Global Eutrophication Watch

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Dataset Specification

Specify the path to your monthly CHL asset below. The dataset should contain a variable named "chlor_a".

MODIS/Aqua Level-3 (Global)

Trend Detection Interval

Select the start/end year interval for trend detection.

Start year: 1998

End year:2024

CHL Composite Interval

The start/end date for computing the temporal composite of CHL.

Start date

End date

Select cutoff level

[mg/m^3]

Click a point on the map to update the chart or type in your lon/lat values and then press "enter".

Longitude:
Latitude:

Point Status :: LN

Chlorophyll-a (CHL) Annual Max Trend chlor_a Jan-00 Jan-05 Jan-10 Jan-15 Jan-20 Jan-25 0.0 0.5 1.0 1.5 Date CHL [mg/m^3]

Eutrophication Potential

LD
LN
LI
HD
HN
HI

The Global Eutrophication Watch is designed to allow users to perform a preliminary screening of coastal eutrophication potential (CEP) using satellite-derived chlorophyll (CHL) data. This update version (V2) of the App (202209) is bundled with MODIS/Aqua-derived CHL product (Global), SGLI/GCOM-C (250 m resolution dataset around Japan) and the YOC blended CHL dataset (a regional dataset in the Northwest Pacific region). Users are also able to provide a link to their own asset (dataset) of monthly CHL for the App to read.

The manuscript of this App introduces the terms (1) eutrophication potential: waters with both Low (L) or High (H) CHL levels and Increasing (I) trends (LI, HI); (2) eutrophic potential: waters with CHL levels above a given threshold (H); (3) oligotrophication potential: the opposite of eutrophication potential, waters both L or H but with Decreasing (D) CHL levels (LD, HD). LI and HI are of a particular interest as they indicate waters in a process of becoming eutrophic (LI) or a progression of an already eutrophic (HI) water body. For more detailed information please refer to the manuscript "Globally consistent assessment of coastal eutrophication" available from the link
https://doi.org/10.1038/s41467-021-26391-9

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