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Extending the record of photosynthetic activity in the eastern United States into the presatellite period using surface diurnal temperature range
Authors
Barford
Bishop
+21 more
Bonfils
Chen
Choudhury
Collatz
Céline Bonfils
Dai
Durre
Foley
Hansen
Kalnay
Kalnay
Kaufmann
Leathers
Levis
Pan
Randerson
Randerson
Schwartz
Schwartz
Stanhill
Tucker
Publication date
1 January 2005
Publisher
'American Geophysical Union (AGU)'
Doi
Cite
Abstract
Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 32 (2005): L08405, doi:10.1029/2005GL022583.In this study, we demonstrate that mid-latitude surface measurements of diurnal temperature range (DTR) can be used to reconstruct decadal variability of regional-scale terrestrial photosynthetic activity 1) during and prior to the period with satellite retrievals of land greenness and 2) without the need for moisture data. While the two relative maxima present in the seasonal evolution of DTR can determine the beginning and the end of the growing season, the summertime average DTR can be used as a proxy of summertime terrestrial photosynthesis. In a case study in the eastern United States (1966–1997), the DTR reconstructions indicate significant natural decadal variability in photosynthetic activity, but no secular, long-term trend. The summertime photosynthesis was found to be controlled primarily by moisture availability. Also, contrary to existing model parameterizations, the timing of spring onset was found to depend on both temperature and moisture.This work is supported by National Science Foundation grant ATM-9987457, NASA EOS-IDS grants NAG5-9514 and NNG04GK34G, NASA Carbon Cycle Program grant NAG5-11200, and the WHOI Ocean and Climate Change Institute
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