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Direct observations of the effects of aerosol loading on net ecosystem CO2 exchanges over different landscapes
Department of MEAS, North Carolina State University, Raleigh, North Carolina, USA
Department of MEAS, North Carolina State University, Raleigh, North Carolina, USA
Department of MEAS, North Carolina State University, Raleigh, North Carolina, USA
Department of MEAS, North Carolina State University, Raleigh, North Carolina, USA
University of North Carolina at Chapel Hill, Raleigh, North Carolina, USA
USDA-ARS Air Quality–Plant Growth and Development Unit, Raleigh, North Carolina, USA
National Center for Atmospheric Research, Boulder, Colorado, USA
Department of Meteorology, Pennsylvania State University, University Park, Pennsylvania, USA
NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA
Atmospheric Turbulence and Diffusion Division, National Oceanic and Atmospheric Administration, Oak Ridge, Tennessee, USA
San Diego State University, San Diego, California, USA
Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA
Department of Crop Science, North Carolina State University, Raleigh, North Carolina, USA
Atmospheric Turbulence and Diffusion Division, National Oceanic and Atmospheric Administration, Oak Ridge, Tennessee, USA
Department of Geography, University of California, Los Angeles, Los Angeles, California, USA
We present the first direct, multisite observations in support of the hypothesis that atmospheric aerosols affect the regional terrestrial carbon cycle. The daytime growing season (summer) CO2 flux observations from six sites (forest, grasslands, and croplands) with collocated aerosol and surface radiation measurements were analyzed for high and low diffuse radiation; effect of cloud cover; and effect of high and low aerosol optical depths (AOD). Results indicate that, aerosols exert a significant impact on net CO2 exchange, and their effect may be even more significant than that due to clouds. The response appears to be a general feature irrespective of the landscape and photosynthetic pathway. The CO2 sink increased with aerosol loading for forest and crop lands, and decreased for grassland. The cause for the difference in response between vegetation types is hypothesized to be canopy architecture.
Received 5 July 2004; accepted 29 September 2004; published 29 October 2004.
Citation: (2004), Direct observations of the effects of aerosol loading on net ecosystem CO2 exchanges over different landscapes, Geophys. Res. Lett., 31, L20506, doi:10.1029/2004GL020915.
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