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亚澳季风环流年际变异特征 的研究 PowerPoint Presentation
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亚澳季风环流年际变异特征 的研究. 赵京华 黄菲 (教授) 中国海洋大学 气象系 e-mail: zhaojinghua@ouc.edu.cn. 主要内容. 资料与方法介绍 季风环流指数定义 ( IAAM=Index of Asia-Australia Monsoon ) 结果分析 结论. 资料与方法介绍. NCAR/NCEP 资料 NCAR/NCEP 月平均风场资料( 1948 ~ 2004 年, 30°E ~ 180°E , 40°S ~ 40°N), 水平分辨率 2.5°*2.5° 。

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亚澳季风环流年际变异特征

的研究

赵京华 黄菲(教授)

中国海洋大学 气象系

e-mail: zhaojinghua@ouc.edu.cn

slide2

主要内容

  • 资料与方法介绍
  • 季风环流指数定义

(IAAM=Index of Asia-Australia Monsoon)

  • 结果分析
  • 结论
slide3

资料与方法介绍

    • NCAR/NCEP资料
  • NCAR/NCEP月平均风场资料(1948~2004年,30°E~180°E,40°S~40°N),水平分辨率2.5°*2.5°。
  •   垂直方向上取对流层下层1000hPa,925hPa,850hPa,700hPa四层经向风V平均作为低层,和对流层上层300hPa,250hPa,200hPa,150hPa,100hPa五层经向风V平均作为高层。

方法介绍

本文所采用的方法主要有三种,它们为:连续功率谱分析,谐波分析和合成场分析。

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季风环流指数定义

10S-10N,90-150E

Pic.1 The time series curve for the IAAM, the red line stands for the standardized time series on the low level of the troposphere, the blue line stands for the standardized time series on the high level of the troposphere, the black line is the time series of the IAAM.

slide5

结果分析

季节变化

Pic.2 The time series curve for the seasonal variation of the IAAM

slide6

距平序列

Pic.3 The time series curve for the anomaly of the IAAM

slide7

功率谱分析

19a

3a

2a

Pic.4 The curve for the continuous spectrum and the check line of the red noise.

slide8

谐波分析

准5年

准3年

准2年

Fig. 5 The time series curve for the standardizedinterannual component(1 and a half years to 8 years) of the IAAM

slide9

功率谱检验

38 m

65.1 m

24 m

Fig.6 The curve for the continuous spectrum and

the check line of the interannual variation

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年际分量合成场分析

阴影部分过95%信度检验

高层合成风场差值图

A

c

C

A

A

A

Fig. 7 The composed wind field on the low

level of the troposphere for abnormal

index of balance of the interannual component of IAAM

C

Fig. 8 The composed wind field on the

high level of the troposphere for abnormal

index of balance of the interannual component of IAAM

低层合成风场差值图

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结论

IAAM分析结果表明:亚澳季风环流(AAM)有显著的年周期的波动,这与季风实际变化情况相符合;通过对IAAM功率谱分析和谐波分析表明:AAM2~3年和3~5年的年际变化也较显著。

通过对AAM低高层水平合成场分析可知:影响AAM的系统在低空有澳大利亚的冷性反气旋、沿100E以东的越赤道气流、西太平洋副高和赤道东风气流等各个系统,在高空有南亚高压、南半球强大的反气旋和高空自北半球向南半球的越赤道气流等。当这些系统发生异常时,AAM会随之发生改变。

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End

Thanks