Increasing free-air 0°C isotherm height in Southwest China from 1960 to 2010 |
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基金项目: | National Basic Research Program of China (973 Program), No.2013CBA01801; National Natural Science Foundation of China, No.41161012 |
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摘 要: | 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℃ isotherm height in Southwest China and the relationships between surface air temperature and 0℃ isotherm height are discussed. The results indicated that the spatial distribution of 0℃ 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℃ isotherm height in Southwest China are latitude and huge massif. The annual 0℃ 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℃ isotherm height correlated well with surface air temperature.
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关 键 词: | 中国西南地区 等温线 空气 自由 地面气温 空间分布 探空资料 长期变化 |
收稿时间: | 2014-01-20 |
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