Editorial Type:
Article
Article Type:
Research Article

Mechanisms of Arctic Surface Air Temperature Change in Response to the Madden–Julian Oscillation

Changhyun Yoo Department of Meteorology, The Pennsylvania State University, University Park, Pennsylvania

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Sukyoung Lee Department of Meteorology, The Pennsylvania State University, University Park, Pennsylvania

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Steven B. Feldstein Department of Meteorology, The Pennsylvania State University, University Park, Pennsylvania

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Print Publication:
01 Sep 2012
DOI:
https://doi.org/10.1175/JCLI-D-11-00566.1
Page(s):
5777–5790
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Abstract

Using lagged composites and projections with the thermodynamic energy equation, in this study the mechanisms that drive the boreal winter Arctic surface air temperature (SAT) change associated with the Madden–Julian oscillation (MJO) are investigated. The Wheeler and Hendon MJO index, which divides the MJO into 8 phases, where phase 1 (phase 5) corresponds to reduced (enhanced) convection over the Maritime Continent and western Pacific Ocean, is used. It is shown that the more zonally localized (uniform) tropical convective heating associated with MJO phase 5 (phase 1) leads to enhanced (reduced) excitation of poleward-propagating Rossby waves, which contribute to Arctic warming (cooling). Adiabatic warming/cooling, eddy heat flux, and the subsequent change in downward infrared radiation (IR) flux are found to be important for the Arctic SAT change. The adiabatic warming/cooling initiates the Arctic SAT change, however, subsequent eddy heat flux makes a greater contribution. The resulting SAT change is further amplified by alteration in downward IR. It is shown that changes in surface sensible and latent heat fluxes oppose the contribution by the above processes.

Current affiliation: Center for Atmosphere Ocean Science, Courant Institute, New York University, New York, New York.

Corresponding author address: Changhyun Yoo, Center for Atmosphere Ocean Science, Courant Institute, New York University, 251 Mercer Street, New York, NY 10012. E-mail: cyoo@cims.nyu.edu

Abstract

Using lagged composites and projections with the thermodynamic energy equation, in this study the mechanisms that drive the boreal winter Arctic surface air temperature (SAT) change associated with the Madden–Julian oscillation (MJO) are investigated. The Wheeler and Hendon MJO index, which divides the MJO into 8 phases, where phase 1 (phase 5) corresponds to reduced (enhanced) convection over the Maritime Continent and western Pacific Ocean, is used. It is shown that the more zonally localized (uniform) tropical convective heating associated with MJO phase 5 (phase 1) leads to enhanced (reduced) excitation of poleward-propagating Rossby waves, which contribute to Arctic warming (cooling). Adiabatic warming/cooling, eddy heat flux, and the subsequent change in downward infrared radiation (IR) flux are found to be important for the Arctic SAT change. The adiabatic warming/cooling initiates the Arctic SAT change, however, subsequent eddy heat flux makes a greater contribution. The resulting SAT change is further amplified by alteration in downward IR. It is shown that changes in surface sensible and latent heat fluxes oppose the contribution by the above processes.

Current affiliation: Center for Atmosphere Ocean Science, Courant Institute, New York University, New York, New York.

Corresponding author address: Changhyun Yoo, Center for Atmosphere Ocean Science, Courant Institute, New York University, 251 Mercer Street, New York, NY 10012. E-mail: cyoo@cims.nyu.edu
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