Land-atmosphere coupling and diurnal temperature range over the contiguous United States

Details Land-atmosphere coupling and diurnal temperature range over the contiguous United States Land-atmosphere coupling and diurnal temperature range over the contiguous United States

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3606706z&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 6, CiteID L06706

Physics

7

Global Change: Land/Atmosphere Interactions (1218, 1843, 3322), Hydrology: Land/Atmosphere Interactions (1218, 1631, 3322), Hydrology: Energy Budgets, Hydrology: Evapotranspiration, Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513)

Scientific paper

Soil moisture influences on daily maximum (T max) and minimum (T min) temperatures, and thus the diurnal temperature range (DTR) in summer, are statistically quantified across the contiguous Unites States using soil moisture from the Global Land Data Assimilation System and observational temperatures. A soil moisture feedback parameter is computed based on lagged covariance ratios. Over the zone from California through the Midwest to the Southeast, the soil moisture exhibits a negative feedback on DTR mainly through its damping effect on T max. In contrast, a positive feedback on DTR dominates Arizona and New Mexico as the soil moisture exerts a stronger negative forcing on T min relative to T max. The feedback-induced variability accounts for typically 10-20% of the total DTR variance over regions where strong feedbacks are identified. The results provide a useful benchmark for evaluating climate model simulations, although the employed data and method have limitations that should be recognized.

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