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

著者: Dev Niyogi, Hsin‐I Chang, V. K. Saxena, Teddy Holt, Kiran Alapaty, Fitzgerald L. Booker, Fei Chen, K. J. Davis, B. N. Holben, Toshihisa Matsui, Tilden P. Meyers, Walter C. Oechel, Roger A. Pielke, Randy Wells, Kell Wilson, Yongkang Xue - Geophysical Research Letters 2004 被引用: 233

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) CO 2 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 CO 2 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 CO 2 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.