全文获取类型
收费全文 | 382篇 |
免费 | 188篇 |
国内免费 | 498篇 |
专业分类
测绘学 | 9篇 |
大气科学 | 773篇 |
地球物理 | 44篇 |
地质学 | 26篇 |
海洋学 | 177篇 |
天文学 | 2篇 |
综合类 | 18篇 |
自然地理 | 19篇 |
出版年
2024年 | 7篇 |
2023年 | 16篇 |
2022年 | 40篇 |
2021年 | 32篇 |
2020年 | 48篇 |
2019年 | 37篇 |
2018年 | 45篇 |
2017年 | 37篇 |
2016年 | 32篇 |
2015年 | 25篇 |
2014年 | 49篇 |
2013年 | 54篇 |
2012年 | 49篇 |
2011年 | 41篇 |
2010年 | 43篇 |
2009年 | 34篇 |
2008年 | 36篇 |
2007年 | 63篇 |
2006年 | 47篇 |
2005年 | 50篇 |
2004年 | 45篇 |
2003年 | 36篇 |
2002年 | 32篇 |
2001年 | 24篇 |
2000年 | 21篇 |
1999年 | 22篇 |
1998年 | 26篇 |
1997年 | 11篇 |
1996年 | 9篇 |
1995年 | 20篇 |
1994年 | 10篇 |
1993年 | 11篇 |
1992年 | 9篇 |
1991年 | 5篇 |
1987年 | 2篇 |
排序方式: 共有1068条查询结果,搜索用时 62 毫秒
41.
为研究暴雨过程中逆风区特征及应用判据,统计分析2010—2017年山东临沂地区暴雨过程中的多普勒雷达观测资料,结果表明:暴雨过程中,风暴内的垂直环流是造成逆风区发生发展的直接原因;逆风区表现为β中尺度和γ中尺度,其形态在不同天气类型下有明显差异;逆风区持续阶段降水强度增大,持续时间与过程累积雨量呈正相关;当雷达最低仰角识别到逆风区,其厚度≥4.0 km、强度≥15 m·s-1、径向速度绝对值最大值≥5 m·s-1且持续30 min以上时,风暴常明显发展,相关特征可用于预报风暴和暴雨的发展。 相似文献
42.
Sustainable water resources management require scientifically sound information on precipitation, as it plays a key role in hydrological responses in a catchment. In recent years, mesoscale weather models in conjunction with hydrological models have gained great attention as they can provide high‐resolution downscaled weather variables. Many cumulus parameterization schemes (CPSs) have been developed and incorporated into three‐dimensional Pennsylvania State University/National Center for Atmospheric Research (PSU/NCAR) mesoscale model 5 (MM5). This study has performed a comprehensive evaluation of four CPSs (the Anthes–Kuo, Grell, Betts–Miller and Kain–Fritsch93 schemes) to identify how their inclusion influences the mesoscale model's precipitation estimation capabilities. The study has also compared these four CPSs in terms of variability in rainfall estimation at various horizontal and vertical levels. For this purpose, the MM5 was nested down to resolution of 81 km for Domain 1 (domain span 21 × 81 km) and 3 km for Domain 4 (domain span 16 × 3 km), respectively, with vertical resolutions at 23, 40 and 53 vertical levels. The study was carried out at the Brue catchment in Southwest England using both the ERA‐40 reanalysis data and the land‐based observation data. The performances of four CPs were evaluated in terms of their ability to simulate the amount of cumulative rainfall in 4 months in 1995 representing the four seasonal months, namely, January (winter), March (spring), July (summer) and October (autumn). It is observed that the Anthes–Kuo scheme has produced inferior precipitation values during spring and autumn seasons while simulations during winter and summer were consistently good. The Betts–Miller scheme has produced some reasonable results, particularly at the small‐scale domain (3 km grid size) during winter and summer. The KF2 scheme was the best scheme for the larger‐scale (81 km grid size) domain during winter season at both 23 and 53 vertical levels. This scheme tended to underestimate rainfall for other seasons including the small‐scale domain (3 km grid size) in the mesoscale. The Grell scheme was the best scheme in simulating rainfall rates, and was found to be superior to other three schemes with consistently better results in all four seasons and in different domain scales. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
43.
44.
利用高空资料、地面资料和红外卫星云图资料,对发生在浙江中北部的9012台风倒槽暴雨的机制进行分析,揭示了该台风倒槽的结构和暴雨的环境场。并进一步研究了产生暴雨的中尺度暴雨云团及其周围的垂直气流分布与地面降水的对应关系。对暴雨云团所对应的高、中、低(地面)层系统亦进行了分析。 相似文献
45.
徐文金 《南京气象学院学报》1995,18(2):242-247
分析了8807号台风所引发的局地特大暴雨成因:(1)台风提供了足够的水汽;(2)台风螺旋状云雨区和太阳辐射不均匀,形成了低层中尺度锋区,为暴雨发生提供极不稳定能量和触发条件;(3)局地地形和摩擦因子使湖北省宜昌地区成为这次对流云发展较有利的地点;(4)高空的中尺度降压系统和涡度因子加强了对流云团的发展。 相似文献
46.
A case of mesoscale convective complex(MCC)which evolved into a vortex is documented in this paper.As theMCC entered into the dissipating phase,a well-defined spirally banded structure became visible in the satellite image.The blackbody temperature(TBB)of the residual cold-cloud-shield indicates the vortex existed in the layer from 400 to250 hPa.According to the upper air analysis,the upper level vortex was an anticyclone.The MCC-generated vortex wasvisualized in the satellite images because it was located in the subtropical high where the wind field was very weak. 相似文献
47.
使用气象卫星资料,分析了1989年7月发生在四川东部的4个中尺度对流系统的特征,第一个系统是由3个对流云团合并而成,生成后快速向前移动,第二个为向后传播。第三个系统生成后,系统的西南部不断生成新的对流单体,使之维持准静止状态,最后一个系统的初期呈胞状结构,后与冷锋结合,成为冷锋云系的一部分,这4个系统都是西南低涡暖切变形势下的产物,随着形势演变,其大尺度环境略有差异。 相似文献
48.
东北地区中尺度对流复合体的卫星云图特征 总被引:5,自引:0,他引:5
通过10年(1983-1992年)卫星云图资料的分析,综合归纳了东北地区中尺度对流复合体(NMCC)的基本特征及其发展演变过程,由于受地理条件的影响,NMCC与美国大平原以及我国西北和华北平原上的MCC有明显差别,作为一类特殊的对流性天气系统,NMCC与一般中尺度对流云图特征有明显差异。 相似文献
49.
50.
Tao Zuyu Wang Hongqing Bai Jie Zhu Wenqin Shi Dingpu Yang Hongmei 《Acta Meteorologica Sinica》1995,9(2):184-189
A case of mesoscale convective complex(MCC) which evolved into a vortex is documented in this paper.As the MCC entered into the dissipating phase,a well-defined spirally banded structure became visible in the satellite image.The blackbody temperature(TBB) of the residual cold-cloud-shield indicates the vortex existed in the layer from 400 to 250 hPa.According to the upper air analysis,the upper level vortex was an anticyclone.The MCC-generated vortex was visualized in the satellite images because it was located in the subtropical high where the wind field was very weak. 相似文献