| 摘要: |
| 基于NCEP/NCAR再分析资料，利用气温异常的倾向方程分析2016/2017年中国华北地区（100~115 °E，35~45 °N）、西南地区（85~102 °E，22~33 °N）和南方地区（108~118 °E，22~33 °N）的暖冬事件。结果表明西南和华北地区的平流作用占主导地位，而2016/2017年冬季中国南方暖冬主要是非绝热加热引起的。进一步通过水汽收支平衡的分析表明，局地水汽异常对2016/2017年中国南方暖冬有重要贡献，而其中土壤的水汽贡献约占50%。可能的机制如下：大气中正的水汽异常引起辐射加热增多，导致气温升高，土壤的感热增大，土壤温度升高，潜热通量变大，从而向大气的水汽输送增多，更多的水汽将导致更高的温度。 |
| 关键词: 暖冬 非绝热加热 平流输送 |
| DOI：10.16032/j.issn.1004-4965.2019.026 |
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| 基金项目: |
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| EFFECT OF DIABATIC HEATING INDUCED BY REGIONAL WATER VAPOR ANOMALIES IN 2016/2017 WARM WINTER OVER THE SOUTH OF CHINA |
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ZHENG Bin, HUANG Yan-yan, GU De-jun
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Guangzhou Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratoryof Regional Numerical Weather Prediction, CMA, Guangzhou 510641, China
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| Abstract: |
| NCEP/NCAR reanalysis data are used to analyze a warm winter in 2016/2017 in three regions of China, i.e., North (100~115 °E, 35~45 °N), Southwest (85~102 °E, 22~33 °N) and South (108~118 °E, 22~33 °N), by analyzing the equation of air temperature budget. The results indicate that in the 2016/2017 warm winter event advection plays a main role over the north and southwest of China, but diabatic heating dominates over the south of China. Further analysis of moisture budget suggests that diabatic-heating-induced regional water vapor anomalies, about half of which come from soil, give great contribution to the 2016/2017 warm winter event over the south of China. A possible positive feedback mechanism is: positive water vapor anomalies increase radiation heat to warm the air, and then downward sensible heat flux increases soil temperature; as a result, larger upward latent heat flux leads to more water vapor, and then another cycle repeats. |
| Key words: warm winter diabatic heating advection |
