Maintenance Mechanism for the Teleconnection Pattern over the High Latitudes of the Eurasian Continent in Summer

Li, Xinyu, Lu, Riyu, Greatbatch, Richard John, Li, Gen and Hong, Xiaowei (2019) Maintenance Mechanism for the Teleconnection Pattern over the High Latitudes of the Eurasian Continent in Summer Journal of Climate . DOI 10.1175/JCLI-D-19-0362.1.

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Abstract

There is a zonally oriented teleconnection pattern over the high-latitude Eurasian continent, which is maintained through baroclinic energy conversion. In this study, we investigate the unique features of the maintenance mechanism of this teleconnection. It is found that the baroclinic energy conversion is most efficient in both the mid-troposphere and the lower troposphere, and that the baroclinic energy conversion in the lower troposphere is comparable to that in the mid-troposphere. Further results indicate that the basic state plays a crucial role in the baroclinic energy conversion. For both the mid and lower troposphere, the atmospheric stability is low and the Coriolis parameter is large over high-latitude Eurasia, favoring strong baroclinic energy conversion. Particularly, in the lower troposphere, the atmospheric stability exhibits a clear land-sea contrast, favoring baroclinic energy conversion over the continents rather than the oceans. Furthermore, in the lower troposphere, the in-phase configuration of the meridional wind and temperature anomalies, which results from the strong meridional gradient of mean temperature around the north edge of the Eurasian continent, also significantly contributes to baroclinic energy conversion. This study highlights the role of the basic state of temperature rather than zonal wind in maintaining the high-latitude teleconnection through baroclinic energy conversion.

Document Type: Article
Additional Information: This preliminary version has been accepted for publication in Journal of Climate, may be fully cited, and has been assigned DOI10.1175/JCLI-D-19-0362.1. The final typeset copyedited article will replace the EOR at the above DOI when it is published.
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-OD Ocean Dynamics
Refereed: Yes
DOI etc.: 10.1175/JCLI-D-19-0362.1
ISSN: 0894-8755
Date Deposited: 18 Nov 2019 08:36
Last Modified: 18 Nov 2019 08:36
URI: http://eprints.uni-kiel.de/id/eprint/48243

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