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气象:2013,39(1):57-66
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GRAPES新云量计算方案的引进和影响试验
(1.中国气象科学研究院,北京 100081;2.国家气象中心,北京 100081;3.新疆维吾尔自治区气象台,乌鲁木齐 830002)
Introducing and Influence Testing of the New Cloud Fraction Scheme in the GRAPES
(1.Chinese Academy of Metorological Sciences, Beijing 100081;2.National Meteorological Centre, Beijing 100081;3.Meteorological Observatory of Xinjiang Uygur Autonomous Region, Urumqi 830002)
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投稿时间:2011-12-29    修订日期:2012-08-03
中文摘要: 在GRAPES模式中分别引进了EC云量计算方案和WRF云量计算方案,并与GRAPES现用的云量计算方案和简单云方案进行了对比数值试验,结果表明:(1)这4种云量计算方案都能较准确地模拟云分布,相对而言,EC云方案和简单云方案模拟地更为准确。(2)简单云方案模拟的总云量较多, GRAPES云方案和WRF云方案模拟的总云量偏少,EC方案模拟的总云量较为接近观测值。(3)在中国东部地区模拟的地面温度与观测基本接近,但在中国西部地区则误差较大;采用EC云方案时模式模拟的地面温度更接近观测值。(4)综合分析模拟的效果,认为EC云量计算方案模拟的效果最佳,可以作为GRAPES新云量计算方案引进的参考。
Abstract:By numerical experiments, the EC cloud fraction schemes (ECFS), the WRF cloud fraction schemes (WCFS), the GRAPES cloud fraction scheme (GCFS) and the simple cloud fraction scheme (SCFS) are compared. The results show that: (1) The cloud coverage is well simulated by all schemes, but the results by ECFS and SCFS are more accurate; (2) The total cloudiness simulation is more than observations in SCFS, that in GCFS and WCFS is less than observations, and that in ECFS is closer to observations; (3) The surface temperature is general agreement between simulations and observations in East China, but the temperature has much error in West China. By contrast, the simulation in ECFS is closer to observations; (4) Based on a comprehensive analysis, ECFS produces a better simulation. Thus ECFS can be used as a reference of a new cloud fraction scheme which would be introduced into GRAPES model.
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基金项目:国家自然科学基金(41275104)、公益性行业(气象)科研专项(GYHY201106044)和气象关键技术集成与应用项目(CAMGJ2012M57)共同资助
引用文本:
郑晓辉,徐国强,魏荣庆,2013.GRAPES新云量计算方案的引进和影响试验[J].气象,39(1):57-66.
ZHENG Xiaohui,XU Guoqiang,WEI Rongqing,2013.Introducing and Influence Testing of the New Cloud Fraction Scheme in the GRAPES[J].Meteor Mon,39(1):57-66.