高级检索
周定文, 范广洲, 华维, 等. 我国春季降水与青藏高原东南部冬季归一化植被指数变化的关系[J]. 大气科学, 2009, 33(3): 649-656. DOI: 10.3878/j.issn.1006-9895.2009.03.20
引用本文: 周定文, 范广洲, 华维, 等. 我国春季降水与青藏高原东南部冬季归一化植被指数变化的关系[J]. 大气科学, 2009, 33(3): 649-656. DOI: 10.3878/j.issn.1006-9895.2009.03.20
ZHOU Dingwen, FAN Guangzhou, HUA Wei, et al. Relationship between Spring Rainfall in China and Winter Normalized Difference Vegetation Index in the Southeast of Tibetan Plateau[J]. Chinese Journal of Atmospheric Sciences, 2009, 33(3): 649-656. DOI: 10.3878/j.issn.1006-9895.2009.03.20
Citation: ZHOU Dingwen, FAN Guangzhou, HUA Wei, et al. Relationship between Spring Rainfall in China and Winter Normalized Difference Vegetation Index in the Southeast of Tibetan Plateau[J]. Chinese Journal of Atmospheric Sciences, 2009, 33(3): 649-656. DOI: 10.3878/j.issn.1006-9895.2009.03.20

我国春季降水与青藏高原东南部冬季归一化植被指数变化的关系

Relationship between Spring Rainfall in China and Winter Normalized Difference Vegetation Index in the Southeast of Tibetan Plateau

  • 摘要: 利用1982年1月~2001年12月归一化植被指数(NDVI)资料、台站实测降水资料和NCEP/NCAR再分析资料, 通过相关分析和合成分析等方法, 初步分析了我国春季降水与青藏高原冬季植被变化的关系。结果发现, 我国春季降水与青藏高原冬季NDVI有较明显的相关关系。一般而言, 高原冬季NDVI大值年时, 贵州至两广地区降水减少, 两湖平原和鄱阳湖平原降水增加, 长江流域以北至东北的广大地区降水将减少, 特别是黄河与长江之间地区降水量偏少可达40 mm以上。高原冬季NDVI与我国东部季风区春季降水的相关系数呈 “-+-” 的分布状态。100°E~130°E各月降水及其差值时空剖面分析也可看到其差异。文章也初步分析了高原冬季NDVI大值年和小值年春季海平面气压场、 850 hPa风场、 500 hPa高度场以及700 hPa垂直运动场的差异, 从分析结果可以看到, 亚洲和西太平洋地区大气环流的差异也同样明显。可见, 青藏高原冬季NDVI的大小将通过改变亚洲和西太平洋地区春季大气环流的分布状态, 导致冬季风和夏季风爆发和进退差异, 从而引起我国春季降水的变化。

     

    Abstract: On the basis of the monthly precipitation data during 1982-2001 collected from 624 observational stations in China, normalized difference vegetation index (GIMMS NDVI) and the NCEP/NCAR reanalysis data, the authors analyzed the relationship between the preceding winter vegetation variation over the Tibetan Plateau (TP) and spring precipitation in China. As a result, there are obvious connections between the spring precipitation fluctuation in China and the preceding winter vegetation variation over the TP. When the preceding winter NDVI is high, the precipitation in Guizhou, Guangdong, Guangxi provinces and from the north areas of the Yangtze River valley to Northeast China tends to be less, especially the precipitation over the areas from the Yellow River to the Yangtze River reduced more than 40 mm. The precipitation in the Jianghan and Dongting Lake plains and the Poyang Lake plain tends to be more. The correlation coefficient between the preceding winter NDVI over the TP and spring precipitation over the east monsoon areas of China presents the “-+-” distribution. The analysis of the time-space cross sections of precipitation averaged over 100°E-130°E for high and low preceding winter NDVI years and their difference shows the similar features. The authors also analyzed the differences of spring sea level pressure field, 850-hPa wind field, 500-hPa geopotential height field and 700-hPa vertical velocity field between high and low preceding winter NDVI years. The results show that the winter NDVI over the TP can change the Asian and western Pacific atmospheric circulation distributions, then affects the onset and advance/retreat of winter and summer monsoon, and finally lead to the spring precipitation change in China.

     

/

返回文章
返回