Nutrient Pollution (fertilizers) 2013 - KNB

Input data are from 2007-2010 FAO statistics, the most recent available. FAO data on annual country-level fertilizer were used were available, averaged over the time periods. Missing values were filled using a linear regression model of fertilizers as a function of pesticides (gaps: N=4; regression: R2 = 0.72) when pesticide data were available or agricultural GDP (gaps: N=22; regression: R2 = 0.62) when not. These country-level average fertilizer values were then dasymetrically distributed over a country’s landscape using global land cover data from 2009, derived from the Moderate Resolution imaging Spectroradiometer (MODIS) instrument at ~500m resolution. Finally, spread of the driver values into coastal waters at each pour point was modelled with a cost-path surface on the basis of a decay function that assigns a fixed amount of the driver (0.5% of the value in the previous cell) in the initial cell and then evenly distributes the remaining amount of driver in all adjacent and ‘unvisited’ cells, repeated until a minimum threshold (0.05% of global maximum) is reached. This approach to modelling river plumes is diffusive and so allows drivers to wrap around headlands and islands.

Raw stressor data from "Benjamin Halpern, Melanie Frazier, John Potapenko, Kenneth Casey, Kellee Koenig, et al. 2015. Cumulative human impacts: raw stressor data (2008 and 2013). Knowledge Network for Biocomplexity. doi:10.5063/F1S180FS."

Simple

Date ( Publication )
2015-07-14
Status
Completed
Originator
Bren School of Environmental Science and Management, University of California, Santa Barbara, California 93106, USA - Benjamin S. Halpern ( )

Maintenance and update frequency
Unknown
Keywords ( Theme )
  • raw stressors
Keywords ( Place )
  • World
Keywords ( Theme )
  • fertilizers
Keywords ( Theme )
  • nutrients
Keywords ( Theme )
  • ocean
Keywords ( Theme )
  • pollution
Access constraints
License
Use constraints
License
Other constraints
Creative Commons CC-0 license
Spatial representation type
Grid
Denominator
1000000
Metadata language
en
Character set
UTF8
Topic category
  • Oceans
  • Environment
Begin date
2007-01-01
End date
2010-12-31
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S
E
W
thumbnail


Reference system identifier
WGS 1984
Distribution format
  • geotiff ( Not Set )

OnLine resource
Supplementary information ( WWW:LINK-1.0-http--link )
OnLine resource
Download original dataset_Mollweide ( WWW:DOWNLOAD-1.0-http--download )
OnLine resource
PNG8 ( OGC:WMS-1.3.0-http-get-map )
Hierarchy level
Dataset
Statement
Not set

Metadata

File identifier
8b2753f1-7868-4b36-8ba9-3e103784ba74 XML
Metadata language
en
Character set
UTF8
Date stamp
2017-11-09T17:10:26
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0
Point of contact
UNEnvironment-GRID - Antonio Benvenuti ( )

 
 

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S
E
W
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Keywords

fertilizers nutrients ocean pollution raw stressors

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