Dataset: NH1417 NEMO CTD

Name: CTD profile downcasts from R/V New Horizon NEMO cruise NH1417 in the Eastern Pacific between San Diego and Hawaii from August to September 2014 (Phyto response to N substrates project)
Published: 2017-03-23
Keywords: oceans

Cite This Dataset

Spatial Extent: N:34.9707 E:-117.523 S:21.684 W:-158.633

Project:

Oligotrophic phytoplankton community response to changes in N substrates and the resulting impact on genetic, taxonomic and functional diversity (PhytoNsubResponse)

Program:

Dimensions of Biodiversity (Dimensions of Biodiversity)

Principal Investigator:

Matthew M. Mills (Stanford University)

Co-Principal Investigator:

Kevin R. Arrigo (Stanford University)

Matthew J. Church (University of Montana)

Dr Zbigniew Kolber (Soliense Inc.)

Jonathan P. Zehr (University of California-Santa Cruz, UCSC)

Contact:

Gert van Dijken (Stanford University)

BCO-DMO Data Manager:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version Date:

2017-03-23

Restricted:

Validated:

Current State:

Preliminary and in progress

CTD profile downcasts from R/V New Horizon NEMO cruise NH1417 in the Eastern Pacific between San Diego and Hawaii from August to September 2014 (Phyto response to N substrates project)

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Description

This dataset contains CTD data including temperature, salinity, depth, pressure, fluorescence, sigma-theta density, PAR, beam attenuation, and beam transmission from R/V New Horizon cruise NH1417 from August 18th to September 16th of 2014 in the Eastern Pacific between San Diego and Hawaii.

The R/V New Horizon cruise NH1417 was a Nutrient Effects on Marine microOrganisms (NEMO) cruise.

Methods & Sampling

Data was collected using standard oceanographic techniques. A CTD Rosette with 24 10L Niskin bottles was lowered to the maximum sampling depth and then brought back to the surface. Water was collected on up casts at discrete depths. Once on board seawater was collected from each bottle for analysis.

Data Processing Description

CTD data is only down cast, up cast data was removed. Data was 1m binned. Data processed using Seabird Seasoft software.

Calculation methods:
* Salinity (sal1,sal2) calculated with 1978 PRACTICAL SALINITY SCALE EQUATIONS, from IEEE Journal of Oceanic Engineering, Vol. OE-5, No. 1, January 1980, page 14.
* Derived density (sigma_theta,sigma_theta2) calculated with N.P. Fofonoff and R.C Millard Jr.; Unesco technical papers in marine science #44, 1983

BCO-DMO Data Manager Processing Notes:
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions
* blank values replaced with no data value 'nd'
* added Z to timestamp to make it ISO format
* rounded values to three decimal places except lat/lon left as 4 places
* replaced values of -10000000000 in sensor data with "nd" indicating no data

Data Files

File
ctd.csv (Comma Separated Values (.csv), 7.03 MB) MD5:82230e84a724a7f1611d77d598bdf43c Primary data file for dataset ID 685709

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1241221
NSF Division of Ocean Sciences	OCE-1241093
NSF Division of Ocean Sciences	OCE-1241263

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
NH1417		2014-08-18	R/V New Horizon	Matthew M. Mills (Chief Scientist) Dr Irina Shilova (Co-Chief Scientist)	data info

Instruments

CTD - profiler

Supplied Name: CTD Rosette

Supplied Description:

Instrument Type

Generic Name: CTD - profiler

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

Generic 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.

Niskin bottle

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: Niskin bottle

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/

Generic Description:

A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	Cruise identifier	unitless	cruise_id
station	Station identifier	unitless	station
cast	cast identifier	unitless	cast
ISO_DateTime_UTC	ISO timestamp based on the ISO 8601:2004(E) standard in format YYYY-mm-ddTHH:MM:SS[.xx]Z (UTC)	unitless	ISO_DateTime_UTC
lat	Latitude	decimal degrees	lat
lon	Longitude; west is negative	decimal degrees	lon
depth	Derived Depth	meters	depth
press	Pressure	digiquartz (db)	press
temp	Temperature 1	degrees Celsius	temp
temp2	Temperature 2	degrees Celsius	temp2
sal	Salinity 1 from instrument PSS-78	practical salinity units (PSU)	sal
sal2	Salinity 2 from instrument PSS-78	practical salinity units (PSU)	sal2
O2	Dissolved oxygen from SBE 43	milliliters per liter (ml/L)	O2
fluor	In-situ chlorophyll a flourescence from Wet Labs Eco-AFL/FL	milligrams per meter squared (mg/m3)	fluor
PAR	Photosynthetically Active Radiation from Biospherical QSP-200L	microEinsteins per square meter per second (uEIN/m2/s)	PAR
density	Derived Density- sigma theta 1	kilograms per meter squared	sigma_theta
density2	Derived Density- sigma theta 2	kilograms per meter squared	sigma_theta
beam_att	Beam Attenuation from Chelsea/Seatech instrument	per meter (1/m)	beam_cp
beam_trans	Beam Transmission from Chelsea/Seatech instrument	percent	light_trans

Status message

Database

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Dataset: NH1417 NEMO CTD