NOAA Okeanos Ocean Color Operational Production System and QA Monitoring Tool Overview

(Yan and Weng 2007)

2(a) Daily Chlorophyll Concentration 2(b) Bimonthly-mean Chlorophyll Concentration

2(d) New algal growth (Positive Chlorophyll Concentration Anomaly)

2(e) Suspended Sediment Proxy (Remote Sensing Reflectance at 667 nm)

2(c) Chesapeake Bay Daily Chlorophyll Concentration

2(f) Water Turbidity(Diffuse Attenuation Coefficient at 490 nm)

Satellites: Moderate Resolution Imaging Spectroradiometer (MODIS) Instruments: AQUA (Primary) and TERRA (Backup) Product Specifications

• Products: daily merged chlorophyll concentration (Chl-a) and remote sensing reflectance (Rrs667) ; bi-monthly (monthly) mean Chl-a and Rrs667; daily anomaly of Chl-a and Rrs667; daily Chl-a fronts and Kd490 • Format: GeoTiff, PNG, NetCDF4 • Coverage: Northeast (NE), Southeast (SE), Gulf of Mexico (GOM), Caribbean (CB), West Coast (WC), Alaska

(AK), East Tropical Pacific (EP), Great Lakes (GL), Hawaii (HI), Equatorial Atlantic (EA), North Atlantic (NA), and Pacific Basin (PB), Chesapeake Bay (CY)

• Format: HDF 4.1, GeoTiff, PNG, netCDF • Horizontal Resolution: 1 km • Timeliness: 12 hours • Algorithms: NASA NIR (SCW), NOAA NIR-SWIR (WCW), and Chlorophyll Frontal Algorithms (BOA)

Data Access: ftp://cw-okeanos.noaa.gov/pub/modis/

NOAA Okeanos Ocean Color Operational Products

Okeanos Ocean Color Products Web-Based QA Monitoring Tool (http://www.ospo.noaa.gov/Products/ocean/color/index.html)

∗Other Contributors: CoastWatch Team (CWAPS developer); NASA's Ocean Biology Processing Group (NASA L2gen Alg.); M. Wang (NOAA NIR-SWIR Alg.); I. Belkin (Chlorophyll Front Alg.). Acknowledgements: Thanks to M. Hopkins, C. Brown and N. Parsons for development, and L. Stathoplos and R. Lindsay for operational deployment of the first generation Okeanos system.

2(g) Chlorophyll Front (Magnitude)

Examples of products are shown in Figures 2(a) -(f).

# 3.18

ABSTRACT In recent years, the NOAA CoastWatch Okeanos Ocean Color (OC) Operational Production System

(OPS) has been providing a series of high quality ocean color operational products from MODIS/AQUA for our user communities, e.g., 1 km daily and bi-monthly mean chlorophyll concentrations, and chlorophyll concentration anomaly compared to 61-day averages, remote sensing reflectance at 667 nm, and chlorophyll fronts. The products have been beneficial in assessing water quality and tracking potentially harmful algal blooms in order to protect public health. For example, the chlorophyll concentration product has been used to understand and predict harmful algal blooms in the Gulf of Mexico by the NOAA CO-OPS. Recently, a new operational Quality Assurance (QA) monitoring tool has been developed in the Okeanos OPS, offering the capability of monitoring the availability and quality of operational ocean color (OC) products in near real time (NRT) mode. More importantly, MODIS products will be extended to the NPP Visible/Infrared Imager Radiometer Suite (VIIRS) in 2015. Therefore, it is expected that our future operational ocean color product system will offer additional valuable information for users.

An Example of Web-based QA Tool Function: Help Monitoring Suspicious Products Interactive Date & Region for Selected Option. (MODIS / Aqua NIR-SWIR Ocean Color Product Page)

The MODIS/Aqua NIR-SWIR ocean color products are derived by using the shortwave infrared (SWIR)-based atmospheric correction algorithm developed by the NOAA/NESDIS Center for Satellite Applications and Research (STAR). The products include chlorophyll concentration, remote sensing reflectance at 667 nm, water attenuation coefficient at 490 nm over 12 CoastWatch Regions-of-Interest, i.e., Northeast (NE), Southeast (SE), Gulf of Mexico (GOM), Caribbean (CB), West Coast (WC), Alaska (AK), East Tropical Pacific (EP), Equatorial Atlantic (EA), Great Lakes (GL), Hawaii (HI), North Atlantic (NA), and Pacific Basin (PB). Chlorophyll concentration provides an estimate of the live phytoplankton biomass in the surface layer. It is also referred to as the amount of the green pigment chlorophyll. The chlorophyll anomaly is generated when today's chlorophyll concentration data is compared to the bi-monthly mean. A positive anomaly indicates new algal growth. Bi-monthly mean values are averages calculated over 61 days. Daily Mean (w/Granules) | Anomaly | Bimonthly Mean

Chlorophyll Concentration (Chl-a): Bimonthly Mean

Introduction Ocean Color Satellite Instruments Satellite Remote Sensing Principle (PDF) NOAA Okeanos Operational Products Overview NOAA Okeanos Operational System Overview (PDF) Okeanos Ocean Color Products Access (FTP) Okeanos Documents (FTP) Okeanos Ocean Color Products MODIS / Aqua NIR-SWIR Chlorophyll Concentration Remote Sensing Reflectance Water Attenuation Coefficient MODIS / Aqua NASA L2gen NIR Chlorophyll Concentration Remote Sensing Reflectance MODIS / Aqua Chesapeake Bay Chlorophyll Concentration Remote Sensing Reflectance MODIS / Aqua Chlorophyll Fronts Magnitude | Direction MODIS / Terra NASA L2gen NIR (Backup) Chlorophyll Concentration Remote Sensing Reflectance MODIS / Aqua Ehux Bloom (Retired) 8-Day Composite Composite Calcite Concentration Statistics of Okeanos Ocean Color Products Histogram of Ocean Color Products MODIS/Aqua Chlorophyll-a MODIS/Aqua Remote Sensing Reflectance Time Series of Ocean Color Products MODIS/Aqua Chlorophyll-a MODIS/Aqua Remote Sensing Reflectance Monitoring of Ocean Color Products Anomaly Chlorophyll-a Characteristics Remote Sensing Reflectance Characteristics Okeanos System Performance Product Monitoring Additional Information OSPO Ocean Color Team Ocean Color-Related Links Other Links References Acknowledgments

Figure 1 (a) Okeanos OPS IT Architecture Figure 1 (b) Okeanos QA Tool Overview