HR: 17:25h
AN: B52E-06    [PDF]
TI: Can we detect interannual variability of summertime terrestrial photosynthesis from climatic and hydrological markers?
AU: * Bonfils, C
EM: celine@atmos.berkeley.edu
AF: Berkeley Atmospheric Sciences Center, 307 McCone Hall MC-4767 University California Berkeley, Berkeley, CA 94720-4767 United States
AU: Fung, I
EM: inez@atmos.berkeley.edu
AF: Berkeley Atmospheric Sciences Center, 307 McCone Hall MC-4767 University California Berkeley, Berkeley, CA 94720-4767 United States
AU: Doney, S
EM: sdoney@whoi.edu
AF: Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution 360 Woods Hole Road, Wood Hole, MA 02543-1543 United States
AU: John, J
EM: jasmin@atmos.berkeley.edu
AF: Berkeley Atmospheric Sciences Center, 307 McCone Hall MC-4767 University California Berkeley, Berkeley, CA 94720-4767 United States
AB: Because plant physiology controls simultaneously the exchanges in carbon, energy and water between land surface and atmosphere, numerous climate variables are modified when changes in photosynthesis occur. Numerous models simulations or observations studies have already shown that a change in vegetation can strongly impact climate variables such as DTR (Diurnal Temperature Range) or Bowen ratio. We suggest that these atmospheric signals register not only vegetation's strong influence on climate, but they also constitute powerful proxies from which changes in photosynthesis activity could be quantified. We propose: (1) to identify the physical variables that can be used as "markers" of summertime photosynthesis variability using two long, pre-industrial simulations performed with the CCSM NCAR coupled global climate-carbon model; (2) to test the conditions under which the markers can be used; (3) to add a new dimension to this analysis in exploring ground-based and/or satellite measurements.
DE: 0315 Biosphere/atmosphere interactions
DE: 1615 Biogeochemical processes (4805)
DE: 1818 Evapotranspiration
DE: 1878 Water/energy interactions
DE: 3322 Land/atmosphere interactions
SC: Biogeosciences [B]
MN: 2003 Fall Meeting