载人探月：回顾与前瞻（续）     

任清苑 《天文爱好者》2011,(6):72-75

最近几年,欧洲、日本、俄罗斯、印度、英国、德国和韩国纷纷制定了新的探月计划,并逐步开始实施,从而在全世界掀起了新一轮探月热潮。近年来人类探索月球的热情之所以逐渐高涨,原因是多方面的,其中月球上汇集的历史谜团、独特的自然环境和丰富的资源,是相关国家下决心探月的重要原因。  相似文献   

What Causes the Springtime Tropospheric Ozone Maximum over Northeast Asia？   总被引：1，自引：0，他引：1  

Jae H. KIM  Hyunjin LEE 《大气科学进展》2010,27(3):543-551

Scientists have long debated the relative importance of tropospheric photochemical production versus stratospheric influx as causes of the springtime tropospheric ozone maximum over northern mid-latitudes. This paper investigates whether or not stratospheric intrusion and photochemistry play a significant role in the springtime ozone maximum over Northeast Asia,where ozone measurements are sparse.We examine how tropospheric ozone seasonalities over Naha(26°N,128°E),Kagoshima(31°N,131°E),and Pohang(36°N,129°E),which are located on the same meridional line,are related to the timing and location of the jet stream.The ozone seasonality shows a gradual increase from January to the maximum ozone month,which corresponds to April at Naha,May at Kagoshima,and June at Pohang.In order to examine the occurrence of stratospheric intrusion,we analyze a correlation between jet stream activity and tropospheric ozone seasonality.From these analyses,we did not find any favorable evidence supporting the hypothesis that the springtime enhancement may result from stratospheric intrusion.According to trajectory analysis for vertical and horizontal origins of the airmass,a gradual increasing tendency in ozone amounts from January until the onset of monsoon was similar to the increasing ozone formation tendency from winter to spring over mainland China,which has been observed during the build-up of tropospheric ozone over Central Europe in the winter-spring transition period due to photochemistry.Overall,the analyses suggest that photochemistry is the most important contributor to observed ozone seasonality over Northeast Asia.  相似文献   

鹿寨县“8.11”特大雷击伤亡事故分析     

王义耕  潘军  秦贻兰  王宛青  陈保昌 《广西气象》2010,(2):76-77,I0006

根据多普勒天气雷达回波与闪电定位仪资料,对2008年8月11日发生在鹿寨县的特大雷击伤亡事故进行分析得出,此次雷灾事故的直接致灾原因是石棉瓦小屋内的群众因跨步电压和旁络闪击以及接触电压而被击伤。  相似文献   

小型蒸发器失真记录分析   总被引：2，自引：1，他引：1  

杨玉霞  石慧兰  王桂兰  陈成国 《气象科技》2009,37(3):360-362

为提高小型蒸发器观测记录的准确性,对德州1998年1月至2007年12月蒸发量失真记录（负值、偏大可用、缺测记录）,结合当时天气状况等气象因素进行对比分析。结果表明,负值记录占失真记录的54．8％,集中在11至次年2月,多发生在非阵性的小雨（雪）、连阴雨、大雾天气;偏大可用记录、缺测记录多集中在6--8月,多发生在阵性强降水和湿度小、日照强、风大天气;造成失真记录的原因有人为操作不当、特殊天气、操作不科学等因素;针对不同天气条件下避免失真记录的发生提出了相应的处理方法。  相似文献   

防雷检测中测点电阻差异探讨     

古意瑾  易达仁  赵秀英 《气象研究与应用》2009,30(Z1)

针对防雷检测中不同测点电阻差异较大的问题,从电阻值的测量原理出发,详细分析了其差异产生的原因,并结合工作实际提出处理方式.  相似文献   

人工站与自动站风的自动观测资料差异分析   总被引：3，自引：0，他引：3  

程爱珍  丘平珠  韦华红  谭斐 《气象研究与应用》2010,31(4)

通过对侧风仪的构造及采集方法的差异分析,采用广西2004～2008年4个基准气候观测站人工站与自动站风的同步自动观测资料作对比分析,分析结果表明:人工站与自动站风的自动观测资料存在差异。短时风人工站与自动站差异比较大,平均风时间越长风速差异率就减少,风向相符率越大。风大时,人工站的观测数据比自动站大;10分钟平均风向风速人工站与自动站比较接近;极大风风速一致率及风向相符率比较低,说明瞬时风人工站与自动站差异最大。差异的原因主要是观测仪器制作材料不相同及观测方法不一致所造成。  相似文献   

遥测自动气象站数据卸载失败的原因分析     

吴华斌  张德苏  罗雄光 《气象研究与应用》2010,31(Z2)

以DZZ1-2型遥测自动气象站为例,针对在采集器工作正常的情况下,重点对造成自动气象站数据卸载失败的软件原因进行了探讨,并提出了数据缺测时的应对方法,以供同行参考。  相似文献   

鹿寨县"8.11"特大雷击伤亡事故分析   总被引：1，自引：1，他引：0  

王义耕  潘军  秦贻兰  王宛青  陈保昌 《气象研究与应用》2010,32(2):76-77,I0006

根据多普勒天气雷达回波与闪电定位仪资料,对2008年8月11日发生在鹿寨县的特大雷击伤亡事故进行分析得出,此次雷灾事故的直接致灾原因是石棉瓦小屋内的群众因跨步电压和旁络闪击以及接触电压而被击伤。  相似文献   

浅析2007年河南柞蚕单位产茧量的下滑原因     

张东  郭剑  杨伟伟 《气象与环境科学》2008,31(Z1)

分析了2007年河南柞蚕产茧量下滑的原因,结果表明:2007年春季严重干旱和气温偏高、寄生蝇的危害、微粒子病的发生等是造成产茧量下滑的主要原因.针对上述原因,提出了提早收蚁、留桩放拐、及时移蚕、良叶饱食和加强防治柞蚕饰腹寄生蝇和微粒子病等对策.  相似文献   

VARIATION OF PRECIPITATION DURING WINTER AS A CAUSE OF SUSTAINED DROUGHT IN GUANGDONG DURING THE PAST 50 YEARS     

纪忠萍  吴小芳  蔡洁云  胡丽甜  林少冰 《热带气象学报(英文版)》2010,16(1):86-90

The variation characteristics of precipitation during the winter (between October and the following March, to be referred to as just “the winter” hereafter) in Guangdong province during the past 50 years (from 1957 to 2006) and the relationship with Pacific SST are studied using the methods of Empirical Orthogonal Function (EOF) analysis, wavelet analysis, and correlation analysis. The results show that The Guangdong precipitation during the winter exhibits quasi-periodic significant oscillations of 40 years and 2 years; rainfall is less from the end of the 1950s to the start of the 1970s and from the end of the 1990s to the present than from the mid 1970s to the mid 1990s. The frequency of sustained drought is more than sustained flooding during the winter. The Guangdong precipitation during this time period is in significantly positive correlation to the equatorial central and eastern Pacific SST, but in a significantly negative correlation with the western and northern Pacific SST east of the Philippine Sea. 61.5% of the sustained drought occurred in the phase of negative anomalies of the Ni?o3.4 index and 38.5% in the phase of positive ones. A composite analysis of atmospheric circulation is performed for the positive and negative phases of the Ni?o3.4 region associated with the sustained drought. The results showed that a weak polar vortex, a strong trough in Europe and a ridge near Balkhash Lake, active cold air and consistent northerly wind anomalies controlling Guangdong at low levels, an inactive westerly low disturbance in the low-mid latitude of the Asian continent, and a weak southern branch westerly trough, are all mutual causes for the sustained drought.  相似文献