Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Skip to content

OSU Chlorophyll Bloom Product, Aqua Modis, Northwest US, 2002-2015, Lon0360

Metadata Updated: June 10, 2023

This product was developed for the Oregon coast based on the observed change between running 8-day composite chlorophyll-a (CHL) data obtained by the MODerate Resolution Imaging Spectraradiometer aboard Aqua (MODIS-Aqua). This product was optimized to detect bloom onset via satellite in Oregon's coastal waters, a region typified by high frequency biological variance yet pervasive cloud cover (see McKibben et al. 2012, JGR-Oceans). The product is based on running relative differences between successive 8-day products. A current composite (an average of the previous 8 days) and a reference composite (an average of the 8-day period immediately preceding the current composite). The reference is differenced from the current, then the result is normalized to the reference. Resulting daily imagery highlights the geographic locations of greatest relative change observed between weekly average CHL, providing a way to track onset and advection of active blooms over time. Note the product is optimized to work best in the coastal waters of Oregon, although it is operational further offshore and to the north or south as satellite coverage permits (coverage is increasingly better to the south and worst further offshore and to the north of Oregon).The bloom product accessible from this page is based on the MODIS CHL product and shows the percent relative change in CHL over time. THIS IS AN EXPERIMENTAL PRODUCT - intended strictly for scientific evaluation by professional marine scientists.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources


Metadata Date September 4, 2022
Metadata Created Date July 21, 2022
Metadata Updated Date June 10, 2023
Reference Date(s) September 4, 2022 (creation)
Frequency Of Update

Metadata Source

Harvested from Pacific Fisheries Environmental Laboratory

Additional Metadata

Resource Type Dataset
Metadata Date September 4, 2022
Metadata Created Date July 21, 2022
Metadata Updated Date June 10, 2023
Reference Date(s) September 4, 2022 (creation)
Responsible Party Oregon State University (Point of Contact)
Contact Email
Guid osuBloomsModisChla_Lon0360
Access Constraints
Bbox East Long -121.0
Bbox North Lat 52.0
Bbox South Lat 34.0
Bbox West Long -134.0
Coupled Resource [{"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}]
Frequency Of Update
Harvest Object Id e8376c81-4ddd-49b9-9e18-d7c26846a433
Harvest Source Id 817069b7-5f4e-4664-9e6b-615af3dfcf2d
Harvest Source Title Pacific Fisheries Environmental Laboratory
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-134.0, 34.0], [-121.0, 34.0], [-121.0, 52.0], [-134.0, 52.0], [-134.0, 34.0]]]}
Spatial Data Service Type ERDDAP griddap
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2002-08-15T00:00:00Z
Temporal Extent End 2015-06-21T00:00:00Z

Didn't find what you're looking for? Suggest a dataset here.