全文获取类型
收费全文 | 1778篇 |
免费 | 362篇 |
国内免费 | 590篇 |
专业分类
测绘学 | 73篇 |
大气科学 | 523篇 |
地球物理 | 439篇 |
地质学 | 996篇 |
海洋学 | 229篇 |
天文学 | 43篇 |
综合类 | 183篇 |
自然地理 | 244篇 |
出版年
2024年 | 4篇 |
2023年 | 29篇 |
2022年 | 74篇 |
2021年 | 96篇 |
2020年 | 60篇 |
2019年 | 80篇 |
2018年 | 87篇 |
2017年 | 85篇 |
2016年 | 99篇 |
2015年 | 83篇 |
2014年 | 115篇 |
2013年 | 91篇 |
2012年 | 91篇 |
2011年 | 82篇 |
2010年 | 85篇 |
2009年 | 97篇 |
2008年 | 89篇 |
2007年 | 78篇 |
2006年 | 47篇 |
2005年 | 61篇 |
2004年 | 60篇 |
2003年 | 77篇 |
2002年 | 61篇 |
2001年 | 66篇 |
2000年 | 77篇 |
1999年 | 123篇 |
1998年 | 113篇 |
1997年 | 95篇 |
1996年 | 80篇 |
1995年 | 85篇 |
1994年 | 74篇 |
1993年 | 60篇 |
1992年 | 52篇 |
1991年 | 38篇 |
1990年 | 34篇 |
1989年 | 22篇 |
1988年 | 11篇 |
1987年 | 12篇 |
1986年 | 16篇 |
1985年 | 8篇 |
1984年 | 3篇 |
1983年 | 7篇 |
1982年 | 7篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1979年 | 1篇 |
1978年 | 5篇 |
1977年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有2730条查询结果,搜索用时 359 毫秒
991.
Aerosol optical depth (AOD) is a common indicator applied in monitoring aerosols in the atmosphere. The hilly landscape and rapid economic growth of the megacity Chongqing have facilitated increased aerosol concentration, and it is meaningful to accurately retrieve AOD over Chongqing. The HJ-1A/B satellite of China carries a sensor/camera called the Charge Coupled Device (CCD), the spatial resolution of which meets the requirement for retrieving high resolution AOD. In this paper, analysis of the AOD retrievals from different methods using the HJ-1 satellite data revealed the most suitable algorithm. Through comparison with the AOD product of Moderate Resolution Imaging Spectroradiometer (MODIS), the AOD retrieval results using enhanced vegetation index (EVI) to estimate dark pixels showed the highest correlation. The continental aerosol model was used to build a lookup table that was able to facilitate a good AOD retrieval for both city and rural areas. Finally, the algorithm that combined dark pixels, buffer areas, and the deep blue algorithm was found to be most suitable for AOD retrieval. The AOD retrieval results based on the HJ-1 data were consistent with MODIS products, and our algorithm yields reasonable results in most cases. The results were also compared with ground-based PM10 measurements synchronized with the overpass time of the HJ-1 satellite, and high correlation was found. The findings are relevant to other Chinese satellite data used for retrieving AOD on the same channels. 相似文献
992.
根据2002年1月的温度场和大气污染浓度强化监测资料,分析成都市冬季逆温特征.成都市的冬季逆温主要为上部逆温,出现频率为62.9%;通过分析其上部逆温的时间和空间分布特征,认为成都市冬季逆温对大气污染扩散的不利影响,主要表现为03时上部逆温对≤75m的低矮源污染物扩散的影响,而对高架源污染物的扩散影响不大. 相似文献
993.
MCS(中尺度对流系统)是造成湖南暴雨等灾害性天气的主要影响系统,它与暴雨的落区、强度、持续时间密切相关。以2005年5月31至6月1日的湖南特大暴雨洪涝过程为例,利用中尺度数值模式MM5对MCS的雨量、动力热力特征、三维结构以及发展变化进行了模拟分析和研究,指出本次MCS发展的触发因子是近地层冷锋,维持机制是近地层不稳定能量的积蓄、中低层辐合和高层辐散的结构,大尺度系统是其发展或消亡的主导因素,并分析了水汽对暴雨强度和落区的影响,旨在为预报和防御同类灾害性天气提供参考依据。 相似文献
994.
为实现短时临近预警业务集约化智能化运行和管理,采用B/S结构模式及Web GIS技术开发了省、市、县三级一体化的短时临近天气预警集约化业务系统。该系统集天气监控、预报预警产品制作、服务分发和业务管理为一体,具有业务整体性强、集约化程度高、有一定智能化功能等特点。系统开发集成的主要关键技术包括突发天气短时临近预报概念模型的建立,预警产品的制作与订正,强对流天气区的自动识别和追踪技术等。目前该系统已投入业务运行,成为广西区、市、县三级短临监测、预报一体化平台,实现了各级台站之间气象信息的快速交流共享,达到上下级台站短时天气快速联防互动的效果,预警产品制作比旧的业务系统效率更高效,流程更规范,生成的产品内容更标准,上下级业务互动更快速。该系统推进了气象业务的集约化、智能化运行及维护,服务器布置于省局,客户端以网页方式推送、展示,用户通过浏览器就能完成天气监测及预报预警产品制作到发布的所有流程。 相似文献
995.
Gang Zeng Wei-Chyung Wang Caiming Shen Zhixin Hao 《Asia-Pacific Journal of Atmospheric Sciences》2014,50(3):355-364
We present a study of summer precipitation changes over the Yangtze River Valley (YRV) and North China (NC) simulated from 20 models of the CMIP3 (phase 3 of the Coupled Model Intercomparison Project). It is found that the LASG-FGOALS-g1.0 (fgoals) model has the highest ability in simulating both the interannual variability of individual regions and the seesaw pattern of the two regions observed during the past few decades. Analyses of atmospheric circulations indicate that the variability in precipitation is closely associated with the 850 hPa meridional winds over the two regions. Wetness in the YRV and dryness in NC are corresponding to strong meridional wind gradient and weak meridional wind over these two regions, respectively. The ability of a coupled general circulation model (CGCM) to simulate precipitation changes in the YRV and NC depends on how well the model reproduces both observed associations of precipitation with overlying meridional winds and observed meridional wind features in summer. Analysis of future precipitation changes over the two regions projected by the fgoals model under the IPCC scenarios B1 and A1B suggests a significant increase of 7–15% for NC after 2040s due to the strengthened meridional winds, and a slight increase over the YRV due to less significant intensification of the Mei-yu front. 相似文献
996.
Simulations of the effects of soil temperature and humidity disturbances on regional climate of China 总被引:1,自引:0,他引:1
Zheng Yiqun Qian Yongfu Yu Ge Gui Qijun Zeng Xinmin Liu Huaqiang 《Meteorology and Atmospheric Physics》2002,81(1-2):85-102
Summary ?This simulation study was applied by a regional climate model (RegCM2) and forced by reasonable soil temperature and humidity
disturbances, in order to examine the disastrous weather and climate-produced such disturbances that were performed in a series
of experiments of different climatic zones, seasons and space/time scales, to recognize the persistence and to understand
the mechanisms of their respective climatic responses under the current climatic background of China.
The simulation results showed that, in regions of East Asian monsoon climate, the soil humidity disturbance (SHD) has greater
impact on posterior climate responses than the temperature disturbance has. The SHD forcing exerts noticeable influence on
rainfall generally. Although the centers of changed precipitation generally do not coincide with those of the disturbances,
the centers are located mostly in downwind areas of the SHD core and in areas of prevailing updraft, even some places far
away; with neighboring dry/moist SHD zones, a bigger rainfall increase tends to show up in the dry region instead of in the
wet one.
The simulation suggested that the SHD lasts for a rather long time, whose length is controlled by the presence of a positive
feedback between the precipitation, the synchronous circulation patterns, the latitude and season, and the intensity of the
SHD forcing.
This study has found that the humidity disturbance (especially from rainfall) is in good correspondence to posterior temperature
that the previous SHD enhancement leads to the subsequent temperature drop in the surface and near-surface layer, while the
centers of lowered temperature can remain more than three months.
Received April 3, 2001; Revised December 19, 2001 相似文献
997.
998.
利用1988~2000年7~9月南昌、建阳、长沙三站探空资料及同期地面和500 hPa天气图与降雨量资料等,对照1988~2000年7~9月南昌(建阳、长沙713雷达站部分资料)"713"雷达站回波素描图进行统计分析,得出南方夏季对流云回波的顶高、强度、性质等参数变化规律与主要特征,从宏观上了解影响南方夏季对流云回波参数等特征量的变化规律,为南方各省人工影响天气作业提供科学依据. 相似文献
999.
1000.
自适应网格在大气海洋问题中的初步应用 总被引:15,自引:4,他引:15
自适应网格法是80年代兴起的通过求解椭圆型方程的边值问题来数值生成网格的一种新方法。它是在任意形状的区域上求偏微分方程的数值解的一种非常有效的工具。该方法抛弃了等距均匀的差分网格,代之以能够自动地适应所研究问题中解的特征的疏密程度不均的曲线网格。如在边界上计算网格与实际边界相重合,在区域内部可任意调节网格点的疏密程度等。本文扼要地介绍了自适应网格的原理及其构造方法。并将其应用于生成南海区域的计算网格以及数值预报台风路径的自适应网格。 相似文献