| 青藏高原东西部积雪效应的模拟对比分析 |
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| 引用本文： | 刘华强,孙照渤,王举,闵锦忠.青藏高原东西部积雪效应的模拟对比分析[J].高原气象,2005,24(3):357-365. |
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| 作者姓名： | 刘华强 孙照渤 王举 闵锦忠 |
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| 作者单位： | 1. 南京信息工程大学,气象灾害与环境变化重点实验室,江苏,南京,210044;解放军理工大学,气象学院,江苏,南京,211101
2. 南京信息工程大学,气象灾害与环境变化重点实验室,江苏,南京,210044 |
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| 基金项目： | 国家自然科学基金项目(40375027)，南京信息工程大学“气象灾害与环境变化重点实验室”开放课题(K2107)共同资助 |
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| 摘 要： | 采用引入次网格尺度地形重力波拖曳的NCAR区域气候模式(RegCM2)，以SMMR微波逐候积雪深度观测值为依据，加入较合理的积雪强迫，通过数值模拟，研究了青藏高原(下称高原)东、西部积雪异常对后期区域环流的不同影响。模拟结果的对比分析表明，高原西部多雪对高原东部积雪存在正的反馈作用，有利于高原东部积雪的增加，而高原东部多雪对高原西部积雪的影响很小。高原西部积雪偏多和高原东部积雪偏多对后期大气温度场和高度场的影响具有基本相同的分布形态，只是影响强度有所不同。高原西部积雪的融化要迟于高原东部积雪，高原西部积雪效应的持续性较强。另外，高原西部多雪对高原东部积雪存在正的反馈作用，高原东部积雪的增加进一步加大了整个高原积雪的异常，因此，高原西部积雪偏多对后期环流的综合影响明显大于高原东部积雪偏多的影响。
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| 关 键 词： | 青藏高原 东、西部积雪异常 数值模拟 |
| 文章编号： | 1000-0534(2005)03-0357-09 |
Modeling Study on Anomalous Snow Cover Effects over Western and Eastern Parts of Qinghai-Xizang Plateau |
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| LIU Hua-qiang,SUN Zhao-Bo,WANG Ju,MIN Jin-zhong.Modeling Study on Anomalous Snow Cover Effects over Western and Eastern Parts of Qinghai-Xizang Plateau[J].Plateau Meteorology,2005,24(3):357-365. |
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| Authors: | LIU Hua-qiang SUN Zhao-Bo WANG Ju MIN Jin-zhong |
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| Institution: | LIU Hua-qiang 1,2,SUN Zhao-bo 1,WANG Ju 1,2,MIN Jin-zhong 1 |
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| Abstract: | The anomalous snow cover effects over the western and eastern parts of the Qinghai-Xizang Plateau(QXP) are compared by numerical simulations using the NCAR regional climate model (RegCM2) in which the gravity wave drag induced by subgrid-scale topography has been introduced. The simulations adopt relatively realistic snow mass forcings based on SMMR pentad snow depth data. The main results are summarized as follows: The heavier than normal snow cover over the western part of QXP can last more longer and has positive feedback on that over the eastern part of the Plateau, the former is favorable to the increasing of the latter, but the latter has little effects on the former. So, in contrast with the heavier than normal snow cover over the eastern part of QXP, when heavier than normal snow cover occurs over the western part of QXP, the total anomaly of snow cover over the Plateau is more obvious during the simulations. Both the heavier than normal snow cover over the western and eastern parts of QXP have effects on the atmospheric temperature and potential height fields, and their effects are with basically identical structure characteristics but with different strengths. The heavier than normal snow cover over the western part of QXP has more obvious effects on the regional atmospheric circulation in the later stages. |
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| Keywords: | Qinghai-Xizang Plateau Snow cover anomalies over east-and west-Plateau Numerical simulation |
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