Role of tropical Pacific SSTs in global medieval hydroclimate

A modeling study

Robert Burgman, Richard Seager, Amy C Clement, Celine Herweijer

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The role of tropical Pacific SSTs in driving global medieval hydroclimate is assessed. Using fossil coral records from Palmyra Atoll, tropical Pacific sea surface temperature (SST) boundary conditions are derived for the period 1320-1462 A.D. These boundary conditions consist of La Nia-like mean state conditions in the tropical Pacific with inter-annual and decadal variability about that altered state. The reconstructed SSTs in the tropical Pacific are used to force a 16 member ensemble of atmospheric general circulation model (AGCM) simulations, coupled to a one layer ocean model outside of the tropical Pacific. The AGCM simulations of medieval climate are compared with modern climate simulations for the period 1856-2005 A.D. and are shown to reproduce many aspects of medieval hydroclimate found in paleo-proxy records for much of the Western Hemisphere, northern Eurasia, and the northern tropics. These results suggest that many features of global medieval hydroclimate changes can be explained by changes in tropical Pacific SSTs, though the potential role for other oceans is also discussed.

Original languageEnglish (US)
Article numberL06705
JournalGeophysical Research Letters
Volume37
Issue number6
DOIs
StatePublished - Mar 2010

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Medieval
Atmospheric General Circulation Models
sea surface temperature
climate
atmospheric general circulation model
Western hemisphere
boundary conditions
modeling
ocean models
boundary condition
simulation
coral record
fossils
tropical regions
atoll
oceans
ocean
fossil record
Northern Hemisphere

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

Role of tropical Pacific SSTs in global medieval hydroclimate : A modeling study. / Burgman, Robert; Seager, Richard; Clement, Amy C; Herweijer, Celine.

In: Geophysical Research Letters, Vol. 37, No. 6, L06705, 03.2010.

Research output: Contribution to journalArticle

Burgman, Robert ; Seager, Richard ; Clement, Amy C ; Herweijer, Celine. / Role of tropical Pacific SSTs in global medieval hydroclimate : A modeling study. In: Geophysical Research Letters. 2010 ; Vol. 37, No. 6.
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