Within the same year , precipitation mainly concentrates in june , july , august and september , april and november were the turning point of annual rainfall ; the dates of effective rainfall are less , and the dates of ineffective rainfall are more . there is significant or highly significantly correlations between annual precipitation and rainfall from july to october 年降水量在时间分布上，主要集中在6 9月， 4月和11月为一年中降水量变化的转折点；年均降水日数88天，显效降水日数少，占同期的13 . 6 ；无效降水量占年降水量的比例高，近47 ； 7 10月的月降水量与其年降水量都有显著或极显著的相关性。
Based on the baseline climatic characteristics analysis of precipitation in liaoning , the discovery is then chiefly to study the effect of the corresponding period circulation and prophase ssta on rainfall in flood season in liaoning . some conclusions as followed : ( 1 ) there are many obvious differences in climatic characteristics between eastern and western parts of liaoning . precipitation decrease yearly . the precipitation anomalies take place mostly in flood season and it ' s spatial distribution vary with the changes of decades 本文在分析了辽宁省降水的基本气候特征的基础上，重点分析了辽宁汛期多少雨年同期环流影响因子和前期海温影响因子，结果表明：辽宁降水气候特征东西部差异明显，年降水量有减少趋势，汛期( 7 8月)降水异常最多发，降水异常的空间分布不同年代有不同的位相特征。
The precipitation of the year has 10 year periods , 2 . 5 - year oscillations have large variance in he precipitation of spring , winter and the year , especially in winter , the variance reach 36 . 3 % . the trend of temperature is positive in all the year , increasing in north region is very prominent , this trend conform to the temperature increasing trend of the northern hemisphere 但分地市来看，有些地市价水有明显的趋势变化。浙江省年降水量变化有明显的10年周期，春季、冬季及年降水量变化有2 5年周期，特别是冬季25年振荡的方差达到
Results show that the spatial distribution of the precipitation of the west is very uneven and obviously different in every quarter ; the characteristics of precipitation is droughty and less - rain in almost all part in winter . plentiful in summer , spring and autumn are transition phases , rainfall of autumn is more than that of spring in the most of region ; relative variability of each season rainfall is bigger than that of year , the variability is biggest in winter , but smallest in summer . alike between spring and autnmn and comprative in numerical value ; the area of least precipitation is in talimu basin and the northwest of chaidamubasin , not in the northwest of china 研究发现：西部地区年降水量的空间分布极不均匀，局地差异大；冬季绝大部分地区干旱少雨，夏季雨量丰沛，春秋季是过渡阶段，大部分地区秋雨多于春雨；各季降水量的相对变率大于年变率，夏季最小，冬季最大，春秋两季相似，数值上与冬季相差无几；我国雨量最少的地区位于柴达木盆地西北部和塔里木盆地，并不在我国的最西北角。
In warm events years , the areas where precipitation increased were less . main areas are chile and argentina of south american , somali , kenya and tanzania in east africa , turkey , iraq and iran in middle east , libya and algeria in north africa , namibia in southwest africa and botswana and zimbabwe in south of africa 在暖事件年，陆地年降水量增加地区不多，主要是南美的智利和阿根廷、东非索马里、肯尼亚和坦桑尼亚、中东的土耳其、伊拉克及伊朗、北非的利比亚和阿尔及利亚、西南非的纳米比亚及非洲南部的博茨瓦纳和津巴布韦。
Through analysing the correlation between the annual rainfall in years ( annual rainfall > ( x . - 1s ) mm ; and annual rainfall > ( x - 1s ) mm ) with notable rainfall variation from the average and monthly precipitation , we found that , apparent correlation not only exists between the monthly rainfall in rainy season and the annual rainfall , it also exists between the monthly rainfall in some 通过对偏离平均降水量较大的年份{年降水量偏多的年份： [ ( x + 1s ) mm ]年降水量偏少的年份:延x一ls ~ }年降水量与各月降水量相关性分析发现，除通常雨季月份降水量与年降水量存在显著的相关性外，在一些地区雨季前某些月份的降水量也与年降水量存在显著或极显著的相关性。
Detailed diagnoses is made on a heavy - hard rain in the northeast qinghai - xizang plateau using ncep data of 1 x 1 with 6h intervals , more complete and integrated conventional observational data and the data set of automatic meteorological stations in plateau and new generation doppler radar data and satellite images and etc . the following conclusions can be drawn : 1 . the distribution of heavy - hard rain , which is characteristics of valley topography in northeast qinghai - xizang plateau is obviously effected by topography . the distribution of yearly mean precipitation and the frequencies of heavy - hard rain in this area are descending from east to west 本文首先利用ncep时间间隔为6小时的1 1的格点资料、更全面、更为完整的常规探测资料和高原地区布设的自动气象站资料、新一代多卜勒天气雷达资料、卫星云图资料等对高原东北部地区大到暴雨的天气、气候特征及大尺度环流背景进行分析，形成对高原暴雨的整体认识，并为以后的数值模拟提供大尺度环流背景及依据，分析中发现： 1 、高原东北部地区大到暴雨的分布明显受到地形影响，年降水量和大到暴雨次数自东向西呈阶梯性递减趋势，分别在高原东北部的外流河谷地区和四川北部地区存在大值中心。
The temperature of upper reach is higher than that of lower reach , therefore , the river freezes up from lower reach to upper reach and breaks up from upper reach to lower reach . secondly , inner mongolia reach lies in inland area . it is far from ocean and controlled by mongolia high - pressure 其次，内蒙段处于内陆地带，离海洋距离远，暖湿气流难以到达，常为蒙古高压控制，呈典型的大陆性气候，年降水量少，夏季盛热短暂，冬季严寒漫长，河流结冰期长达4 - 5个月，大部分为稳定封冻河段。
And the main reason of the influence on surface water resource change is the marked climate warming , the annual vaporization increasing and the annual precipitation decreasing in the upstream area of yellow river , which result in the decreasing of the river flow rate or drying of the river 影响地表水资源变化的主要因素是由于进入90年代以来，黄河上游流域气候变暖趋势显著，年蒸发量表现出逐年增大的趋势，并且年降水量减少趋势更为显著，结果导致流量减少，出现断流。
The loess plateau region is in the center and northwestern china and has the typical continent climate , its " year precipitation mostly is 400mm and the water resources is shortage . the average runoff is under 1 / 3 that of china ; the water resources of per person is only 22 % of the national average level 黄土高原地区地处我国中北部，具有典型的大陆性气候特征，水资源短缺，大部分地区年降水量在400mm左右，多年平均径流不足全国平均的1 / 3 ，人均占有水资源量只有全国人均的22 。
