Dataset: CTD_MOCNESS1

Name: CTD MOCNESS data including calibrated oxygen from R/V Thomas G. Thompson cruises TT043, TT045, TT050, TT054 in the Arabian Sea in 1995 (Arabian Sea project)
Published: 2015-04-10
Keywords: oceans

Cite This Dataset

Spatial Extent: N:22.7496 E:68.7549 S:9.9188 W:57.1973

Temporal Extent: 1995-01-12 - 1995-12-23

Project:

U.S. JGOFS Arabian Sea (Arabian Sea)

Program:

U.S. Joint Global Ocean Flux Study (U.S. JGOFS)

Principal Investigator:

Karen Wishner (University of Rhode Island, URI-GSO)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

10 April 2015

Version Date:

2015-04-10

Restricted:

Validated:

Current State:

Preliminary and in progress

CTD MOCNESS data including calibrated oxygen from R/V Thomas G. Thompson cruises TT043, TT045, TT050, TT054 in the Arabian Sea in 1995 (Arabian Sea project)

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Description

CTD MOCNESS data including calibrated oxygen from RV/Thompson cruises in the Arabian Sea during 1995. Samples were obtained during four seasonal cruises in 1995: the late Northeast Monsoon (LNEM) in January (TN043), the Spring Intermonsoon (SI) in March (TN045), the late Southwest Monsoon (LSWM) in August—September (TN050), and the early Northeast Monsoon (ENEM) in December (TN054).

Methods & Sampling

Extracted from Wishner et al. 1998; see below for full paper citation:
Mesozooplankton were collected with a double 1-m2 MOCNESS (two 1-m2 MOCNESS systems side-by-side), a multiple opening-closing net system with environmental sensors and control of the nets from shipboard. The nets were 153 um mesh with a 1-m2 mouth opening (when towed at a 45° angle). The net was towed usually at 1.5—2.5 kts behind the ship. Wire was payed out at 10—25 m/min and hauled in at 5—20 m/min. Electronic data from the MOCNESS included time, volume filtered, depth, temperature (Sea-Bird SBE 3), salinity (Sea-Bird SBE 4), light transmission (SeaTech 25 cm beam transmissometer), and oxygen (Sea-Bird SBE 13). In some cases, the volume filtered for time intervals with electronic problems was extrapolated from trouble-free portions of a tow. Typically, about 100—200 m3 of water were filtered for the shallow samples and 500—800 m3 for the deeper sparser OMZ samples. Usually, 16 discrete samples were collected in an oblique haul from 1000 m to the surface, with 100-m intervals at depth and 50 or 25 m intervals in the upper 400 m.

For oxygen methodology, refer to "Processing Arabian Sea MOCNESS Oxygen Data" (PDF).

Refer to related publications:
Wishner, K.F., M.M. Gowing, and C. Gelfman. 1998. Mesozooplankton biomass in the upper 1000 m in the Arabian Sea: overall seasonal and geographic patterns and relationship to oxygen gradients. Deep-Sea Research II 45:2405-2432. doi:10.1016/S0967-0645(98)00078-2

Gowing, M.M. and K.F. Wishner. 1998. Feeding ecology of the copepod Lucicutia aff. L. grandis near the lower interface of the Arabian Sea oxygen minimum zone. Deep-Sea Research II 45:2433-2459. doi:10.1016/S0967-0645(98)00077-0

Smith, S. L., M. Roman, I. Prusova , K. Wishner, M. Gowing, L.A. Codispoti, R. Barber, J. Marra, and C. Flagg. 1998. Seasonal response of zooplankton to monsoonal reversals in the Arabian Sea. Deep-Sea Research II 45:2369-2403. doi:10.1016/S0967-0645(98)00075-7

Morrison, J.M., L.A. Codispoti, S. L. Smith, K. Wishner, C. Flagg, W.D. Gardner, S. Gaurin, S.W.A. Naqvi, V. Manghnani, L. Prosperie and J.S. Gundersen. 1999. The oxygen minimum zone in the Arabian Sea during 1995. Deep-Sea Research II 46:1903-1931. doi:10.1016/S0967-0645(99)00048-X

Roman, M., S. Smith, K. Wishner, X. Zhang and M. Gowing. 2000. Mesozooplankton production and grazing in the Arabian Sea. Deep-Sea Research II 47:1423-1415. doi:10.1016/S0967-0645(99)00149-6

Wishner, K. F., M. M. Gowing, and C. Gelfman. 2000. Living in suboxia: ecology of an Arabian Sea oxygen minimum zone copepod. Limnology and Oceanography 45:1576-1593. doi:10.4319/lo.2000.45.7.1576

Gowing, M. M. D. L. Garrison, K. F. Wishner, and C. Gelfman. 2003. Mesopelagic microplankton of the Arabian Sea. Deep-Sea Research I 50:1205-1234. doi:10.1016/S0967-0637(03)00130-4

Wishner, K. F., C. Gelfman, M. M. Gowing, D. M. Outram, M. Rapien, and R. L. Williams. 2008. Vertical zonation and distributions of calanoid copepods through the lower oxycline of the Arabian Sea Oxygen Minimum Zone. Progress in Oceanography 78:163-191. doi:10.1016/j.pocean.2008.03.001

Data Processing Description

QC: Some of the tows include erroneous surface data (i.e. times near the sea surface when the salinity sensor was probably out of the water). This results in negative density (sigma) values, which are not valid. The investigators didn’t use those values in their analyses.

BCO-DMO Processing:
- modified parameter names to conform with BCO-DMO naming conventions;
- replaced blanks (miss and "#VALUE!" with "nd" (no data);
- obtained dates from cruise event logs for submitted files missing dates.

Data Files

File
ctd_mocness.csv (Comma Separated Values (.csv), 10.35 MB) MD5:1afeea6662051c6df6ec497e2de6419f Primary data file for dataset ID 555763

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-9310591
NSF Division of Ocean Sciences	OCE-9310590
NSF Division of Ocean Sciences	OCE-0526502
NSF Division of Ocean Sciences	OCE-9310599
NSF Division of Ocean Sciences	OCE-9310577

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
TT043	TTN043 TN043 TTN-043	1995-01-08	R/V Thomas G. Thompson	Michael R. Roman (Chief Scientist)	data info
TT045	TTN045 TN045 TTN-045	1995-03-14	R/V Thomas G. Thompson	John F. Marra (Chief Scientist)	data info
TT050	TTN050 TN050 TTN-050	1995-08-18	R/V Thomas G. Thompson	Sharon L. Smith (Chief Scientist)	data info
TT054	TTN054 TN054 TTN-054	1995-11-30	R/V Thomas G. Thompson	Wilford D. Gardner (Chief Scientist)	data info

Instruments

MOCNESS1

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: MOCNESS1

Acronym: MOC1

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0097/

Generic Description:

The Multiple Opening/Closing Net and Environmental Sensing System or MOCNESS is a family of net systems based on the Tucker Trawl principle. The MOCNESS-1 carries nine 1-m2 nets usually of 335 micrometer mesh and is intended for use with the macrozooplankton. All nets are black to reduce contrast with the background. A motor/toggle release assembly is mounted on the top portion of the frame and stainless steel cables with swaged fittings are used to attach the net bar to the toggle release. A stepping motor in a pressure compensated case filled with oil turns the escapement crankshaft of the toggle release which sequentially releases the nets to an open then closed position on command from the surface. -- from the MOCNESS Operations Manual (1999 + 2003).

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
datatype	Sampling method / instrument type, e.g. MOCNESS-1	unitless	instrument
cruiseid	Cruise identification, e.g. NBP0202, for RVIB Palmer cruise 0202	unitless	cruise_id
year_local	4-digit year of the cruise (local time zone)	unitless	year
tow	Tow number	unitless	tow
day_local	2-digit day of the month (local time zone)	unitless	day
month_local	2-digit month of the year (local time zone)	unitless	month
press	Pressure	decibars (dbar)	press
temp	Water temperature	degrees Celsius ( C)	temp
sal	Salinity	practical salinity units (PSU)	sal
sigma	Sigma-t density	kilograms per cubic meter (kg/m3)	sigma_t
oxygen	O2	milliliters per liter (ml/L)	O2
recal_o2	Re-calibrated O2	milliliters per liter (ml/L)	O2
cal_o2	Calibrated O2	milliliters per liter (ml/L)	O2
winkler_o2	Oxygen Winkler values	milliliters per liter (ml/L)	O2

Status message

Database

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Dataset: CTD_MOCNESS1