Dataset: KM1919-KM1920 hydrography and nutrients

Name: CTD hydrography and nutrients from casts conducted on R/V Kilo Moana cruises KM1919 and KM1920 from September to October 2019
Published: 2021-04-20
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.849710.1

Spatial Extent: N:22.6667 E:-106.88594 S:13.99972 W:-110.00235

Temporal Extent: 2019-09-26 - 2019-10-19

Project:

Dimensions: Diversity, assembly and function of microbial communities on suspended and sinking particles in a marine Oxygen Deficient Zone (ETNP_ParticleOmics)

Permanence of the recent expansions of the OMZ and denitrification regimes in the eastern tropical North Pacific (ETNP OMZ Denitrification)

Program:

Dimensions of Biodiversity (Dimensions of Biodiversity)

Principal Investigator:

Allan Devol (University of Washington, UW)

Co-Principal Investigator:

Richard Keil (University of Washington, UW)

Gabrielle Rocap (University of Washington, UW)

Contact:

Allan Devol (University of Washington, UW)

BCO-DMO Data Manager:

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

Version:

Version Date:

2021-04-20

Restricted:

Validated:

Yes

Current State:

Final no updates expected

CTD hydrography and nutrients from casts conducted on R/V Kilo Moana cruises KM1919 and KM1920 from September to October 2019

Abstract:

The dataset contains the processed bottle files, i.e., depths and associated data collected electronically by the CTD, for all CTD casts during cruises KM1919 and KM1920, along with all nutrient data on casts from which it was collected. The nutrients include nitrate, nitrite, silicate, phosphate, and ammonium. The concentrations for all nutrients are in micromoles per kg as is the CTD oxygen concentration. These two cruises took place on the R/V Kilo Moana from September to October 2019 in the Eastern Tropical North Pacific, off the coast of Mexico and Southern California. The data were collected as part of NSF grant numbers 1542240 to Gabrielle Rocap, Rick Keil, Allan Devol, and Curtis Deutsch along with NSF-1657958 to Allan Devol.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2021-04-20	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.849710.1	2021-04-23

Methods & Sampling

Data were collected CTD during cruises KM1919 and KM1920.

The CTD data has been reprocessed and aligned, and outliers have been removed. Nutrient samples were filtered (Sterivex 0.22um) before analysis and analyzed using the US-JGOFS protocols (http://usjgofs.whoi.edu/protocols_rpt_19.html). All data are considered preliminary.

Known Problems:
Calibration salinity samples analyzed using an AutoSal salinometer agreed with CTD sensor 0, but sensor 1 was significantly off. Consequently, salinity values and derived values (density, oxygen, oxygen saturation) were calculated only from sensor 0. Sensor 1 data not included.

Data Processing Description

Data Processing:
Raw data from the CTD was processed using SeaBird software programs (Data conversion, Align, Thermal mass, Derive, Bin average and Bottle Summary).

BCO-DMO Processing:
- converted dates from Excel format to YYYY-MM-DD;
- renamed fields to comply with BCO-DMO naming conventions;
- added Cruise_ID field based on date;
- corrected date for station 8, second occupation.

Data Files

File
KM1919-20_CTD.csv (Comma Separated Values (.csv), 85.18 KB) MD5:475343ef959a95a86064839bf17e27cb Primary data file for dataset ID 849710

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1657958
NSF Division of Environmental Biology	DEB-1542240

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
KM1919		2019-09-21	R/V Kilo Moana	Allan Devol (Chief Scientist)	data info
KM1920		2019-10-02	R/V Kilo Moana	Gabrielle Rocap (Chief Scientist)	data info

Instruments

CTD Sea-Bird 911

Supplied Name: CTD-SBE 911

Supplied Description:

CTD-SBE 911; factory calibrations.

Instrument Type

Generic Name: CTD Sea-Bird 911

Acronym: CTD SBE 911

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0035/

Generic Description:

The Sea-Bird SBE 911 is a type of CTD instrument package. The SBE 911 includes the SBE 9 Underwater Unit and the SBE 11 Deck Unit (for real-time readout using conductive wire) for deployment from a 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, fluorescence, light (PAR), light transmission, etc.). More information from Sea-Bird Electronics.

WET Labs {Sea-Bird WETLabs} C-Star transmissometer

Supplied Name: Wet labs C-Star

Supplied Description:

Beam attenuation and transmission were by Wet labs C-Star.

Instrument Type

Generic Name: WET Labs {Sea-Bird WETLabs} C-Star transmissometer

Acronym: WL CSTAR Trans

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0160/

Generic Description:

The C-Star transmissometer has a novel monolithic housing with a highly intgrated opto-electronic design to provide a low cost, compact solution for underwater measurements of beam transmittance. The C-Star is capable of free space measurements or flow-through sampling when used with a pump and optical flow tubes. The sensor can be used in profiling, moored, or underway applications. Available with a 6000 m depth rating.

More information on Sea-Bird website: https://www.seabird.com/c-star-transmissometer/product?id=60762467717

WETLabs ECO-FLNTU

Supplied Name: Wetlabs ECO-AFL/FL

Supplied Description:

Chlorophyll was measured by Wetlabs ECO-AFL/FL.

Instrument Type

Generic Name: WETLabs ECO-FLNTU

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0215/

Generic Description:

The ECO FLNTU is a dual-wavelength, single-angle sensor for simultaneously determining both chlorophyll fluorescence and turbidity.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Attn	Beam attenuation (loss of light) of a narrow, well collimated beam of light; beam attenuation due to particles; the particulate beam attenuation coefficient (cp)	1/m	beam_cp
Cruise_ID	cruise designation; name	unitless	cruise_id
Date	date (GMT); format: YYYY-MM-DD Format: %Y-%m-%d	unitless	date
Depth	sample depth below the sea surface	meters (m)	depth
Fluor	chlorophyll a	micrograms per liter (ug/l)	fluor
Latitude	latitude, in decimal degrees	decimal degrees North	lat
Longitude	longitude, in decimal degrees	decimal degrees East	lon
NH4	Ammonium	micromoles per kilogram (umol/kg)	NH4
NO2	Nitrite	micromoles per kilogram (umol/kg)	NO2
NO3	Nitrate	micromoles per kilogram (umol/kg)	NO3
O2sat	O2 saturation sensor 0	percent (%)	O2sat
O2_0	O2 sensor 0	micromoles per kilogram (umol/kg)	O2
Par	Photosynthetically Available [Active] Radiation; downwelling irradiance	microEinsteins per square meter per second (uEinsteins/m2/sec)	PAR
PO4	Orthophosphate (phosphate, reactive phosphorus)	micromoles per kilogram (umol/kg)	PO4
Press	pressure	decibars	press
Sal_0	salinity sensor 0	psu	sal
Sigma_theta	sigma theta	kilograms per cubic meter (kg/m3)	sigma_0
Si_OH4	Silicate (Orthosilicic Acid)	micromoles per kilogram (umol/kg)	Silicate
station	station identifier	unitless	station
Trans	light transmission, as percent	percent (%)	trans
T_0	temperature sensor 0	degrees Celsiu	temp

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Database

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Dataset: KM1919-KM1920 hydrography and nutrients