Roles of Mesoscale Terrain and Latent Heat Release in Typhoon Precipitation： A Numerical Case Study     

李昀英  黄伟  赵焦枝 《大气科学进展》2007,24(1):35-43

The mesoscale orographic effects on typhoon Aere＇s precipitation are simulated using an Advanced Regional Eta-coordinate Model （AREM） version 3.0. In particular, the effects of the latent heat release are studied by two comparable experiments： with and without condensational heating. The results show that the typhoon rainfall is tripled by the southeastern China mesoscale terrain, and the condensational heating is responsible for at least half of the increase. One role of the latent heat release is to warm the atmosphere, leading to a depression of the surface pressure, which then causes a larger pressure difference in the zonal direction. This pressure gradient guides the water vapour to flow into the foothills, which in turn amplifies the water vapour flux divergence amplified, causing the typhoon rainfall to increase eventually. The other role of the latent heat release is to make the convection more organized, resulting in a relatively smaller rain area and stronger precipitation.  相似文献   

"龙王"(LONGWANG)台风过程湿位涡的诊断分析   总被引：8，自引：2，他引：8       下载免费PDF全文

赖绍钧  何芬  赵汝汀  沈桐立  吴启树 《气象科学》2007,27(3):266-271

本文应用MM5V3中尺度数值模式对0519号台风“龙王”过程进行了数值模拟,利用模拟结果计算了台风过程湿位涡(Moist Potential Vorticity,MPV)的演变,从湿位涡的角度研究了台风过程大暴雨的产生机制。结果表明:倾斜涡度发展是“龙王”台风在福建沿海产生大暴雨的重要机制之一,湿位涡能够对暴雨落区的预报有较强的指示性作用,暴雨产生在θse线陡立的对流层中低层MPV1等值线密集带中零线附近,对流层中高层的MPV2负值区可以作为暖湿气流或涡旋活动的示踪;另外,对流层中高层中高纬度冷空气扩散南下与台风的东南暖湿空气在福建沿海交汇,加剧了气旋性涡度发展,对暴雨的发生发展也有巨大的作用。  相似文献   

京津冀地热资源综合利用研究     

田勇  王卫民  赵岩 《中国煤炭地质》2020,(2):51-58

京津冀地区资源环境问题,需发挥地质工作基础先行作用—积极拓展清洁能源领域,在大气治理行动中发挥作用。京津冀地区地热资源丰富,地热资源主要为沉积盆地型地热资源,占总量的99%。沉积盆地型地热资源主要分布在新近系明化镇组、馆陶组,古近系东营组,寒武-奥陶系,元古界。对京津冀地下热水进行科学合理的开发,将资源优势转化为经济优势和生态优势,是我省乃至京津冀发展低碳经济、绿色经济的迫切需要,是实现节能减排目标的有效途径。  相似文献   

中国萤石产业资源现状及发展建议     

赵鹏  郑厚义  张新  王帆  王英林 《化工矿产地质》2020,42(2):178-183

萤石是中国重要的战略性矿产资源。本文通过分析萤石资源现状、供需格局、产业发展以及近年来萤石行业发展面临的新形势和特点,为保障中国萤石产业可持续发展提出加大勘查投入、提高资源保障程度、合理有效开发、促进产业升级等建议。  相似文献   

Climate extremes in Loess of China coupled with the strength of deep-water formation in the North Atlantic   总被引：1，自引：0，他引：1  

Zhengtang Guo  Tungsheng Liu  Nicolas Fedoroff  Lanying Wei  Zhongli Ding  Naiqin Wu  Huoyuan Lu  Wenying Jiang  Zhisheng An 《Global and Planetary Change》1998,18(3-4)

The loess-paleosol sequences of the last 1.2 Ma in China have recorded two kinds of climate extremes: the strongly developed S4, S5-1 and S5-3 soils (corresponding to the marine δ¹⁸O stages 11, 13, and 15, respectively) as evidence of three episodes of great warmth and two coarse-grained loess units (L9 and L15, corresponding to the marine δ¹⁸O stages 22, 23, 24 and 38, respectively) which indicate severest glacial conditions. The climatic and geographical significance of these events are still unclear, and their cause remains a puzzle.Paleopedological, geochemical and magnetic susceptibility data from three loess sections (Xifeng, Changwu and Weinan) suggest that the S4, S5-1 and S5-3 soils were formed under sub-tropical semi-humid climates with a tentatively estimated mean annual temperature (MAT) of at least 4–6°C higher and a mean annual precipitation (MAP) of 200–300 mm higher than for the present-day, indicating a much strengthened summer monsoon. The annual rainfall was particularly accentuated for the southern-most part of the Loess Plateau, suggesting that the monsoon rain belt (the contact of the monsoonal northward warm-humid air mass with the dry-cold southward one) might have stood at the southern part of the Plateau for a relatively long period each year. The loess units L9 and L15 were deposited under semi-desertic environments with a tentatively estimated MAT and MAP of only about 1.5–3°C and 150–250 mm, indicating a much strengthened winter monsoon, and that the summer monsoon front could rarely penetrate into the Loess Plateau region.Correlation with marine carbon isotope records suggests that these climate extremes have large regional, even global, significance rather than being local phenomena in China. They match the periods with greatest/smallest Atlantic–Pacific δ¹³C gradients, respectively, indicating their relationships with the strength of Deep Water (NADW) production in the North Atlantic. These results suggest that the monsoon climate in the Loess Plateau region was significantly linked with the North Atlantic thermohaline circulation on timescales of 10⁴ years.  相似文献   

Florogeography of mire plants in southern part of qinghai-xizang plateau and its adjacent areas     

赵魁义 《中国地理科学(英文版)》1998,8(1):44-52

ＦＬＯＲＯＧＥＯＧＲＡＰＨＹＯＦＭＩＲＥＰＬＡＮＴＳＩＮＳＯＵＴＨＥＲＮＰＡＲＴＯＦＱＩＮＧＨＡＩＸＩＺＡＮＧＰＬＡＴＥＡＵＡＮＤＩＴＳＡＤＪＡＣＥＮＴＡＲＥＡＳＺｈａｏＫｕｉｙｉ（赵魁义）ＣｈａｎｇｃｈｕｎＩｎｓｔｉｔｕｔｅｏｆＧｅｏｇｒａｐｈｙ...  相似文献   

WINDOWS下实时气象资料接收及运行状态监视系统     

袁东升  赵吉武 《成都信息工程学院学报》1998,(4)

气象资料接收的好坏,不可避免地影响到气象预报质量。该软件系统能实时动态监视气象资料的接收情况,及时获得资料的缺、迟、错等信息,及时补报,有利于提高资料的完整性及预报准确率。  相似文献   

湘东北—桂北中元古界岩石地球化学特征     

金文山  赵风清  王祖伟  甘晓春 《南方国土资源》1998,(1)

湘东北—桂北中元古代冷家溪群和四堡群的变玄武岩类显示过渡型拉斑玄武岩类的地球化学特征,变砂岩类和变泥岩类（绢云板岩类）显示大陆边缘的砂岩类和泥岩类的地球化学特征。根据岩石地球化学和沉积相（低密度流复理石建造）特征,推测湘东北冷家溪群和桂北四堡群主要形成于大陆边缘深水环境。  相似文献   

华机构造单元划分及其特征     

金文山  赵凤清  张惠民 《浙江国土资源》1998,(1)

华南（研究区）由杨子地块东南部和华夏地块组成。前者划分为三个次级构造单元;江南构造城,怀玉山—浙西北构造域,彭庐构造域;后者划分为二个次级构造单元;闽北—浙东南构造域,桂粤湘赣闽构造域。华夏地块相对于扬子地块是比较活动的构造单元。  相似文献   

激光法气相合成纳米Si/C/N复相粉体     

赵东林  潘正伟  周万城 《地球科学与环境学报》1998,20(4):20

用大功率５ｋＷＣＯ２激光器为能源,以六甲基二硅胺烷［（ＣＨ３）３Ｓｉ］２ＮＨ（简称ＨＭＤＳ）和ＮＨ３为原料,合成纳米非晶Ｓｉ／Ｃ／Ｎ复相粉体。研究了ＨＭＤＳ流量和ＮＨ３对纳米复相粉体组成的影响。ＮＨ３的加入可以大幅度降低纳米复相粉体的碳含量,提高氮含量。Ｓｉ／Ｃ／Ｎ纳米复相粉体的粒径分布范围为１０～５０ｎｍ,为非晶态。  相似文献