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

Chlorophyll-a Maximum Monthly Climatological Mean, 2002-2013 - Hawaii

Metadata Updated: October 14, 2022

Chlorophyll-a is a widely used proxy for phytoplankton biomass and an indicator for changes in phytoplankton production. As an essential source of energy in the marine environment, the extent and availability of phytoplankton biomass can be highly influential for fisheries production and dictate trophic structure in marine ecosystems. Changes in phytoplankton biomass are predominantly effected by changes in nutrient availability, through either natural (e.g., turbulent ocean mixing) or anthropogenic (e.g., agricultural runoff) processes. This layer represents the maximum monthly climatological mean of chlorophyll-a (mg/m3) from 2002-2013. Monthly and 8-day 4-km (0.0417-degree) spatial resolution data were obtained from the MODIS (Moderate-resolution Imaging Spectroradiometer) Aqua satellite instrument from the NASA OceanColor website (

A quality control mask was applied to remove spurious data associated with shallow water, following Gove et al., 2013. Monthly climatologies were calculated from monthly time series using only full years over the Ocean Tipping Points (OTP) project time frame of interest (2002-2013), averaging for all same-months (e.g., January). Nearshore map pixels with no data were filled with values from the nearest neighboring valid offshore pixel by using a grid of points and the Near Analysis tool in ArcGIS then converting points to raster.

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 March 30, 2021
Metadata Created Date November 12, 2020
Metadata Updated Date October 14, 2022
Reference Date(s) March 14, 2017 (creation), March 14, 2017 (issued), March 14, 2017 (revision)
Frequency Of Update

Metadata Source

Harvested from ioos

Graphic Preview

Sample image.

Additional Metadata

Resource Type Dataset
Metadata Date March 30, 2021
Metadata Created Date November 12, 2020
Metadata Updated Date October 14, 2022
Reference Date(s) March 14, 2017 (creation), March 14, 2017 (issued), March 14, 2017 (revision)
Responsible Party National Center for Ecological Analysis and Synthesis (NCEAS) (Point of Contact)
Contact Email
Guid hi_otp_all_chlor_clim_max
Access Constraints
Bbox East Long -154.56326617912035
Bbox North Lat 22.42373568629166
Bbox South Lat 18.755036208219373
Bbox West Long -160.41246354980814
Coupled Resource [{"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}]
Frequency Of Update
Graphic Preview Description Sample image.
Graphic Preview File
Harvest Object Id 0bfc12fa-eed5-4af1-8568-e39f2da3e930
Harvest Source Id 54e15a6e-6dde-4c9c-a8f0-345cc0dfccfb
Harvest Source Title ioos
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-160.41246354980814, 18.755036208219373], [-154.56326617912035, 18.755036208219373], [-154.56326617912035, 22.42373568629166], [-160.41246354980814, 22.42373568629166], [-160.41246354980814, 18.755036208219373]]]}
Spatial Data Service Type Open Geospatial Consortium Web Coverage Service (WCS)
Spatial Reference System
Spatial Harvester True

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