INVESTIGATION OF LAGGED CORRELATION BETWEEN THE TEMPERATURE OF CHINA AND THE GLOBAL OUTGOING LONGWAVE RADIATION IN 1974-1985     

Tao Zuyu  Zhu Yuanjing  Tomas Ting 《Acta Meteorologica Sinica》1991,5(1):16-27

1-12 month lagged correlations between winter temperatures at 22 stations in China and the global dis-tribution of the Outgoing Longwave Radiation(OLR)are investigated.The basic results are:(1)Themonthly averaged temperatures of Dec.,Jan.and Feb.of China are correlated to the global distribution ofOLR of Oct.,Nov.and Dec.,respectively.It is consistent with the response period(about 50 days)of 500hPa geopotential height field in extratropical latitudes to the thermal forcing in tropical latitudes,and also consis-tent with the Walker cell of a 40-60 day oscillation.(2)There is a significant positive correlation betweenthe winter temperature of the most part of China and the OLR in the Gulf of Mexico.It shows that whenthe thermal forcing of the Gulf of Mexico is stronger,the excited barotropic instability of westerlies in northernAtlantic could influence the East Asian circulation and cause the temperature of China to be below normal.(3)The temperature around the Tibetan(Xizang)Plateau is negatively correlated to the OLR in western equa-torial Pacific,showing that when the Walker cell is stronger,the local Hadley cell in Southeast Asia isstronger and it causes the temperature around the Tibetan Plateau to be higher than normal.  相似文献   

VARIATIONS IN THE TELECONNECTION INTENSITY INDICES AND THEIR REMOTE RESPONSE TO THE EL NINO EVENTS IN THE NORTHERN HEMISPHERE          下载免费PDF全文

朱乾根  施能 《Acta Meteorologica Sinica》1992,(4)

In this study,the monthly and seasonal teleconnection intensity indices of the Pacific/North American(PNA),Western Atlantic(WA),Western Pacific(WP),Eastern Atlantic(EA)and Eurasian(EU)patterns for the periodfrom 1951 through 1990 are calculated.On this basis,their climatic variations and the relationship between the fiveteleconnection intensity indices and the El Nino events are examined.It is noted that when El Nino is at its mature stage(winter),the weak WP pattern is mainly characteristic of the circulation and the strong PNA pattern is the next.Insummer when El Nino occurs and develops,the strong EU,weak WP and weak WA patterns are the main characteris-tics without the PNA circulation anomalies.Finally,by the nonlinear mapping method a nonlinear mapping diagram isestablished for diagnosing El Nino using three summer teleeonuection intensity indices and May and August SouthernOscillation Indices(SOIs).Thus,the El Nino phenomenon occurring in 1991 is diagnosed.Besides,the winter atmos-pheric circulation of the 1991/1992 El Nino is found to be the weak WP pattern and the PNA pattern is also weak.  相似文献   

Metamorphic peak geothermobarometry in the Furulund Group, Sulitjelma, Scandinavian Caledonides: implications for uplift   总被引：1，自引：0，他引：1  

A. P. BOYLE  R. K. WESTHEAD 《Journal of Metamorphic Geology》1992,10(5):615-626

Regional metamorphism in the Sulitjelma area of the arctic Scandinavian Caledonides has produced a series of Barrovian zones, from chlorite through to kyanite in more aluminous pelites, which transect the major lithological boundaries in a large nappe unit of the Köli Nappe Complex. The metamorphic zones are inverted, and metamorphic grade increases westwards from the foreland to the hinterland. The Furulund Group comprises a mixed sequence of originally flysch-like sediments which crop out over the whole range of the observed Barrovian zones, but are usually too calcareous to develop the characteristic Barrovian aluminous phases staurolite and kyanite. Instead, above the garnet isograd, the Furulund Group pelites and semi-pelites have widely developed hornblende porphyroblasts in the common assemblage Grt + Pl + Bt + Ms + Qtz ± Hbl ± Ep ± Czo ± Chl ± Cal ± Dol. Thermobarometric estimates of metamorphic peak P–T conditions (i.e. at maximum recorded temperatures) from this assemblage, using three different methods, indicate a westward increase of both pressure and temperature over a distance of 14 km away from the garnet isograd towards the hinterland of the orogen, independent of topographic level and without change in the common mineral assemblage. The increased peak pressure in the west indicates greater initial burial and subsequent exhumation in the hinterland than towards the foreland. Restoration indicates that the Furulund Group has been subjected to substantial eastward bulk tilting after peak metamorphic conditions. Whilst this enhances the overturning of the metamorphic zones, the amount of tilting was not sufficient to cause the overturning.  相似文献   

热带西太平洋暖池的热状态及其上空的对流活动对东亚夏季气候异常的影响   总被引：120，自引：32，他引：120  

黄荣辉  孙凤英 《大气科学》1994,18(2):141-151

本文利用１９７８－１９８９年热带西太平洋暖池的表层与次表?层海温、高云量与降水等观测资料分析了热带西太平洋暖池的热状态及其上空的对流活动对东亚夏季气候异常的影响。分析结果表明：热带西太平洋暖池的热状态及其上空的对流活动对东亚夏季气候异常起着十分重要的作用。当热带西太平洋暖池增暖时，从菲律宾周围经南海到中印半岛上空的对流活动将增强，西太平洋副热带高压的位置偏北，我国江淮流域夏季降水偏少；反之，则菲律宾周围的对流活动减弱，副热带高压偏南，江淮流域的降水偏多，黄河流域的降水偏少，易发生干旱。观测事实还表明，当热带西太平洋暖池上空的对流增强后，从东南亚、经东亚到北美西海岸上空大气环流的异常呈现出一个遥相关型—东亚太平洋型。  相似文献   

川东盛夏伏旱非绝热热流量场特征   总被引：1，自引：0，他引：1  

刘富明  李跃清 《大气科学》1994,18(4):423-430

本文分析了川东伏旱与大气非绝热热流量的关系，结果表明：与四川“西涝东旱”气候特征相关的川东伏旱与北半球大范围非绝热热流量异常相联系。夏季月平均非绝热热流量距平场，亚欧范围内差异显著。重旱年极地维持1波，无旱年维持２波，90—120°E、20—40°N关键区，重旱年北正南负、东正西负；轻旱年东正西负；无旱年北负南正、东负西正。川东重旱年、轻旱年为负距平区，无旱年为正距平区。并且，青藏高原加热作用，通过影响东亚大气环流系统而对川东伏旱形成有重要影响。最后，提出了根据冬-夏地气遥相关事实，应用参数化方法，建立川  相似文献   

夏季北半球500hPa月平均场遥相关型及其与我国季风降水异常的关系   总被引：9，自引：0，他引：9  

施能  朱乾根 《南京气象学院学报》1994,17(1):1-10

用一点相关法计算了盛夏北半球５００ｈＰａ遥相关型，得到７月份北半球存在７个遥相关型，８月份有６个遥相关型。研究了它们的中心，计算了各遥相关型的历年强度指数（１９５１－１９９０），研究了它们的年际变化、月际变化。指出７月份的东亚太平洋型、北美东西遥相关型；８月份的ＥＡＰ型、欧亚型与我国盛夏季风降水关系密切。１９９１年夏季发生的弱ＥＡＰ型是江淮流域大涝的一个重要原因。  相似文献   

北半球冬季环流异常对我国东北夏季长期天气过程的影响   总被引：4，自引：1，他引：4  

孙永罡  范玉华 《南京气象学院学报》1994,17(2):153-158

用北半球１４个冬季的５００ｈＰａ候距平高度场和１４个夏季东北地区温度和降水候距平资料，分析了冬季环流异常对次年夏季温度和降水异常的影响，发现北半球冬季环流异常的显著区与冬季大气活动中心或超长波槽脊相联系；与我国东北地区夏季温度和降水异常关系密切。在Ｅｌ Ｎｉｎｏ和反Ｅｌ Ｎｉｎｏ年，这种现象更为明显。  相似文献   

初秋500hPa大气环流遥相关型及其与我国温度场关系     

施能  倪东鸿 《南京气象学院学报》1994,17(3):391-395

研究了北半球初秋５００ｈＰａ高度场的６个遥相关型特征及其与冬季遥相关型的区别，和其强度与我国初秋气温场的关系。指出我国大部地区的气温场特征与其中４个环流型强度的关系密切。  相似文献   

近55年宁夏秋季降水的时空变化特征及其大尺度环流背景   总被引：9，自引：2，他引：7  

陈豫英  陈楠  王式功  陈晓光  郑广芬  陈晓娟  穆建华 《干旱区地理》2009,32(1)

利用1951-2005年宁夏秋季降水、SST、NCEP/NCAR全球再分析资料及74个环流特征量,使用REOF、小波变换、相关分析等多种统计方法,分析了宁夏秋季降水的时空变化特征及其与SST和北半球500 hPa高度场的遥相关.结果表明:近55年,宁夏秋季降水呈下降趋势,异常敏感区在宁夏北部和六盘山区;1979年前后发生突变,突变后降水明显减少,有显著的3年和6年左右周期变化;加利福尼亚西岸海区是影响宁夏秋季降水的SST关键区,3～5月是关键期,SST冷(暖)水位相与宁夏秋季降水偏多(少)相对应;3～5月加利福尼亚西岸海区SST在1979年前后发生突变,突变前后北半球中低纬度地区500 hPa高度场变化显著,新疆脊、西太平洋副高和印缅槽是宁夏秋季降水的主要影响系统.  相似文献   

北半球冬季WA遥相关型影响东亚初夏季风的可能途径   总被引：4，自引：0，他引：4  

徐海明  何金海  管兆勇  王黎娟 《南京气象学院学报》2000,23(3):361-369

通过ＳＶＤ和滞后相关分析,研究了北半球冬季ＷＡ遥相关型与后期初夏东亚季风的联系及可能的影响途径。结果表明,北半球冬季ＷＡ型与东亚初夏季风存在密切的联系,其影响东亚初夏季风的过程可概述为：在北半球冬季,ＷＡ型强弱可引起西北大西洋海温异常,由于海温具有很好的持续性,这种海温异常可一直持续到春季和初夏６月份;而春季和初夏６月份,北大西洋海温异常又反过来对大气环流产生影响,引起欧亚中高纬大气环流异常,特别  相似文献