Extending the record of photosynthetic activity in the eastern United States into the presatellite period using surface diurnal temperature range

Details Extending the record of photosynthetic activity in the eastern United States into the presatellite period using surface diurnal temperature range Extending the record of photosynthetic activity in the eastern United States into the presatellite period using surface diurnal temperature range

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3208405b&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 8, CiteID L08405

Physics

1

Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), Global Change: Water Cycles (1836), Hydrology: Evapotranspiration, Atmospheric Processes: Land/Atmosphere Interactions (1218, 1631, 1843), Geographic Location: North America

Scientific paper

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.

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