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2015 ; 120
(24
): 12474-12485
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Possible mechanism of abrupt jump in winter surface air temperature in the late
1980s over the Northern Hemisphere
#MMPMID27818850
Kim YH
; Kim MK
; Lau WK
; Kim KM
; Cho CH
J Geophys Res Atmos
2015[Dec]; 120
(24
): 12474-12485
PMID27818850
show ga
Possible cause of an abrupt warming in winter mean surface air temperature in the
midlatitudes of the Northern Hemisphere in the late 1980s is investigated using
observation and reanalysis data. To determine the timing of abrupt warming, we
use a regime shift index based on detection of the largest significant
differences between the mean values of two contiguous periods. Results show that
the abrupt warming occurred in association with a regime shift after the 1980's
in which the zonal mean sea level pressure (SLP) is significantly increased
(decreased) at the latitude 25-35°N (60-70°N), in the form of north-south
dipole-like SLP anomaly spanning the subtropics and high latitude. The dipole SLP
anomaly can be attributed to a northward expansion of Hadley cell, a poleward
broadening and intensification of the Ferrel cell, coupled with a collapse of
polar cell. During the abrupt warming, strong anomalous southerly warm advection
at the surface was induced by an enhanced and expanded Ferrel circulation, in
association with a northward and downward shift of maximum center of northward
eddy heat flux over the midlatitudes. An intensification of polar jet subsequent
to regime shift may be instrumental in sustaining the warming up to more than
5?years.