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October circulation precursors of the wintertime Arctic Oscillation
Author(s) -
Kryjov Vladimir N.
Publication year - 2015
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.3968
Subject(s) - anticyclone , arctic oscillation , climatology , anomaly (physics) , geopotential height , geology , geopotential , peninsula , siberian high , arctic , troposphere , atmospheric sciences , east asia , environmental science , oceanography , precipitation , geography , meteorology , physics , archaeology , northern hemisphere , china , condensed matter physics
Investigation into atmospheric processes preceding winters of different Arctic Oscillation index ( AOI ) polarity, based on empirical data analysis, has revealed highly statistically significant relationships between the wintertime AOI and preceding October circulation. The wintertime AOI strongly covaries with an October circulation anomaly barotropically spanning the depth of the troposphere over the Taymyr Peninsula (Taymyr circulation anomaly, TCA ), with the anticyclonic (cyclonic) TCA preceding winters of the negative (positive) AOI polarity. The October TCA affects the wintertime AOI polarity mainly via its impact on air temperature over the Arctic and North‐East Asia. Anticyclonic (cyclonic) TCA leads to the positive (negative) temperature anomaly over the Arctic and a corresponding increase (decrease) of geopotential heights, and to the negative (positive) temperature anomaly over North‐East Asia and so to enhancement (weakening) of the climatological trough associated with long planetary waves and corresponding enhancement (weakening) of the upward wave activity flux. To characterize temporal variability of the TCA , a Taymyr circulation index ( TCI ) is suggested. Correlation coefficient between the (inverted) wintertime AOI and the October TCI is 0.58 for the 1958–2012 period, with correlations being stable in time. The anticyclonic (cyclonic) TCA is associated with smaller (larger) number of cyclones coming to the region of the eastern Barents Sea–Taymyr Peninsula–Laptev Sea. Statistical relationships between the October TCA , wintertime AOI and September/October sea surface temperature in the northern Barents Sea are shown.