osu2ChlaAnom eng UTF8 dataset service Roy Mendelssohn NOAA NMFS SWFSC Environmental Research Division +1 831-420-3666 110 McAllister Road Santa Cruz CA 95060 USA erd.data@noaa.gov pointOfContact 2026-03-05 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) 4 column 2401 0.0125 row 2321 0.0125 vertical 1 temporal 254 2879544.6640316206 area OSU Chlorophyll Anomaly V2, MODIS Aqua, West US, 2003-present 2026-03-05 creation coastwatch.pfeg.noaa.gov osu2ChlaAnom Craig Risien Oregon State University - College of Earth, Ocean, and Atmospheric Sciences crisien@coas.oreognstate.edu ??? information web browser Background Information Background information from the source information originator U.S. West Coast Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua High Resolution Chlorophyll-a (CHLA) Anomaly Fields (July 2002 - March 2014). This suite of CHLA and Sea Surface Temperature (SST) climatology and anomaly data products are derived from daily, 0.0125 degree x 0.0125 degree, MODIS Aqua CHLA and SST fields that cover the California Current System (22N - 51N, 155W - 105W) for the 11-year period July 2002 through June 2013. These daily fields, obtained from the NOAA CoastWatch West Coast Regional Node website, were processed using a successive 3x3, 5x5 and 7x7 grid cell hybrid median filtering technique. This technique was found to effectively reduce noise in the daily fields while maintaining features and detail in important regions such as capes and headlands. The resulting median filtered daily fields were then linearly interpolated to a 0.025 x 0.025 degree grid and averaged to create 132 monthly mean fields. The seasonal cycles at each 0.025 degree x 0.025 degree grid cell were obtained by fitting each multiyear time series of monthly means to a nine-parameter regression model consisting of a constant plus four harmonics (frequencies of N/(1-year), N-1,4; Risien and Chelton 2008, Journal of Physical Oceanography (JPO)). Even with the median filtering and the temporal averaging of the daily fields, the highly inhomogeneous nature of the MODIS fields still resulted in regression coefficients that were excessively noisy. We therefore applied the same successive 3x3, 5x5 and 7x7 hybrid median filtering technique, described above, to the regression coefficients before finally spatially smoothing the coefficients using a loess smoother (Schlax et al. 2001, JTECH) with filter cutoff wavelengths of 0.25 degree latitude by 0.25 degree longitude. The seasonal cycles were then calculated from the filtered regression coefficients for each 0.025 degree x 0.025 degree grid cell using the mean and all four harmonics. It is important to note that THIS SUITE OF DATA PRODUCTS IS HIGHLY EXPERIMENTAL and is strictly intended for scientific evaluation by experienced marine scientists. Craig Risien Oregon State University - College of Earth, Ocean, and Atmospheric Sciences crisien@coas.oreognstate.edu ??? information web browser Background Information Background information from the source information pointOfContact anomaly aqua atmospheric chla chlorophyll chlorophyll-a coast coastwatch college color data earth fields high imaging journal jpo moderate modis noaa node ocean ocean color oceanography oregon physical regional resolution sciences sea spectroradiometer sst state surface temperature university US wcrn west west coast theme Oregon State University - College of Earth, Ocean, and Atmospheric Sciences project time altitude latitude longitude theme CF Standard Name Table v70 The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information. Oregon State University - College of Earth, Ocean, and Atmospheric Sciences largerWorkCitation project Unidata Common Data Model Grid largerWorkCitation project eng geoscientificInformation 1 -135.0 -105.0 22.0 51.0 seconds 2003-01-16T00:00:00Z 2026-02-16T00:00:00Z 0.0 0.0 OSU Chlorophyll Anomaly V2, MODIS Aqua, West US, 2003-present 2026-03-05 creation Craig Risien Oregon State University - College of Earth, Ocean, and Atmospheric Sciences crisien@coas.oreognstate.edu ??? information web browser Background Information Background information from the source information originator U.S. West Coast Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua High Resolution Chlorophyll-a (CHLA) Anomaly Fields (July 2002 - March 2014). This suite of CHLA and Sea Surface Temperature (SST) climatology and anomaly data products are derived from daily, 0.0125 degree x 0.0125 degree, MODIS Aqua CHLA and SST fields that cover the California Current System (22N - 51N, 155W - 105W) for the 11-year period July 2002 through June 2013. These daily fields, obtained from the NOAA CoastWatch West Coast Regional Node website, were processed using a successive 3x3, 5x5 and 7x7 grid cell hybrid median filtering technique. This technique was found to effectively reduce noise in the daily fields while maintaining features and detail in important regions such as capes and headlands. The resulting median filtered daily fields were then linearly interpolated to a 0.025 x 0.025 degree grid and averaged to create 132 monthly mean fields. The seasonal cycles at each 0.025 degree x 0.025 degree grid cell were obtained by fitting each multiyear time series of monthly means to a nine-parameter regression model consisting of a constant plus four harmonics (frequencies of N/(1-year), N-1,4; Risien and Chelton 2008, Journal of Physical Oceanography (JPO)). Even with the median filtering and the temporal averaging of the daily fields, the highly inhomogeneous nature of the MODIS fields still resulted in regression coefficients that were excessively noisy. We therefore applied the same successive 3x3, 5x5 and 7x7 hybrid median filtering technique, described above, to the regression coefficients before finally spatially smoothing the coefficients using a loess smoother (Schlax et al. 2001, JTECH) with filter cutoff wavelengths of 0.25 degree latitude by 0.25 degree longitude. The seasonal cycles were then calculated from the filtered regression coefficients for each 0.025 degree x 0.025 degree grid cell using the mean and all four harmonics. It is important to note that THIS SUITE OF DATA PRODUCTS IS HIGHLY EXPERIMENTAL and is strictly intended for scientific evaluation by experienced marine scientists. ERDDAP griddap 1 -135.0 -105.0 22.0 51.0 seconds 2003-01-16T00:00:00Z 2026-02-16T00:00:00Z 0.0 0.0 tight ERDDAPgriddapDatasetQueryAndAccess https://coastwatch.pfeg.noaa.gov/erddap/griddap/osu2ChlaAnom ERDDAP:griddap ERDDAP-griddap ERDDAP's griddap service (a flavor of OPeNDAP) for gridded data. Add different extensions (e.g., .html, .graph, .das, .dds) to the base URL for different purposes. download OSU Chlorophyll Anomaly V2, MODIS Aqua, West US, 2003-present 2026-03-05 creation Craig Risien Oregon State University - College of Earth, Ocean, and Atmospheric Sciences crisien@coas.oreognstate.edu ??? information web browser Background Information Background information from the source information originator U.S. West Coast Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua High Resolution Chlorophyll-a (CHLA) Anomaly Fields (July 2002 - March 2014). This suite of CHLA and Sea Surface Temperature (SST) climatology and anomaly data products are derived from daily, 0.0125 degree x 0.0125 degree, MODIS Aqua CHLA and SST fields that cover the California Current System (22N - 51N, 155W - 105W) for the 11-year period July 2002 through June 2013. These daily fields, obtained from the NOAA CoastWatch West Coast Regional Node website, were processed using a successive 3x3, 5x5 and 7x7 grid cell hybrid median filtering technique. This technique was found to effectively reduce noise in the daily fields while maintaining features and detail in important regions such as capes and headlands. The resulting median filtered daily fields were then linearly interpolated to a 0.025 x 0.025 degree grid and averaged to create 132 monthly mean fields. The seasonal cycles at each 0.025 degree x 0.025 degree grid cell were obtained by fitting each multiyear time series of monthly means to a nine-parameter regression model consisting of a constant plus four harmonics (frequencies of N/(1-year), N-1,4; Risien and Chelton 2008, Journal of Physical Oceanography (JPO)). Even with the median filtering and the temporal averaging of the daily fields, the highly inhomogeneous nature of the MODIS fields still resulted in regression coefficients that were excessively noisy. We therefore applied the same successive 3x3, 5x5 and 7x7 hybrid median filtering technique, described above, to the regression coefficients before finally spatially smoothing the coefficients using a loess smoother (Schlax et al. 2001, JTECH) with filter cutoff wavelengths of 0.25 degree latitude by 0.25 degree longitude. The seasonal cycles were then calculated from the filtered regression coefficients for each 0.025 degree x 0.025 degree grid cell using the mean and all four harmonics. It is important to note that THIS SUITE OF DATA PRODUCTS IS HIGHLY EXPERIMENTAL and is strictly intended for scientific evaluation by experienced marine scientists. OPeNDAP 1 -135.0 -105.0 22.0 51.0 seconds 2003-01-16T00:00:00Z 2026-02-16T00:00:00Z 0.0 0.0 tight OPeNDAPDatasetQueryAndAccess https://coastwatch.pfeg.noaa.gov/erddap/griddap/osu2ChlaAnom OPeNDAP:OPeNDAP OPeNDAP An OPeNDAP service for gridded data. Add different extensions (e.g., .html, .das, .dds) to the base URL for different purposes. download OSU Chlorophyll Anomaly V2, MODIS Aqua, West US, 2003-present 2026-03-05 creation Craig Risien Oregon State University - College of Earth, Ocean, and Atmospheric Sciences crisien@coas.oreognstate.edu ??? information web browser Background Information Background information from the source information originator U.S. West Coast Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua High Resolution Chlorophyll-a (CHLA) Anomaly Fields (July 2002 - March 2014). This suite of CHLA and Sea Surface Temperature (SST) climatology and anomaly data products are derived from daily, 0.0125 degree x 0.0125 degree, MODIS Aqua CHLA and SST fields that cover the California Current System (22N - 51N, 155W - 105W) for the 11-year period July 2002 through June 2013. These daily fields, obtained from the NOAA CoastWatch West Coast Regional Node website, were processed using a successive 3x3, 5x5 and 7x7 grid cell hybrid median filtering technique. This technique was found to effectively reduce noise in the daily fields while maintaining features and detail in important regions such as capes and headlands. The resulting median filtered daily fields were then linearly interpolated to a 0.025 x 0.025 degree grid and averaged to create 132 monthly mean fields. The seasonal cycles at each 0.025 degree x 0.025 degree grid cell were obtained by fitting each multiyear time series of monthly means to a nine-parameter regression model consisting of a constant plus four harmonics (frequencies of N/(1-year), N-1,4; Risien and Chelton 2008, Journal of Physical Oceanography (JPO)). Even with the median filtering and the temporal averaging of the daily fields, the highly inhomogeneous nature of the MODIS fields still resulted in regression coefficients that were excessively noisy. We therefore applied the same successive 3x3, 5x5 and 7x7 hybrid median filtering technique, described above, to the regression coefficients before finally spatially smoothing the coefficients using a loess smoother (Schlax et al. 2001, JTECH) with filter cutoff wavelengths of 0.25 degree latitude by 0.25 degree longitude. The seasonal cycles were then calculated from the filtered regression coefficients for each 0.025 degree x 0.025 degree grid cell using the mean and all four harmonics. It is important to note that THIS SUITE OF DATA PRODUCTS IS HIGHLY EXPERIMENTAL and is strictly intended for scientific evaluation by experienced marine scientists. Open Geospatial Consortium Web Map Service (WMS) 1 -135.0 -105.0 22.0 51.0 seconds 2003-01-16T00:00:00Z 2026-02-16T00:00:00Z 0.0 0.0 tight GetCapabilities https://coastwatch.pfeg.noaa.gov/erddap/wms/osu2ChlaAnom/request?service=WMS&version=1.3.0&request=GetCapabilities OGC:WMS OGC-WMS Open Geospatial Consortium Web Map Service (WMS) download physicalMeasurement chla_anomaly float Chla Anomaly Roy Mendelssohn NOAA NMFS SWFSC Environmental Research Division +1 831-420-3666 110 McAllister Road Santa Cruz CA 95060 USA erd.data@noaa.gov distributor OPeNDAP DAP/2.0 https://coastwatch.pfeg.noaa.gov/erddap/griddap/osu2ChlaAnom.html order Data Subset Form ERDDAP's version of the OPeNDAP .html web page for this dataset. Specify a subset of the dataset and download the data via OPeNDAP or in many different file types. download https://coastwatch.pfeg.noaa.gov/erddap/griddap/osu2ChlaAnom.graph order Make-A-Graph Form ERDDAP's Make-A-Graph .html web page for this dataset. Create an image with a map or graph of a subset of the data. mapDigital This record was created from dataset metadata by ERDDAP Version 2.29.0