简介：BasedonChina’sobservationaldatain1951-1990,afterminimizingthepossiblebiasescausedbystationrelocationandurbanheatisland,thespatialandtemporaldistributionsoftrendsformaximumandminimumtemperaturesarestudied.Theresultsshowthatincreasingtrendsofmaximumtemperaturesareintheareaswestto95°E,andnorthtotheHuanghe(Yellow)River,whiledecreasingtrendsexistineasternChinasouthtotheYellowRiver.MinimumtemperaturesaregenerallyincreasingthroughoutChina,withdominantwarmingtrendsatthehigherlatitudes.Thisresultedinveryobviousdecreasingtrendsindiurnaltemperatureranges.Theperiodiccyclesareconsistentbetweenthemaximumandminimumtemperatures,butasymmetrictrendsareveryobvious.Thesignificantincreaseofminimum(nighttime)temperaturesreflectstheevidenceofenhancementofgreenhouseeffect.Furtheranalysisshowsthatthechangesofmaximumandminimumtemperaturesaremainlyrelatedtosunshinedurationandatmosphericwatervaporcontent.

简介：介绍了基于B／S结构的网上考试系统应用于气象部门的理论研究，并分析了系统总体结构，提供了一种应用SQL数据库以及ASP编程实现的网络考试系统，详细阐述了科目管理、随机生成试卷等模块的设计与实现，以及相关数据库表的结构。

简介：Thesimplelinearrelationshipbetweenclear-skyplanetaryandsurfacealbedocanbeadoptedforcertainaccuracy.Therearedifferentparameterizationschemesofatmosphericcorrectionfordifferentretrievalmodels.Inthispaper,severalrepresentativeretrievalmodelsarecomparedandtestedwithobservationaldatafromHEIhebasinFieldExperiment(HEIFE)inwesternChina.Someevaluationsandsuggestionsonimprovementareproposedformodelswhichwouldbemoreapplicabletoplateauandaridareas.

简介：Itispresentedthatthereisapumpingeffectatitsbaseinthedevelopmentprocessofacumulus.Inthestrongeststageofcumulusdevelopment,thepumpingismainlyproducedbythebuoyanceatthebase,andmaybetakenasthefirstapproximationoftheascendingspeedatthebase.Theresultsofnumericalcalculationsandsimulationsoffourobservedradarechoesshowthatasthefirstapproximation,theheightofair-masscumulusmaybesimulatedbyHaltinermodelintheabsenceofob-servedascendingspeedsatthebase,andtheHaltinermodelcanbecharacterizedbythesensitivityofthecumulusdevelopmenttothevirtualtemperatureexcessoverenvironmentatthebase.

简介：ThedistributionofmonthlymeanerrorofNMCmodelforecastsanditsseasonalvariationareinvesti-gated.Theratioofmonthlymeanerrortostandarddeviationisusedheretofindoutthattheregionwhereacorrectionofsystematicerrorisneededandappropriateismainlyinlowlatitudes.Theimprovement,afterthemodel’sverticalresolutionandsomephysicalparameterswerechangedfromApril1985,isinvestigated,andtheNMCoperationalmodelforecastshavealsocomparedwiththoseofECMWF.

简介：引言当前我国正积极筹备加入世界贸易组织(WTO),一旦加入,中国的一些农产品将受到国外农产品的严重冲击.在这种形势下,除了依靠政府制定有利于产业结构调整,稳定农民收入的政策外,生产者还应更加注重资源的合理利用,达到生态、经济、社会和生产的可持续发展.

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简介：以应用为切人点，介绍用VB开发基于SQLSERVER的C／S软件中的系统配置、前后台连接、数据访问等实际问题的解决思路及实例。对数据库控件、数据库访问对象及ODBC三种数据库访问方法进行比较分析，得出在气象业务C／S应用系统开发中，ADO数据访问方法是一种较佳的选择。

简介：Inthepaperthe5°×10°latitude-longitudegridpointdataofdaily500hPageopotentialheightovertheNorthernHemisphere(NH)insummer(June—August)during1980sareused.Thebasepoint(20°N,120°E)isselectedtocalcu-latepointcorrelationbetweenthebasepointandothergridpoints.WefindthatthesummerheatsourceanomalyofthetropicalwesternPacificcausesanomalyofsummergeneralcirculationoverNHandteleconnectionofgeneralcircula-tionsimilartoPNApatternformsfromEastAsiatoNorthAmerica.Theteleconnectionsshowgreatinterannualchanges.

简介：何金海，周学鸣，叶荣生ＮｕｍｅｒｉｃａｌＳｔｕｄｙｏｆＵｒａｌＢｌｏｃｋｉｎｇＨｉｇｈ＇ｓＥｆｆｅｃｔＵｐｏｎＡｓｉａｎＳｕｍｍｅｒＭｏｎｓｏｏｎＣｉｒｃｕｌａｔｉｏｎａｎｄＥａｓｔＣｈｉｎａＦｌｏｏｄａｎｄＤｒｏｕｇｈｔ￥ＨｅＪｉｎｈａｉａｎｄＺｈ...

简介：本文分析了杭州市1961～1986年早稻的光能利用率,并进一步分析和讨论了光能利用率与早稻生育期中不同时段的直射散射比(S/D)的关系。一、早稻的光能利用率及其提高趋势