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李宏毅, 肖子牛. 2022. 青藏高原不同地区湍流输送特征及其与气象因子的关系[J]. 气候与环境研究, 27(4): 533−546. doi: 10.3878/j.issn.1006-9585.2021.21106
引用本文: 李宏毅, 肖子牛. 2022. 青藏高原不同地区湍流输送特征及其与气象因子的关系[J]. 气候与环境研究, 27(4): 533−546. doi: 10.3878/j.issn.1006-9585.2021.21106
LI Hongyi, XIAO Ziniu. 2022. Characteristics of Turbulent Transport in Different Areas of Qinghai–Tibet Plateau and Its Relationship with Meteorological Factors [J]. Climatic and Environmental Research (in Chinese), 27 (4): 533−546. doi: 10.3878/j.issn.1006-9585.2021.21106
Citation: LI Hongyi, XIAO Ziniu. 2022. Characteristics of Turbulent Transport in Different Areas of Qinghai–Tibet Plateau and Its Relationship with Meteorological Factors [J]. Climatic and Environmental Research (in Chinese), 27 (4): 533−546. doi: 10.3878/j.issn.1006-9585.2021.21106

青藏高原不同地区湍流输送特征及其与气象因子的关系

Characteristics of Turbulent Transport in Different Areas of Qinghai–Tibet Plateau and Its Relationship with Meteorological Factors

  • 摘要: 利用第三次青藏高原大气科学观测试验数据,对高原不同地区感热、潜热交换等湍流输送特征进行了分析,并进一步对比研究了其与气象环境因子的相关关系。结果表明:(1)高原各站之间感热和潜热的差异性较大,但大多在雨季潜热会大于感热。干燥的狮泉河站属于高寒荒漠地区,降水极少,全年感热都远大于潜热,波文比年平均值可达到20.0;湿润的比如站和嘉黎站潜热在4~10月均显著大于感热,波文比在4~10月的数值范围在0.27~0.88。(2)高原感热和潜热通量的季节变化与高原季风所处的地理位置有密切关系,高原中部的感热通量在3~5月达到最大值,而高原西部则在4~6月最大,可能与高原季风的活动有关。(3)通过与气象要素的相关分析表明,高原西部狮泉河站感热与地气温差的正相关关系最为显著,全年的相关系数可以达到0.905,在4个季节相关系数也均大于0.79,这可能与下垫面是裸地有关;高原中部安多站和那曲站感热与风速的正相关在夏季最为显著,比如站感热与风速的正相关在冬季最为明显,而狮泉河站感热与风速在春、夏季均有着十分显著的正相关。

     

    Abstract: Using the data from the third Qinghai–Tibet Plateau atmospheric science observation experiment, the turbulent transport characteristics of sensible heat flux and latent heat flux exchange in different areas of the plateau and their relationship with meteorological factors were systematically studied. The following results show that: (1) The sensible heat flux and latent heat flux vary greatly among different stations in the plateau, but in most areas, the latent heat flux is greater than the sensible heat flux during the rainy season. Shiquanhe station is a dry alpine desert area with very little precipitation; the sensible heat flux is much greater than the latent heat flux all year, and the average annual Bowen ratio can reach 20.0. From April to October, the latent heat flux is significantly greater than the sensible heat flux in the wet region of Biru and Jiali stations, with the Bowen ratio ranging from 0.28 to 0.88. (2) The seasonal variation of sensible heat flux and latent heat flux over the plateau is closely related to the geographical location of the plateau monsoon. The sensible heat flux in the central plateau reaches its maximum value from March to May, while that in the western plateau reaches its maximum value from April to June, which may be related to the activity of the plateau monsoon. (3) The correlation analysis with meteorological elements shows that the sensible heat flux in the Shiquanhe station of the western plateau has the most significant positive correlation with the temperature difference between ground and air, and the correlation coefficient for the entire year can reach 0.905, and the correlation coefficients were all greater than 0.79 in the four seasons, which may be related to the fact that the underlying surface is bare. The positive correlation between sensible heat flux and wind speed at the Anduo and Naqu stations was strongest in the summer; the positive correlation between sensible heat flux and wind speed at the Biru station was strongest in the winter, and the positive correlation between sensible heat flux and wind speed at the Shiquanhe station is strongest in the spring and summer.

     

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