| 青藏高原化雪迟早的辐射效应对季节变化的影响 |
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| 引用本文： | 吴国雄,薛纪善,王在志,刘辉,何安国,赵字澄.青藏高原化雪迟早的辐射效应对季节变化的影响[J].甘肃气象,1995(1). |
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| 作者姓名： | 吴国雄 薛纪善 王在志 刘辉 何安国 赵字澄 |
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| 作者单位： | 大气科学和地球流体力学国家重点实验室，中国科学院大气物理研究所 |
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| 摘 要： | 利用大气物理所九层菱形截断１５波大气环流谱模式进行数值试验，研究青藏高原化雪迟早之辐射效应对季节变化的影响。共进行了正常态（ＣＯＮ），化雪迟（ＭＳＮ），化雪早（ＬＳＮ）三个试验。高原第ｉ月积雪状况在ＣＯＮ中取ｉ月气候平均值，在ＭＳＮ中取（ｉ—１）月的气候平均状况，在ＬＳＮ中则取（ｉ＋ｌ）月的气候状况。每个试验都从１月１日气候平均状况出发，积分至１０月。通过比较各试验结果分析化雪迟早的气候效应。结果表明，高原化雪的迟早改变了进入地表的辐射通量，从而改变了地表对大气的加热，由此影响东亚地区的季节变化。化雪迟则高原上春季进入地表的辐射通量减少，导致地表的潜热通量和向外长波辐射减弱。尤其是感热通量的减弱更为严重。一般情况下，高原在冬季为大气的感热汇，３月下旬变为大气的感热源。多雪时，这一变化推迟了近１个月。与之相应，２００ｈＰａ高原上空的南亚高压建立迟，印度西南季风爆发也迟。造成夏季风降水在印度偏少，在中印度半岛和广东沿海偏多。
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| 关 键 词： | 青藏高原，化雪迟早，辐射效应，季节影响 |
The Modification of Radiation Effect of Snowmelt Sooner or Later on the Seasonal Variation in the Qinghai_Xizang Plateau |
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| Wu Guoxiong, Xue Jishan, Wang Zaizhi, Liu Hui He Anguo, Zhao Yucheng.The Modification of Radiation Effect of Snowmelt Sooner or Later on the Seasonal Variation in the Qinghai_Xizang Plateau[J].Gansu Meteorology,1995(1). |
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| Authors: | Wu Guoxiong Xue Jishan Wang Zaizhi Liu Hui He Anguo Zhao Yucheng |
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| Abstract: | Using atmosphere general circulation spectral model of 9 level truncated 15 waveof the rhonbus being to the Institute of Atmosphere Physics engage in numerical experi-ment ,the modification radiation effect of snowmelt on the seasonal variation in the Qiiighai-Xizang Plateau has been studied. These experiments are normal state(CON),lately snownlelt(MSN) and early snowmelt(LSN).In CON the perpetual snow was taken from month(i) cli-matological average,in MSN was taken from month(i 1),and in LSN was taken frommonth(i+ 1 ).Every experiment was begining from Jan,1 in tergrated to Oct. Compd.redthese resultes of experiment and to analysis the climatic effects of snowmelt. The resukshows the snowmelt sooner or later of QinghaiXizang Plateau has changed the radiative fluxof enter into surface,and changed heat transfer from surface therefore influenced the seasonalvariation in East Asia region, If latly snownielt , the radiative flux of enter into surface isweaken in the plateau during the spring and causes weaken the latent heat flux and long-wave radiation of surface,especially the sensible heat flux are weaken more serious, In gcner-al,in winter Qinghai Xizang Plateuu is the sensible heat sink of atomsphere,in the last dekadof March it changed to sensible heat source of atmosphere. On a snowy year,this cliange putoff about one month. Thus 200 hPa south asia high pressure will later establish,and the lndi-an monsoon also outbreak later, This situation caiise the precipitation of summer inonsoon to less than average in Indian,but to much in mid Indian peninsula ant Guangdong coastal. |
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| Keywords: | Qinghai Xizang Plateau snowmelt sooner or later radiation effort season -al variation |
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