Dataset: Water column nutrients - Inside and outside kelp

Name: Nitrate and phosphate from various depths throughout the water column inside and outside a kelp forest near the Monterey Peninsula, California, USA from June to August 2018 and 2019
Published: 2021-10-20
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.863702.1

Spatial Extent: N:36.63088 E:-121.897 S:36.61795 W:-121.9188

Temporal Extent: 2018-06-12 - 2019-08-02

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)

BCO-DMO Data Manager:

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

Version:

Version Date:

2021-10-20

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Nitrate and phosphate from various depths throughout the water column inside and outside a kelp forest near the Monterey Peninsula, California, USA from June to August 2018 and 2019

Abstract:

This dataset includes nitrate and phosphate from various depths throughout the water column collected at mooring sites inside and outside a kelp forest near the Monterey Peninsula, California, USA. Data were collected from June to August in 2018 and 2019.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2021-10-20	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.863702.1	2022-08-23

Methods & Sampling

Sampling Locations:
Sampling was conducted near the Monterey Peninsula near Pacific Grove and Monterey, California, USA. Kelp sites ranged from 8.8 to 10.3 meters deep and offshore sites ranged from 13.1 to 16.5 m deep.

Instrument moorings were deployed in 2018 in the following areas: a wave-protected kelp forest, ~100 meters offshore of the protected site, in a wave-exposed site devoid of kelp (historically has had kelp), and ~100 meters offshore of the exposed site.

Instrument moorings were deployed in 2019 in the following areas: a wave-protected kelp forest, ~175 meters offshore of the protected site, in a wave-exposed kelp site, and ~180 meters offshore of the exposed site.

Sampling Depths:
1B = 1 meter above the bottom,
4B = 4 meters above the bottom,
10B = 10 meters above the bottom,
1T = 1 meter below the sea surface,
S = Sea surface.

Methodology:
Discrete water samples were collected bi-weekly at various depths at instrument mooring sites using Niskin bottles. Each sample collection was accompanied by a CTD cast at the time of collection. 60 mL samples were taken at the depths listed above using Niskin bottles. Samples were kept in a dark cooler and transported to the lab to be frozen until analysis. A WestCo SmartChem 200 discrete auto-analyzer was used to obtain nitrate and phosphate concentrations. Internal control seawater was used on each run sequence and was run after approximately every 10 unknowns with a precision of ± 0.022. Partial results of this data are reported in Traiger et al. (In review).

Data Processing Description

Data Processing:
Data were processed using R software version 1.4.1717. Seawater density from CTD casts was matched to each sample collected. Nitrate-nitrogen and phosphate-phosphorus were converted to to NO₃ and PO₄ in kg L⁻¹ which was then converted to µmol L⁻¹.

BCO-DMO Processing:
- created the ISO8601 date-time field in UTC.

Data Files

File
nutrients.csv (Comma Separated Values (.csv), 66.77 KB) MD5:c0530540edba92a9588d57f26156e6a8 Primary data file for dataset ID 863702

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

None available yet

Instruments

CTD Sea-Bird SBE SEACAT 19plus

Supplied Name: SeaBird Electronics 19Plus V2 SeaCAT

Supplied Description:

Sensors: Temperature calibrated 14 Jan 2018,
Conductivity calibrated 14 Jan 2018,
Pressure calibrated 2 Jan 2018,
Oxygen calibrated 18 Jan 2018,
PAR log calibrated 30 Nov 2017,
Fluorometer calibrated 26 December 2017,
Turbidity calibrated 26 December 2017.

Instrument Type

Generic Name: CTD Sea-Bird SBE SEACAT 19plus

Acronym: Sea-Bird SEACAT 19 Plus

Generic Description:

Self contained self powered CTD profiler. Measures conductivity, temperature and pressure in both profiling (samples at 4 scans/sec) and moored (sample rates of once every 5 seconds to once every 9 hours) mode. Available in plastic or titanium housing with depth ranges of 600m and 7000m respectively. Minature submersible pump provides water to conductivity cell.

Discrete Analyzer

Supplied Name: WestCo SmartChem 200 discrete auto-analyzer

Supplied Description:

Instrument Type

Generic Name: Discrete Analyzer

Generic Description:

Discrete analyzers utilize discrete reaction wells to mix and develop the colorimetric reaction, allowing for a wide variety of assays to be performed from one sample. These instruments are ideal for drinking water, wastewater, soil testing, environmental and university or research applications where multiple assays and high throughput are required.

Niskin bottle

Supplied Name: Niskin bottles

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	Site code: PK = Protected kelp 2018, PO = Protected offshore 2018, EK = Exposed kelp 2018, EO = Exposed offshore 2018, MK = Protected kelp 2019, MO = Protected offshore 2019, OK = exposed kelp 2019, OO = Exposed offshore 2019.	unitless	site
Date	Date (PST) in format YYYY-MM-DD Format: %Y-%m-%d	unitless	date
Site_depth_0_tide	Depth of the site at at 0 tide	meters (m)	depth_w
Latitude	Latitude	decimal degrees North	lat
Longitude	Longitude	decimal degrees West	lon
Location	Indicates if the location is Kelp or Offshore	unitless	site_descrip
Sample_depth	Depth that each sample was collected: 1B = 1 meter above the bottom, 4B = 4 meters above the bottom, 10B = 10 meters above the bottom, 1T = 1 meter below the sea surface, S = Sea surface.	unitless	sample_descrip
Niskin_Time	Time of sample collection (PST) in format hh:mm Format: %H:%M	unitless	time
Density	Seawater density from CTD cast	kilograms per liter (kg L-1)	density
Nitrate_N	Nitrate-nitrogen	milligrams per liter (mg L-1)	N
NO3_umolL	Nitrate	micromoles per liter (umol L-1)	NO3
Phosphate_P	Phosphate-phosphorus	milligrams per liter (mg/L)	P
PO4_umolL	Phosphate	micromoles per liter (umol L-1)	PO43-
ISO_DateTime_UTC	Date and time (UTC) of sample collection in ISO8601 format: YYYY-MM-DDThh:mmZ Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC

Database

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Dataset: Water column nutrients - Inside and outside kelp