Dataset: Euphotic Zone
Deployment: RR2201

Euphotic Zone

View Data: For data, See Dataset Metadata Page: https://osprey.bco-dmo.org/dataset/943861

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)

Project:

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

Version:

Deployment Synonyms:

BLOOFINZ-IO

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Description

Methods & Sampling

Dataset acquisition description

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).

Data Processing Description

Dataset Processing Description

More information about this dataset deployment

Funding

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

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

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	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	unitless	PAR
PAR_100m	PAR reading at 100 meters	unitless	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

Database

Contribute Data

Dataset: Euphotic Zone
Deployment: RR2201

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Euphotic ZoneDeployment: RR2201

Dataset acquisition description

Dataset Processing Description

Dataset: Euphotic Zone
Deployment: RR2201