1. The Interdecadal change of winter climate over China
XiaoJing Jia
ZheJiang University, HangZhou,China

3. Content
Background
The interdecadal change of the winter precipitation over China
我的报告主要分为4个部分：研究背景，我使用的数据和主要方法，我们目前所取得的研究成果，以及总结展望。
Interdecadal change in the contribution of ENSO and EAWM to the precipitation
Summary

5. AC C El Niño-Southern Oscillation
--- Western Pacific Anti-Cyclone (WPAC) AC C
SST
Cooling
SST
Warming

6. EAWM circulation system:SH AL

7. (McBride et al., 2003; Hamada et al., 2002; Lau and Nath, 2003)
The El Niño-Southern Oscillation (ENSO) is regarded as the most important factor that influences the East Asian winter Monsoon.
El Niño —— warm and wet
La Niña —— cold and dry
(McBride et al., 2003; Hamada et al., 2002; Lau and Nath, 2003)
(From Ashok and Yamagata 2009)

8. Content
Background
The interdecadal change of the winter precipitation over China
Interdecadal change in the contribution of ENSO and EAWM to the precipitation
Summary

9. P2 P1

10. Z500
SLP P1 P2

11. DJF
The SST anomalies associated with EOF1 for P1 (left) and P2 (right).

12. P2 P1
DJF
The SST anomalies associated with EOF1 for P1 (left) and P2 (right).

13. Content
Background
The interdecadal change of the winter precipitation over China
Interdecadal change in the contribution of ENSO and EAWM to the precipitation
Summary

14. P1 P2 The interdecdal change of ENSO_independent EAWM SLP
Moisture transport

15. The interdecdal change of EAWM_independent ENSO
SST
Prec

16. ENSO- covergence wind+VP (850hPa)

17. The interdecdal change of EAWM_independent ENSO

18. ENSO – related anomalies: mid- high latitudes SLP+Z500

19. ENSO- covergence wind+SAT (850hPa)AC P1 P2 AC

20. P1
P2-P1 P2

21. Simple General Circulation Model (SGCM)
*Ｄry,Ｓpectral,Ｐrimitive equation model
-- --Hall 2000
*T31,10 equally spaced sigma levels, Global domain
* Emperical forcings calculated from observed data
--- model forcings, use the NCEP/NCAR reanalyses
--- forcing includes all processes that cannot be expressed explicitly by the model
dynamics, such as the influence of SST, sea ice, diabatic heating and
boundary processes such as the orographic forcing.
--- a large number of experiments can be performed.

22. Numerical Experiment (SGCM)+ -
Central peak vertically averaged value: 2OC/day (1cm/day)
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23. P1 P2

24. Content
Background
The interdecadal change of the winter precipitation over China
Interdecadal change in the contribution of ENSO and EAWM to the precipitation
Summary

25. P1 P2 tropics system EAWM ENSO mid- to high-latitude system 1960-1987
anticyclone over mid-to high-latitude North Pacific
mid-1980s
influence
EAWM
ENSO
influence P2
tropics system
EAWM
ENSO
anticyclone over the Philippine

26. P1
El Niño P2

27. THANK YOU !