青藏高原大气热源气候特征的研究

用NCEP/NCAR再分析资料和小波分析方法分析研究了1950-2005年青藏高原大气热源气候特征和变化特征,主要结论包括:(1)夏季青藏高原东部大气热源的强度明显较西部大.6月份,高原东部热源的强度是高原西部的近两倍,7月份的值也比西部大了40%以上.(2)青藏高原全区、东部和西部逐年平均的大气热源有明显不同的变化特征.高原全区年平均大气热源的变化主要是一个14年的时间尺度;高原东部不仅有14年的主要时间变化尺度,同时还有一个非常显著的2.6年的时间变化尺度;高原西部则不同,是一个不明显的1-2年的时间尺度.

Climatic feature of atmospheric heat source over Qinghai-Xizang Plateau

Using the NCEP/NCAR reanalysis data and the wavelet transform method the climate and change of the atmospheric heat source over Qinghai-Xizang Plateau between 1950 and 2005 is investigated.The result shows that(1) The intensity of the atmospheric heat source of the Eastern Plateau is greater than the Western Plateau in summer.In June the intensity of the heat source over the Eastern Plateau is nearly two times of the Western and in July the intensity of the heat source over the Eastern is 40% more than that over the Western.(2) The yearly average intensity of the atmospheric heat source over the whole area of the Qinghai-Xizang Plateau,the Eastern or the Western Plateau has obvious different change features.The change of the average atmospheric heat source in the whole Plateau is mainly a 14 year-scale in the Eastern Plateau.There is not only a main time change scale for 14 years,but also a very obvious 2.6 year-scale.In the Western Plateau it is a less obvious 1-2 year-scale.