Journal article
Dissolved inorganic phosphorus export to the coastal zone: Results from a spatially explicit, global model
Global biogeochemical cycles, Vol.19(4), pp.GB4S03-n/a
12/2005
Handle:
https://hdl.handle.net/2376/105915
Abstract
Here we describe, test, and apply a spatially explicit, global model of river‐borne dissolved inorganic phosphorus (DIP) export called NEWS‐DIP. Among the innovations in NEWS‐DIP are increased spatial resolution (0.5 × 0.5°), explicit treatment of sewage, fertilizer, manure, and weathering P sources, and inclusion of reservoir retention and consumptive water use terms. The NEWS‐DIP model performed better than pre‐existing global models in predicting DIP yield for both calibration and validation basins (r2 = 0.72 and 0.56, respectively). NEWS‐DIP predicts that of the 34 Tg of P yr−1 loaded on watersheds by human activity globally, approximately 3% reaches river mouths as DIP; anthropogenic sources account for 65% (0.71 Tg yr−1) of the DIP exported to the coastal zone, with the remainder (0.38 Tg yr−1) attributable to natural weathering processes; DIP yields range over 5 orders of magnitude, from less than 0.01 to 1153 kg P km−2 yr−1 with highest predicted DIP yields clustering in East Asia, Europe, and Indonesia; human sewage is the largest anthropogenic source of DIP to the coastal zone on all continents and to all ocean basins. NEWS‐DIP also suggests that despite regional variability, at the global scale, non‐point sources of DIP such as inorganic P fertilizer and manure are much less important in determining coastal export of DIP than point sources and natural weathering processes.
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Details
- Title
- Dissolved inorganic phosphorus export to the coastal zone: Results from a spatially explicit, global model
- Creators
- John A Harrison - Rutgers–The State UniversitySybil P Seitzinger - Rutgers–The State UniversityA. F Bouwman - Netherlands Environmental Assessment Agency (MNP)Nina F Caraco - Institute of Ecosystem StudiesArthur H. W Beusen - Netherlands Environmental Assessment Agency (MNP)Charles J Vörösmarty - University of New Hampshire
- Publication Details
- Global biogeochemical cycles, Vol.19(4), pp.GB4S03-n/a
- Academic Unit
- Harrison Research Group: Global Change and Watershed Biochemistry ; Environment, School of the (CAS)
- Number of pages
- 15
- Identifiers
- 99900546785101842
- Language
- English
- Resource Type
- Journal article