Using fast ocean atmosphere model 1.5 (FOAM1.5), the numerical model stimulation of the tropical Indian Ocean Basin mode impacts on precipitation in east of northwest China in May are run and tested. The modeling precipitation and atmospheric circulation anomaly fields are basically similar to observational results, only with the anomaly system in East Asia a little eastward shifting. It is found that the tropical Indian Ocean SSTA warm Basin mode, being a heating source near the equator, can induce atmospheric circulation anomaly responses of the like "Matsuno-Gill Pattern". The atmospheric circulation anomaly appears to be an anomaly high center over southwest of Qinghai-Tibetan Plateau, and this anomaly further spreads downstream to forming a remote correlation wave train along the jet axis in the mid-high latitude of north hemisphere. With the altitude increasing, the atmospheric anomaly responses are more significant. The east of northwest China is just located under the anomaly circulation pattern of "east high and west low" of anomaly wave train over East Asia, with wind being strong anticyclone and divergence at high level and weak cyclone and convergence at low level. And accompanying with upward motion, it is advantage for more precipitation. Therefore, FOAM1.5 model experiment verified observational results of the tropical Indian Ocean SSTA impacts on precipitation of east of Northwest China basically.
YANG Jianling
,
HU Haibo
,
MU Jianhua
,
WANG Min
,
HU Wendong
. Study of Numerical Model Stimulation of the Tropical Indian Ocean Basin Mode Impacts on May Precipitation Anomaly in East of Northwest China[J]. Plateau Meteorology, 2017
, 36(2)
: 510
-516
.
DOI: 10.7522/j.issn.1000-0534.2016.00036
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