Stratosphere–Troposphere Coupling and Links with Eurasian Land Surface Variability
- 1 November 2007
- journal article
- Published by American Meteorological Society in Journal of Climate
- Vol. 20 (21), 5335-5343
- https://doi.org/10.1175/2007jcli1725.1
Abstract
A diagnostic of Northern Hemisphere winter extratropical stratosphere–troposphere interactions is presented to facilitate the study of stratosphere–troposphere coupling and to examine what might influence these interactions. The diagnostic is a multivariate EOF combining lower-stratospheric planetary wave activity flux in December with sea level pressure in January. This EOF analysis captures a strong linkage between the vertical component of lower-stratospheric wave activity over Eurasia and the subsequent development of hemisphere-wide surface circulation anomalies, which are strongly related to the Arctic Oscillation. Wintertime stratosphere–troposphere events picked out by this diagnostic often have a precursor in autumn: years with large October snow extent over Eurasia feature strong wintertime upward-propagating planetary wave pulses, a weaker wintertime polar vortex, and high geopotential heights in the wintertime polar troposphere. This provides further evidence for predictability of wintertime circulation based on autumnal snow extent over Eurasia. These results also raise the question of how the atmosphere will respond to a modified snow cover in a changing climate.Keywords
This publication has 23 references indexed in Scilit:
- Improved Skill of Northern Hemisphere Winter Surface Temperature Predictions Based on Land–Atmosphere Fall AnomaliesJournal of Climate, 2007
- The NAO, the AO, and Global Warming: How Closely Related?Journal of Climate, 2005
- Can knowledge of the state of the stratosphere be used to improve statistical forecasts of the troposphere?Quarterly Journal of the Royal Meteorological Society, 2003
- Stratospheric Memory and Skill of Extended-Range Weather ForecastsScience, 2003
- A Large-Ensemble Model Study of the Wintertime AO–NAO and the Role of Interannual Snow PerturbationsJournal of Climate, 2002
- A dynamical framework to understand and predict the major Northern Hemisphere modeGeophysical Research Letters, 2002
- Stratospheric Harbingers of Anomalous Weather RegimesScience, 2001
- The role of the Siberian high in northern hemisphere climate variabilityGeophysical Research Letters, 2001
- Northern Hemisphere Snow Cover Variability and Change, 1915–97Journal of Climate, 2000
- Propagation of the Arctic Oscillation from the stratosphere to the troposphereJournal of Geophysical Research: Solid Earth, 1999