Ground vs. surface air temperature trends: Implications for borehole surface temperature reconstructions

Details Ground vs. surface air temperature trends: Implications for borehole surface temperature reconstructions Ground vs. surface air temperature trends: Implications for borehole surface temperature reconstructions

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30l...9m&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 12, pp. 9-1, CiteID 1607, DOI 10.1029/2003GL017170

Physics

20

Global Change: Atmosphere (0315, 0325), Global Change: Solid Earth, Meteorology And Atmospheric Dynamics: Numerical Modeling And Data Assimilation, Meteorology And Atmospheric Dynamics: Mesospheric Dynamics, Meteorology And Atmospheric Dynamics: Paleoclimatology

Scientific paper

We have analyzed the relationship between surface air temperature (SAT), ground surface temperature (GST), and snow cover (SNC) over the terrestrial Northern Hemisphere based on general circulation model (GCM) simulations using GISS modelE forced with the observed SST and radiative forcing changes from 1951-1998. While SAT is the dominant influence on GST during the warm-season, it explains only half of the variance in GST during the cold-season, with SNC and pre-conditioning by prior warm-season SAT also exhibiting a sizeable and, in places, dominant influence. During a period of coincident surface warming and cold-season snowcover decrease in the model (1971-1998), mean GST increases are 0.2°C less than those in SAT, a consequence of greater exposure of the ground surface to winter cold air outbreaks. Interpretations of past SAT trends from borehole-based GST reconstructions may therefore be substantially biased by seasonal influences and snow cover changes.

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