| Variations of δ^18 O in Precipitation along Vapor Transport Paths |
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| 引用本文： | 章新平,刘晶淼,田立德,何元庆,姚檀栋.Variations of δ^18 O in Precipitation along Vapor Transport Paths[J].大气科学进展,2004,21(4):562-572. |
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| 作者姓名： | 章新平 刘晶淼 田立德 何元庆 姚檀栋 |
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| 作者单位： | [1]CollegeofResourcesandEnvironmentSciences,HunanNormalUniversity,Changsha410081 [2]ChineseAcademyofMeteorologicalSciences,Beijing100081 [3]ColdandAridRegionsEnvironmentalandEngineeringResearchInstitute,ChineseAcademyofSciences,Lanzhou730000 |
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| 摘 要： | Three sampling cross sections along the south path starting from the Tropics through the vapor passage in the Yunnan-Guizhou Plateau to the middle-low reaches of the Yangtze River, the north path from West China, via North China, to Japan under the westerlies, and the plateau path from South Asia over the Himalayas to the northern Tibetan Plateau, are set up, based on the IAEA (International Atomic Energy Agency)/WMO global survey network and sampling sites on the Tibetan Plateau. The variations, and the relationship with precipitation and temperature, of the δ^18 O in precipitation along the three cross sections are analyzed and compared. Along the south path, the seasonal differences of mean δ^18 O in precipitation are small at the stations located in the Tropics, but increase markedly from Bangkok towards the north, with the 51so in the rainy season smaller than inthe dry season. The δ^18 O sovalues in precipitation fluctuate on the whole, which shows that there are different vapor sources. Along the north path, the seasonal differences of the mean δ^18 O in precipitation for the stations in the west of Zhengzhou are all greater than in the east of Zhengzhou. During the cold half of the year, the mean δ^18 O in precipitation reaches its minimum at Uriimqi with the lowest temperature due to the wide, cold high pressure over Mongolia, then increases gradually with longitude, and remains at roughly the same level at the stations eastward from Zhengzhou. During the warm half of the year, the δ^18 O values in precipitation are lower in the east than in the west, markedly influenced by the summer monsoon over East Asia. Along the plateau path, the mean δ^18 O values in precipitation in the rainy season are correspondingly high in the southern parts of the Indian subcontinent, and then decrease gradually with latitude. A sharp depletion of the stable isotopic compositions in precipitation takes place due to the very strong rainout of the stable isotopic compositions in vapor in the process of lifting over the southern slope of the Himalayas. The low level of the δ^18 O in precipitation is from Nyalam to the Tanggula Mountains during the rainy season,but δ^18 O increases persistently with increasing latitude from the Tanggula Mountains to the northern Tibetan Plateau because of the replenishment of vapor with relatively heavy stable isotopic compositions originating from the inner plateau. During the dry season, the mean δ^18 O values in precipitation basically decrease along the path from the south to the north. Generally, the mean δ^18 O in precipitation during the rainy season is lower than in the dry season for the regions controlled by the monsoons over South Asia or the plateau, and opposite for the regions without a monsoon or with a weak monsoon.
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| 关 键 词： | 同位素稳定性 水汽循环 传输路径 温度 仓促性 |
Variations of δ18O in precipitation along vapor transport paths |
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| Zhang Xinping , Liu Jingmiao , Tian Lide , He Yuanqing and Yao Tandong.Variations of δ18O in precipitation along vapor transport paths[J].Advances in Atmospheric Sciences,2004,21(4):562-572. |
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| Authors: | Zhang Xinping Liu Jingmiao Tian Lide He Yuanqing and Yao Tandong |
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| Institution: | College of Resources and Environment Sciences, Hunan Normal University, Changsha 410081,Chinese Academy of Meteorological Sciences, Beijing 100081,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000 |
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| Abstract: | Three sampling cross sections along the south path starting from the Tropics through the vapor passage in the Yunnan-Guizhou
Plateau to the middle-low reaches of the Yangtze River, the north path from West China, via North China, to Japan under the
westerlies, and the plateau path from South Asia over the Himalayas to the northern Tibetan Plateau, are set up, based on
the IAEA (International Atomic Energy Agency)/WMO global survey network and sampling sites on the Tibetan Plateau. The variations,
and the relationship with precipitation and temperature, of the δ18O in precipitation along the three cross sections are analyzed and compared. Along the south path, the seasonal differences
of mean δ18O in precipitation are small at the stations located in the Tropics, but increase markedly from Bangkok towards the north,
with the δ18O in the rainy season smaller than in the dry season. The δ18O values in precipitation fluctuate on the whole, which shows that there are different vapor sources. Along the north path,
the seasonal differences of the mean δ18O in precipitation for the stations in the west of Zhengzhou are all greater than in the east of Zhengzhou. During the cold
half of the year, the mean δ18O in precipitation reaches its minimum at ürümqi with the lowest temperature due to the wide, cold high pressure over Mongolia,
then increases gradually with longitude, and remains at roughly the same level at the stations eastward from Zhengzhou. During
the warm half of the year, the δ18O values in precipitation are lower in the east than in the west, markedly influenced by the summer monsoon over East Asia.
Along the plateau path, the mean δ18O values in precipitation in the rainy season are correspondingly high in the southern parts of the Indian subcontinent, and
then decrease gradually with latitude. A sharp depletion of the stable isotopic compositions in precipitation takes place
due to the very strong rainout of the stable isotopic compositions in vapor in the process of lifting over the southern slope
of the Himalayas. The low level of the δ18O in precipitation is from Nyalam to the Tanggula Mountains during the rainy season, but δ18O increases persistently with increasing latitude from the Tanggula Mountains to the northern Tibetan Plateau because of the
replenishment of vapor with relatively heavy stable isotopic compositions originating from the inner plateau. During the dry
season, the mean δ18O values in precipitation basically decrease along the path from the south to the north. Generally, the mean δ18O in precipitation during the rainy season is lower than in the dry season for the regions controlled by the monsoons over
South Asia or the plateau, and opposite for the regions without a monsoon or with a weak monsoon. |
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| Keywords: | stable isotope vapor transport path temperature precipitation |
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