Annual Report 2012 - City University of Hong Kong

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Figure 10. Same as Figure 9, but for Southeast China. Reference: Li, X. Z, W. Zhou, C.Y. Li, and J. Song, 2013: Comparison of the moisture supply over Southwest and Southeast China. J. Climate (under review) B2. Climatology and characteristics of Northern hemisphere blocking events (PI: Wen ZHOU) B2.1 Characteristics of atmospheric blocking over Ural-Siberia The climatology of the characteristics of blocking events, including duration, intensity, and extension, in four seasons over the Northern Hemisphere was analyzed for the period 1950–2009. The seasonality and spatial variations of these characteristics were studied according to their longitudinal distributions. The blocking not only occurred more frequently but also underwent stronger amplification in winter; likewise, the blocking occurred less frequently and underwent weaker This study shows that there are sharp discrepancies in the blocking characteristics between winter and summer, and these differences are more prominent over the Atlantic and Pacific Oceans. 13
14 amplification in summer. There are very strong interrelationships among different blocking characteristics, suggesting that they are supported by similar physical factors. In addition, the relationship between blocking over different regions and East Asian circulation was examined. Ural–Siberia is a major blocking formation region in all seasons that may exert a downstream impact on East Asia. The impact is generally weak in summer, which is due to its lower intensity and smaller duration. However, the extratropical circulation over East Asia in summer can be disturbed persistently by the frequent occurrence of blocking over the Asian continent or the Western Pacific. In particular, the blocking frequency over the Western Pacific underwent a significantly increased during the study period. This climatological information provides a background for studying the impact of blocking on East Asian circulation under both present and future climate conditions (See Figure 11). For more details, please refer to Cheung et al. (2013). Figure 11. 60-yr climatology of Northern Hemisphere blocking frequency in four seasons as a function of longitude: (a) spring (MAM), (b) summer (JJA), (c) autumn (SON) and (d) winter (DJF), where the solid line indicates the median, blue error bars denote the 25-th and 75-th percentile and red error bars denote the 75-th and 95-th percentile. Unit: days. Reference: Cheung, H.N., W. Zhou, Y. P. Shao, W. Chen , H. Y. Mok and M. C. Wu, 2013: Observational climatology and characteristics of wintertime atmospheric blocking over Ural-Siberia. Clim. Dyn. DOI 10.1007/s00382-012-1587-6. (In Press).
Page 1 and 2: Guy Carpenter Asia-Pacific Climate
Page 3 and 4: Contents 1 Executive Summary 5 I. I
Page 5 and 6: 6 (i.e. Exp2). (c) is the differenc
Page 7 and 8: 8 Reference: Liu, K. S. and J. C. L
Page 9 and 10: 10 A3.3 Effects of Pacific-Japan te
Page 11: 12 B1.2 Comparison of the moisture
Page 15 and 16: 16 Reference: Cheung, H. N., W. Zho
Page 17 and 18: 18 C2. Development of a multi-model
Page 19 and 20: 20 precipitation and evapotranspira
Page 21 and 22: 22 Reference: Huang WR, Chan JCL, A
Page 23 and 24: 24 D2. Black carbon source identifi
Page 25 and 26: 26 mixing state and size distributi
Page 27 and 28: 28 Figure 24. Comparison of the DAS
Page 29 and 30: 30 maximum precipitation as well as
Page 31 and 32: 32 D6. Climatic impacts from the ch
Page 33 and 34: 34 Publications Journal Papers Au-Y
Page 35 and 36: 36 Staff list Director Prof. Johnny

Annual Report 2012 - City University of Hong Kong

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