tailieunhanh - Climate Change and Variability Part 3

Tham khảo tài liệu 'climate change and variability part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 48 Climate Change and Variability satellite-based monthly precipitation product and a merged short-record 1998-2006 1 x1 TRMM 3B43 monthly rainfall product not shown . The basin-mean rainfall is computed over a domain of 15o-35oW. Finally Pitcz Latrrcz and Pdm are determined by subtracting their corresponding mean seasonal cycles. Time series for these three indices are depicted in Fig. 2. Rainfall changes during these two seasons are comparable calibrated by either Pitcz or pdm. However the ITCZ does not change much its mean latitudes during JJA in contrast to evident fluctuations during MAM. Thus the major rainfall changes during JJA are related to the variability of the ITCZ strength and or the basin-mean rainfall. This probably implies a lack of forcing mechanism on the ITCZ location during JJA. Past studies suggested that the Atlantic interhemispheric SST mode though a dominant factor of the ITCZ position during MAM becomes secondary during JJA . Sutton et al. 2000 Gu Adler 2006 . o Pon b Prrcz c Lotncr 1980 1985 1990 1995 2000 2005 Yeor Fig. 2. Time series of a the domain-mean rainfall pdm b the ITCZ strength Pitcz and c the ITCZ latitudes LatITCZ during JJA solid and MAM dash-dot . Simultaneous correlations between SST anomalies with Pitcz and LatITCZ are estimated during both seasons Fig. 3 . During JJA the major high-correlation area of SST anomalies with Pitcz is located west of about 120oW in the tropical central-eastern Pacific and the correlations between SST anomalies and LatITCZ are generally weak in the tropical Pacific. Within the tropical Atlantic significant positive correlations with Pitcz roughly cover the Summer-Time Rainfall Variability in the Tropical Atlantic 49 entire basin from 20oS to 20oN. It is of interest to note that the same sign correlation is found both north and south of the equator suggesting a coherent local forcing of rainfall variability during JJA. Furthermore evident negative correlations between SST

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