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Drier summers cancel out the CO2 uptake enhancement induced by warmer springs

Summary: Drier summers cancel out the CO2 uptake
enhancement induced by warmer springs
A. Angert*
, S. Biraud*, C. Bonfils*, C. C. Henning*, W. Buermann*, J. Pinzon
, C. J. Tucker
, and I. Fung*
*Berkeley Atmospheric Sciences Center, University of California, Berkeley, CA 94720-4767; and National Aeronautics and Space Administration Goddard
Space Flight Center, Greenbelt, MD 20771
Edited by Christopher B. Field, Carnegie Institution of Washington, Stanford, CA, and approved June 14, 2005 (received for review March 1, 2005)
An increase in photosynthetic activity of the northern hemisphere
terrestrial vegetation, as derived from satellite observations, has
been reported in previous studies. The amplitude of the seasonal
cycle of the annually detrended atmospheric CO2 in the northern
hemisphere (an indicator of biospheric activity) also increased
during that period. We found, by analyzing the annually detrended
CO2 record by season, that early summer (June) CO2 concentrations
indeed decreased from 1985 to 1991, and they have continued to
decrease from 1994 up to 2002. This decrease indicates accelerating
springtime net CO2 uptake. However, the CO2 minimum concen-
tration in late summer (an indicator of net growing-season uptake)


Source: Alon, Angert - Institute of Earth Sciences, Hebrew University of Jerusalem


Collections: Geosciences