Temporal and Spatial Evolution Features of Precipitable Water in China during a Recent 65-Year Period (1951-2015)
Temporal and Spatial Evolution Features of Precipitable Water in China during a Recent 65-Year Period (1951-2015)
复制标题
近65年（1951—2015年）中国可降水量时空演变特征
DOI：
10.1155/2017/9156737
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发表时间：
2017
影响因子：
2.9
通讯作者：
He Jianxin
中科院分区：
文献类型：
--
作者：
Wang Hao;He Jianxin
大气中的水汽不仅是一种重要的温室气体，而且是影响全球气候和水循环变化的重要因素。利用NCEP和CMAP再分析资料，分析了近65年（1951-2015年）中国大气可降水量的时空分布特征，并研究了其与实际降水量的关系。中国土壤水的时空分布特征总体上呈现出由东南向西北方向减少的空间趋势。第一特征向量的空间分布格局表明，中国的PW具有全国性的变化特征，不同地区的PW数量不同。1967年是PW时空分布特征的重要转折期。我们还发现，PW具有约30年的固有变异性。在与降水量的关系上，东北地区和西北偏北地区的降水量与降水量的关系最为密切。不同地区表现出不同的效率转换PW降水。这些结论对了解水汽的长期演变及其对中国降水的潜在影响有一定的参考价值。
Water vapor in the atmosphere is not only an important greenhouse gas, but also an important factor that significantly affects the variations of global climate and water circulation. This study utilized the National Centers for Environmental Prediction (NCEP) and Climate Prediction Center Merged Analysis of Precipitation (CMAP) reanalysis data to probe the temporal and spatial distribution features of atmospheric precipitable water (PW) in China during a recent 65-year period (1951–2015), and the relationship between PW and actual precipitation was also studied. The temporal and spatial distribution characteristics of PW in China presented an overall decreasing spatial trend from the southeast to northwest direction. The spatial distribution pattern of the first eigenvector demonstrated that the PW in China shows nationwide variation features with a varying amount of PW across different regions. The year 1967 was further identified as an important transition period for the temporal and spatial distribution characteristics of the PW. We also found that the PW had inherent variability of around 30 years. Regarding the relationship with precipitation, PW was most closely correlated with precipitation in the northeastern region and the upper northwestern region in China. Different regions displayed different efficiencies for converting PW to precipitation. The conclusions are useful for understanding the long-term water vapor evolution and its potential effects on precipitation in China.