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

Dev Niyogi, Hsin I. Chang, V. K. Saxena, Teddy Holt, Kiran Alapaty, Fitzgerald Booker, Fei Chen, Kenneth J. Davis, Brent Holben, Toshihisa Matsui, Tilden Meyers, Walter C. Oechel, Roger A. Pielke, Randy Wells, Kell Wilson, Yongkang Xue

Research output: Contribution to journalArticlepeer-review

147 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)L20506 1-5
JournalGeophysical Research Letters
Volume31
Issue number20
DOIs
StatePublished - Oct 28 2004

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Fingerprint

Dive into the research topics of 'Direct observations of the effects of aerosol loading on net ecosystem CO<sub>2</sub> exchanges over different landscapes'. Together they form a unique fingerprint.

Cite this