Abstract
This study summarized upper-air temperature change trends based on the monthly datasets of 14 sounding stations in the arid region of Northwest China during 1960–2009. Over the investigated period, the change in upper-air temperature measured at eight standard pressure levels shows that an obvious warming at 850–400 hPa, which decreases with altitude, changes to an apparent cooling at 300–50 hPa. There is a positive correlation between the surface and 850–300-hPa temperatures, but a negative correlation between the surface and 200–50-hPa temperatures. Over the full 1960–2009 record, patterns of statistically significant mid-lower tropospheric warming and upper tropospheric and mid-lower stratospheric cooling are clearly evident. Also, the annual temperature cycle indicates that the peak temperature shifts from July in the troposphere to February in the mid-lower stratosphere, suggesting the importance of seasonal trend analysis. We found that the warming in the mid-lower troposphere is more pronounced during the summer, autumn, and winter, whereas the cooling in the upper troposphere and mid-lower stratosphere is larger during the summer and autumn. Furthermore, there are also many regional differences in the upper-air temperature change, regardless of both season and layer.
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Acknowledgments
The research was supported by the National Basic Research Program of China (973 Program, no. 2010CB951003) and the Postgraduate Scholarships for Academic Innovation of East China Normal University.
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Chen, Z., Chen, Y., Xu, J. et al. Upper-air temperature change trends above arid region of Northwest China during 1960–2009. Theor Appl Climatol 120, 239–248 (2015). https://doi.org/10.1007/s00704-014-1166-3
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DOI: https://doi.org/10.1007/s00704-014-1166-3