Nonlinear impact of the Arctic Oscillation on extratropical surface air temperature

Son, Hye-Young, Park, Wonsun, Jeong, Jee-Hoon, Yeh, Sang-Wook, Kim, Baek-Min, Kwon, MinHo and Kug, Jong-Seong (2012) Nonlinear impact of the Arctic Oscillation on extratropical surface air temperature Journal of Geophysical Research: Atmospheres, 117 . D19102. DOI 10.1029/2012JD018090.

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Supplementary data:

Abstract

The Arctic Oscillation (AO) is the leading climate mode of sea level pressure (SLP) anomalies during cold season in the Northern Hemisphere. To a large extent, the atmospheric climate anomalies associated with positive and negative phases of the AO are opposite to each other, indicating linear impact. However, there is also significant nonlinear relationship between the AO and other winter climate variability. We investigate nonlinear impacts of the AO on surface air temperature (SAT) using reanalysis data and a multi-millennial long climate simulation. It is found that SAT response to the AO, in terms of both spatial pattern and magnitude, is almost linear when the amplitude of the AO is moderate. However, the response becomes quite nonlinear as the amplitude of the AO becomes stronger. First, the pattern shift in SAT depends on AO phase and magnitude, and second, the SAT magnitude depends on AO phase. In particular, these nonlinearities are distinct over the North America and Eurasian Continent. Based on the analyses of model output, we suggest that the nonlinear zonal advection term is one of the critical components in generating nonlinear SAT response, particularly over the North America.
Key Points:
- We investigate nonlinear impacts of the AO on surface air temperature
- The response becomes nonlinear for the strong AO events
- The nonlinear advection is a critical component for the nonlinear SAT response

Document Type: Article
Keywords: Arctic Oscillation; nonlinear impact; climate variability; climate dynamics; Climate change and variability; TIBETAN PLATEAU; UNITED-STATES; CLIMATE; VARIABILITY; EXTREMES; ASSOCIATION; DOWNSTREAM; CANADA; MODES; NAO
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
DOI etc.: 10.1029/2012JD018090
ISSN: 2169-8996
Projects: Future Ocean
Expeditions/Models:
Date Deposited: 06 Sep 2012 06:01
Last Modified: 19 Jan 2018 11:54
URI: http://eprints.uni-kiel.de/id/eprint/15141

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