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Variability of the Northern Hemisphere polar stratospheric cloud potential: The role of North Pacific disturbances
SMHI, Research Department, Climate research - Rossby Centre.ORCID iD: 0000-0002-4226-8713
2009 (English)In: Quarterly Journal of the Royal Meteorological Society, ISSN 0035-9009, E-ISSN 1477-870X, Vol. 135, no 641, 1020-1029 p.Article in journal (Refereed) Published
Abstract [en]

The potential of the Arctic stratosphere to sustain the formation of Polar Stratospheric Clouds (PSCs) is a key factor in determining the amount of ozone destroyed each winter, and is often measured as a 'PSC volume'. The latter quantity has been shown to closely follow a near-linear compact relationship with winter-averaged column ozone loss, and displays a high variability from monthly to decadal time-scales. We examine the connection between meteorological conditions in the troposphere and the variability of lower polar stratospheric temperatures over the last four decades, and specifically, conditions leading to a high PSC volume. In addition to the well-established connection between the North Atlantic Oscillation (NAO) and the polar vortex, we demonstrate the large influence of precursory disturbances over the North Pacific and the Far East, the region of maximum climatological upward wave activity flux. Namely, very high monthly PSC volume (in the top 12%) predominantly follows the development of positive tropospheric height anomalies over the Far East, which lead to a weakening of the background planetary wave trough, and lessened upward wave activity flux into the stratosphere. Precursory anomalies over the Far East are reminiscent of East Asian monsoon amplification episodes. Copyright (C) 2009 Royal Meteorological Society

Place, publisher, year, edition, pages
2009. Vol. 135, no 641, 1020-1029 p.
Keyword [en]
stratosphere, ozone, climate variability, East Asian monsoon
National Category
Climate Research
Research subject
Climate
Identifiers
URN: urn:nbn:se:smhi:diva-623DOI: 10.1002/qj.409ISI: 000268222800015OAI: oai:DiVA.org:smhi-623DiVA: diva2:807258
Available from: 2015-04-23 Created: 2015-04-21 Last updated: 2016-05-24Bibliographically approved

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CiteExportLink to record
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Citation style
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