Climate Dynamics

, Volume 36, Issue 3, pp 695–710

Modeling the time-dependent response of the Asian summer monsoon to obliquity forcing in a coupled GCM: a PHASEMAP sensitivity experiment

  • Guang-Shan Chen
  • Zhengyu Liu
  • Steven C. Clemens
  • Warren L. Prell
  • Xiaodong Liu
Article

DOI: 10.1007/s00382-010-0740-3

Cite this article as:
Chen, GS., Liu, Z., Clemens, S.C. et al. Clim Dyn (2011) 36: 695. doi:10.1007/s00382-010-0740-3

Abstract

To study the time-dependent response of the Asian summer monsoon to obliquity forcing, we analyze a 284,000-year long transient simulation produced by a fully coupled global climate model (GCM) using a new phase mapping (PHASEMAP) approach. Here we focus on understanding the phase response of monsoonal circulation to insolation forcing at the Earth-orbital obliquity band (41 Kyr). Our results show that the East Asian summer monsoon (EASM) can be divided into two geographic regions: the North East Asian summer monsoon (NEASM) and the South East Asian summer monsoon (SEASM). The Indian summer monsoon (ISM) and the SEASM are in phase at the obliquity band, strengthened with an increase in obliquity from Obliquity minima (Omin) to Obliquity maxima (Omax). The NEASM is out of phase with the ISM and SEASM, weakened with an increase in obliquity from Omin to Omax. We hypothesize that the inverse phase between the NEASM and the ISM at the obliquity band results from an ISM–NEASM teleconnection linked to the formation mechanism of the Bonin High.

Keywords

Asian summer monsoonPhase mapOrbital forcingGlobal climate modelTime-dependent simulationTeleconnection

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Guang-Shan Chen
    • 1
    • 2
  • Zhengyu Liu
    • 2
  • Steven C. Clemens
    • 3
  • Warren L. Prell
    • 3
  • Xiaodong Liu
    • 1
  1. 1.SKLLQG, Institute of Earth EnvironmentChinese Academy of SciencesXi’anChina
  2. 2.Center for Climate ResearchUniversity of WisconsinMadisonUSA
  3. 3.Department of Geological SciencesBrown UniversityProvidenceUSA