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气象:2016,42(6):743-755
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中国区域高空三种气温、湿度资料交叉对比
(1.重庆市气象信息与技术保障中心,重庆 401147;2.国家气象信息中心,北京 100081;3.重庆市气象台,重庆 401147)
Cross Comparison of Three Kinds of Upper Air Temperature and Humidity Data over China
(1.Chongqing Meteorological Information and Technical Support Centre, Chongqing 401147;2.National Meteorological Information Centre, Beijing 100081;3.Chongqing Meteorological Observatory, Chongqing 401147)
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投稿时间:2015-08-14    修订日期:2016-01-07
中文摘要: 本文对比分析了2011—2013年中国区域L波段探空气温、湿度廓线,COSMIC掩星气温、湿度廓线和ERA Interim再分析资料的气温、湿度廓线之间的差异。对比显示,从时间变化来看,三者之间有很好的正线性相关关系。除10 hPa以上的少数层次外,三种气温资料之间互相吻合较好,彼此偏差范围在±0.4℃之间,偏差标准差在1~2℃,对流层中高层,L波段探空气温受太阳辐射影响较大,气温偏高,与COSMIC相比,L波段探空偏高最高可达到0.64℃。而对于相对湿度,三种数据存在明显差异。对流层中低层到对流层顶L波段探空存在不同程度的偏干,且有较明显的昼夜、季节和区域差异:白天、春夏季和南方潮湿气候区域偏干更明显。一般来说,在对流层顶附近区域,L波段探空相对湿度偏干较明显,200 hPa附近及以上L波段探空相对湿度转为偏湿。在对流层顶以下,L波段探空与COSMIC掩星、ERA Interim再分析相对湿度具有明显的正相关,对流层顶以上表现为负相关。
Abstract:In this study, the differences of temperature and humidity profiles over China obtained from L band sounding system, COSMIC occulation observation system and ERA Interim reanalysis data during the period 2011-2013 are compared. Time series comparisons show a good positive linear correlation among these three data sets. In addition to a few levels above 10 hPa, L band, COSMIC occultation and ERA Interim reanalysis temperature data accord well with each other, with the temperature bias ranging within ±0.4℃, and the standard deviation between 1℃ and 2℃. L band temperature is higher due to the great influence by solar radiation in the middle to upper troposphere, with the maximum bias of 0.64℃ when compared with COSMIC occultation. As for relative humidity, things are strikingly different. L band relative humidity data exhibit a varying degree of dry bias between the lower troposphere and the upper troposphere. Moreover, there are obvious diurnal, seasonal and climate regional differences, and the differences become even more evident during daytime, spring/summer period, and over south moisture climate areas. Generally, the dry bias is more obvious in the region near the top of troposphere; L band relative humidity turns to wet bias at above 200 hPa atmospheric pressure layer. L band and COSMIC occultation sounding relative humidity, ERA Interim relative humidity have positive correlations obviously below the top of troposphere. Nevertheless, there is a negative correlation above the tropopause.
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基金项目:国家科技支撑项目(2012BAC22B05)和公益性行业(气象)科研专项(GYHY201206028)共同资助
引用文本:
余君,李庆祥,廖捷,牟容,李奇临,2016.中国区域高空三种气温、湿度资料交叉对比[J].气象,42(6):743-755.
YU Jun,LI Qingxiang,LIAO Jie,MU Rong,LI Qilin,2016.Cross Comparison of Three Kinds of Upper Air Temperature and Humidity Data over China[J].Meteor Mon,42(6):743-755.