青藏高原春季土壤湿度与中国东部夏季降水之间的关系

The relation between soil moisture over the Tibetan Plateau in spring and summer precipitation in the eastern China

应用SVD方法分析了青藏高原地区春季土壤湿度异常和中国东部地区夏季降水之间的关系.结果表明,青藏高原不同地区、不同深度的土壤湿度与中国东部夏季降水的相关特征不同.青藏高原东北部和西北部0～10 cm深度（表层）土壤湿度与中国华北、东北地区的夏季降水为正相关,而与华南地区为负相关;青藏高原中部及南部0～10 cm表层土壤湿度与华北地区夏季的降水有较强负相关;青藏高原北部及东部10～200 cm深度（深层）土壤湿度与华北、东北地区的夏季降水为负相关,而与华南地区夏季降水为正相关;青藏高原中东部10～200 cm深层土壤湿度与长江中下游和华南大部分地区夏季降水呈负相关关系.即青藏高原不同地区、不同深度层春季土壤湿度的变化,对中国东部地区的夏季降水具有显著影响.

The relation between soil moisture anomalies over the Tibetan Plateau and the summer precipitation in eastern China was analyzed using SVD method.The results show that the correlation between soil moisture over the plateau and summer precipitation in eastern China is various,which depends on location and depth.The surface soil moisture in the northeast and northwest of the Tibetan Plateau is positively related to the summer precipitation in North China and Northeast China,while it is negatively related to that in the South China.There is a strong negative correlation between the surface soil moisture in the central and southern part of the plateau and the summer precipitation in North China.The deep soil moisture in the northern and eastern Tibetan Plateau is negatively correlated with the summer precipitation in North China and Northeast China,while it is positively correlated with the soil moisture in South China.The deep soil moisture in the eastern and central Tibetan Plateau has a negative correlation with summer precipitation in the middle and lower reaches of the Yangtze River and most parts of South China.The changes of soil moisture in different regions and different depths over the plateau have a significant effect on the summer precipitation in eastern China.