共查询到20条相似文献,搜索用时 531 毫秒
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一、前言无论科学技术怎样进步,作为生物的人类离开生物体(biomass)资源就不能生存。然而,现在人类的生产活动以全球规模大量开展使地球环境发生变化,到处引起环境破坏和生态系统破坏,这一趋势可能有增无减。 相似文献
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儿时的回忆是温馨的,美好的。 我开始记事是在3年困难时期。当我狼吞虎咽地吃完属于自己的那一小筒米饭,环顾左右,寻找别人饭筒上的饭粒时,母亲往往把自己的那一份分给我们,而她自己却在背地里吃糠咽菜。 相似文献
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《沙漠与绿洲气象(新疆气象)》2006,29(2):29-29
“气象港”是新疆气象学会2005年创办的非赢利、面向公众的科学技术网站。传播科学知识,开展学术交流,推进科学创新,探讨热门话题、活跃气象文化活动。气象港的宗旨是为广大科技工作者服务。气象港设有21个栏目,分别为:实时新闻(快讯)、学术交流(讲座、论文、科技文章、理念、专题)、气象科普(公众气象、一句话气象)、气象文化(图书、人物、图片)、学会工作管理(学会之窗、法规)、公众参与(问题)等。以信息实效,内容丰富,知识新颖,专业性强而服务于大众。气象港网址:http//qxg.com.cn科学知识的港湾 学术交流的平台… 相似文献
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董惠萍 《沙漠与绿洲气象(新疆气象)》1989,(12)
在气候学家能够说明大气中的温室气体是否的确开始使地球表面增暖之前,也许已过了十年或几十年.但是科学团体并没有只坐在温度表前,等待升温的发生.美国一些科研机构的领导人去年12月指出:“我们相信,全球环境变化将会是下一世纪最为迫切的国际问题”. 相似文献
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1991年9月2日,在人民大会堂,我参加了"七五"国家重点科技攻关总结表彰大会.党和国家领导人江泽民总书记和李鹏总理等出席了大会.大会由国家计委、科委和财政部共同召开,国务委员兼财政部长王丙乾主持会议.国务委员兼国家科委主任宋健宣读了国家计委、国家科委、财政部对国家"七五"科技攻关重大科技成果及其先进集体、先进个人颁奖的决定.会上,由李鹏总理作了重要讲话. 相似文献
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世界气象组织农业气象委员会编写的第118号技术文集(WMO Technical NoteNo.118),搜集对于不利于植物的天气的防护方面的各种方法和现代文献并作出评价(不包括人工气候室)。对从事农业气象工作者可能有参考意义。 相似文献
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A SIMULATION STUDY OF THE INFLUENCE OF LAND FRICTION ON LANDFALL TROPICAL CYCLONE TRACK AND INTENSITY 总被引:1,自引:0,他引:1
A quasi-geostrophic barotropic vorticity equation model is used to simulate the influences of topographic forcing and land friction on landfall tropical cyclone track and intensity. The simulation results show that tropical cyclone track may have sudden deflection when the action of topographic friction dissipation is considered, and sudden deflection of the track is easy to happen and sudden change of tropical cyclone intensity is not clear when the intensity of tropical cyclone is weak and the land friction is strong.The land friction may be an important factor that causes sudden deflection of tropical cyclone track around landfall. 相似文献
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能量频散对台风结构和移动的作用 总被引:10,自引:10,他引:10
本文用双Fourier展开的解析方法和β平面准地转正压模式数值试验的方法,研究了台风涡旋能量频散及其对台风路径的影响问题。解析与数值试验的结果一致地表明,由于能量频散,在台风中心以东方向形成了一个低-高-低值系统的波列。三组数值试验的结果表明,波列中的高值系统对台风的结构和移行具有明显的影响。 相似文献
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钟元 《热带气象学报(英文版)》2002,8(2):207-217
An objective analogue prediction model for tropical cyclone (TC) track is put forward that
comprehensively assesses the environmental field. With the parameters of the tropical cyclone and environmental
field at initial and future time, objective analogue criteria are set up in the model. Analogous samples are
recognized by comprehensive assessment to historical TC cases for similarity with multivariate criteria,using
non-linear analogue indexes especially defined for the purpose. When the historical tracks are
coordinateconverted and weighted with reference to analogue indexes,forecast tracks are determined. As shown
in model verification and forecast experiments, the model has forecasting skill. 相似文献
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2002年西北太平洋和南海热带气旋路径主客观预报评价 总被引:3,自引:2,他引:1
利用目前中央气象台热带气旋路径实时业务预报中使用的各种主客观预报产品资料,对2002年西北太平洋和南海热带气旋路径实时业务预报中的主客观预报进行对比分析检验。结果显示:虽然在整体上主观预报要优于客观模式的结果,但客观模式的预报能力已接近主观预报,有时甚至还好于主观预报,特别是48小时以上时效的客观模式较主观预报具有一定的优势;而在客观模式中,全球模式优于台风模式;热带气旋路径数值模式产品的使用对提高热带气旋路径业务预报水平具有十分重要的作用。 相似文献
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In the context of a model of tropical cyclone intensity based on an improved meso-scale atmospheric model, numerical simulation is performed of the track and intensity variation of tropical cyclones(TC) arising from sea surface temperature(SST) variation over a specified sea region. Evidence suggests that the model is capable of modeling quite welt the track and intensity of TC:SST variation leads to an abrupt change in the cyclone intensity:the response of the cyclone to the abrupt SST change lasts 8-12 h. 相似文献
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Russell L. Elsberry 《Asia-Pacific Journal of Atmospheric Sciences》2010,46(2):217-220
Tropical cyclone track forecasts have been improved, and forecast intervals have been extended to five days, owing to improved global and regional numerical model guidance. Critical time requirements that must be met for operational use of the deterministic model track forecasts are summarized for the U.S. and other selected non-U.S. tropical cyclone warning centers. One of the most accurate deterministic model forecasts from the European Center for Medium-range Weather Forecasts arrives too late to be used with other models at the + 6 h warning time, and thus is at least 12 h old before it can be operationally used. The time-critical nature of the tropical cyclone warning system is a major obstacle to operational use of single-model, or proposed multi-model, ensemble prediction system (EPS) mean and spread information, which is 12 h (or 18 h) delayed. This EPS mean and spread must also be superior to the mean and spread of the consensus of deterministic models that are available six hours earlier. These requirements must be met before the EPS tropical cyclone tracks will be operationally useful in specifying the uncertainty in the official track forecasts, which is the next challenge in tropical cyclone track warnings. 相似文献