Characteristics and Changes of Cold Surge Events over China during 1960-2007

This paper demonstrates regional characteristics, a long-term decreasing trend, and decadal variations in the frequency of cold surge events based on daily mean temperature and daily minimum temperature data in mainland China from 1960 to 2008. During these 48 years, four high frequency centers of cold surge events were located in Xinjiang, central North China, northeast China, and southeast China. A main frequency peak of cold surge events occurs in autumn for the four regions and another peak is detected in spring over northeast China and southeast China. The regional pattern of cold surge frequencies is in accordance with the perturbation kinetic energy distribution in October-December, January, and February-April. The long-term decreasing trend （-0.2 times/decade） of cold surge frequencies in northeast China and decadal variations in China are related to the variations of the temperature difference between southern and northern China in the winter monsoon season; these variations are due to the significant rising of winter temperatures in high latitudes.     

Simulation and Analysis of China Climate Using Two-Way Interactive Atmosphere-Vegetation Model （RIEMS-AVIM）

In this paper, an Atmosphere-Vegetation Interaction Model （AVIM） is coupled to the Regional Integrated Environment Model System （RIEMS）, and a 10-year integration for China is performed using the RIEMS-AVIM. The analysis of the results of the 10-year integration shows that the characters of the spatial distributions of temperature and precipitation over China are well simulated. The patterns of simulated surface sensible and latent heat fluxes match well with the spatial climatological atlas： the values of winter surface sensible and latent heat fluxes are both lower than climatological values over the whole country. Summer surface sensible heat flux is higher than climatological values in western China and lower in eastern China, while summer surface latent heat flux is higher than climatological values in the eastern and lower in the western. Seasonal variations of simulated temperature and precipitation of RIMES-AVIM agree with those of the observed. Simulated temperature is lower than the observed in the Tibetan Plateau and Northwest China for the whole year, slightly lower in the remaining regions in winter, but consistent with the observed in summer. The simulated temperature of RIEMS-AVIM is higher in winter and lower in summer than that of RIEMS, which shows that the simulated temperature of RIEMS-AVIM is closer to the observed value. Simulated precipitation is excessive in the first half of the year, but consistent with the observed in the second half of the year. The simulated summer precipitation of RIEMS-AVIM has significant improvement compared to that of RIEMS, which is less and closer to the observed value. The interannual variations of temperature and precipitation are also fairly well simulated, with temperature simulation being superior to precipitation simulation. The interannual variation of simulated temperature is significantly correlated with the observed in Northeast China, the Transition Region, South China, and the Tibetan Plateau, but the correlation between precipitation simu     

山东省气象科技服务开展情况及未来发展思路建议

介绍了山东省气象科技服务发展的情况、产品研发平台和具有地方特色的几个产品,介绍了2008年山东省气象科技服务在金融危机下受到的影响,并对气象科技服务未来的发展提出了相关建议和思路。     

重力波与低纬高原地区Mβ CSs地域特征的关系

利用MM5（V3.6）模式对2003年6月低纬高原地区一次大暴雨过程进行了数值模拟和地形敏感性试验,从重力波的角度研究低纬高原地区MβCSs生命史较短这一地域特征形成的原因。分析表明,大气稳定层结利于重力波的产生和传播,重力波的传播导致MβCSs的能量向两侧快速频散,使得成熟的MβCSs主体强度减弱,两侧有新的MβCSs生成并发展,中心降水也迅速减弱。地形敏感性试验表明,低纬高原地形使得大气在不稳定能量积累以后很快释放触发强降水,大气随即转化为稳定层结,利于重力波的快速传播和MβCSs主体能量的迅速频散,使得低纬高原地区触发暴雨的MβCSs生命史较短,引发的降水具有突发性强、历时短的特征。     

楚河汉街的“楚”味

如果说白云悠悠的黄鹤楼是荆楚大地的旅游坐标,那么楚河汉街,就是展示荆楚文化的一张明信片。仅从字面上看,楚河汉街就具有浓郁的地域特色了。前段时间,我兴致盎然地游览了楚河汉街。     

我国大陆干旱指数及其年际变化

本文应用正交旋转主分量分析方法,计算分析了我国大陆1952—1987年间大气干旱指数s=ΔT/σ_T-ΔR/σ_R的地域相关和年际变化特征。结果表明,可以将我国大陆上旱涝异常的变化大致按43°N和30°N为分界线划分成三个基本相关的纬带。1954—1957年间和1963、1969年前后大部分地区相对湿润多雨。70年代以来,长江以北相对少雨干旱,气候变化的大趋势与撒亥勒(Sahel),以及英格兰中部和威尔士等地区相类似。年度干旱指数年际变化的短周期大部分地区以2—3年为主,具有准两年振荡的特点。     

气候变化对我国冬季取暖的影响研究

气候变化对能源系统（能源开发、输送、供应等）有着广泛的影响。而能源的需求是随着气候变化,特别是温度变化而变化的。我国气候条件地域差异明显,年内、年际变率大。鉴于我国冬季取暖的特点等方面的原因,在研究气候的变化时首先考虑温度变化这一主要的要素,因为冬季取暖能耗主要取决于受温度变化影响的取暖度日和取暖长度。通过对这些要素的分析,来建立温度变化对北方地区取暖的影响模型。     

让气象科技服务成为新农村建设的好参谋

1新农村建设对气象服务有着强烈的渴望和迫切的需求 1．1新农村建设对气象科技服务的迫切需求． 1．1．1农村经济发展迫切需求气象服务农村经济的发展很大程度上依赖于粮食生产安全和特色农业,自然灾害是首要影响因子,     

以祁连山问题整改为抓手 深入推进法治国土建设

党的十八大以来,以习近平同志为核心的党中央从坚持和发展中国特色社会主义全局出发,提出并形成了全面建成小康社会、全面深化改革、全面依法治国、全面从严治党的战略布局。全面依法治国对协调推进“四个全面”战略布局具有基础性、保障性作用。习近平总书记强调,     

谈如何开创地方地图出版社的特色

俗话说：山不在高,有仙则名;水不在深,有龙则灵。一个地方出版社,只有掌握了特色这条龙脉,才能充满生机,走向繁荣。处于世纪之交的中国出版业面临着严峻的挑战,作为省一级的地图专业出版社如何在激烈的市场竞争中占有一席之地,是我们必须认真对待的问题。立足地图...