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GLOBAL BIOGEOCHEMICAL CYCLES,
VOL. 23,
GB0A02,
13 PP., 2009
doi:10.1029/2008GB003281
Global patterns of dissolved silica export to the coastal zone: Results from a spatially explicit global model
Netherlands Environmental Assessment Agency, Bilthoven, Netherlands
Netherlands Environmental Assessment Agency, Bilthoven, Netherlands
Earth System Science and Climate Change Group, Wageningen University Research Centre, Wageningen, Netherlands
Department of Physical Geography, Utrecht University, Utrecht, Netherlands
Centre for Information Technology and Methodology, National Institute for Public Health and the Environment, Bilthoven, Netherlands
Institute of Biogeochemistry and Marine Chemistry, Hamburg University, Hamburg, Germany
Cluster of Excellence Integrated Climate System Analysis and Prediction, Hamburg University, Hamburg, Germany
We present a multiple linear regression model developed for describing global river export of dissolved SiO2 (DSi) to coastal zones. The model, with river basin spatial scale and an annual temporal scale, is based on four variables with a significant influence on DSi yields (soil bulk density, precipitation, slope, and area with volcanic lithology) for the predam situation. Cross validation showed that the model is robust with respect to the selected model variables and coefficients. The calculated global river export of DSi is 380 Tg a−1 (340–427 Tg a−1). Most of the DSi is exported by global rivers to the coastal zone of the Atlantic Ocean (41%), Pacific Ocean (36%), and Indian Ocean (14%). South America and Asia are the largest contributors (25% and 23%, respectively). DSi retention in reservoirs in global river basins may amount to 18–19%.
Received 9 June 2008; accepted 27 April 2009; published 1 August 2009.
Citation: (2009), Global patterns of dissolved silica export to the coastal zone: Results from a spatially explicit global model, Global Biogeochem. Cycles, 23, GB0A02, doi:10.1029/2008GB003281.
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