初夏的那一抹明媚

每一个季节,都有自己的季节特质。初夏,送走了暮春和煦中的那份料峭,却又尚未进入盛夏的溽热,它给人的感觉是爽朗而又明媚。     

陕西省关中,陕南地区初夏干旱特点及预测研究

应用1958～1995年38a6月份陕西省关中、陕南地区24站的降水资料，研究了关中、陕南6月份的降水特点；选取其中12站作为资料站，计算出关中、陕南6月份的降水指数f,研究了关中、陕南初夏（6月份）的干旱特点；就初夏干旱发生的高空500hPa环流形势与历年平均状况进行了对比分析，并对初夏干旱作了预测。     

地震灾区火凤凰——云南省公安消防部队"6·3"地震救灾纪实

初夏之夜,笼罩在黎明前的黑暗之中的云南省普洱市宁洱县城,依然显得静谧祥和。家住新民街的宁洱县消防大队教导员李双,被一阵剧烈的震动惊醒。"我当时就意识到地震了!"李双拖着家人跑到院子里时,被眼前的景象惊呆了,附近的许多房屋在顷刻之间支离破碎,一场毫无征兆的大地震发生了,时间定格在2007年6月3日5时     

Online monitoring of water-soluble ionic composition of PM10 during early summer over Lanzhou City

Lanzhou is one of the most aerosol-polluted cities in China. In this study, an online analyzer for Monitoring for AeRosols and GAses was deployed to measure major water-soluble inorganic ions in PM10 at 1-hour time resolution, and 923 samples were obtained from Apr 1 to May 24, 2011. During the field campaign, air pollution days were encountered with Air Quality Index more than 100 and daily average concentration of PM10 exceeding 150 μg/m3. Based on the variation of water-soluble ions and results of Positive Matrix Factorization 3.0 model execution, the air pollution days were classified as crustal species- or secondary aerosol-induced, and the different formation mechanisms of these two air pollution types were studied. During the crustal species pollution days, the content of Ca2+increased and was about 2.3 times higher than the average on clear days, and the air parcel back trajectory was used to analyze the sources of crustal species. Data on sulfate, trace gases and meteorological factors were used to reveal the formation mechanism of secondary aerosol pollution. The sulfur oxidation ratio(SOR) was derived from the 923 samples, and the SOR had high positive correlation with relative humidity in early summer in Lanzhou.     

问君梅雨知多少 防潮防病最重要

梅雨 每年初夏,江淮流域一带经常出现一段持续较长的阴霾多雨天气。此时,正值江淮梅子熟透、梅林飘香时节,却逢连绵阴雨,人们就说其为“黄梅雨”或“梅雨”。因为连续阴雨,物品极易发霉,故又称为“霉雨”。我国有“梅雨”的说法,至少可以追溯到西晋,后经南北朝、唐、宋、元、明、清各代,     

今年夏天炎热将创纪录

最近,我国各地已经感受到热浪袭来。不少地区在二月份就达到了25摄氏度左右,让人感到似乎初夏突然来临。而在南半球的澳大利亚,也已经历了多日的高温天气。英国气象学家最近发表气象预测报告说,今年夏天将很“汗”,将迎来近年少有的炎热夏季,人们需要做好避暑的充分准备。