Climate Dynamics

, Volume 42, Issue 7–8, pp 2019–2031 | Cite as

The MJO and global warming: a study in CCSM4

  • Aneesh Subramanian
  • Markus Jochum
  • Arthur J. Miller
  • Richard Neale
  • Hyodae Seo
  • Duane Waliser
  • Raghu Murtugudde
Article

Abstract

The change in Madden–Julian oscillation (MJO) amplitude and variance in response to anthropogenic climate change is assessed in the 1° nominal resolution community climate system model, version 4 (CCSM4), which has a reasonable representation of the MJO characteristics both dynamically and statistically. The twentieth century CCSM4 run is compared with the warmest twenty-first century projection (representative concentration pathway 8.5, or RCP8.5). The last 20 years of each simulation are compared in their MJO characteristics, including spatial variance distributions of winds, precipitation and outgoing longwave radiation, histograms of event amplitude, phase and duration, and composite maps of phases. The RCP8.5 run exhibits increased variance in intraseasonal precipitation, larger-amplitude MJO events, stronger MJO rainfall in the central and eastern tropical Pacific, and a greater frequency of MJO occurrence for phases corresponding to enhanced rainfall in the Indian Ocean sector. These features are consistent with the concept of an increased magnitude for the hydrological cycle under greenhouse warming conditions. Conversely, the number of active MJO days decreases and fewer weak MJO events occur in the future climate state. These results motivate further study of these changes since tropical rainfall variability plays such an important role in the region’s socio-economic well being.

Keywords

MJO Climate change CCSM4 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Aneesh Subramanian
    • 1
  • Markus Jochum
    • 2
  • Arthur J. Miller
    • 1
  • Richard Neale
    • 3
  • Hyodae Seo
    • 4
  • Duane Waliser
    • 5
  • Raghu Murtugudde
    • 6
  1. 1.SIO, UCSDLa JollaUSA
  2. 2.Climate and Geophysics DivisionThe Niels Bohr InstituteCopenhagenDenmark
  3. 3.Climate and Global Dynamics DivisionNational Center for Atmospheric ResearchBoulderUSA
  4. 4.Physical Oceanography DepartmentWoods Hole Oceanographic InstitutionWoods HoleUSA
  5. 5.Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadenaUSA
  6. 6.Earth System Science Interdisciplinary CenterUniversity of MarylandCollege ParkUSA

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