首页|夏季亚洲大气热源汇的变化特征及其与江淮流域旱涝的关系

夏季亚洲大气热源汇的变化特征及其与江淮流域旱涝的关系

Characteristics of the Atmospheric Heating Source/Sink over Asia and Its Relationship with Drought/Flood in the Yangtze River-Huaihe River Valley

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 维普
  • 万方数据
用2001年和2003年NCEP/NCAR再分析资料, 计算了亚洲季风区两年逐日的大气热源汇〈Q1〉, 再用谐波分析方法对〈Q1〉作带通滤波, 得到了准30～70 d的〈Q1〉低频分量, 并分析了两年夏季大气热源汇和其低频振荡变化特征的差异, 然后研究了一些 "关键" 区〈Q1〉低频分量的变化与我国降水的关系.结果表明: 在2001年和2003年夏季的亚洲季风区, 一方面应该有这样一种过程, 大气热源汇低频分量经向和纬向传播的差异→江淮流域旱涝期东亚地区大气热源汇低频分量南北配置的差异→东亚地区大气热源汇本身的南北分布不同.另一方面, 夏季的5～8月期间, 高原中南侧有较强的低频热源 (热汇) 时, 可导致其后期江淮流域降水偏多 (少); 中国南海的作用则正好相反, 南海有较强的低频热源 (热汇) 时, 不仅可导致其后期江淮流域降水偏少 (多), 还可导致其后期青藏高原东部降水偏少 (多).因此, 夏季亚洲季风区热源、热汇季节内变化特征的不同可导致我国江淮流域异常的旱涝发生.
Drought and flood are the main disasters of Eastern China. During the summers of 2001 and 2003 , the severe drought and flood occurred respectively in the Yangtze River - Huaihe River basin. In order to investigate the causes, the daily atmospheric heating source/sink < Q1 > over Asian monsoon area is computed by using the thermodynamic equation and the NCEP/NCAR re-analyses data of 2001 and 2003, and then its quasi-30 -70-day low-frequency oscillation ( LFO ) is got by the Fourier transform according to the significance periodic variation of the < Q1> which is got using the spectral analysis in three key areas. Then the differences of the < Q1> and its LFO in the two summers are analyzed, furthermore the relationship between the < Q1> LFO in some key areas and the delayed rainfall in China is investigated in the summer of 2003. The result shows that: On the one hand, the process should is that the meridional and zonal propagation of the < Q1> LFO is different → the North-South scheme of the < Q1> LFO over East Asia is different during the drought/flood periods of the Yangtze River - Huaihe River basin → the North-South distribution of the < Q1 > is also different in the summers of 2001 and 2003. On the other hand, there are the significance correlations between the changes of the < Q1 > LFO over the middle-southern Tibetan Plateau and the South China Sea from May 1 to August 6 and the delay rainfall of the Yangtze River - Huaihe River basin from May 11 to August 16. While the stronger heating source/sink of the < Q1 > LFO is over the middle southern Tibetan Plateau, the heavier/lighter rainfall maybe appears in the Yangtze River - Huaihe River basin, but it is reverse over the South China Sea. At one time, the heating source/sink of the < Q1 > LFO over the South China Sea is also significantly negatively correlated with the rainfall in the eastern Tibetan Plateau in summer. Therefore, the difference of the characteristics of < Q1 > LFO over Asian monsoon area can lead to the abnormal summer drought/flood in the Yangtze River -Huaihe River valley of China.

low-frequency oscillation (LFO)the Tibetan Plateauatmospheric heating source/sinkdrought/flood of the Yangtze River - Huaihe River basin

巩远发、段廷扬、张菡

展开 >

成都信息工程学院,成都,610041

中国科学院东亚区域气候-环境重点实验室,北京,100029

低频振荡 青藏高原 大气热源(热汇)江淮流域旱涝

国家重点基础研究发展计划(973计划)国家自然科学基金国家自然科学基金中国科学院重点实验室基金

2004CB4183024027502940675036

2007

大气科学
中国科学院大气物理研究所

大气科学

CSTPCDCSCD北大核心
影响因子：2.11
ISSN：1006-9895
年,卷(期)：2007.31(1)
  • 37
  • 7