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为探讨地面气象遥测仪所测得的记录能否代替人工观测记录的问题 ,对丹东 1999~2001年遥测记录与人工观测记录进行对比分析 ,得出遥测记录可代替人工记录的结论。 相似文献
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在气象历史资料记录中与天气状况相关的记录有云量、云高、能见度、日照时数和天气现象等,没有直接的天气状况记录。特别是在记录异常情况下,判定历史天气状况要根据相关记录综合判断,以防误判。在向用户提供资料服务时,应 相似文献
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统计某气象站2000-2004年云观测记录编码情况,指出基层气象台站云的观测记录存在复杂云天记录简单化、一般云天记录模式化的趋势和现象,分析其产生原因并提出克服这种现象,提高云观测记录准确性的对策建议. 相似文献
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为探讨地面气象遥测仪所测得的记录能否代替人工观测记录的问题,对丹东1999~2001年遥测记录与人工观测记录进行对比分析,得出遥测记录可代替人工记录的结论。 相似文献
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小型蒸发器失真记录分析 总被引:2,自引:1,他引:1
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
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台站观测和百班验收中,发现能见度和天气现象记录中存在问题:①能见度观测记录偏小,如在记录中湿度不是很大但有雾记录;②云量较多的低云与雾并存,如有10成的Scop或St与雾同记;③有较大降水影响能见度时记录了短时雾。 相似文献
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2006年全球气候异常,多项纪录被打破 总被引:1,自引:1,他引:1
以世界气象组织发布的2006年全球变化状况的报告为基础,结合全球相关的资料报道,总结了2006年全球的气候变化特征:2006年为近百年来第5个最暖年,全球出现了大范围的气候异常,包括欧洲最暖的秋天、澳大利亚的严重干旱、非洲大角地区的极端干旱和严重洪涝、菲律宾群岛的暴雨,以及北极海冰面积的进一步减少等。 相似文献
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2003年夏季中国江南异常高温的分析研究 总被引:36,自引:6,他引:30
2003年夏季在中国江南出现了大范围异常高温天气,无论其绝对高温值、还是持续时间之长都创下了历史记录,给工农业生产及人民生活造成巨大损失.作者对异常高温发生的直接原因及其可能机制进行了初步分析,发现西太平洋副热带高压的极度持续偏强和西伸是直接原因,而西太平洋副热带高压形势的持续异常是多系统综合作用的结果.初步分析表明,热带太平洋一印度洋海温、中西太平洋跨赤道气流异常、平流层过程以及全球增暖的背景条件是其重要机制. 相似文献
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Gilbert W. Bassett Jr. 《Climatic change》1992,21(3):303-315
Global surface temperature was a record in 1988. What is the probability that this record will be surpassed in the next few years? Answers are provided given a variety of simple statistical models for temperature. The answers illustrate how record breaking is influenced by alternative model specifications. Estimates for the probability of a record are shown to range widely. If annual temperature is independent and identically distributed then a new record is unlikely. But probabilities increase rapidly if there is a trend or autocorrelation. Estimates of the probability of a record using data on global temperature suggest that another record in the next few years would not be a rare event. 相似文献
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2008年可能是自1850年开始有器测记录以来全球第10个最暖的年份,全球海面和陆面综合气温比1961-1990年的年平均高0.31℃,150 a来最热的10个年份都集中在最近12 a里,全球气候变暖的趋势仍在持续。北极的海冰面积在融化期降至自1979年卫星测量以来的第2个最低点;同时,2008年极端天气气候事件频发,世界许多地方出现了洪灾、持续性严重干旱、冰雪风暴、热浪和寒潮等;拉尼娜现象在2月份呈峰值状态,以后逐渐减弱至近中性状态;南极臭氧洞进一步增大。 相似文献
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Ten meter firn cores were collected during the Swedish Antarctic Expedition to Dronning Maud Land, in 1988/89. The oxygen isotope stratigraphy in the cores was used to obtain a proxy-temperature record and a surface accumulation record for the last 15–30 years. The 18O record from cores on the ice shelf and the escarpment area, below 2000 m a.s.l., show high variability and little year-to-year correspondence to each other or with the temperature record from nearby Halley. A stacked firn core record was produced to avoid local variability and minor dating errors; this record shows more similarities to the Halley temperature record. The 18O records from high altitude cores show a much better correspondence to the Halley temperature record over the last 30 years, implying that the source of precipitation is more stable compared to the coastal area. The welldeveloped 18O stratigraphy in the cores from coastal Dronning Maud Land makes it promising for future work using ice cores as paleoclimatic records. 相似文献
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The North Atlantic Oscillation (NAO) obtained using instrumental and documentary proxy predictors from Eurasia is found to be characterized by a quasi 60-year dominant oscillation since 1650. This pattern emerges clearly once the NAO record is time integrated to stress its comparison with the temperature record. The integrated NAO (INAO) is found to well correlate with the length of the day (since 1650) and the global surface sea temperature record HadSST2 and HadSST3 (since 1850). These findings suggest that INAO can be used as a good proxy for global climate change, and that a ~60-year cycle exists in the global climate since at least 1700. Finally, the INAO ~60-year oscillation well correlates with the ~60-year oscillations found in the historical European aurora record since 1700, which suggests that this ~60-year dominant climatic cycle has a solar–astronomical origin. 相似文献
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2009年云南秋季特大干旱的气候成因分析 总被引:7,自引:0,他引:7
2009年秋季至2010年初夏,云南遭受了有资料记录以来最严重的干旱,其中2009年秋季是有资料记录以来降水偏少最明显的年份,全省平均降水比历年同期偏少50%以上。通过诊断方法分析了云南秋季降水和大气环流异常的特征,结果表明在多年平均情况下,云南秋季大部分地区的降水占年降水总量的20%以上,对年降水量的变化有重要影响;2009年秋季云南区域大气低层的水汽持续偏少、高层辐合低层辐散的高低层流场配置是这次干旱产生的最直接原因;另外,持续偏西偏强的西太平洋副热带高压、弱冷空气和弱暖湿气流活动,以及北方冷空气与南方暖湿气流影响云南的不同步、夏季风环流的提前结束等都对这次干旱过程产生了重要的影响。 相似文献
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We have proposed in a previous study a non-stationary wind model to represent the typhoon record as a summation of a time-varying mean wind speed (TVM) and a stationary turbulence. This note further suggests a quantitative scheme, rather than the previous qualitative method, to find the best TVM for any given wind record. Trial TVMs are first extracted from the wind record by a data-processing technique named empirical mode decomposition. For each TVM, its corresponding turbulent component is computed by removing the TVM from the original wind record, and the degree of stationarity of the turbulence component is checked. The best TVM is taken as the one that leads to the maximum degree of stationarity. The degree of stationarity of turbulence is quantified by two indicators: ?? the ratio of horizontal wind variability and wind speed; and ?? the ratio of friction velocity at different Reynolds averaging periods. The applicability of the suggested scheme is validated with 550 typhoon and 3300 monsoon records of 10 minute duration and at different measurement heights. Threshold values for the two stationary indicators ?? and ?? are determined using field measurements and their sensitivities to the Reynolds averaging periods are discussed. Observations in this study demonstrate that the suggested scheme is proper for finding the TVM of a wind record. For a stationarity quantification of 10 minute duration record, the ?? indicator with 30 second Reynolds averaging period is recommended. 相似文献