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On the link between the subseasonal evolution of the North Atlantic Oscillation and East Asian climate
Stockholm University, Faculty of Science, Department of Meteorology . Met Office Hadley Centre, UK.
2018 (English)In: Climate Dynamics, ISSN 0930-7575, E-ISSN 1432-0894, Vol. 51, no 9-10, p. 3537-3557Article in journal (Refereed) Published
Abstract [en]

We analyse the impact of the North Atlantic Oscillation (NAO) on the climate of East Asia at subseasonal time scales during both winter and summer. These teleconections have mainly been investigated at seasonal and longer time scales, while higher-frequency links are largely unexplored. The NAO is defined using extended empirical orthogonal functions on pentad-mean observations, which allows to elucidate the oscillation’s spatial and temporal evolution and clearly separate the development and decay phases. The downstream dynamical imprint and associated temperature and precipitation anomalies are quantified by means of a linear regression analysis. It is shown that the NAO generates a significant climate response over East Asia during both the dry and wet seasons, whose spatial pattern is highly dependent on the phase of the NAO’s life cycle. Temperature and precipitation anomalies develop concurrently with the NAO mature phase, and reach maximum amplitude 5–10 days later. These are shown to be systematically related to mid and high-latitude teleconnections across the Eurasian continent via eastward-propagating quasi-stationary Rossby waves instigated over the Atlantic and terminating in the northeastern Pacific. These findings underscore the importance of rapidly evolving dynamical processes in governing the NAO’s downstream impacts and teleconnections with East Asia.

Place, publisher, year, edition, pages
2018. Vol. 51, no 9-10, p. 3537-3557
Keywords [en]
North Atlantic Oscillation, East Asian monsoon, Teleconnections, Precipitation, Extended empirical orthogonal functions
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-161537DOI: 10.1007/s00382-018-4095-5ISI: 000447366100021OAI: oai:DiVA.org:su-161537DiVA, id: diva2:1259504
Available from: 2018-10-30 Created: 2018-10-30 Last updated: 2018-11-12Bibliographically approved

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CiteExportLink to record
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  • apa
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  • de-DE
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