Physics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3419405z&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 19, CiteID L19405
Physics
5
Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions (0426, 1610), Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), Global Change: Impacts Of Global Change (1225), Global Change: Land Cover Change, Global Change: Remote Sensing (1855)
Scientific paper
Warming climates have been widely recognized to advance spring vegetation phenology. However, the delayed responses of vegetation phenology to rising temperature and their mechanisms are poorly understood. Using satellite and climate data from 1982 to 2005, we reveal a latitude transition zone of greenup onset in vegetation communities that has diversely responded to warming temperature in North America. From 40°N northwards, a winter chilling requirement for vegetation dormancy release is far exceeded and the decrease in chilling days by warming winter temperature has little impact on thermal-time requirements for greenup onset. Thus, warming spring temperature has constantly advanced greenup onset by 0.32 days/year. However, from 40°N southward, the shortened winter chilling days are insufficient for fulfilling vegetation chilling requirement, so that the thermal-time requirement for greenup onset during spring increases gradually. Consequently, vegetation greenup onset changes progressively from an early trend (north region) to a later trend (south region) along the latitude transition zone from 40-31°N, where the switch occurs around 35°N. The greenup onset is delayed by 0.15 days/year below 31°N.
Sullivan Jerry T.
Tarpley Dan
Zhang Xiaoyang
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