Impact of the Ongoing Amazonian Deforestation on Local Precipitation: A GCM Simulation Study

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  • 1 Laboratory of Atmospheres, NASA/Goddard Space Flight Center, Greenbelt, Maryland
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Numerical simulation experiments were conducted to delineate the influence of in situ deforestation data on episodic rainfall by comparing two ensembles of five 5-day integrations performed with a recent version of the Goddard Laboratory for Atmospheres GCM that has a simple biosphere model (SiB). The first set, called control cases, used the standard SiB vegetation cover (comprising 12 biomes) and assumed a fully forested Amazonia, while the second set, called deforestation cases, distinguished the partially deforested regions of Amazonia as savanna. Except for this difference, all other initial and prescribed boundary conditions were kept identical in both sets of integrations. The differential analyses of these five cases show the following local effects of deforestation.

*Current affiliation: General Sciences Corporation, Laurel, Maryland.

Corresponding author address: Dr. Y. C. Sud, Climate and Radiation Branch, Laboratory for Atmospheres, NASA/GSFC Code 913, Greenbelt, MD 20771.

Numerical simulation experiments were conducted to delineate the influence of in situ deforestation data on episodic rainfall by comparing two ensembles of five 5-day integrations performed with a recent version of the Goddard Laboratory for Atmospheres GCM that has a simple biosphere model (SiB). The first set, called control cases, used the standard SiB vegetation cover (comprising 12 biomes) and assumed a fully forested Amazonia, while the second set, called deforestation cases, distinguished the partially deforested regions of Amazonia as savanna. Except for this difference, all other initial and prescribed boundary conditions were kept identical in both sets of integrations. The differential analyses of these five cases show the following local effects of deforestation.

*Current affiliation: General Sciences Corporation, Laurel, Maryland.

Corresponding author address: Dr. Y. C. Sud, Climate and Radiation Branch, Laboratory for Atmospheres, NASA/GSFC Code 913, Greenbelt, MD 20771.
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