( 3 ) whether in summer or in winter in the district where topography is changed , compared to the modern simulation the simulated base climatology changes such as surface temperature , sea level pressure precipitation and so on which denotes the difference in land - ocean distribution can have effect on the climatology 试验模拟的气候基本态(如表面气温、海平面气压、降水、高低空流场)与现代模拟相比发生一定的变化，表明海陆差异对气候造成了一定的影响。
Apart from the original set of surface charts on temperatures , wind direction and wind speed , mean sea level pressure and weather conditions , the contents of the new computer upper - air forecast charts include spatial distributions of key weather elements at four different layers within the troposphere , as well as an explanatory note to facilitate understanding and application by the general public 内容方面，除原有的地面温度、地面风向及风速、平均海平面气压及天气情况外，新增的电脑预测图提供在大气对流层内四个不同高度的层面的主要气象资讯，以及一些相关的解释，方便市民理解及使用。
Based on summer precipitation in north china and the northern hemisphere sea level pressure ( slp ) and the pacific sea surface temperature anomaly ( ssta ) from 1900 to 2001 and ncep data from 1950 to 1999 , this paper studies inter - decadal variations of summer precipitation in north china and linkage of it and general circulation of atmosphere ( gca ) and enso cycle using eof and wavelet transform and composite analysis and correlation analysis and so on 本文采用1900 2001年华北夏季降水量、北半球海平面气压( slp ) 、太平洋海表温度距平( ssta ) 、 1950 1999年ncep资料等，利用eof 、小波变换、合成分析、相关分析等方法，研究了华北夏季降水的年代际变化及其与东亚大气环流、 enso循环的联系。
The information is generated by the observatory s high - speed computer using physical models and mathematical equations to simulate the evolution of weather systems . the computer simulations are presented as maps showing the surface temperature , surface wind speed and wind direction , mean sea level pressure and the state of the sky at various locations 这些预测资料是利用天文台高速电脑根据物理定律及数学方法计算出来的，以天气图显示，内容包括地面温度、地面风向及风速、平均海平面气压及天气的大致情况。
Some new features of the climate change in china in recent 50 years is shown by investigating the characteristics of the change of temperature , precipitation , relative humidity , wind speed and sea level pressure based on the 740 stations daily data in china , which is the most complete station data set in china processed by national meteorological center recently 利用国家气象中心最近整编的中国740站逐日资料，通过对中国温度，降水，相对湿度，地面风速，海平面气压这5个气象基本要素变化特征较为全面的分析，揭示了近50年中国气候变化的一些新特征。
Its interannual variation ' s main period is about 4 ~ 5a and the 7 ~ 8a ' s period exist too ; the interdecadal variation ' s main period of the australian high is about 15a . the interannual variation of australian high ( aah ) has correct correlation with antarctic oscillation and enso , and the enso ' s 4a period has the most important influence on the aah . ( 2 ) when the ah becomes stronger , the members of the whole aamcs are stronger following it . that is to say , in the years that the ah is stronger ( compared to the weak years of ah ) and on the horizontal circulation , the members of aamcs , including the ah , the cross - equator flow ( cef ) between 100 and 160 e , the south china sea south - west monsoom ( ssm ) , the south sea monsoon rough , the tropical easily flow , subtropical high ( sh ) , the mei - yu front , the mid - latitude effect , become stronger , and their positions are more southward ; in the meridional - right circulation , there are five circulations including classic monsoon meridional - cirle circulation and hadley circulation that become stronger in the strong years of ah than in the weak years of ah 本文采用ncep ncar再分析月平均的全球海平面气压场、高度场、海表温度场、高云量和cmap全球降水资料，以及中国160站逐月降水资料，分析了1948 2002年期间澳大利亚高压(以下简称澳高)的年际和年代际变化以及澳高年际变化对亚澳季风环流系统的影响，结果显示： ( 1 )澳高存在明显的年际和年代际变化，澳高年际变化以4 5年的周期变化为主，同时兼有7 8年左右的周期，而澳高的年代际变化则以15年左右的周期变化为主：澳高年际变化同时与南极涛动和enso有正相关，并且enso的4年左右的周期变化对澳高年际变化影响最大。
In addition , the ao index released by american climate prediction center ( cpc aoi ) fails to reflect the summer ao mode . in this paper , the time series of the leading principal component of the summertime ( june - september ) surface level pressure anomaly field over the domain poleward of 20 n is defined as the summertime ao index 此外，美国气候预测中心发布的全年北极涛动月指数不能表现夏季北极涛动型，本文将北半球热带外地区( 20 n以北)夏季( 6 - 9月)海平面气压场eof主模态的时间序列定义为夏季北极涛动指数。
