| 6种地表热通量资料在伊朗—青藏高原地区的对比分析 |
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| 引用本文： | 刘超,刘屹岷,刘伯奇.6种地表热通量资料在伊朗—青藏高原地区的对比分析[J].气象科学,2015,35(4):398-404. |
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| 作者姓名： | 刘超 刘屹岷 刘伯奇 |
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| 作者单位： | 中国科学院大气物理研究所 大气科学和地球流体力学数值模拟国家重点实验室, 北京 100029;中国科学院大学, 北京 100029,中国科学院大气物理研究所 大气科学和地球流体力学数值模拟国家重点实验室, 北京 100029,中国科学院大气物理研究所 大气科学和地球流体力学数值模拟国家重点实验室, 北京 100029;中国气象科学研究院, 北京 100081 |
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| 基金项目： | 公益性行业(气象)科研专项(GYHY201406001);国家重点基础研究发展计划(2015CB453202);国家自然科学基金资助项目(91437219和41275088) |
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| 摘 要： | 基于JRA25、ERA40、ERA-Interim、NCEP1、NCEP2和20CR,对比了不同资料中气候平均(1979—2008年)伊朗—青藏高原感热通量和波文比的季节演变,以及夏季高原感热的年际变率和线性趋势。6套资料均表明,由春到夏亚洲大地形区域地表热状况的季节演变存在明显差异,青藏高原东南部低空气旋生成,一方面增多了局地降水,减弱了地表西风,造成潜热加强,感热减弱,波文比减小;另一方面加强了伊朗高原的东北风,抑制了当地降水,令感热加强,波文比增加,构成了青藏—伊朗高原感热通量季节演变的纬向非对称分布。虽然近30 a来伊朗高原(青藏高原)夏季感热线性增加(减小)的趋势一致,但不同资料所反映的伊朗—青藏高原夏季感热通量的年际变化差别明显。
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| 关 键 词： | 感热通量 波文比 伊朗—青藏高原 |
| 收稿时间： | 2014/3/22 0:00:00 |
| 修稿时间： | 2014/4/14 0:00:00 |
Comparison of six sensible heat flux datasets over the Iranian-Tibetan Plateaus |
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| LIU Chao,LIU Yimin and LIU Boqi.Comparison of six sensible heat flux datasets over the Iranian-Tibetan Plateaus[J].Scientia Meteorologica Sinica,2015,35(4):398-404. |
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| Authors: | LIU Chao LIU Yimin and LIU Boqi |
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| Institution: | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;University of Chinese Academy of Sciences, Beijing 100029, China,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China and State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;Chinese Academy of Meteorological Sciences, Beijing 100081, China |
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| Abstract: | The JRA25, ERA40, ERA-Interim, NCEP1, NCEP2 and 20th century reanalysis datasets are used to comparatively analyze the climatological-mean (1979-2008) seasonal evolution of sensible heat flux and Bowen ratio over the Iranian Tibetan Plateaus as well as the interannual variability and linear trend over the Plateau in summer. Results show that the seasonal evolution of surface heat flux over the Iran Plateau is quite different from that over the Tibetan Plateau from spring to summer. Over the southeastern Tibetan Plateau, a surface cyclone forms, which not only increases the local precipitation, weakens the surface westerly, strengthens latent heat flux and attenuates sensitive heat flux, but strengthens the surface northeasterly over the Iran Plateau, inhibits the local rainfall, enhances the sensible heat flux and increases Bowen ratio. Therefore, the seasonal evolution of sensible heat flux over the Iran-Tibetan Plateau is zonally asymmetric from spring to summer. Although the increasing(decreasing) trend of summer sensible heat flux over the Iran (Tibetan) Plateau was consistent during the recent 30 years, its interannual variability is distinctly different in the 6 datasets. |
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| Keywords: | Sensible heat flux Bowen ratio Iranian and Tibetan Plateaus |
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