HR: 11:20h
AN: A32B-05 [Abstracts]
TI: Direct Observations of the Aerosols Effects on Terrestrial Carbon and Water Cycles
AU: * Niyogi, D
EM: niyogi@gmail.com
AF: Department of Marine, Earth, Atmos. Sciences, North Carolina State Univ., Raleigh, NC 27695
United States
AU: Chang, H
EM: hchang3@ncsu.edu
AF: Department of Marine, Earth, Atmos. Sciences, North Carolina State Univ., Raleigh, NC 27695
United States
AU: Saxena, V K
EM: saxena@eos.ncsu.edu
AF: Department of Marine, Earth, Atmos. Sciences, North Carolina State Univ., Raleigh, NC 27695
United States
AU: Holt, T
EM: holt@nrlmry.navy.mil
AF: Department of Marine, Earth, Atmos. Sciences, North Carolina State Univ., Raleigh, NC 27695
United States
AU: Holt, T
EM: holt@nrlmry.navy.mil
AF: Naval Research Laboratory, Marine Meteorology Division, 7 Grace Hooper Ave., Monterey, CA 93943
United States
AU: Pielke, R A
EM: pielke@atmos.colostate.edu
AF: Department of Atmospheric Sciences, Colorado State University, Ft. Collins, CO 80523
United States
AU: Matsui, T
EM: matsuit@atmos.colostate.edu
AF: Department of Atmospheric Sciences, Colorado State University, Ft. Collins, CO 80523
United States
AU: Alapaty, K
EM: alapaty@email.unc.edu
AF: University of North Carolina at Chapel Hill, currently with National Science Foundation, Arlington, VA
22230
United States
AU: Booker, F
EM: fbooker@mindspring.com
AF: USDA ARS, Air Quality-Plant Growth and Development Unit, Raleigh, NC 27606
United States
AU: Chen, F
EM: feichen@ucar.edu
AF: National Center for Atmospheric Research, RAP, Boulder, 80307
United States
AU: Davis, K J
EM: davis@met.psu.edu
AF: Department of Meteorology,, Penn State University, University Park, PA 16802
United States
AU: Holben, B
EM: holben@aeronet.gsfc.nasa.gov
AF: GSFC, NASA, Greenbelt, MD 20771
United States
AU: Meyers, T
EM: tilden.meyers@noaa.gov
AF: ATDD/NOAA, P.O.Box 2456, Oak Ridge, TN 37830
United States
AU: Oechel, W C
EM: oechel@sunstroke.sdsu.edu
AF: San Diego State University, Global Change Research Group, San Diego, CA 92182
United States
AU: Wells, R
EM: rwells@ncsu.edu
AF: Department of Crop Science, N. C. State University, Raleigh, NC 27695
United States
AU: Wilson, K
EM: wilson@atdd.noaa.gov
AF: ATDD/NOAA, P.O.Box 2456, Oak Ridge, TN 37830
United States
AU: Xue, Y
EM: yxue@geog.ucla.edu
AF: Department of Geography, UCLA, Los Angeles, CA 951524
United States
AB:
We present multisite observations in support of the hypothesis that atmospheric aerosols affect the regional terrestrial
carbon and water cycle. The daytime growing season (summer) Co2 and water vapor 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 and water vapor 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.
The water vapor - aerosol feedback is a more complex function of leaf area index and the surface soil moisture, and needs to
be considered in future assessment studies. Results from ongoing modeling studies to study the influence of aerosol - clouds
within the climate system including the biophysical response will also be presented.
UR: http://www4.ncsu.edu/ ~dsniyogi
DE: 1655 Water cycles (1836)
DE: 1818 Evapotranspiration
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0315 Biosphere/atmosphere interactions
DE: 0400 Biogeosciences
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting