期刊名称：Tellus A: Dynamic Meteorology and Oceanography
电子版ISSN：1600-0870
出版年度：1998
卷号：50
期号：3
页码：302-312
DOI：10.3402/tellusa.v50i3.14528
摘要：Several recent works attribute the formation of polar stratospheric clouds (PSCs) to the occurrenceof localized orographic waves. Using ECMWF analyses, we investigate the large scalestratospheric flow conditions in a number of cases where PSCs have been detected, both in theArctic and in the Antarctic. We show that PSCs appear within strong planetary scale uplifts ofisentropic surfaces. The adiabatic cooling of air parcels travelling within such planetary scaleuplifts while conserving their humidity and trace constituents, seems to be the main mechanismfor PSC formation. The PSC distribution would then follow a planetary structure, even thoughlocal orographic waves could still play an additional role when planetary scale conditionsare met.
