OSU Chlorophyll Climatology, MODIS Aqua, West US, July 2002-June 2013


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, 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 degree 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, 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.

Data and Resources

Metadata Date

Metadata Tags

GCMD Keywords

CF Standard Names

Online Access

OPeNDAP (DAP Client Access)

These data are available for access with an OPeNDAP client

OGC:WMS (OGC Web Map Service)

These data are available for access with an OGC WMS compatible client

Distribution Formats
  • OPeNDAP (Version: DAP/2.0 )
Distributor Oregon State University
Point of Contact Craig Risien
Oregon State University
crisien@coas.oregonstate.edu
Background Information (Background information from the source)
Originator Craig Risien
Oregon State University
crisien@coas.oregonstate.edu
Background Information (Background information from the source)
Dataset Point of Contact Bob Simons
NOAA NMFS SWFSC Environmental Research Division
+1 831-658-3205
bob.simons@noaa.gov
General Documentation
Associated Documentation Oregon State University
Date(s) creation: 2014-09-25
creation: 2014-09-25
creation: 2014-09-25
Use Limitations 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.
Time Period 2002-07-01T00:00:00Z to 2003-06-01T00:00:00Z
Spatial Bounding Box Coordinates N: 51.0° S: 22.0° E: -105.0° W: -135.0°
Theme keywords Uncategorized
  • aqua
  • atmospheric
  • chemistry
  • chlorophyll
  • climatology
  • coast
  • college
  • color
  • concentration
  • earth
  • fields
  • high
  • modis
  • ocean
  • ocean color
  • oceans
  • oregon
  • resolution
  • sciences
  • sea
  • seawater
  • state
  • u.s.
  • university
  • water
  • west
  • west coast

GCMD Science Keywords
  • Oceans > Ocean Chemistry > Chlorophyll

CF-26
  • time
  • altitude
  • latitude
  • longitude
  • concentration_of_chlorophyll_in_sea_water

Project keywords Uncategorized
  • Oregon State University

Use Constraints 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.
Lineage Statement Lineage statement not available.
Platforms
Ingestion Attributes
Instrument Attributes
Attribution Information
infoUrl http://cioss.coas.oregonstate.edu/CIOSS/Documents/Published_Reports/Risien_USWC-Sat-Climatology_5-8-14.pdf
CF related
standard_name_vocabulary CF Standard Name Table v70