Organic Pollution (pesticides) 2008 - KNB

Pesticides were used as a proxy measure for organic pollution. Input data are from FAO statistics published in the time period 2003-2006. Missing pesticide values were filled using a linear regression model of pesticides as a function of fertilizers (gaps: N=69; regression: R2 = 0.72) when fertilizer data were available or agricultural GDP (gaps: N=22; regression: R2 = 0.82) when not. These country-level average pesticides values were then dasymetrically distributed over a country’s landscape using global land cover data from 2005. 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 )
  • pesticides
Keywords ( Theme )
  • organic
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
2003-01-01
End date
2006-12-31
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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
6e945455-d26e-4e38-bee6-790b608275ad XML
Metadata language
en
Character set
UTF8
Date stamp
2017-11-09T17:14:44
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0
Point of contact
UN Environment-GRID - Antonio Benvenuti ( )

 
 

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W
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Keywords

ocean organic pesticides pollution raw stressors

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