Chl-a Average Annual Frequency of Anomalies, 2002-2013

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Abstract/Contents

Abstract
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. agriculture runoff) processes. This layer represents the annual average number of anomalies of Chlorophyll from 2002 – 2013, with values presented as fraction of a year. Monthly and 8-day, 4 km (0.0417 degree) spatial resolution data were obtained from the MODIS (moderate resolution imaging spectroradiometer) Aqua satellite from the NASA OceanColor Web (http://oceancolor.gsfc.nasa.gov/cms/).
Purpose
This layer was developed as part of a geospatial database of key anthropogenic pressures to coastal waters of the Main Hawaiian Islands for the Ocean Tipping Points project (http://oceantippingpoints.org/). Ocean tipping points occur when shifts in human use or environmental conditions result in large, and sometimes abrupt, impacts to marine ecosystems. The ability to predict and understand ocean tipping points can enhance ecosystem management, including critical coral reef management and policies to protect ecosystem services produced by coral reefs. The goal of the Ocean Tipping Points Hawaii case study was to gather, process and map spatial information on environmental and human-based drivers of coral reef ecosystem conditions.

Description

Type of resource cartographic, software, multimedia
Form Raster Dataset
Publisher Ocean Tipping Points Project
Publication date 2016
Language English
Digital origin born digital
Map data Scale not given. ; Custom projection W 160°24ʹ45ʺ--W 154°33ʹ47ʺ/N 22°25ʹ25ʺ--N 18°45ʹ16ʺW 160°24ʹ45ʺ--W 154°33ʹ48ʺ/N 22°25ʹ25ʺ--N 18°45ʹ18ʺ, Scale not given ; EPSG::4326

Creators/Contributors

Creator Ocean Tipping Points Project

Subjects

Subject Marine ecology
Subject Marine ecosystem management
Subject Marine ecosystem health
Subject Chlorophyll
Subject Coral reefs and islands
Subject Environmental impact analysis
Subject Climatic changes
Subject Coastal ecosystem health
Subject Hawaii
Subject Pacific Ocean
Subject 2002-2013
Subject Oceans
Subject Environment
Genre Geospatial data
Genre Cartographic dataset

Bibliographic information

Use limitation Please contact the Ocean Tipping Points project in advance of applying these data sets to project work so the PI can track and communicate data uses and ensure no duplicate efforts are underway. When applying these data for publication, please reference and cite the complete journal article, Wedding et al. 2017.
WGS84 Cartographics This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.
Location https://purl.stanford.edu/kk001jq8042

Access conditions

Use and reproduction
Please contact the Ocean Tipping Points project in advance of applying these data sets to project work so the PI can track and communicate data uses and ensure no duplicate efforts are underway. When applying these data for publication, please reference and cite the complete journal article, Wedding et al. 2017, http://oceantippingpoints.org/our-work/publications.
Copyright
Copyright ownership resides with the originator.

Preferred citation

Ocean Tipping Points Project. (2016). Chl-a Average Annual Frequency of Anomalies, 2002-2013. Ocean Tipping Points Project. Available at: http://purl.stanford.edu/kk001jq8042.

Collection

Ocean Tipping Points

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