Contributors | Affiliation | Role |
---|---|---|
Costa, Daniel P. | University of California-San Diego (UCSD) | Principal Investigator |
Torres, Joseph J. | University of South Florida (USF) | Principal Investigator |
Wiebe, Peter H. | Woods Hole Oceanographic Institution (WHOI) | Principal Investigator |
Copley, Nancy | Woods Hole Oceanographic Institution (WHOI) | Technician |
Note: Some variables have been eliminated from the display but are nevertheless available. These variables include: oxycurrent, oxytemp, tempco, and echo.
The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). The particular MOCNESS system from which these CTD data came is one of two net systems. The MOCNESS-1 has nine rectangular nets (1m x 1.4 m) which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe et al., 1976). In both systems, "the underwater unit sends a data frame, comprised of temperature, depth, conductivity, net-frame angle, flow count, time, number of open net, and net opening/closing, to the deck unit in a compressed hexadecimal format every 2 seconds and from the deck unit to a microcomputer every 4 seconds... Temperature (to approximately 0.01 deg C) and conductivity are measured with SEABIRD sensors.
Normally, a modified T.S.K.-flowmeter is used... Both the temperature and conductivity sensors and the flow meter are mounted on top of the frame so that they face horizontally when the frame is at a towing angle of 45deg... Calculations of salinity (to approximately 0.01 o/oo S), potential temperature (theta), potential density (sigma), the oblique and vertical velocities of the net, and the approximate volume filtered by each net are made after each string of data has been received by the computer." (Wiebe et al., 1985)
In addition, data were collected from four other sensors attached to the frame: the Transmissometer, the Fluorometer, the Down welling light sensor, and the Oxygen sensor. A SeaBird underwater pump was also included in the sensor suite.
It should be noted that due to Antarctic cold, the first few minutes of data are often of questionable value as they are extremely variable and have a high frequency of "50.000" (indicating "bad values") in the temp, theta and sal fields. Once the sensors encounter deeper, warmer water, they start recording good values.
For additional information, contact the chief scientist for the cruise.
Fofonoff and Millard, 1983, UNESCO technical papers in Marine Sciences, #44
Tucker, G.H., 1951. Relation of fishes and other organisms to the scattering of underwater sound. Journal of Marine Research, 10: 215-238.
Wiebe, P.H., K.H. Burt, S. H. Boyd, A.W. Morton, 1976. The multiple opening/closing net and environmental sensing system for sampling zooplankton. Journal of Marine Research, 34(3): 313-326
Wiebe, P.H., A.W. Morton, A.M. Bradley, R.H. Backus, J.E. Craddock, V. Barber, T.J. Cowles and G.R. Flierl, 1985. New developments in the MOCNESS, an apparatus for sampling zooplankton and micronekton. Marine Biology, 87: 313-323.
last updated January 10, 2006; gfh
The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). The particular MOCNESS system from which these CTD data came is one of two net systems. The MOCNESS-1 has nine rectangular nets (1m x 1.4 m) which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe et al., 1976). The MOCNESS-10 (with 10 m2 nets)carries 6 nets of 3.0-mm circular mesh. In both systems, 'the underwater unit sends a data frame, comprised of temperature, depth, conductivity, net-frame angle, flow count, time, number of open net, and net opening/closing, to the deck unit in a compressed hexadecimal format every 2 seconds and from the deck unit to a microcomputer every 4 seconds... Temperature (to approximately 0.01 deg C) and conductivity are measured with SEABIRD sensors. Normally, a modified T.S.K.-flowmeter is used... Both the temperature and conductivity sensors and the flow meter are mounted on top of the frame so that they face horizontally when the frame is at a towing angle of 45deg... Calculations of salinity (to approximately 0.01 o/oo S), potential temperature (theta), potential density (sigma), the oblique and vertical velocities of the net, and the approximate volume filtered by each net are made after each string of data has been received by the computer.' (Wiebe et al., 1985) In addition, data were collected from four other sensors attached to the frame: the Transmissometer, the Fluorometer, the Down welling light sensor, and the Oxygen sensor. A SeaBird underwater pump was also included in the sensor suite.
It should be noted that due to Antarctic cold, the first few minutes of data are often of questionable value as they are extremely variable and have a high frequency of '50.000' (indicating 'bad values') in the temp, theta and sal fields. Once the sensors encounter deeper, warmer water, they start recording good values.
For additional information, contact the chief scientist for the cruise.
File |
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mocness_ctd.csv (Comma Separated Values (.csv), 35.95 MB) MD5:dff00f9e9c27ef6719520efb67eb25fe Primary data file for dataset ID 2515 |
mocness_ctd_LMG0104.csv (Comma Separated Values (.csv), 4.45 MB) MD5:20bc1e5885e9112e83e3c19976e8dbbc Displayed by /data/rgroman/ctd_so_mocness/mocpro_level1.pl, V2.07so/October 3, 2001 For MOC1 data, with filetype=pro Displayed by /data/rgroman/ctd_so_mocness/mocpro_level2.pl, V2.13so/May 17, 2004 For /data12/sodata/lmg0104/moc, MOC1, pro, LMG0104, 2001 Displayed by /data/rgroman/ctd_so_mocness/mocpro_level3.pl, V1.51/January 28, 2000 Using data file /data12/sodata/lmg0104/moc/M01_01.PRO Tow: M-01-001 LMG0104 Date: 01 May 2001 Temperature Probe # 2686 Conductivity Probe # 2250 Pressure Probe # 149 Oxygen Probe # 1 Transmissometer # 439 Fluorometer # 1 |
mocness_ctd_LMG0106.csv (Comma Separated Values (.csv), 1.52 MB) MD5:12403c102a68ddfc6875d520806e7a99 Displayed by /data/rgroman/ctd_so_mocness/mocpro_level1.pl, V2.07so/October 3, 2001 For MOC1 data, with filetype=pro Displayed by /data/rgroman/ctd_so_mocness/mocpro_level2.pl, V2.13so/May 17, 2004 For /data12/sodata/lmg0104/moc, MOC1, pro, LMG0104, 2001 Displayed by /data/rgroman/ctd_so_mocness/mocpro_level3.pl, V1.51/January 28, 2000 Using data file /data12/sodata/lmg0104/moc/M01_01.PRO Tow: M-01-001 LMG0104 Date: 01 May 2001 Temperature Probe # 2686 Conductivity Probe # 2250 Pressure Probe # 149 Oxygen Probe # 1 Transmissometer # 439 Fluorometer # 1 |
mocness_ctd_LMG0203.csv (Comma Separated Values (.csv), 4.76 MB) MD5:a6121a1a84d32d872daae3882085c5f0 Displayed by /data/rgroman/ctd_so_mocness/mocpro_level1.pl, V2.07so/October 3, 2001 For MOC1 data, with filetype=pro Displayed by /data/rgroman/ctd_so_mocness/mocpro_level2.pl, V2.13so/May 17, 2004 For /data12/sodata/lmg0104/moc, MOC1, pro, LMG0104, 2001 Displayed by /data/rgroman/ctd_so_mocness/mocpro_level3.pl, V1.51/January 28, 2000 Using data file /data12/sodata/lmg0104/moc/M01_01.PRO Tow: M-01-001 LMG0104 Date: 01 May 2001 Temperature Probe # 2686 Conductivity Probe # 2250 Pressure Probe # 149 Oxygen Probe # 1 Transmissometer # 439 Fluorometer # 1 |
mocness_ctd_NBP0103.csv (Comma Separated Values (.csv), 7.19 MB) MD5:e583ccf0915ecf824ad8e7c173c7abb7 Displayed by /data/rgroman/ctd_so_mocness/mocpro_level1.pl, V2.07so/October 3, 2001 For MOC1 data, with filetype=pro Displayed by /data/rgroman/ctd_so_mocness/mocpro_level2.pl, V2.13so/May 17, 2004 For /data12/sodata/lmg0104/moc, MOC1, pro, LMG0104, 2001 Displayed by /data/rgroman/ctd_so_mocness/mocpro_level3.pl, V1.51/January 28, 2000 Using data file /data12/sodata/lmg0104/moc/M01_01.PRO Tow: M-01-001 LMG0104 Date: 01 May 2001 Temperature Probe # 2686 Conductivity Probe # 2250 Pressure Probe # 149 Oxygen Probe # 1 Transmissometer # 439 Fluorometer # 1 |
mocness_ctd_NBP0104.csv (Comma Separated Values (.csv), 4.40 MB) MD5:d0c9483286a2f563736a68a69ca1e149 Displayed by /data/rgroman/ctd_so_mocness/mocpro_level1.pl, V2.07so/October 3, 2001 For MOC1 data, with filetype=pro Displayed by /data/rgroman/ctd_so_mocness/mocpro_level2.pl, V2.13so/May 17, 2004 For /data12/sodata/lmg0104/moc, MOC1, pro, LMG0104, 2001 Displayed by /data/rgroman/ctd_so_mocness/mocpro_level3.pl, V1.51/January 28, 2000 Using data file /data12/sodata/lmg0104/moc/M01_01.PRO Tow: M-01-001 LMG0104 Date: 01 May 2001 Temperature Probe # 2686 Conductivity Probe # 2250 Pressure Probe # 149 Oxygen Probe # 1 Transmissometer # 439 Fluorometer # 1 |
mocness_ctd_NBP0202.csv (Comma Separated Values (.csv), 7.87 MB) MD5:33321a3a3244739f64988e801e9f9928 Displayed by /data/rgroman/ctd_so_mocness/mocpro_level1.pl, V2.07so/October 3, 2001 For MOC1 data, with filetype=pro Displayed by /data/rgroman/ctd_so_mocness/mocpro_level2.pl, V2.13so/May 17, 2004 For /data12/sodata/lmg0104/moc, MOC1, pro, LMG0104, 2001 Displayed by /data/rgroman/ctd_so_mocness/mocpro_level3.pl, V1.51/January 28, 2000 Using data file /data12/sodata/lmg0104/moc/M01_01.PRO Tow: M-01-001 LMG0104 Date: 01 May 2001 Temperature Probe # 2686 Conductivity Probe # 2250 Pressure Probe # 149 Oxygen Probe # 1 Transmissometer # 439 Fluorometer # 1 |
mocness_ctd_NBP0204.csv (Comma Separated Values (.csv), 5.77 MB) MD5:92c6d581f355eb998af3070ca859179e Displayed by /data/rgroman/ctd_so_mocness/mocpro_level1.pl, V2.07so/October 3, 2001 For MOC1 data, with filetype=pro Displayed by /data/rgroman/ctd_so_mocness/mocpro_level2.pl, V2.13so/May 17, 2004 For /data12/sodata/lmg0104/moc, MOC1, pro, LMG0104, 2001 Displayed by /data/rgroman/ctd_so_mocness/mocpro_level3.pl, V1.51/January 28, 2000 Using data file /data12/sodata/lmg0104/moc/M01_01.PRO Tow: M-01-001 LMG0104 Date: 01 May 2001 Temperature Probe # 2686 Conductivity Probe # 2250 Pressure Probe # 149 Oxygen Probe # 1 Transmissometer # 439 Fluorometer # 1 |
Parameter | Description | Units |
cruiseid | cruise identification, e.g. NBP0202, for RVIB Palmer cruise 0202 | |
temp | temperature of water | degrees C |
datatype | sampling method - instrument type, e.g. MOCNESS-1 or MOCNESS-10 | |
year | year | |
brief_desc | brief cruise description, such as process or mooring | |
tow | tow number | |
day_gmt | day of month, GMT, 1-31 | |
month_gmt | month of year, GMT, 1 - 12 | |
station | station number, from event log | |
station_std | standard station number, from event log | |
yrday_gmt | year day as a decimal, based on Julian calendar, GMT | YYY.Y |
time_gmt | time, GMT using 24 hour clock to decimal minutes | HHmm.m |
press | depth of observation or sample | meters |
potemp | potential temperature or theta1 ¹Fofonoff and Millard, 1983, UNESCO technical papers in Marine Sciences, #44 | |
sal | salinity calculated from conductivity, bad values are set to 50 | |
sigma_0 | potential density1 ¹Fofonoff and Millard, 1983, UNESCO technical papers in Marine Sciences, #44 | |
flvolt | relative fluorescence (0-5 volts) | volts |
angle | angle of net frame relative to vertical (0-89 degrees) | degrees |
flow | consecutive flow counts | |
hzvel | horizontal net velocity | m/min |
vtvel | vertical net velocity | m/min |
vol_filt | volume filtered | meters<sup>3</sup> |
trans_v | transmissometry or light transmission, (0-5 volts) | volts |
o2 | dissolved oxygen | ml/liter |
lite | downwelling light | volts |
net | MOCNESS net number, (00-08) | |
lat | latitude, negative = South | DD.D |
lon | longitude, negative = West | DDD.D |
Dataset-specific Instrument Name | Conductivity, Temperature, Depth |
Generic Instrument Name | CTD - profiler |
Generic Instrument Description | The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast.
This term applies to profiling CTDs. For fixed CTDs, see https://www.bco-dmo.org/instrument/869934. |
Dataset-specific Instrument Name | CTD MOCNESS |
Generic Instrument Name | CTD MOCNESS |
Generic Instrument Description | The CTD part of the MOCNESS includes 1) a pressure (depth) sensor which is a thermally isolated titanium strain gauge with a standard range of 0-5000 decibars full scale, 2) A Sea Bird temperature sensor whose frequency output is measured and sent to the surface for logging and conversion to temperature by the software in the MOCNESS computer (The system allows better than 1 milli-degree resolution at 10 Hz sampling rate), and 3) A Sea Bird conductivity sensor whose output frequency is measured and sent to the surface for logging and conversion to conductivity by the software in the computer (The system allows better than 1 micro mho/cm at 10 Hz sampling rate). The data rate depends on the speed of the computer and the quality of the cable. With a good cable, the system can operate at 2400 baud, sampling all variables at 2 times per second. One sample every 4 seconds is the default, although the hardware can operate much faster. (From The MOCNESS Manual) |
Website | |
Platform | ARSV Laurence M. Gould |
Report | |
Start Date | 2001-04-20 |
End Date | 2001-06-05 |
Description | Methods & Sampling The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). The particular MOCNESS system from which these CTD data came is one of two net systems. The MOCNESS-1 has nine rectangular nets (1m x 1.4 m) which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe et al., 1976). The MOCNESS-10 (with 10 m2 nets)carries 6 nets of 3.0-mm circular mesh. In both systems, 'the underwater unit sends a data frame, comprised of temperature, depth, conductivity, net-frame angle, flow count, time, number of open net, and net opening/closing, to the deck unit in a compressed hexadecimal format every 2 seconds and from the deck unit to a microcomputer every 4 seconds... Temperature (to approximately 0.01 deg C) and conductivity are measured with SEABIRD sensors. Normally, a modified T.S.K.-flowmeter is used... Both the temperature and conductivity sensors and the flow meter are mounted on top of the frame so that they face horizontally when the frame is at a towing angle of 45deg... Calculations of salinity (to approximately 0.01 o/oo S), potential temperature (theta), potential density (sigma), the oblique and vertical velocities of the net, and the approximate volume filtered by each net are made after each string of data has been received by the computer.' (Wiebe et al., 1985) In addition, data were collected from four other sensors attached to the frame: the Transmissometer, the Fluorometer, the Down welling light sensor, and the Oxygen sensor. A SeaBird underwater pump was also included in the sensor suite. Processing Description It should be noted that due to Antarctic cold, the first few minutes of data are often of questionable value as they are extremely variable and have a high frequency of '50.000' (indicating 'bad values') in the temp, theta and sal fields. Once the sensors encounter deeper, warmer water, they start recording good values. For additional information, contact the chief scientist for the cruise. |
Website | |
Platform | ARSV Laurence M. Gould |
Report | |
Start Date | 2001-07-21 |
End Date | 2001-09-01 |
Description | Methods & Sampling The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). The particular MOCNESS system from which these CTD data came is one of two net systems. The MOCNESS-1 has nine rectangular nets (1m x 1.4 m) which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe et al., 1976). The MOCNESS-10 (with 10 m2 nets)carries 6 nets of 3.0-mm circular mesh. In both systems, 'the underwater unit sends a data frame, comprised of temperature, depth, conductivity, net-frame angle, flow count, time, number of open net, and net opening/closing, to the deck unit in a compressed hexadecimal format every 2 seconds and from the deck unit to a microcomputer every 4 seconds... Temperature (to approximately 0.01 deg C) and conductivity are measured with SEABIRD sensors. Normally, a modified T.S.K.-flowmeter is used... Both the temperature and conductivity sensors and the flow meter are mounted on top of the frame so that they face horizontally when the frame is at a towing angle of 45deg... Calculations of salinity (to approximately 0.01 o/oo S), potential temperature (theta), potential density (sigma), the oblique and vertical velocities of the net, and the approximate volume filtered by each net are made after each string of data has been received by the computer.' (Wiebe et al., 1985) In addition, data were collected from four other sensors attached to the frame: the Transmissometer, the Fluorometer, the Down welling light sensor, and the Oxygen sensor. A SeaBird underwater pump was also included in the sensor suite. Processing Description It should be noted that due to Antarctic cold, the first few minutes of data are often of questionable value as they are extremely variable and have a high frequency of '50.000' (indicating 'bad values') in the temp, theta and sal fields. Once the sensors encounter deeper, warmer water, they start recording good values. For additional information, contact the chief scientist for the cruise. |
Website | |
Platform | ARSV Laurence M. Gould |
Report | |
Start Date | 2002-04-07 |
End Date | 2002-05-20 |
Description | Methods & Sampling The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). The particular MOCNESS system from which these CTD data came is one of two net systems. The MOCNESS-1 has nine rectangular nets (1m x 1.4 m) which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe et al., 1976). The MOCNESS-10 (with 10 m2 nets)carries 6 nets of 3.0-mm circular mesh. In both systems, 'the underwater unit sends a data frame, comprised of temperature, depth, conductivity, net-frame angle, flow count, time, number of open net, and net opening/closing, to the deck unit in a compressed hexadecimal format every 2 seconds and from the deck unit to a microcomputer every 4 seconds... Temperature (to approximately 0.01 deg C) and conductivity are measured with SEABIRD sensors. Normally, a modified T.S.K.-flowmeter is used... Both the temperature and conductivity sensors and the flow meter are mounted on top of the frame so that they face horizontally when the frame is at a towing angle of 45deg... Calculations of salinity (to approximately 0.01 o/oo S), potential temperature (theta), potential density (sigma), the oblique and vertical velocities of the net, and the approximate volume filtered by each net are made after each string of data has been received by the computer.' (Wiebe et al., 1985) In addition, data were collected from four other sensors attached to the frame: the Transmissometer, the Fluorometer, the Down welling light sensor, and the Oxygen sensor. A SeaBird underwater pump was also included in the sensor suite. Processing Description It should be noted that due to Antarctic cold, the first few minutes of data are often of questionable value as they are extremely variable and have a high frequency of '50.000' (indicating 'bad values') in the temp, theta and sal fields. Once the sensors encounter deeper, warmer water, they start recording good values. For additional information, contact the chief scientist for the cruise. |
Website | |
Platform | RVIB Nathaniel B. Palmer |
Report | |
Start Date | 2001-04-24 |
End Date | 2001-06-05 |
Description | Methods & Sampling The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). The particular MOCNESS system from which these CTD data came is one of two net systems. The MOCNESS-1 has nine rectangular nets (1m x 1.4 m) which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe et al., 1976). The MOCNESS-10 (with 10 m2 nets)carries 6 nets of 3.0-mm circular mesh. In both systems, 'the underwater unit sends a data frame, comprised of temperature, depth, conductivity, net-frame angle, flow count, time, number of open net, and net opening/closing, to the deck unit in a compressed hexadecimal format every 2 seconds and from the deck unit to a microcomputer every 4 seconds... Temperature (to approximately 0.01 deg C) and conductivity are measured with SEABIRD sensors. Normally, a modified T.S.K.-flowmeter is used... Both the temperature and conductivity sensors and the flow meter are mounted on top of the frame so that they face horizontally when the frame is at a towing angle of 45deg... Calculations of salinity (to approximately 0.01 o/oo S), potential temperature (theta), potential density (sigma), the oblique and vertical velocities of the net, and the approximate volume filtered by each net are made after each string of data has been received by the computer.' (Wiebe et al., 1985) In addition, data were collected from four other sensors attached to the frame: the Transmissometer, the Fluorometer, the Down welling light sensor, and the Oxygen sensor. A SeaBird underwater pump was also included in the sensor suite. Processing Description It should be noted that due to Antarctic cold, the first few minutes of data are often of questionable value as they are extremely variable and have a high frequency of '50.000' (indicating 'bad values') in the temp, theta and sal fields. Once the sensors encounter deeper, warmer water, they start recording good values. For additional information, contact the chief scientist for the cruise. |
Website | |
Platform | RVIB Nathaniel B. Palmer |
Report | |
Start Date | 2001-07-22 |
End Date | 2001-08-31 |
Description | Methods & Sampling The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). The particular MOCNESS system from which these CTD data came is one of two net systems. The MOCNESS-1 has nine rectangular nets (1m x 1.4 m) which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe et al., 1976). The MOCNESS-10 (with 10 m2 nets)carries 6 nets of 3.0-mm circular mesh. In both systems, 'the underwater unit sends a data frame, comprised of temperature, depth, conductivity, net-frame angle, flow count, time, number of open net, and net opening/closing, to the deck unit in a compressed hexadecimal format every 2 seconds and from the deck unit to a microcomputer every 4 seconds... Temperature (to approximately 0.01 deg C) and conductivity are measured with SEABIRD sensors. Normally, a modified T.S.K.-flowmeter is used... Both the temperature and conductivity sensors and the flow meter are mounted on top of the frame so that they face horizontally when the frame is at a towing angle of 45deg... Calculations of salinity (to approximately 0.01 o/oo S), potential temperature (theta), potential density (sigma), the oblique and vertical velocities of the net, and the approximate volume filtered by each net are made after each string of data has been received by the computer.' (Wiebe et al., 1985) In addition, data were collected from four other sensors attached to the frame: the Transmissometer, the Fluorometer, the Down welling light sensor, and the Oxygen sensor. A SeaBird underwater pump was also included in the sensor suite. Processing Description It should be noted that due to Antarctic cold, the first few minutes of data are often of questionable value as they are extremely variable and have a high frequency of '50.000' (indicating 'bad values') in the temp, theta and sal fields. Once the sensors encounter deeper, warmer water, they start recording good values. For additional information, contact the chief scientist for the cruise. |
Website | |
Platform | RVIB Nathaniel B. Palmer |
Report | |
Start Date | 2002-04-09 |
End Date | 2002-05-21 |
Description | Methods & Sampling The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). The particular MOCNESS system from which these CTD data came is one of two net systems. The MOCNESS-1 has nine rectangular nets (1m x 1.4 m) which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe et al., 1976). The MOCNESS-10 (with 10 m2 nets)carries 6 nets of 3.0-mm circular mesh. In both systems, 'the underwater unit sends a data frame, comprised of temperature, depth, conductivity, net-frame angle, flow count, time, number of open net, and net opening/closing, to the deck unit in a compressed hexadecimal format every 2 seconds and from the deck unit to a microcomputer every 4 seconds... Temperature (to approximately 0.01 deg C) and conductivity are measured with SEABIRD sensors. Normally, a modified T.S.K.-flowmeter is used... Both the temperature and conductivity sensors and the flow meter are mounted on top of the frame so that they face horizontally when the frame is at a towing angle of 45deg... Calculations of salinity (to approximately 0.01 o/oo S), potential temperature (theta), potential density (sigma), the oblique and vertical velocities of the net, and the approximate volume filtered by each net are made after each string of data has been received by the computer.' (Wiebe et al., 1985) In addition, data were collected from four other sensors attached to the frame: the Transmissometer, the Fluorometer, the Down welling light sensor, and the Oxygen sensor. A SeaBird underwater pump was also included in the sensor suite. Processing Description It should be noted that due to Antarctic cold, the first few minutes of data are often of questionable value as they are extremely variable and have a high frequency of '50.000' (indicating 'bad values') in the temp, theta and sal fields. Once the sensors encounter deeper, warmer water, they start recording good values. For additional information, contact the chief scientist for the cruise. |
Website | |
Platform | RVIB Nathaniel B. Palmer |
Report | |
Start Date | 2002-07-31 |
End Date | 2002-09-18 |
Description | Also see NBP0204 Cruise Data Report Methods & Sampling The MOCNESS is based on the Tucker Trawl principle (Tucker, 1951). The particular MOCNESS system from which these CTD data came is one of two net systems. The MOCNESS-1 has nine rectangular nets (1m x 1.4 m) which are opened and closed sequentially by commands through conducting cable from the surface (Wiebe et al., 1976). The MOCNESS-10 (with 10 m2 nets)carries 6 nets of 3.0-mm circular mesh. In both systems, 'the underwater unit sends a data frame, comprised of temperature, depth, conductivity, net-frame angle, flow count, time, number of open net, and net opening/closing, to the deck unit in a compressed hexadecimal format every 2 seconds and from the deck unit to a microcomputer every 4 seconds... Temperature (to approximately 0.01 deg C) and conductivity are measured with SEABIRD sensors. Normally, a modified T.S.K.-flowmeter is used... Both the temperature and conductivity sensors and the flow meter are mounted on top of the frame so that they face horizontally when the frame is at a towing angle of 45deg... Calculations of salinity (to approximately 0.01 o/oo S), potential temperature (theta), potential density (sigma), the oblique and vertical velocities of the net, and the approximate volume filtered by each net are made after each string of data has been received by the computer.' (Wiebe et al., 1985) In addition, data were collected from four other sensors attached to the frame: the Transmissometer, the Fluorometer, the Down welling light sensor, and the Oxygen sensor. A SeaBird underwater pump was also included in the sensor suite. Processing Description It should be noted that due to Antarctic cold, the first few minutes of data are often of questionable value as they are extremely variable and have a high frequency of '50.000' (indicating 'bad values') in the temp, theta and sal fields. Once the sensors encounter deeper, warmer water, they start recording good values. For additional information, contact the chief scientist for the cruise. |
The fundamental objectives of United States Global Ocean Ecosystems Dynamics (U.S. GLOBEC) Program are dependent upon the cooperation of scientists from several disciplines. Physicists, biologists, and chemists must make use of data collected during U.S. GLOBEC field programs to further our understanding of the interplay of physics, biology, and chemistry. Our objectives require quantitative analysis of interdisciplinary data sets and, therefore, data must be exchanged between researchers. To extract the full scientific value, data must be made available to the scientific community on a timely basis.
U.S. GLOBEC (GLOBal ocean ECosystems dynamics) is a research program organized by oceanographers and fisheries scientists to address the question of how global climate change may affect the abundance and production of animals in the sea.
The U.S. GLOBEC Program currently had major research efforts underway in the Georges Bank / Northwest Atlantic Region, and the Northeast Pacific (with components in the California Current and in the Coastal Gulf of Alaska). U.S. GLOBEC was a major contributor to International GLOBEC efforts in the Southern Ocean and Western Antarctic Peninsula (WAP).
Funding Source | Award |
---|---|
NSF Antarctic Sciences (NSF ANT) |