Overview of East Asian Summer Monsoon etc

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Presentation transcript:

Overview of East Asian Summer Monsoon etc Department of Meteorology The Grantham Institute for Climate Change Overview of East Asian Summer Monsoon etc Brian Hoskins

Mean sea level pressure (ERA40 data) Dec-Feb L L H H June-Aug H H L

Average Surface Temperature Dec - Feb June-Aug

Winds at 925hPa Dec-Feb June-Aug

Winds at 200 hPa Dec-Feb June-Aug

Rainfall (mm/day) Dec-Feb June-Aug

Column integrated Heating

Average Temperature 200-500 hPa Dec-Feb June-Aug

Streamfunction & velocity potential at 200 hPa DJF

Summer monsoon & subtropical anticyclone cartoon W C C W C Equator

Climate of Chinese summer rainfall in the period 1958-2007 Yonghui Lei

Summer: Moisture transport by the atmosphere May H July

Moisture transport 1958-2002 June July August

Seasonal Progression of the Meiyu-Changma-Baiu Front 335K Ɵe at 850 hPa Yonghui Lei

Latitude-time section at 105-122E Chinese summer rainfall

Baiu lat-time 130-140E composited with respect to its end-day Shin-ichi Suzuki Θe at 850 Precip rate

Composites of 325K Ɵe at 850 hPa wrt Baiu end

20-60N 250 Streamfunction departures composited wrt Baiu end

Dominant patterns of winds and OLR associated with summer intraseasonal oscillations 850hPa – Active phase over India Dominant EOF pattern of OLR associated with peak active/break spell over India 200hPa – Active phase over India Annamalai, Slingo and Sperber

Direct response to Tibetan Plateau Liu et al, 2007 Idealised shape Realistic shape D D U U

Response to Tibetan Plateau, including heating above it Liu et al, 2007 D U D U Fig. 5

Extreme states of Intra-seasonal Oscillation in model Fig. 9

Fig. 7

Trend in measured summer rainfall 1958-2007 Yonghui Lei Yonghui Lei mm

Two summer rainfall patterns Yonghui Lei

Two summer rainfall patterns 1901-2002 (CRU data)

Rainfall Intensity & Frequency 1958-2007 Yonghui Lei

Regression of surface temperature on PCs of Chinese summer rainfall previous spring & summer

EOF1 of summer rainfall & Tibetan Plateau temperatures Wang et al 2008

Overview of East Asian Summer Monsoon etc Department of Meteorology The Grantham Institute for Climate Change Overview of East Asian Summer Monsoon etc Brian Hoskins

DJF Heating below 700 hPa

Total Precipitation

Fig. 6

Fig. 12

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