Name: Coastal inorganic pollution

Display Field:

Type: Raster Layer

Geometry Type: null

Description: The impact of land-based anthropogenic drivers of change on ocean ecosystems was evaluated with a 4 step process. First, watershed boundaries were developed with an automated flow-accumulation process. Then, data for land-based drivers (nutrient input, non-point source organic and inorganic pollution, and direct impact of humans) were spatially distributed onto the landscape with ancillary data. Nutrient and non-point source organic pollution data came from Food and Agriculture Organization (FAO) national statistics and were distributed across landscapes in agricultural lands with dasymetric techniques. Non-point source inorganic pollution was modelled with global 1 km2 impervious surface area data under the assumption that most of this pollution comes from urban runoff. After that, values for these three anthropogenic drivers were then aggregated to the watershed and distributed to the pour point (i.e., stream and river mouths) for the watershed with raster statistics. 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 in the initial cell and then evenly distributes the remaining amount of driver in all adjacent and 'unvisited' cells, repeated until a minimum threshold is reached. This approach to modelling river plumes is diffusive and so allows drivers to wrap around headlands and islands, but does not account for nearshore advection that acts to push drivers in particular directions.

Definition Expression:

Copyright Text: National Center for Ecological Analysis and Synthesis, 735 State Street - Santa Barbara, California, USA. http://www.nceas.ucsb.edu/GlobalMarine

Default Visibility: false

MaxRecordCount: 0

Supported Query Formats: JSON, AMF

Min Scale: 200000000

Max Scale: 250000

Supports Advanced Queries: false

Supports Statistics: false

Has Labels: false

Can Modify Layer: false

Can Scale Symbols: false

Extent:

XMin: -2.0037507842788246E7
YMin: -3.0241283134644702E7
XMax: 2.0038748152307723E7
YMax: 3.0240971458386205E7
Spatial Reference: 102100  (3857)

Drawing Info:

N/A

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeNone

Type ID Field: null

Fields: None


Supported Operations:   Query   Generate Renderer   Return Updates