Dataset: CTD KN195-03

Name: CTD data from the equatorial and north Pacific from R/V Knorr cruise KN195-03 in 2009 (Subseafloor Microbial Life project)
Published: 2015-09-17
Keywords: oceans

Cite This Dataset

Spatial Extent: N:30.3555 E:-86.1895 S:-4.2363 W:-157.872

Project:

Oceanographic control and global distributions of subseafloor microbial life and activity (Subseafloor Microbial Life)

Program:

Center for Dark Energy Biosphere Investigations (C-DEBI)

Principal Investigator:

Steven L. D'Hondt (University of Rhode Island, URI-GSO)

Co-Principal Investigator:

Robert Pockalny (University of Rhode Island, URI-GSO)

David C. Smith (University of Rhode Island, URI-GSO)

Arthur J. Spivack (University of Rhode Island, URI-GSO)

BCO-DMO Data Manager:

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

Version:

17 Sept 2015

Version Date:

2015-09-17

Validated:

Yes

Current State:

Final no updates expected

CTD data from the equatorial and north Pacific from R/V Knorr cruise KN195-03 in 2009 (Subseafloor Microbial Life project)

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Description

CTD hydrocasts were performed during the KN195-03 cruise in the equatorial and north Pacific with a Sea-Bird SBE 9.

Related references:
Walsh, E.A., Kirkpatrick, J.K., Rutherford, S.D., Smith, D.C., Sogin, M.L, D’Hondt, S. 2015. Bacterial diversity and community composition from seasurface to subseafloor. In Press - ISME J.

Methods & Sampling

CTD Hydrocasts were performed with a Sea-Bird SBE 9 mounted near the base of a Niskin 24 Bottle Rosette. The CTD instrumentation included Conductivity (S/N 2186 & 2670), Temperature (ITS-90, S/N 4039 & 4195), Pressure (Digiquartz, S/N 785), Oxygen (SBE 43, S/N 0273), Fluorescence (Wetlab ECO-AFL/FL, S/N FLNTURTD-304), and Beam Transmission (Chelsea/Seatech/Wetlab CStar, S/N CST-1116DR). The data were processed with Seasave v. 7.18.

The downcast was conducted at 60 m per minute to a maximum depth of ~5 m above the seafloor (based on altimeter data). Features were selected from the downcast data for sampling on the upcast. These features included oxygen minimum layer(s), chlorophyll maximum layer(s) and the thermocline. In addition, standard depths of bottom, 50 m above bottom, 5000 m, 4000 m, 3000 m, 2000 m, 1500m, 1000m, 300m, 200m, 100 m, 50 m, 10 m, and surface were sampled.

Water samples were collected with a 24 bottle rosette with 10-L Niskin bottles. The water was filtered with flat membrane filters (Supor-200, 47-mm diameter, 0.2 µm P/N 60301) were placed into Swinex filter holders and attached to the petcock valve of the Niskin bottles with 1/4" tubing. The valves were opened and the water was pushed through the filters with the compressed air. The filtration rate is ~200 ml per minute. Filtered water samples were collected for molybdenum and nitrogen isotopes. When the water stopped dripping through the filter, the filters were removed, folded in half and placed into a whirl-pak bag and stored at -70 degrees C in the lower lab freezer.

Data Processing Description

The CTD data were processed with Seasave v. 7.18.

BCO-DMO Processing:
- Modified parameter names to conform with BCO-DMO naming conventions;
- Obtained lat_start, lon_start, date_start, and time_start from the CTD file headers;
- Converted lat and lon to decimal degrees;
- Added ISO_DateTime_Start column.

Data Files

File
KN195-03_CTD.csv (Comma Separated Values (.csv), 27.50 MB) MD5:9f2e10a617f783c0529f63ddc83a6d23 Primary data file for dataset ID 567276

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-0752336

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
KN195-03	EQP Equatorial Pacific	2009-01-12	R/V Knorr	Steven L. D'Hondt (Chief Scientist)	data info

Instruments

CTD Sea-Bird 9

Supplied Name: Sea-Bird SBE 9

Supplied Description:

CTD Hydrocasts were performed with a Sea-Bird SBE 9 mounted near the base of a Niskin 24 Bottle Rosette.

Instrument Type

Generic Name: CTD Sea-Bird 9

Acronym: CTD SBE 9

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/130/

Generic Description:

The Sea-Bird SBE 9 is a type of CTD instrument package. The SBE 9 is the Underwater Unit and is most often combined with the SBE 11 Deck Unit (for real-time readout using conductive wire) when deployed from a research vessel. The combination of the SBE 9 and SBE 11 is called a SBE 911. The SBE 9 uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 and SBE 4). The SBE 9 CTD can be configured with auxiliary sensors to measure other parameters including dissolved oxygen, pH, turbidity, fluorometer, altimeter, etc.). Note that in most cases, it is more accurate to specify SBE 911 than SBE 9 since it is likely a SBE 11 deck unit was used. more information from Sea-Bird Electronics

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	Cruise identification number.	dimensionless	cruise_id
station	Station identification number.	dimensionless	station
cast	Cast number.	dimensionless	cast
lat_start	Latitude at start of cast.	decimal degrees	lat_start
lon_start	Longitude at start of cast.	decimal degrees	lon_start
date_start	Date (YYYYmmdd) at start of cast.	YYYYmmdd	date_start
time_start	Time (HH:MM:SS) at start of cast.	HH:MM:SS	time_start
ISO_DateTime_Start	Date and time at start of cast, formatted to ISO8601 standard.	YYYY-mm-ddTHH:MM:SS.xx	ISO_DateTime_UTC
press	Pressure. Originally named 'PrDM'.	decibars (db)	press
temp	Temperature, ITS-90 (primary). Originally named 'T090C'.	degrees Celsius	temp
temp2	Temperature, ITS-90 (secondary). Originally named 'T190C'.	degrees Celsius	temp2
cond	Conductivity (primary). Originally named 'C0S/m'.	Siemens per meter (S/m)	cond
cond2	Conductivity (secondary). Originally named 'C1S/m'.	Siemens per meter (S/m)	cond2
O2_volt	Oxygen voltage from SBE43. Originally named 'Sbeox0V'.	volts	O2_v
bean_trans	Beam transmission from Chelsea/Seatech/Wetlab Cstar. Originally named 'Xmiss'.	percent (%)	trans
fluor	Fluorescence from Wetlab ECO-AFL/FL. Originally named 'FlECO-AFL'.	milligrams per cubic meter (mg/m^3)	fluor
turbidity	FLNTU turbidity. Originally named 'Upoly0'.	?	turbidity
density	Density (primary). Originally named 'Density00'.	kilograms per cubic meter (kg/m^3)	density
density2	Density (secondary). Originally named 'Density11'.	kilograms per cubic meter (kg/m^3)	density
sigma_t	Sigma-t density (primary). Originally named 'Sigma-t00'.	kilograms per cubic meter (kg/m^3)	density
sigma_t_2	Sigma-t density (secondary). Originally named 'Sigma-t11'.	kilograms per cubic meter (kg/m^3)	sigma_t
potemp	Potential temperature, ITS-90 (primary). Originally named 'Potemp090C'.	degrees Celsius	potemp
potemp2	Potentential temperature, ITS-90 (secondary). Originally named 'Potemp190C'.	degrees Celsius	potemp2
sal	Salinity (primary). Originally named 'Sal00'.	practical salinity units (PSU)	sal
sal2	Salinity (secondary). Originally named 'Sal11'.	practical salinity units (PSU)	sal2
O2_pcnt_sat	Oxygen percent saturation from SBE43. Originally named 'Sbeox0PS'.	percent (%)	O2_sat_pcnt
O2	Oxygen from SBE43. Originally named 'Sbeox0Mm/Kg'.	micromoles per kilogram (umol/kg)	O2
sal_diff	Salinity difference (sal2 - sal). Originally named 'SecS-priS'.	practical salinity units (PSU)	sal_diff
cond_diff	Conductivity difference (cond2 - cond). Originally named 'T2-T190C'.	Siemens per meter (S/m)	no_bcodmo_term
soud_vel	Sound velocity. Originally named 'SvWM'.	Wilson meters per second (m/s)	sound_vel

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Dataset: CTD KN195-03