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2016 ; 6
(ä): 21346
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Summer precipitation anomalies in Asia and North America induced by Eurasian
non-monsoon land heating versus ENSO
#MMPMID26916258
Zhao P
; Wang B
; Liu J
; Zhou X
; Chen J
; Nan S
; Liu G
; Xiao D
Sci Rep
2016[Feb]; 6
(ä): 21346
PMID26916258
show ga
When floods ravage Asian monsoon regions in summer, megadroughts often attack
extratropical North America, which feature an intercontinental contrasting
precipitation anomaly between Asia and North America. However, the
characteristics of the contrasting Asian-North American (CANA) precipitation
anomalies and associated mechanisms have not been investigated specifically. In
this article, we firmly establish this summer CANA pattern, providing evidence
for a significant effect of the land surface thermal forcing over Eurasian
non-monsoon regions on the CANA precipitation anomalies by observations and
numerical experiments. We show that the origin of the CANA precipitation
anomalies and associated anomalous anticyclones over the subtropical North
Pacific and Atlantic has a deeper root in Eurasian non-monsoon land surface
heating than in North American land surface heating. The ocean forcing from the
ENSO is secondary and tends to be confined in the tropics. Our results have
strong implications to interpretation of the feedback of global warming on
hydrological cycle over Asia and North America. Under the projected global
warming due to the anthropogenic forcing, the prominent surface warming over
Eurasian non-monsoon regions is a robust feature which, through the mechanism
discussed here, would favor a precipitation increase over Asian monsoon regions
and a precipitation decrease over extratropical North America.