Underlying causes of Eurasian midcontinental aridity in simulations of mid-Holocene climate.

ABSTRACT: Climate model simulations uniformly show drier and warmer summers in the Eurasian midcontinent during the mid-Holocene, which is not consistent with paleoenvironmental observations. The simulated climate results from a reduction in the zonal temperature gradient, which weakens westerly flow and reduces moisture flux and precipitation in the midcontinent. As a result, sensible heating is favored over evaporation and latent heating, resulting in substantial surface-driven atmospheric warming. Thus, the discrepancy with the paleoenvironmental evidence arises initially from a problem in the simulated circulation and is exacerbated by feedback from the land surface. This region is also drier and warmer than indicated by observations in the preindustrial control simulations, and this bias arises

SUBMITTER: Bartlein PJ 

PROVIDER: S-EPMC5661745 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature