Direct observations of the effects of aerosol loading on net ecosystem CO2 exchanges over different landscapes

Details Direct observations of the effects of aerosol loading on net ecosystem CO2 exchanges over different landscapes Direct observations of the effects of aerosol loading on net ecosystem CO2 exchanges over different landscapes

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3120506n&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 20, CiteID L20506

Physics

22

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Atmospheric Composition And Structure: Pollution-Urban And Regional (0305), Global Change: Atmosphere (0315, 0325), Global Change: Biogeochemical Processes (4805)

Scientific paper

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.

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