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Different Sources of 10‐ to 30‐day Intraseasonal Variations of Autumn Snow over Western and Eastern Tibetan Plateau
Author(s) -
Song Lei,
Wu Renguang,
An Lu
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl083852
Subject(s) - climatology , plateau (mathematics) , snow , rossby wave , middle latitudes , snow line , subtropical ridge , subtropics , environmental science , snow cover , geology , bay , arctic oscillation , atmospheric sciences , oceanography , geography , meteorology , northern hemisphere , precipitation , mathematical analysis , mathematics , geomorphology , fishery , biology
Abstract Using the latest daily Moderate Resolution Imaging Spectroradiometer satellite snow cover data, the present study reveals distinctly different sources of 10‐ to 30‐day intraseasonal snow cover variations over the western and eastern Tibetan Plateau (TP) during September–December. The intraseasonal snow variation over the western TP is related to a midlatitude wave train associated with the Arctic Oscillation and that over the eastern TP is related to a subtropical wave train triggered by the North Atlantic Oscillation. The Rossby wave train in both cases leads to anomalous water vapor convergence and ascending motion, which contributes to snow accumulation and positive snow cover anomalies. For the western TP snow events, the moisture comes from the Caspian Sea. During the eastern TP snow events, the moisture originates from the Bay of Bengal.