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The influence of air temperature and atmospheric circulation on winter fog frequency over Northern Eurasia
Author(s) -
Ye Hengchun
Publication year - 2009
Publication title -
international journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0899-8418
DOI - 10.1002/joc.1741
Subject(s) - climatology , surface air temperature , arctic oscillation , atmospheric circulation , environmental science , air temperature , atmospheric sciences , north atlantic oscillation , warm front , atmospheric pressure , atmospheric instability , atmospheric temperature , precipitation , geography , meteorology , geology , northern hemisphere , wind speed
This study examines the relationship between the number of fog days with surface air temperature and with atmospheric circulation as represented by the Arctic Oscillation (AO) and Siberian High (SBH) Pressure index over northern Eurasia during the winters of 1936–1937 to 1989–1990. The results suggest that the number of fog days decreases as surface air temperature increases, the SBH weakens, and the AO strengthens over much of the study region, except for southern European Russia, where fog days may increase with air temperature. The most significant and dominant impact on fog day frequency is surface air temperature, followed by the intensity of the SBH which directly reflects atmospheric stability. The AO has some limited influence on fog frequency over northern European Russia and southwestern Siberia. The combination of air temperature with either SBH or AO index explained, on average, about 30–60% of the variability of winter fog days over Siberia. Copyright © 2008 Royal Meteorological Society