Increasing free-air 0°C isotherm height in Southwest China from 1960 to 2010 |
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Authors: | Mingjun Zhang Lei Dong Shengjie Wang Aifang Zhao Fang Qiang Meiping Sun Qiong Wang |
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Institution: | 1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou, 730070, China
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Abstract: | Based on the radiosonde data observed at 14 stations in Southwest China from 1960 to 2010, as well as the corresponding surface air temperature, the long-term change of free-air 0°C isotherm height in Southwest China and the relationships between surface air temperature and 0°C isotherm height are discussed. The results indicated that the spatial distribution of 0°C isotherm height is generally related with latitude, but the huge massif or plateau may complicate the latitude pattern. The two main regimes influencing the spatial patterns of 0°C isotherm height in Southwest China are latitude and huge massif. The annual 0°C isotherm height has increased by 35 m per decade in the recent decades, which is statistically significant at the 0.001 level. Generally, the increasing trend can be examined for each seasonal series, especially in winter (53 m per decade). The diversity of trend magnitudes for annual and seasonal series can also be detected at a spatial view, but generally 0°C isotherm height correlated well with surface air temperature. |
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Keywords: | Southwest China 0℃ isotherm height global warming radiosonde data |
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