Numerical simulation of Eurasian teleconnection pattern in atmospheric circulation during the Northern Hemisphere winter |
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| Authors: | K Gambo Lu Li and Li Weijing |
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| Institution: | (1) Laboratary of Numerical Modelling for Atmospheric Sciences and Geophysical Fluid Dynamics, IAP, Academia Sinica, Beijing;(2) Lanzhou Institute of Plateau Atmospheric Physics, Academia Sinica, Beijing |
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| Abstract: | In this paper, the anomaly of disturbance height field over Northern Hemisphere due to SST anomaly in the tropical Atlantic
Ocean is simulated by using the general circulation model of IAP. A quasi-geostrophic, 34-level spherical coordinate model
is also used to compute the distribution of atmospheric circulation anomaly when there is an anomaly of heat source over the
tropical Atlantic. The computed results show that, owing to the heat source anomaly over the tropical Atlantic, the EU-pattern
anomaly in the winter circulation may be caused. Namely, a ridge will be enhanced over the northwest Europe, a trough will
be deepened over Siberia, but a positive anomaly of disturbance height field will be formed over the northeast China, Japan
and other areas of East Asia. Moreover, the numerically simulated results show that the above-mentioned EU-pattern anomalies
of circulation are due to the propagations of planetary wave train. About 15 days after an anomaly of the heat source over
the tropical Atlantic is injected, the EU-pattern anomaly of atmospheric circulation is formed. This is in good agreement
with the results analysed theoretically.
On the leave from Geophysical Institute, Faculty of Science in Tokyo University, Japan. |
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