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GBR benthic light (bPAR) from ocean colour, 2002-2019 (NESP TWQ 5.3, AIMS, Go2Q Consulting and JCU)

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  • National Environmental Science Program Tropical Water Quality (NESP TWQ) Hub - Funding Program - 2015 - 2020 (Dept. of the Environment and Energy)
    • GBR benthic light (bPAR) from ocean colour, 2002-2019 (NESP TWQ 5.3, AIMS, Go2Q Consulting and JCU)



Identification info
Data identification (MCP)
Citation
Citation
Title  GBR benthic light (bPAR) from ocean colour, 2002-2019 (NESP TWQ 5.3, AIMS, Go2Q Consulting and JCU)
Date
Date
Date  2020-05-14
Date type  creation: date identifies when the resource was brought into existence
Date
Date
Date  2020-10-06
Date type  revision: date identifies when the resource was examined or re-examined and improved or amended
Cited responsible party
Individual name  Robson, Barbara, Dr
Organisation name  Australian Institute of Marine Science (AIMS)
Role  principalInvestigator: key party responsible for gathering information and conducting research
Contact Information
Contact
Phone
Telephone
Voice  +61 7 4753 4324
Address
Address
Delivery point  PRIVATE MAIL BAG 3, TOWNSVILLE MAIL CENTRE
City  Townsville
Administrative area  Queensland
Postal code  4810
Country  Australia
Electronic mail address  b.robson@aims.gov.au
Cited responsible party
Individual name  Magno-Canto, Marites, Ms
Organisation name  James Cook University and AIMS@JCU
Role  coInvestigator: one of the key parties responsible for gathering information and conducting research
Contact Information
Contact
Address
Address
Delivery point  James Cook University
City  Townsville
Administrative area  Queensland
Postal code  4810
Country  Australia
Electronic mail address  marites.canto@my.jcu.edu.au
Cited responsible party
Individual name  McKinna, Lachlan, Dr
Organisation name  Go2Q Pty. Ltd.
Role  coInvestigator: one of the key parties responsible for gathering information and conducting research
Contact Information
Contact
Phone
Telephone
Voice  +61 7 5414 1733
Address
Address
Delivery point  PO Box 61
City  Buderim
Administrative area  Queensland
Postal code  4556
Country  Australia
Electronic mail address  lachlan.mckinna@go2q.com.au
Cited responsible party
Individual name  Fabricius, Katharina, Dr
Organisation name  Australian Institute of Marine Science
Role  coInvestigator: one of the key parties responsible for gathering information and conducting research
Contact Information
Contact
Phone
Telephone
Voice  +61 7 4753 4412
Address
Address
Delivery point  PRIVATE MAIL BAG 3, TOWNSVILLE MAIL CENTRE
City  Townsville
Administrative area  Queensland
Postal code  4810
Country  Australia
Electronic mail address  f.fabricius@aims.gov.au
Cited responsible party
Individual name  Garcia, Rodrigo
Organisation name  University of Massachusetts, Boston USA
Role  coInvestigator: one of the key parties responsible for gathering information and conducting research
Contact Information
Contact
Address
Address
Electronic mail address  rodrigo.garcia@umb.edu
Abstract 

This dataset contains estimated daily integrated benthic photosynthetically active radiation (bPAR) in the Great Barrier Reef Marine Park and Coral Sea for each day from July 2007 through to December 2019. Data are provided on a 1km grid.

The amount of light available for photosynthesis (photosynthetically active radiation, or PAR) is an important determinant of ecosystem health. PAR reaching the bottom of the water column is known as benthic PAR (bPAR). Where there is sufficient light reaching the bottom, seagrasses and corals may thrive. bPAR varies seasonally as a function of surface PAR, but also varies function of both water depth and water quality.

This data product was developed through NESP TWQ projects 2.3.1 and 5.3 as a first step in developing an ecologically relevant water quality indicator based on benthic light.

Methods:

Daily benthic light (bPAR) is derived from NASA MODIS Ocean Color data in combination with bathymetric data from Beaman (2010) using the algorithm described by Magno-Canto et al. (2019).

Ocean colour observations are used to estimate inherent optical properties (absorption and backscattering) at each of ten MODIS wavelengths, using the SWIM algorithm of McKinna et al. (2015). These in turn are used to calculate spectrally-resolved light attenuation (Kd). The Beer-Lambert equation is then used to propagate surface PAR down to the depth of the bottom of the water column using the bathymetry (i.e. depth map) provided by Beaman (2010). This yields an estimate of instantaneous bPAR on a 1km grid scale across the study region.

Instantaneous bPAR is then used to calculate daily integrated benthic light by considering the path and angle of the sun over the course of each day, assuming constant atmospheric conditions within each day.

A full description of the method can be found in this publication:

Magno-Canto, M.M., McKinna, L.I., Robson, B.J. and Fabricius, K.E., 2019. Model for deriving benthic irradiance in the Great Barrier Reef from MODIS satellite imagery. Optics express, 27(20), pp.A1350-A1371.

Limitations of the data:

This data set has gaps where atmospheric conditions such as cloud cover and sun angle precluded clear ocean colour observation at the time of the daily MODIS satellite over-pass.

The holes between the data points are due to a long-standing issue with the degradation of the sensors on the MODIS satellites.

While the data have been evaluated against in situ observed PAR at four sites within the Great Barrier Reef with good results, its accuracy has not been evaluated in muddy nearshore waters or deeper offshore waters.

Format:

This dataset consists of a collection of 18 netcdf files, one for each year between 2002 and 2019, inclusive. Each netCDF files contain a variable, “parb”, which is daily integrated downwelling photosynthetically available radiation at the sea floor in Einsteins per square metre per day, along with dimensions “latitude”, “longitude” and “time” (to the nearest day).

References:

Beaman, R., 2010. Project 3DGBR: A high-resolution depth model for the Great Barrier Reef and Coral Sea, Marine and Tropical Sciences Research Facility (MTSRF) Project 2.5i.1a, Final Report, Reef and Rainforest Research Centre.

Magno-Canto, M.M., McKinna, L.I., Robson, B.J. and Fabricius, K.E., 2019. Model for deriving benthic irradiance in the Great Barrier Reef from MODIS satellite imagery. Optics express, 27(20), pp.A1350-A1371.

McKinna, L.I., Fearns, P.R., Weeks, S.J., Werdell, P.J., Reichstetter, M., Franz, B.A., Shea, D.M. and Feldman, G.C., 2015. A semianalytical ocean color inversion algorithm with explicit water column depth and substrate reflectance parameterization. Journal of Geophysical Research: Oceans, 120(3), pp.1741-1770.

Robson, B., Canto, M., Collier, C., di Perna, S. and Logan, M., 2019. Benthic light as ecologically-validated GBR-wide indicator for water quality. NESP Tropical Water Quality Research Hub.

Data Location:

This dataset is filed in the eAtlas enduring data repository at: data\nesp5\5.3_Benthic-light

Point of contact
Individual name  Robson, Barbara, Dr
Organisation name  Australian Institute of Marine Science (AIMS)
Role  pointOfContact: party who can be contacted for acquiring knowledge about or acquisition of the resource
Contact Information
Contact
Phone
Telephone
Voice  +61 7 4753 4324
Address
Address
Delivery point  PRIVATE MAIL BAG 3, TOWNSVILLE MAIL CENTRE
City  Townsville
Administrative area  Queensland
Postal code  4810
Country  Australia
Electronic mail address  b.robson@aims.gov.au
Website
OnLine resource  eAtlas portal
Resource constraints
Commons License
Current License
Jurisdiction: au Attribution 3.0 Australia Attribution 3.0 Australia
Language  English
Character set  utf8: 8-bit variable size UCS Transfer Format, based on ISO/IEC 10646
Topic category
Topic category code  biota
Extent
Extent
Description  Great Barrier Reef, Papua New Guinea and Coral sea, Australia
Geographic element
Polygon
POLYGON((152.64266019616130166 -26.01920743184962959,154.07969645635375855 -25.99443094460493242,153.45703125 -20.830078125,147.12890625 -17.490234375,145.810546875 -13.798828125,144.4921875 -12.83203125000000178,144.228515625 -9.84375,142.119140625 -9.931640625,142.3828125 -11.77734375,143.61328125000002842 -14.765625,144.755859375 -14.94140625,146.337890625 -19.599609375,148.447265625 -21.00585937500000355,152.64266019616130166 -26.01920743184962959))
Geographic element
Polygon
POLYGON((147.216796875 -9.931640625,152.314453125 -9.931640625,154.6875 -11.6015625,154.423828125 -12.3046875,147.216796875 -9.931640625))
Geographic element
Polygon
POLYGON((149.74365234375 -15.66650390625,147.67822265625 -16.3916015625,148.38134765625 -18.08349609375,152.73193359375 -19.44580078125,152.2265625 -17.0947265625,149.74365234375 -15.66650390625))
Temporal element
Temporal Extent (MCP)
Extent
Begin date  2002-07-04
End date  2019-12-31
Distribution and On-line Resource(s)
OnLine resource
OnLine resource  Point of truth URL of this metadata record
OnLine resource
OnLine resource  NESP TWQ 5.3 Project page
OnLine resource
OnLine resource  eAtlas THREDDS service (AIMS)
OnLine resource
Interactive Map  parb
(OGC-WMS Server: http://maps.eatlas.org.au/thredds/wms/NESP-TWQ-5-3_Benthic-light/xr_parb/orig/xr_parb_daily_monthly_2002-2019.nc?SRS=EPSG%3A3857 )
View in Google Earth  parb   View in Google Earth
OnLine resource
Interactive Map  parb
(OGC-WMS Server: http://maps.eatlas.org.au/thredds/wms/NESP-TWQ-5-3_Benthic-light/xr_parb/agg/xr_parb_daily?SRS=EPSG%3A3857 )
View in Google Earth  parb   View in Google Earth
OnLine resource
OnLine resource  Project 5.3 web site
OnLine resource
OnLine resource  Project 2.3.1 web site
OnLine resource
OnLine resource  Link to THREDDS Data Server: 20 nc files daily bPar for years 2002 - 2019 + bathymetry
OnLine resource
OnLine resource  NESP TWQ 2.3.1 Project page
OnLine resource
OnLine resource  Interactive map
Data quality info
Data quality
Scope
Scope
Hierarchy level  dataset: information applies to the dataset
Metadata constraints
Commons License
Current License
Jurisdiction: au Attribution 3.0 Australia Attribution 3.0 Australia
Metadata Info
File identifier  356e7b3c-1508-432e-9d85-263ec8a67cef
Metadata language  English
Character set  utf8: 8-bit variable size UCS Transfer Format, based on ISO/IEC 10646
Parent identifier  National Environmental Science Program Tropical Water Quality (NESP TWQ) Hub - Funding Program - 2015 - 2020 (Dept. of the Environment and Energy)
Hierarchy level  dataset: information applies to the dataset
Contact
Individual name  eAtlas Data Manager
Organisation name  Australian Institute of Marine Science (AIMS)
Role  metadataContact: party who can be contacted about the metadata
Contact Information
Contact
Phone
Telephone
Voice  +61 7 4753 4444
Address
Address
Delivery point  PRIVATE MAIL BAG 3, TOWNSVILLE MAIL CENTRE
City  Townsville
Administrative area  Queensland
Postal code  4810
Country  Australia
Electronic mail address  e-atlas@aims.gov.au
Website
OnLine resource  eAtlas portal
Date stamp  2020-10-23T08:38:22
Metadata standard name  Australian Marine Community Profile of ISO 19115:2005/19139
Metadata standard version  1.4
Revision Date  2020-10-23T08:38:22