noaa national ocean service (nos) requirements for goes-r ocean color capability

NOAA National Ocean Service (NOS) Requirements for GOES-R Ocean Color CapabilityIntroductionNOAA’s coastal monitoring mission requires the GOES-R HES/Coastal Waters Imager to provide timely and reliable water quality information for ecosystem monitoring and management, and to address climate variability. To address the mission requirements, observations are needed for chlorophyll, suspended sediment, water clarity, and algal species. High spatial and temporal resolution measurements are needed at the following wavelengths: 412, 443, 490, 510, 555, 580, 610, 645, 667, 678, 709, 765 and 865 nm. Justification, demonstrated uses, and examples are shown below.

DetectHABS in Turbid Water

Ocean ColorApplicationsTo SupportNOS Mission

Monitor Water Clarity

Understand Climate Variability

SupportingVariables

Required WavelengthsTo Estimate Variables

DemonstratedUse

Light Attenuation

Chlorophyll in Clear water

FluorescenceLine Height

DetectBlue-Green Algae

Atmospheric Correction

Chlorophyll 555, 580, 610, 645

667, 678

Mean Chlorophyll for Monterey Bay National Marine Sanctuary 1997-2004

0.01.02.03.04.05.06.07.08.0

Oct-97

Jan-98

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date

chl (ug/L)

mean chl grand mean chl

443, 490, 510, 555

412, 443, 490, 667, 678, 709

CDOM and Chlorophyll Separator

490, 555

Sediment Load

555, 610, 645, 675

Examples from NOS regions of interest

Microcystis bloom in western basin of Lake Erie, 8/18/03. Source: www.epa.gov/2004update

Light attenuation Source: NASA/Goddard Space Flight Center and Orbimage

Eight-year time series of chlorophyll from SeaWiFS, over Monterey Bay National Marine Sanctuary. Source: Ojanen et al.

CDOM Absorption at 412 nm. Source: Gould et al.

Aircraft

CZCS, AVHRR, SeaWiFS, MODIS

MODIS, MERIS

SeaWiFS, MODIS

SeaWiFS

SeaWiFS, MODIS

709, 765, 865A Priori For AllWater Retrievals

SeaWiFS MODIS, MERIS

Washington and Oregon coastMERIS FLH

Source: Gower et al. MODIS FLH Source: Letelier et al.

Gulf of Mexico

The Great Lakes

MODIS Rrs640 (i.e. turbidity)Source: Ransibrahmanakul et al.

Low High US East Coast

US West Coast

US West Coast

Landsat-7Algae in Green BaySource: LakeSat.org

All atmospheric correction algorithms for ocean color rely on near IR bands to determine the amount and type of aerosol present. However, the Near IR is also contaminated by light scattered from sediment in the ocean, especially in the coastal zone. Three unknown quantities (total light from atmosphere, total light from water, and type of aerosol) require three channels to solve the atmospheric correction equation. The proposed channels for the GOES-R Coastal Waters Imager are 709, 765, and 865 nm.

Presenters:Varis Ransibrahmanakul,Richard P. Stumpf, both of NOAA NOS, and John J. Pereira of NOAA NESDIS.

Contact: Varis.Ransi@noaa.gov301 713 3028 x 142NOAA NOS, 1305 East-West Hwy, N/SCI rm 9111, Silver Spring, MD 20910