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The Dynamic Plateau Monsoon Index and Its Association with General Circulation Anomalies

Advances in Atmospheric Sciences 2012年第6期29卷 1249-1263页

作者：荀学义胡泽勇马耀明 Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences Inner Mongolia Autonomous Region Meteorological Observatory Institute of Tibetan Plateau Research Chinese Academy of Sciences

Based on monthly ECMWF reanalysis-Interim （ERA-Interim） reanalysis data, along with monthly precipitation and temperature data, the Dynamic Plateau Monsoon Index （DPMI） is defined. The results of a contrast analysis of the DPMI versus the Traditional Plateau Monsoon Index （TPMI） are described. The response of general circulation to northern Qinghai-Xizang Plateau summer monsoon anomalies and the correlation of the DPMI with general circulation anomalies are investigated. The results show that, the DPMI reflected meteorological elements better and depicted climate variation more accurately than the TPMI. In years when the plateau summer monsoon is strong, the low over the plateau and the trough near the eastern coast of Asia are deeper and higher than normal over South China. This correlation corresponds to two anomalous cyclones over the plateau and the eastern coast of Asia and an anomalous anticyclone in South China. The plateau and its adjacent regions are affected by anomalous southwesterly winds that transport more moisture to South China and cause more precipitation. The lower reaches of the Yangtze River appear to receive more precipitation by means of the strong westerly water vapor flow transported from the ＂large triangle affecting the region＂. In years when the plateau summer monsoon is weak, these are opposite. The plateau monsoon is closely related to the intensity and position of the South Asian high, and the existence of a teleconnection pattern in the mid-upper levels suggests a possible linkage of the East Asian monsoon and the Indian monsoon to the plateau summer monsoon.

关键词： Qinghai-Xizang Plateau Dynamic Plateau Monsoon Index center position general circulation

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Research on Pupil center Location Based on Improved Hough Transform and Edge Gradient Algorithm

Research on Pupil Center Location Based on Improved Hough Tr...

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2012 National Conference on Information Technology and Computer Science

作者： Dewu Chen School of Information Science & Engineering Lanzhou University Lanzhou,China Junnan Bai School of Information Science & Engineering Lanzhou University Lanzhou,China Zhiyi Qu School of Information Science & Engineering Lanzhou University Lanzhou,China

According to the poor efficiency of the traditional Hough transform algorithm to detect the pupil center,this paper proposed an edge gradient algorithm,which combines with improved Hough transform algorithm to detect the pupil *** the beginning,a modified Hough transform algorithm was used to detect the pupil center,if more than one circle was found,the edge gradient algorithm was used to remove the excess *** results show that our proposed method can not only improve the efficiency of pupil center location but also achieve better accuracy.

关键词： pupil detection center position Hough transform the edge gradient

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Dynamic Plateau Monsoon Index and its Association with General Circulation Anomaly

Dynamic Plateau Monsoon Index and its Association with Gener...

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强化科技基础推进气象现代化——第29届中国气象学会年会

Based on monthly ECMWF re-analysis-Interim(ERA-Interim) reanalysis data and monthly precipitation and temperature data,a Dynamic Plateau Monsoon Index(DPMI) was defined;it is a revision of the Traditional Plateau Monsoon Index(TPMI).A contrast analysis of the DPMI versus the TPMI was then *** general circulation response to northern Qinghai-Xizang plateau summer monsoon anomalies and the correlation of the DPMI with general circulation anomalies were *** results of this study show that during the plateau summer monsoon,the main body of the plateau is controlled by a powerful warm low;the wind field makes a cyclonic meander near the surface;and the air flow over the plateau converges toward the changeable warm low center over *** DPMI reflected meteorological elements better and depicted climate variation more accurately than did the *** years when the plateau summer monsoon is strong,the low over the plateau and the trough near the eastern coast of Asia are deeper and higher than normal over South *** correlation corresponds to two anomalous cyclones over the plateau and the eastern coast of Asia and an anomalous anticyclone in South *** plateau and its adjacent regions are affected by anomalous southwesterly winds that transport more moisture to South China and cause more *** lower reaches of the Yangtze River appear to receive more precipitation by means of the strong westerly water vapor flow transported from the "large triangle affecting the region," which corresponds to the strong plateau summer *** years when the plateau summer monsoon is weak,the low over the plateau and the trough near the eastern coast of Asia are shallower,and the high over South China is weaker than normal,which corresponds to two anomalous anticyclones over the plateau and the eastern coast of Asia and an anomalous cyclone in South *** plateau and its adjacent regions are affected by anomalous northwesterly winds tha

关键词： Qinghai-Xizang Plateau Dynamic Plateau Monsoon Index low pressure systems center position general circulation

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