSITION : 0 13.96 N 041 12.62 W
START TIME: 23/07/87 11:30:00 GMT
STOP TIME: 29/8/87 02:30 GMT
1759 OBSERVATIONS
TIME INTERVAL 0.5000193 H (based on 1795 scans)
=========================================================================
Stations in the Scotia Sea and Drake Passage
============================================
POL deployments in this area were first made in a section between the
Falkland Islands and Signy in the South Orkney islands. These stations
have names like 'FS1'. Recording then moved west to two deeper (4000 m)
stations on the western side of the Drake Passage ('ND1' and 'SD1'), and,
most recently, have been on a section between the Falklands and Elephant
Island along the official 'Drake Passage' hydrographic section for the
World Ocean Circulation Experiment ('ND2' and 'SD2' with the stations
including MYRTLE in between).
The nomenclature 'ND1' etc. follows that of
M.Meredith, 1995. On the temporal variability of the transport through
the Drake Passage. University of East Anglia Ph.D thesis. In other
publications, for example:
Woodworth, P.L., Vassie, J.M., Hughes, C.W. and Meredith, M.P. 1996.
A test of the ability of TOPEX/POSEIDON to monitor flows through
the Drake Passage. Journal of Geophysical Research, 101(C5), 11935-11947.
ND1 is referred to as DN92, SD1 as DS92, ND2 as DN93 and SD2 as DS93.
Most instruments were Paroscientific Digiquartz (DQ) pressure transducers
with temperature also recorded. BPR's had typically 3 sensors. Instrumental
drift has attempted to be removed from all records.
Station FS1 (Falkland-Signy Transect - Position 1 at the North)
===============================================================
file fs1.8889.acc:
this file is in 11 column ACCLAIM format with three pressure sensors in channels
8, 9 and 10 respectively. Units are mbar. Channels 9 and 10 may be used.
Channel 8 should not.
file fs1.8990.acc:
this file is in 11 column ACCLAIM format, use channels 9 or 10 (mbar).
file fs1.9092.acc:
this file is in 11 column ACCLAIM format. Use channel 8 and 10 (mbar).
From tidal analysis, data from this third deployment at FS1 appear to be
about 6 minutes too soon using semidiurnals (i.e. phase lags are about 3
degrees less) and correspondingly different values for diurnals. There may
well therefore be a systematic clock shift in this deployment.
Posn FS13
MK IV
STANLEY END
DEPLOYED 21-11-90 at 0305Z on seabed at 0348Z
DEPTH 2800 m
POSITION SAT 0250Z 53 30.7 S
56 58.8 W
ACOUSTICS 2517 320, 259, 1.16
2518 320, 278, 1.16
CH6 Temp
CH7 Temp ZT4
CH8 Pressure DQ 41097
CH9 Pressure DQ 41083
CH10 Pressure DQ 41079
1st Scan 00000 1500.00Z G.M.T. 21-11-90
Last Scan 39779 0001.56Z " 9-01-92
file fs1.9292.acc:
this file is in 11 column ACCLAIM format. Use channels 8 or 9 (mbar).
However, note
that a temperature sensor failed on this deployment, thus data for 21st
July 1992 onwards are not temperature-corrected and therefore not useable.
Also note the warnings about timings etc. at start of file - phases here
look about 3 degrees later compared to deployments 1 and 2, and there are
residual tidal signals. No instrumental drift has been removed from this
file as it seemed very small.
Scotia Sea Stanley end. Position FS14
12th January 1992 to 15th November 1992
53 31.4 S 57 01.9W Depth 2800mIDE GUAGE RECORDER
Channel 6 2T4
7 DQ 41097
8 DQ 41083
9 DQ 41079
Drift very small so not removed from pressures.
Hourly values in this file.
Raw data was originally corrupted due to tape fault
Reprocessed many times by DUS to produce the following file
Temperature has a high pre-division factor hence low resolution
3 pressure channels show good agrement
The temperature sensor fails from 21st July 1992 onwards. The records
after this date are therefore not temperature corrected. The
variability in the low frequency is noticeable higher so
treat this part of the record with caution
Tidal analysis shows M2 phase 3 degrees later than previous deployments
There is no indication of timing errors but a tidal residual is
evident of approx +- 5 mbar in all channels. READ INVENTORY FILE
Station FS2 (Falkland-Signy Transect - Position 2 in the Centre)
================================================================
file fs2.8889.acc:
this file is in 11 column ACCLAIM format. Use channels 8, 9 or 10 (mbar).
As well as the instrumental drift correction, a correction has been made
for what appears to be the gauge slipping to greater depth after record
1502 (day 30 1989).
BISCOE/ACC NOVEMBER 1988 TO NOVEMBER 1989
LONGITUDE : 52 32.26' W
LATITUDE : 56 41.97' S
DEPTH : 3150 METRES
1st SEABED SCAN AT 1
LAST SEABED SCAN AT 8375
TIDE GAUGE TYPE AND REFERENCE MKIV NO.4
HOURLY DATA WITH INSTRUMENTAL DRIFT REMOVED
DISCONTINUIITY DUE TO GAUGE SLIPPING TO A
GREATER DEPTH PRIOR TO RECORD 1502 HAS BEEN FIXED
BPR AT MIDDLE POSN OF 3 BETWEEN STANLEY & SIGNY
BPR TO THE SOUTH WAS NOT RECOVERED. FS1 IS THE
ASSOCIATED GAUGE TO THE NORTH.
CHAN 6 - 2T6
7 - DQ35126 USING MANUFACTURERS CALIBRATION.
8 - B&H 3
9 - DQ5997
10 - DQ 35126
file fs2.8990.acc:
this file is in 11 column ACCLAIM format. Use channel 9 (mbar).
Channel 8 fails on Day 217, 1990, probably due to a battery failure. This data
is however sufficently long to allow a 6 month analysis. Channels 9 and 10
worked for the whole period, allowing a 1 year analysis. M2 values are within
+/- 0.1 mbar and 0.1 deg from all three sensors.
BISCOE DATA LOGGER 5 - CENTRAL POSITION.
DATA FROM : 1989 DAY 312 AT 1300 HOURS
TO : 1990 DAY 332 AT 1330 HOURS
FIRST SEABED SCAN IS AT RECORD NO 1
YEAR 1989 DAY 316 AT 1915 HOURS.
CHANNEL 7 : TEMP 2T1
CHANNEL 8 : DQ2262
CHANNEL 9 : DQ5996
CHANNEL 10: DQ38173
paxe, 22 May 1998 (info from imv)
Station FS3 (Falkland-Signy Transect - Position 3 in the South)
===============================================================
FS3 is a deep BPR station north-west of Signy Island.
file fs3.8990.acc:
this file is in 11 column ACCLAIM format. Use channel 9 (mbar).
BISCOE DATA LOGGER 5 - CENTRAL POSITION.
SOUTHERN POSITION LOGGER NO.4
DEPLOYED 14 NOVEMBER 1989AT 1300 HOURS
RECOVERED 28 NOVEMBER 1990T 1330 HOURS
1st record from this site
CHANNEL 7 3T3 Sea Temperature
CHANNEL 8 B&H3 Total Pressure
CHANNEL 9 DQ 5997 " "
CHANNEL 10 DQ 35126 " "
CHANNEL 8 : DQ2262
FIRST SEABED SCAN IS RECORD 1
LAST SEABED SCAN IS RECORD 9008
Chan 8 no data after record 5000
Chan 9 no data before record 1189
SAMPLING INTERVAL 1 hour.
file fs3.9092.acc:
this file is in 11 column ACCLAIM format. Use channel 8 or 10 (mbar).
Posn FS33 drift free data
MK IV LOGGER No.6
SIGNY END
DEPLOYED 24-11-90 at 2134Z on seabed at 2208Z
DEPTH 2010 m
POSITION SAT 2119Z 60 03.1 S
47 05.1 W
ACOUSTICS 2477 320, 241, 1.16
2478 321, 361, 1.16
CH6 Temp
CH7 Temp 3T1
CH8 Pressure DQ 18567
CH9 Pressure DQ 36573 : Batteries run down mid Dec 91
CH10 Pressure DQ 38175
Calibrations in BISC CAL:9 A1
1st Scan 00000 1515.00Z 23-11-90
Last Scan 39351 1301.52Z 7-01-92
file fs3.9292.acc:
this file is in 11 column ACCLAIM format. Use channel 9 or 10 (mbar).
This file was updated by Philip Axe on 22 May 1998. 15 minutes was added
to the timing of each scan, as the originals were 15 minutes too early.
When the data was processed, the scan numbers did not tie up with the start
and end of the record, and field deployment notes weren't available at that
time. The correct timing was found as the sensors were unplugged at sea, and
this time is identifiable in the record. For this 15 minute correction to
be correct, we must accept that the scan counter did not increment by 1 at
the beginning of the record. This has happened before, and so we are
confident of the corrected timings.
Scotia Sea - Signy end (logger no. 6)
Original file name imv4
4th deployment at FS3 - FS3492
First scan - 7/1/92 14:15:00Z
Last scan - 23/11/92 20:16:26:Z (scan no. 30840)
Channel 6 - Temperature Sensor ?
Channel 7 - Temperature sensor 3T1 (degrees C)
Channel 8 - Pressure sensor Digiquartz DQ18567 (+240000 Mbars)
Channel 9 - Pressure sensor Digiquartz DQ36573 (+240000 Mbars)
Channel 10 - Pressure sensor Digiquartz DQ38175 (+240000 Mbars)
**** Read the INVENTORY file for notes about this data ****
15 minutes has been added to each scan time (22 May 1998, paxe). This
was because there was uncertainty at the time of processing between the
scan numbers and the start and end of the record. This 15 minute
correction should have resolved this problem. If there are any problems
please contact POL.
If you have any queries, please contact imv@pol.ac.uk, plw@pol.ac.uk,
rsp@pol.ac.uk or paxe@pol.ac.uk
Position ND1
============
file nd1.9192: 11 column ACCLAIM format, use channels 8, 9 or 10 (mbar)
Drake North
data reformatted to reverse temperature channels because there was drift in QIT3
Channel 6 QIT3
" 7 QT1 add 0.7 C to this channel
" 8 DQ 43122
9 DQ 40190
10 QT 119016
Position SD1
============
file sd1.9192: 11 column ACCLAIM format, use channels 8, 9 or 10 (mbar)
--------------
DRAKE PASSAGE SOUTH
RECOVERED NOV 1992
POSITION DP292 FROM TAPE IMV2.ASC
First sea bed scan - 451 - day 357 1991, 17.125 hrs
Last sea bed scan - 31157 - day 312 1992, 13.670 hrs
Channel 6 - Temperature ?
Channel 7 - Temerature QT2
" 8 - Digiquartz pressure sensor DQ43126
" 9 - " " " DQ41086
" 10 - " " " DQ38173
Position ND2
============
file nd2.9293: 11 column ACCLAIM format, use channels 9 or 10 (mbar)
--------------
TAPE START 13:15:00Z 9/11/92 1
LAST SCAN 18:46:40Z 22/11/93 36310
file nd2.9394: 11 column ACCLAIM format, use channel 8 (mbar)
--------------
Drake Passage North day 324 1993 to day 318 1994
Only records when instrument on sea bed included
Linear drift in pressure channels removed
Channel 6 - Temperature sensor QT3 (Degrees C)
Channel 7 - Pressure sensor DQ41086 (Millibars) offset -104910.64
Channel 8 - Pressure sensor DQ41083 (Millibars) offset -104762.52
Channel 9 - Pressure sensor QD29366D (Millibars) offset -104852.65
Channel 10 - Blank
Record 1 - 22/11/93 day 326
Record 8608 - 15/11/94 day 319
Clock drift averaged over the whole record
Pressure channels have been corrected for temperature and temp
derivative based on program respwt-t1.f
Data Sample Rate Reduced to hourly
file nd2.9394: 11 column ACCLAIM format, use channel 8 (mbar)
--------------
Position SD2
============
file sd2.9293: 11 column ACCLAIM format, use channel 8 (mbar)
--------------
DRAKE SOUTH 92-3 Burdwood Bank to elephant Island.
RECOVERED NOVEMBER 1993
DATA CHANNEL 1 QT1 TEMPERATURE SENSOR
" " 2 QIT3 " "
" " 3 DQ43122 DIGIQUARTZ PRESSURE SENSOR
" " 4 no Quartzdyne DQ40375 in this file
Depth 1020m
60 50.99S 54 42.88W
Drift free data Record 1 to 9073
file sd2.9394: 11 column ACCLAIM format, use channel 8 (mbar)
--------------
Drake Passage South day 330 1993 to day 325 1994
Only records when instrument on sea bed included
Linear drift removed from pressure channels
Channel 6 - Temperature sensor QT4 (Degrees C)
Channel 7 - Pressure sensor DQ40375 (Millibars) offset -105659.98
Channel 8 - Pressure sensor DQ41077 (Millibars) offset -105456.32
Channel 9 - Blank
Channel 10 - Blank
Record 1 - 27/11/94 day 331
Record - 8620 21/11/94 day 325
Clock drift averaged over ther whole record
Pressure channels have been corrected for temperature and temp
derivative based on program respwt-t1.f
Sample rate reduced to hourly
=========================================================================
Drake Passage Recoveries December 1996 (North to South)
=======================================================
Position ND2
============
file dpn9496a.a4d: New 11 column ACCLAIM format, use pressures in data channel 6 (mbar)
Because of its length, the batteries ran out shortly before it was recovered
and so there was no end time to check clock drift against. The instrument was
redeployed 1996-1997 and so this data was re-processed using the next year's
drift. The timings had some uncertainty in them, as the only available
deployment time was 'time on the bottom', and this was a bit uncertain. As a
result of harmonic analysis, and user queries, we have ADDED 15 MINUTES to
the original timings.
Drake Passage North 1994-96
Instrument SSDL No3
Deployed at Position POL8 in November 1994
Recovered November 1996
54 56.65s 58 23.11w 1052m delt= 15.0000853 min
3 Digiquartz pressure with in build temperature sensors
Initial scan at 1930Z 11/11/96 Day 315 Pressure time at 1922
Mean and Drift removed 15 April '97 Katie
Channel 1 Temperature from DQ44935 Deg C
2 Pressure from DQ44935 mBar
Channel 3 Temperature from DQ46267 Deg C
4 Pressure from DQ46267 mBar
Channel 5 Temperature from DQ52026 Deg C
6 Pressure from DQ52026 mBar
1st Seabed Record = 1 (Corresponds to Record 441 in original
Last Seabed Record = 70027
data Channel 6 contains the best record.
15 minutes added to timings. 22 May 1998 paxe@pol.ac.uk
Position NNS
============
file dpnns956.i4d: New 11 column ACCLAIM format, use pressures in data channel 2 (mbar)
This BPR consists of a single podule deployed by Geoff Hargreaves and Chris Hughes
in November 1995.
Drake Passage North North South: Deployed November 1995 Recovered November 1996
Depth = 2096m Position = 56 50.15S 57 30.09W
First sea bed scan is original record 217 = 1
Last sea bed scan is original record 34512 = 34296
Time base 42 seconds late delt= 15.0000202 min
Channel 1 Temperature from DQ41077
2 Pressure from DQ41077
The drift and mean have been removed from the pressure channel
using polyorder 2
Position CD
===========
file dpc9496a.i4d: New 11 column ACCLAIM format, use pressures in data channel 2 (mbar)
Channel 6 (column 11) temp and press records after record 58000 thought to be corrupt.
Channel 6 (column 11) press records are zero after 58000. Drift and mean taken out of
pressure channels. Channel 2 contains the best pressure record
Deployed November 1994 Recovered November 1996
Depth = 3776m
Position = 58 21.76S 56 21.28W
First sea bed scan is original record 683,now = 1
Last sea bed scan is original record 70810,now = 70128
Time base early delt= 14.99998706 min
Channel 1 Temperature from QT119016
2 Pressure from QT119016
Channel 3 Temperature from DQ38173
4 Pressure from DQ38173
Channel 5 Temperature from DQ46279
6 Pressure from DQ46279
Position Myrtle
===============
file myr9296.a1d: New 11 column ACCLAIM format, use pressures in data channel 4 (mbar)
from the Quarztronic sensor which stops working near to the end of the record.
Data channel 3 contains pressures from a Digiquartz throughout the record
(mbar) but exhibits a large drop in pressure at the start of the record.
Otherwise the two are very similar.
Channel 1 QIT6
2 QIT1
3 DQ43118
4 QT109972
Depth 3690m 59-43.69S 55 29.50W
1st record = 1 corresponds to scan 117 in raw data
1st seabed = record 1
last seabed = record 35211
No data from Channel 4 after Record 32724 1996 Day 221 0100Z
April 21 : drift removed from the pressure channels
using polyorder 2 (best fit to second press. channel)
April 21 :data at record nos. 22507 22638 22738 22741 22774 has been further
interpolated to remove spikes
Position SD2
============
file dps9496.i4d: New 11 column ACCLAIM format, use pressures in data channel 4 (mbar).
Data channel 6 is very similar but slightly noisier, data channel 2 should
not be used.
Deployed November 1994 Recovered November 1996
Depth = 1040m Position = 60 51.01S 54 43.01W
First sea bed scan is original record 922 = 1
Last sea bed scan is original record 71025 = 70104
Time base 139 seconds late delt= 15.00003256 min
Channel 1 Temperature from QT49187
2 Pressure from QT49187
Channel 3 Temperature from DQ46251
4 Pressure from DQ46251
Channel 5 Temperature from DQ43513
6 Pressure from DQ43513
April '97 Drift and mean removed from pressure channels
Data Channel 4 is the best of the 3 pressure channels
======================================================================================
Drake Passage Recoveries December 1997 (North to South)
=======================================================
Position ND2
============
file dpn9697.a4d: File is in 11 column ACCLAIM format. Temperatures are in deg C in
column 6 (channel 1) and demeaned, detrended pressures (in mbar) are in column 7
(channel 2). The original data had an extra 4 channels from digiquartz sensors, but
these were removed as the data was corrupted, possibly by water leaking into the
modules.
Drake Passage North (Pol 8). Deployed December 1996 Recovered 1997
Depth = 1050 m /1077 m Position = 54 56.64S 58 23.02W
First sea bed scan is original record 996 = 1
Last sea bed scan is original record 37499 = 36504
Time base 83 secs late delt= 15.00003684
Channel 1 Temperature from QT49187
2 Pressure from QT49187
The other two sensors DQ46251 and DQ43513 produced corrupt raw data.
Drift and mean removed from channel 2 using a linear drift.
Position SD2
============
file dps9697.a4d: File is in 11 column ACCLAIM format. Temperatures are in deg C, in
columns 6,8 and 10, while pressure from the digiquartz sensors is in columns 7, 9 and
11. Pressure data has been de-meaned and detrended, and is in mbar.
Channel 1 Temperature from DQ44935
2 Pressure from DQ44935
3 Temperature from DQ46267
4 Pressure from DQ46267
5 Temperature from DQ52026
6 Pressure from DQ52026
Deployed November 1996 Recovered December 1997
Depth = 1170m Position 60 50.96S 54 43.36W
First sea bed scan is original record 69 =1
Last sea bed scan is original record 38928 = 38860
Time base 63 secs late delt= 15.00002695
Drift and mean removed from pressure channels using a linear drift
using filter_drift.m