Polar vortex evolution during Northern Hemispheric winter 2004/05
نویسندگان
چکیده
منابع مشابه
Stratosphere-troposphere evolution during polar vortex intensification
[1] Stratosphere-troposphere evolution associated with polar vortex intensification (VI) events is examined during the Northern Hemisphere winter. The incipient stage of a VI event is marked by anomalously low wave activity and descending westerly anomalies over the depth of the polar stratosphere. Reduced poleward planetary wave heat flux occurs as the circumpolar wind becomes strongest and pr...
متن کاملVortex–Vortex Interactions in the Winter Stratosphere
This paper examines the interaction of oppositely signed vortices in the compressible (non-Boussinesq) quasigeostrophic system, with a view to understanding vortex interactions in the polar winter stratosphere. A series of simplifying approximations leads to a two-vortex system whose dynamical properties are determined principally by two parameters: the ratio of the circulation of the vortices ...
متن کاملPosterior Polar Hemispheric Choroidal Dystrophy
A 71-year-old Japanese woman presented with gradual deterioration of the visual fields in both eyes for the past five years. She did not have a history of previous ocular or systemic illnesses. There was no family history of a similar disease. Best corrected visual acuity was 0.8 and 0.9 in her right and left eyes, respectively. The fundi showed bilateral symmetrical annular bands of depigmenta...
متن کاملPolar mesosphere winter echoes
The thermal and dynamical state of the atmosphere during polar mesosphere winter echoes F.-J. Lübken, B. Strelnikov, M. Rapp, W. Singer, R. Latteck, A. Brattli, U.-P. Hoppe, and M. Friedrich Leibniz Institute of Atmospheric Physics, Kühlungsborn, Germany Norwegian Defence Research Establishment (FFI), Kjeller, Norway Institute of Communications Networks and Satellite Communications, Graz Univer...
متن کاملRapid formation and evolution of an extreme haze episode in Northern China during winter 2015
We investigate the rapid formation and evolutionary mechanisms of an extremely severe and persistent haze episode that occurred in northern China during winter 2015 using comprehensive ground and vertical measurements, along with receptor and dispersion model analysis. Our results indicate that the life cycle of a severe winter haze episode typically consists of four stages: (1) rapid formation...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Annales Geophysicae
سال: 2007
ISSN: 1432-0576
DOI: 10.5194/angeo-25-1279-2007