Removing Circulation Effects to Assess Central US Land-Atmosphere Interactions in the CESM Large Ensemble

TitleRemoving Circulation Effects to Assess Central US Land-Atmosphere Interactions in the CESM Large Ensemble
Publication TypeJournal Article
Year of Publication2017
AuthorsMerrifield A., Lehner F., Xie SP, Deser C.
JournalGeophysical Research Letters
Volume44
Pagination9938-9946
Date Published2017/10
Type of ArticleArticle
ISBN Number0094-8276
Accession NumberWOS:000413921300047
Keywordsbiases; Clouds; cmip5 simulations; north-american climate; part i; sea-surface temperatures; soil-moisture; summer; united-states; variability
Abstract

Interannual variability of summer surface air temperature (SAT) in the central United States (U.S.) is influenced by atmospheric circulation and land surface feedbacks. Here a method of dynamical adjustment is used to remove the effects of circulation on summer SAT variability over North America in the Community Earth System Model Large Ensemble. The residual SAT variability is shown to reflect thermodynamic feedbacks associated with land surface conditions. In particular, the central U.S. is a hot spot of land-atmosphere interaction, with residual SAT accounting for more than half of the total SAT variability. Within the hot spot, residual SAT anomalies show higher month-to-month persistence through the warm season and a redder spectrum than dynamically induced SAT anomalies. Residual SAT variability in this region is also shown to be related to preseason soil moisture conditions, surface flux variability, and local atmospheric pressure anomalies.

DOI10.1002/2017gl074831
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