| dataFormat | NetCDF |
| authority | gov.noaa.pfeg.coastwatch |
| featureType | Grid |
| id | satellite/OSU2/chlaAnom |
Dataset: chlaAnom
Catalog: Oceanwatch THREDDS Data Server
Access:
| Service | Type | Description |
|---|---|---|
| OPENDAP | Data Access | Access dataset through OPeNDAP using the DAP2 protocol. |
| WCS | Data Access | Supports access to geospatial data as 'coverages'. |
| WMS | Data Access | Supports access to georegistered map images from geoscience datasets. |
| NetcdfSubset | Data Access | A web service for subsetting CDM scientific grid datasets. |
| NCML | Metadata | Provide NCML representation of a dataset. |
| UDDC | Metadata | An evaluation of how well the metadata contained in the dataset conforms to the NetCDF Attribute Convention for Data Discovery (NACDD) |
| ISO | Metadata | Provide ISO 19115 metadata representation of a dataset's structure and metadata. |
Viewers:
| Viewer | Type | Description |
|---|---|---|
| Godiva3 | Browser | |
| default_viewer.ipynb | Jupyter Notebook | The TDS default viewer attempts to plot any Variable contained in the Dataset. |
Description:
- Summary: This suite of CHLA and 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, 135W - 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 averaged to create monthly mean fields. The seasonal cycles at each 0.0125 degree x 0.0125 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, 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 0.0125 degree x 0.0125 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.
- Rights: 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, CoastWatch, 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.
Publishers:
-
Pacific Fisheries Environmental Laboratory
- email: roy.mendelssohn@noaa.gov
- http://oceanwatch.pfeg.noaa.gov
Variables:
- Vocabulary [
CF-1.6]:
- altitude (m) = altitude = altitude
- chla_anomaly (mg m-3) = Chlorophyll-a Concentration Anomaly, EXPERIMENTAL = concentration_of_chlorophyll_in_sea_water_anomaly
- lat (degrees_north) = lat = latitude
- lon (degrees_east) = lon = longitude
- time (days since 1970-01-01T00:00:00Z) = time = time
GeospatialCoverage:
- Longitude: -135.0 to -105.0 Resolution=0.0125 degrees_east
- Latitude: 22.0 to 51.0 Resolution=0.0125 degrees_north
TimeCoverage:
- Start: 2002-07-01T00:00:00Z
- End: 2014-03-01T00:00:00Z
- Duration: 11.666 years