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| Relations between oxygen stable isotopic ratios in precipitation and relevant meteorological factors in southwest China | |
| 作者姓名： | ZHANG XinPing LIU JingMiao SUN WeiZheng HUANG YiMin & ZHANG JianMing College of Resources and Environment Hunan Normal University Changsha China Chinese Academy of Meteorological Sciences Beijing China Cold and Arid Regions Environmental and Engineering Research Institute Lanzhou China |
| 作者单位： | ZHANG XinPing1，LIU JingMiao2，SUN WeiZheng3，HUANG YiMin1 & ZHANG JianMing1 1 College of Resources and Environment，Hunan Normal University，Changsha 410081，China; 2 Chinese Academy of Meteorological Sciences，Beijing 100081，China; 3 Cold and Arid Regions Environmental and Engineering Research Institute，Lanzhou 730000，China |
| 基金项目： | 国家高技术研究发展计划(863计划) |
| 摘 要： | The correlations of isotopic ratios in precipitation with temperature, air pressure and humidity at dif- ferent altitudes, in southwest China, are analyzed. There appear marked negative correlations for the δ 18O in precipitation with precipitation amount, vapor pressure and atmospheric precipitable water (PW) at Mengzi, Simao and Tengchong stations on synoptic timescale; the marked negative correlations between the δ 18O in precipitation and the diurnal mean temperature at 400 hPa, 500 hPa, 700 hPa and 850 hPa are different from the temperature effect in middle-high-latitude inland. Moreover, the notable positive correlation between the δ 18O in precipitation and the dew-point deficit △Td at different altitudes is found at the three stations. On annual timescale, the annual precipitation amount weighted mean δ 18O display the negative correlations not only with annual precipitation but also with annual mean temperature at 500 hPa. It can be deduced that, in the years with abnormally strong summer monsoon, more warm and wet air from low-latitude oceans is transported northward along the vapor channel located in southwest China and generates abnormally strong rainfall on the way. Meanwhile, the ab- normally strong condensation process will release more condensed latent heat into atmosphere, and lead to the rise of atmospheric temperature during rainfall, but decline of the δ 18O in precipitation. On the contrary, in the years with abnormally weak summer monsoon, the abnormally weak condensation process will release less condensed latent heat into atmosphere, and lead to the decline of atmos- pheric temperature during rainfall, but increase of the δ 18O in precipitation. |
Relations between oxygen stable isotopic ratios in precipitation and relevant meteorological factors in southwest China |
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| ZHANG XinPing,LIU JingMiao,SUN WeiZheng,HUANG YiMin & ZHANG JianMing College of Resources and Environment,Hunan Normal University,Changsha ,China, Chinese Academy of Meteorological Sciences,Beijing ,China, Cold and Arid Regions Environmental and Engineering Research Institute,Lanzhou ,China.Relations between oxygen stable isotopic ratios in precipitation and relevant meteorological factors in southwest China[J].Science in China(Earth Sciences),2007,50(4):571-581. | |
| Authors: | Zhang XinPing Liu JingMiao Sun WeiZheng Huang YiMin Zhang JianMing |
| Institution: | 1. College of Resources and Environment,Hunan Normal University,Changsha 410081,China 2. Chinese Academy of Meteorological Sciences,Beijing 100081,China 3. Cold and Arid Regions Environmental and Engineering Research Institute,Lanzhou 730000,China |
| Abstract: | The correlations of isotopic ratios in precipitation with temperature, air pressure and humidity at different altitudes, in southwest China, are analyzed. There appear marked negative correlations for the δ 18O in precipitation with precipitation amount, vapor pressure and atmospheric precipitable water (PW) at Mengzi, Simao and Tengchong stations on synoptic timescale; the marked negative correlations between the δ 18O in precipitation and the diurnal mean temperature at 400 hPa, 500 hPa, 700 hPa and 850 hPa are different from the temperature effect in middle-high-latitude inland. Moreover, the notable positive correlation between the δ 18O in precipitation and the dew-point deficit ΔT d at different altitudes is found at the three stations. On annual timescale, the annual precipitation amount weighted mean δ 18O display the negative correlations not only with annual precipitation but also with annual mean temperature at 500 hPa. It can be deduced that, in the years with abnormally strong summer monsoon, more warm and wet air from low-latitude oceans is transported northward along the vapor channel located in southwest China and generates abnormally strong rainfall on the way. Meanwhile, the abnormally strong condensation process will release more condensed latent heat into atmosphere, and lead to the rise of atmospheric temperature during rainfall, but decline of the δ 18O in precipitation. On the contrary, in the years with abnormally weak summer monsoon, the abnormally weak condensation process will release less condensed latent heat into atmosphere, and lead to the decline of atmospheric temperature during rainfall, but increase of the δ 18O in precipitation. Supported by the National High Technology Research and Development Program of China (Grant No. 2002AA135360) and the Key Program of the Education Department of Hunan Province (Grant No. 03C210) |
| Keywords: | southwest China stable isotope precipitation temperature humidity correlation |
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