Dataset: Discrete Seawater Samples

Name: Discrete seawater samples collected at the surface, 1 m below the surface, and 1 m above the bottom two times a week at each mooring (Kelp and Outside) from June 12, 2018 to August 3, 2018.
Published: 2020-10-12
Keywords: ocean acidification, kelp forest, biogeochemistry, spatiotemporal variability, upwelling, DIC, Alkalinity, pH, temperature, salinity, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.826410.1

Spatial Extent: N:36.6222 E:-121.9007333 S:36.62161667 W:-121.9017

Temporal Extent: 2018-06-12 - 2018-08-03

Project:

Collaborative Research: RUI: Building a mechanistic understanding of water column chemistry alteration by kelp forests: emerging contributions of foundation species (Kelp forest biogeochemistry)

Principal Investigator:

Kerry J. Nickols (California State University Northridge, CSUN)

Co-Principal Investigator:

Robert B. Dunbar (Stanford University)

Scientist:

Heidi Hirsh (Stanford University)

Stephen G. Monismith (Stanford University)

David Mucciarone (Stanford University)

Yuichiro Takeshita (Monterey Bay Aquarium Research Institute, MBARI)

Sarah Traiger (United States Geological Survey, USGS)

Project Coordinator:

Kerry J. Nickols (California State University Northridge, CSUN)

Contact:

Heidi Hirsh (Stanford University)

BCO-DMO Data Manager:

Karen Soenen (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2020-10-12

Restricted:

Validated:

Yes

Current State:

Final with updates expected

Discrete seawater samples collected at the surface, 1 m below the surface, and 1 m above the bottom two times a week at each mooring (Kelp and Outside) from June 12, 2018 to August 3, 2018.

Abstract:

Discrete seawater samples collected at the surface, 1 m below the surface, and 1 m above the bottom two times a week at each mooring (Kelp and Outside) from June 12, 2018 to August 3, 2018.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2020-10-12	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.826410.1	2020-10-16

Description

These data are published in Hirsh et al., see related publications section.

Methods & Sampling

Discrete seawater samples were collected at the surface, 1 m below the surface, and 1 m above the bottom two times a week at each mooring (Kelp and Outside) from June 12, 2018 to August 3, 2018 between 10:30 and 14:00 local time. Water was collected using a 1.7 L Niskin bottle and subsampled into a 30 mL glass serum bottle (with rubber stopper and crimp cap) for DIC and a 120 mL glass bottle for TA. All samples were immediately preserved with 1 μL of saturated mercuric chloride solution for every 1 mL of sample (Dickson et al., 2007)

Data Processing Description

DIC and TA samples were analyzed within four months of sample collection. TA was analyzed with a Metrohm 855 Robotic Titrosampler using a standardized 0.1 M HCl (Acros, 124200010) in a 0.6 M NaCl background. TA was calculated using a modified gran method in an open cell (Dickson et al., 2003). The acid concentration was calibrated by measuring certified reference materials (Dickson, 2010) every 10 samples (36 CRM runs; batch numbers 169, 172, 175, and 176). Precision and accuracy were estimated as 3.4 mol kg-1, based on the measured CRM values. DIC samples were analyzed using a custom-built instrument loosely based on the design of O’Sullivan and Millero (1998). The DIC instrument was calibrated using CRMs approximately every hour. Instrumental precision was estimated as 0.8 mol kg-1, based on 60 measured CRM values (batch numbers 169, 172, and 175). DIC accuracy was estimated at 2 mol
kg-1. Discrete DIC and TA samples were used to calculate in situ pH using CO2SYS (van Heuven et al., 2011) for comparison with moored pH logger data.

Sometimes the depth was too shallow for the CTD to measure an accurate surface salinity. Salinity measurements lower than 33.4 were flagged and replaced by the mean near surface salinity measured at the kelp mooring site = 33.6.

Salinity was flagged (and replaced with the mean salinity, 33.6) for 4 samples reported here:

Outside Surface July 6, 2017 11:08
Kelp Surface July 24, 2017 13:02
Outside Surface July 31, 2017 11:30
Kelp Surface July 31, 2017 12:04

BCO-DMO Processing notes:

Adjusted column headers to comply with database requirements
Added ISO_DateTime_UTC column, converting Date and Time to ISO format, and timezone from Pacific Standard Time (PST) to UTC

Data Files

File
discrete_samples.csv (Comma Separated Values (.csv), 10.67 KB) MD5:09774a0312cdb3cfc22984e787d87ac8 Primary data file for dataset ID 826410

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1737176
NSF Division of Ocean Sciences	OCE-1737096

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
KELP	Protected Kelp, PK, Inner, Kelp	2018-06-08	Mooring - Hopkins Marine Station	Kerry J. Nickols (Chief Scientist) Heidi Hirsh (Contact)	data info
OUTSIDE	Outside Kelp, PO, Outer	2018-06-07	Mooring - Hopkins Marine Station	Kerry J. Nickols (Chief Scientist) Heidi Hirsh (Contact)	data info

Instruments

CTD Sea-Bird SEACAT

Supplied Name: SBE 19plus V2 SeaCAT Profiler CTD

Supplied Description:

Instrument Type

Generic Name: CTD Sea-Bird SEACAT

Acronym: CTD SEACAT

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/350/

Generic Description:

The CTD SEACAT recorder is an instrument package manufactured by Sea-Bird Electronics. The first Sea-Bird SEACAT Recorder was the original SBE 16 SEACAT developed in 1987. There are several model numbers including the SBE 16plus (SEACAT C-T Recorder (P optional))and the SBE 19 (SBE 19plus SEACAT Profiler measures conductivity, temperature, and pressure (depth)). M ore information from Sea-Bird Electronics.

Niskin bottle

Supplied Name: 1.7 Niskin bottle

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
Site	Mooring (Kelp or Outside)	unitless	Site_ID
Sample_ID	Sample identifier	unitless	sample
Longitude	Longitude of mooring location, west is negative	decimal degrees	lon
Latitude	Latitude of mooring location, south is negative	decimal degrees	lat
Depth_ID	Identifier for the depth of the sample (1B = 1 m above bottom, 1T = 1 m below surface, S=surface)	unitless	depth
Depth_m	Actual depth (from CTD)	meters (m)	depth
Date	Local Date (PST)	unitless	date
Time	Local Time (PST)	unitless	time
DIC	Dissolved inorganic carbon	micromoles per kilogram (umol/kg)	DIC
TA	Total alkalinity	micromoles per kilogram (umol/kg)	TALK
Salinity	Salinity	unitless	sal
Temperature	Water temperature	degrees Celsius (°C)	temperature
pH	pH	unitless	pH
ISO_DateTime_UTC	Timestap (date and time) in ISO format, UTC (yyyy-mm-ddThh:mmZ)	unitless	ISO_DateTime_UTC

Status message

Database

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Dataset: Discrete Seawater Samples