Dataset: Euphotic Zone

Name: Estimates of Euphotic Zone (EZ) depths from R/V Roger Revelle cruise RR2201 in the Eastern Indian Ocean (Argo Basin) from February to March 2022
Published: 2024-11-18
Keywords: Euphotic Zone, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.943861.1

Spatial Extent: N:-13.01 E:119.497 S:-17.182 W:114.157

Northwest Australia, Argo Basin

Temporal Extent: 2022-02-04 - 2022-03-01

Project:

Collaborative Research: Mesoscale variability in nitrogen sources and food-web dynamics supporting larval southern bluefin tuna in the eastern Indian Ocean (BLOOFINZ-IO)

Program:

Second International Indian Ocean Expedition (IIOE-2)

Principal Investigator:

Michael R. Landry (University of California-San Diego, UCSD-SIO)

BCO-DMO Data Manager:

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

Version:

Version Date:

2024-11-18

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Estimates of Euphotic Zone (EZ) depths from R/V Roger Revelle cruise RR2201 in the Eastern Indian Ocean (Argo Basin) from February to March 2022

Abstract:

This dataset contains estimates of Euphotic Zone (EZ) depths based on mean light extinction coefficients calculated from PAR sensor readings at 5 and 100 meters from cruise RR2201 on R/V Roger Revelle (BLOOFINZ-IO, January-March 2022) in the Argo Basin region off NW Australia.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2024-11-18	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.943861.1	2024-11-27

Methods & Sampling

Euphotic Zone (EZ) depth was defined as the depth at which photosynthetically available radiation (PAR) was 1% of incident surface radiation. Mean light extinction coefficients (Ext Coeff, m-1) were calculated from PAR sensor readings at 5 and 100 meters from CTD downcast profiles at 1-meter resolution according to the equation:

Ext Coeff = -ln(PAR100m/PAR5m)/95.

Euphotic Zone (m) was calculated as EZ = -ln(0.01)/(Ext Coeff).

BCO-DMO Processing

- Imported original file "Euphotic Zone_BCO_DMO Submission.xlsx" into the BCO-DMO system.
- Renamed fields to comply with BCO-DMO naming conventions.
- Converted the "DateTimeUTC" column to ISO 8601 format and renamed "ISO_DateTime_UTC".
- Saved final file as "943861_v1_rr2201_euphotic_zone.csv"

Data Files

File
943861_v1_rr2201_euphotic_zone.csv (Comma Separated Values (.csv), 4.43 KB) MD5:59afd97f05f6a9789e2cff51df996df0 Primary data file for dataset ID 943861, version 1

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1851558

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
RR2201	BLOOFINZ-IO	2022-01-20	R/V Roger Revelle	Michael R. Landry (Chief Scientist)	data info

Instruments

Biospherical PAR sensor

Supplied Name: QSP-2000, Quantum Scalar PAR Sensor, Biospherical Instruments

Supplied Description:

Instrument Type

Generic Name: Biospherical PAR sensor

Generic Description:

An irradiance sensor designed to measure Photosynthetically Active Radiation (PAR), manufactured by Biospherical Instruments Inc.

CTD Sea-Bird

Supplied Name: Seabird SBE 9plus CTD

Supplied Description:

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.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Cruise	Cruise ID (RR2201)	unitless	cruise_id
Event	unique event number in UTC time as YYYYMMDD.mmss.###, where ### distinguishes events entered within the same minute	unitless	event
ISO_DateTime_UTC	Date and time (UTC) of CTD deployment in ISO 8601 format Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
Latitude	latitude (North is positive; South is negative)	decimal degrees	lat
Longitude	longitude (East is positive; West is negative)	decimal degrees	lon
Cycle_Day	lagrangian experiments following a drogued drifter are noted as Cycle,Day, e.g. C1,D1; C1,D2, etc. EOC = end of cycle; e.g., EOC1. ARGO station number	unitless	no_bcodmo_term
CTD_Cast	CTD cast number in Event Log	unitless	cast
PAR_5m	PAR reading at 5 meters	umoles of photons m-2 s-1	PAR
PAR_100m	PAR reading at 100 meters	umoles of photons m-2 s-1	PAR
Ext_Coeff	mean light extinction coefficient 5-100 meters	reciprocal meters (m-1)	no_bcodmo_term
EZ_1pcnt	depth of the 1% euphotic zone	meters (m)	no_bcodmo_term

Status message

Database

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Dataset: Euphotic Zone