Dataset: Gridded in-situ profiles

Name: Gridded in-situ profiles from glider deployments in the San Pedro Channel, CA in 2013 and 2014
Published: 2018-12-19
Keywords: oceans

Cite This Dataset

DOI:10.1575/1912/bco-dmo.751128.1

Spatial Extent: N:33.69088 E:-118.33291 S:33.4642 W:-118.516

Temporal Extent: 2013-03-12 - 2014-07-06

Project:

Collaborative Research: Use of Triple Oxygen Isotopes and O2/Ar to constrain Net/Gross Oxygen Production during upwelling and non-upwelling periods in a Coastal Setting (UpRISEE O2 upwelling)

OCE-RIG: The impact of submesoscale processes on oligotrophic carbon cycling and the sensitivity of this interaction to climatically driven changes (SHiP)

Principal Investigator:

William Haskell (University of California-Santa Barbara, UCSB-MSI)

Co-Principal Investigator:

Douglas E. Hammond (University of Southern California, USC)

Maria Prokopenko (Pomona College, Pomona)

Scientist:

Burton Jones (King Abdullah University of Science and Technology, KAUST)

Naomi M. Levine (University of Southern California, USC)

Student:

Elizabeth N. Teel (University of Southern California, USC)

Contact:

Burton Jones (King Abdullah University of Science and Technology, KAUST)

Elizabeth N. Teel (University of Southern California, USC)

BCO-DMO Data Manager:

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

Version:

Version Date:

2018-12-19

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Gridded in-situ profiles from glider deployments in the San Pedro Channel, CA in 2013 and 2014

Abstract:

This dataset includes chlorophyll a fluorescence and water temperature from gridded in-situ profiles from a slocum glider deployed between March and July in 2013 and 2014 in the San Pedro Channel, located in the Southern California Bight off the coast of Los Angeles.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2018-12-19	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.1575/1912/bco-dmo.751128.1	2019-05-28

Description

This dataset includes chlorophyll a fluorescence and water temperature from gridded in-situ profiles from a Slocum Glider deployed between March and July in 2013 and 2014 in the San Pedro Channel, located in the Southern California Bight off the coast of Los Angeles.

These data were published in Teel et al., 2018.

In addition to the tabular form of this dataset available by clicking the "Get Data" button on this page, it is also available as a Matlab (*.mat) file containing data matrices and vectors.
* Note that the tabular dataset has a "DEPTH" parameter, but there is none in the above .mat file. Each row of the matrices corresponds to 1m depth increments starting with the first row which corresponds to 1m depth to the last row number 80 corresponding to 80m depth.

Methods & Sampling

Glider deployment:
For this study, a slocum glider was deployed between March and July in 2013 and 2014 in the San Pedro Channel, located in the Southern California Bight off the coast of Los Angeles. The glider was deployed on a 28 km cross-channel path between Catalina Island and the Palos Verdes Peninsula and completed a single cross-channel pass every 1.5–2 days (average speed 1 km h−1). Data were collected between ∼ 3 and 90 m, with the exception of when the glider crossed the major shipping lanes where the glider was constrained to depths below 20 m to avoid damage or loss from ship traffic.

The GMT time stamp indicates the earliest time stamp for data binned within a single profile.

Glider deployments were from small boats belonging to the USC Wrigley Marine Sciences Center or from the R/V Yellowfin.

Instruments:
Teledyne Webb G1 Slocum electric gliders equipped with a WET Labs EcoPuck FL3 fluorometer (used for Chlorophyll a fluorescence), a WET Labs EcoPuck BB3 sensor (used for backscatter at wavelengths of 532, 660, and 880 nm), and a Sea-Bird flow-through CTD (used for temperature, salinity, and pressure).

For more methodology information see Teel et al., 2018.

Data Processing Description

Data processing:
Glider data were processed in Matlab (versions R2012b, R2014a, R2015b, and R2016b). The glider data from each 2-day transect were gridded onto an idealized glider transect with 500 m horizontal resolution and 1m vertical resolution that was approximately perpendicular to the mean flow and the coastline. Only glider data within 5 km of the idealized transect were used in this analysis (Fig. 1). Each 500 m bin (N = 62) corresponded approximately with a single downcast and upcast. Only profiles with data for > 85 % of the vertical bins were used for further analyses, thereby excluding partial profiles from under the shipping lanes. The remaining missing data (< 15 % of each profile) were filled using 2-D interpolation from all neighboring bins. A total of 557 profiles from 2013 and 1049 profiles from 2014 were accepted for further analyses.

BCO-DMO Data Manager Processing notes:
* Script to transform originally submitted matlab data matrices and vectors into a tabular dataset attached as a supplemental document to this dataset landing page.
* Tabular version of the data available by pressing the "Get Data" button. NaNs in the matlab data are displayed as "nd" for no data in the BCO-DMO data system.
* Data was rounded in matlab (or else would be 13 decimal places). LAT and LON rounded to 5 decimal places. CHL and TEMP rounded to 3 decimal places.
* ISO_DateTime_UTC (yyyy-mm-ddTHH:MM:SSZ) timestamp with time zone added to the tabular dataset in addition to the matlab datenum column.
* Added depth column to tabular dataset based on submitter's information that each row in the mat file corresponds to 1m depth increments with row 1 starting at 1m.

Data Files

File

gridded_glider.csv

(Comma Separated Values (.csv), 10.35 MB)
MD5:45c36b7f0cc53eadc431a6471a2bb0b0

Primary data file for dataset ID 751128

GriddedGlider_TandCHL.mat

(MATLAB Data (.mat), 2.18 MB)
MD5:364b0450f06d2164c2920a6b33aaef64

MatLAB .mat file containing gridded in-situ profiles from glider deployments in the San Pedro Channel, CA in 2013 and 2014.  For metadata and access to a tabular, ascii version of these data, see dataset landing page: https://www.bco-dmo.org/dataset/751128

* Note that the tabular dataset served from page https://www.bco-dmo.org/dataset/751128 has a "DEPTH" parameter, but there is no DEPTH within the .mat file.  Each row of the matrices corresponds to 1m depth increments starting with the first row which corresponds to 1m depth to the last row number 80 corresponding to 80m depth.

Supplemental Files

File
Gridded glider .mat to .csv filename: gridded_glider.m (Octet Stream, 2.60 KB) MD5:fc306d5861247c5aeecb0a4c6576cdb3 Matlab m-file script to take gridded glider matricies and vectors in from a .mat file, transform it to a tabular dataset and export it as .csv.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1260692
NSF Division of Ocean Sciences	OCE-1260296
NSF Ocean Sciences Research Initiation Grants	OCE-RIG-1323319

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
UpRISEE_SPOT_13-14		2013-01-16	R/V Yellowfin		data info

Instruments

CTD Sea-Bird

Supplied Name: Sea-Bird flow-through CTD

Supplied Description:

Sea-Bird flow-through CTD (used for temperature, salinity, and pressure)

Instrument Type

Generic Name: CTD Sea-Bird

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

Generic Description:

Conductivity, Temperature, Depth (CTD) sensor package from SeaBird Electronics, no specific unit identified. This instrument designation is used when specific make and model are not known. See also other SeaBird instruments listed under CTD. More information from Sea-Bird Electronics.

Fluorometer

Supplied Name: WET Labs EcoPuck FL3

Supplied Description:

WET Labs EcoPuck FL3 fluorometer (used for Chlorophyll a fluorescence).

Instrument Type

Generic Name: Fluorometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/113/

Generic Description:

A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ.

Optical Backscatter Sensor

Supplied Name: WET Labs EcoPuck BB3

Supplied Description:

WET Labs EcoPuck BB3 sensor (used for backscatter at wavelengths of 532, 660, and 880 nm)

Instrument Type

Generic Name: Optical Backscatter Sensor

Acronym: OBS

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
BINID	Bin identifier	unitless	nbin
DATENUM_GMT	Matlab datenum (Greenwich Mean Time)	unitless	DateTime
ISO_DateTime_UTC	Timestamp (UTC) in standard ISO 8601:2004(E) format yyyy-mm-ddTHH:MM:SSZ	yyyy-MM-dd'T'HH:mm:ss'Z'	ISO_DateTime_UTC
YEAR	Year in format yyyy	unitless	year
LAT	Latitude	decimal degrees (DD)	lat
LON	Longitude	decimal degrees (DD)	lon
DEPTH	Depth	meters (m)	depth
CHL	Chlorophyll a fluorescence	milligrams per meter cubed (mg/m^3)	chl_a
TEMP	Water temperature	degrees Celsius (C)	temp

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