一个诊断极区平流层温度变化的近似方程的检验及应用
投稿时间: 2017-11-27  最后修改时间: 2018-03-10  点此下载全文
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刘仁强 南京信息工程大学 rq_liu@nuist.edu.cn 
中文摘要:首先给出了一个诊断极区平流层温度变化的Hu and Tung(2002)形式的近似方程及其滑动累加计算方案,根据此方案并采用MERRA-2再分析1980-2000年的日资料,计算了北半球极区低平流层100hPa上逐月的温度增量项、动力加热项和非绝热加热项,以及各项的线性趋势。结果表明,各月温度增量项与累积的动力和非绝热加热之和在气候平均的年循环意义上接近平衡,而且它们的趋势也近似平衡。进一步通过多元回归,得到了动力和非绝热加热作用对当前月温度趋势的分别贡献,动力作用是北极低平流层冬季温度趋势的主导因素并且在冬季内不一致,而非绝热作用在其它季节是主导因素。
中文关键词:平流层温度变化  热通量近似  动力加热  非绝热加热
 
Verification and application of an approximate thermodynamic equation for diagnosing the polar stratospheric temperature changes
Abstract:First we give an approximate thermodynamic equation, which is in the form of Hu and Tung (2002) for diagnosing the polar stratospheric temperature changes, and its time-sliding calculation scheme. Then according to this scheme and using the MERRA-2 reanalysis daily data during the period 1980-2000, we calculate the terms of monthly temperature increment, dynamical heating and diabatic heating, respectively, and their linear trends, at 100 hPa in the Arctic lower stratosphere. It is shown that the monthly temperature increment term and the sum of the cumulative dynamical and diabatic heating, as well as their trends, are roughly balanced during the annual cycle of climatology meaning. Based on a multivariate linear regression, we further obtain the respective contributions of the dynamical and diabatic heating to the current month temperature trends. The dynamical contribution to the temperature trend is dominant and varying with different months in the Arctic lower stratosphere wintertime, while the diabatic contribution dominant in other seasons.
keywords:stratospheric temperature change  heat flux approximation  dynamical heating  diabatic heating
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