Terrestrial Net Primary Production Predicted from MODIS Satellite Data from 2000-2009
Abstract
The CASA (Carnegie-Ames-Stanford) ecosystem model based on satellite greenness observations has been used to estimate monthly carbon fluxes in terrestrial ecosystems from 2000 to 2009. The CASA model was driven by NASA Moderate Resolution Imaging Spectroradiometer (MODIS) vegetation cover properties and large-scale (1-km resolution) disturbance events detected in the monthly time series data. This modeling framework has been implemented to estimate historical as well as current monthly patterns in plant carbon fixation, living biomass increments, and long-term decay of woody (slash) pools before, during, and after land cover disturbance events. For the terrestrial biosphere, predicted net primary production (NPP) flux for atmospheric carbon dioxide has varied notably from year-to-year, but was predicted to have increased overall in the regions of the high-latitude Northern Hemisphere, South Asia, Central Africa, and Western Amazon since the year 2000. Periodic declines in regional NPP levels were predicted for the western Untied States, the southern Amazon, and southern Africa. These CASA NPP results were found to be partially in contrast to other recently published global modeling trends for terrestrial NPP that appear to be highly sensitive to regional drying patterns. Nevertheless, impacts of severe droughts on terrestrial NPP, disturbance frequency, and net ecosystem production sinks for carbon in the CASA model are presently being investigated in greater detail.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2010
- Bibcode:
- 2010AGUFM.B41K..05P
- Keywords:
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- 0426 BIOGEOSCIENCES / Biosphere/atmosphere interactions;
- 0428 BIOGEOSCIENCES / Carbon cycling;
- 0429 BIOGEOSCIENCES / Climate dynamics;
- 0480 BIOGEOSCIENCES / Remote sensing