全文获取类型
收费全文 | 2263篇 |
免费 | 750篇 |
国内免费 | 1491篇 |
专业分类
测绘学 | 25篇 |
大气科学 | 2312篇 |
地球物理 | 342篇 |
地质学 | 718篇 |
海洋学 | 677篇 |
天文学 | 25篇 |
综合类 | 142篇 |
自然地理 | 263篇 |
出版年
2024年 | 27篇 |
2023年 | 40篇 |
2022年 | 69篇 |
2021年 | 98篇 |
2020年 | 108篇 |
2019年 | 137篇 |
2018年 | 118篇 |
2017年 | 138篇 |
2016年 | 137篇 |
2015年 | 152篇 |
2014年 | 179篇 |
2013年 | 231篇 |
2012年 | 192篇 |
2011年 | 183篇 |
2010年 | 166篇 |
2009年 | 230篇 |
2008年 | 213篇 |
2007年 | 225篇 |
2006年 | 193篇 |
2005年 | 208篇 |
2004年 | 199篇 |
2003年 | 150篇 |
2002年 | 154篇 |
2001年 | 133篇 |
2000年 | 123篇 |
1999年 | 91篇 |
1998年 | 102篇 |
1997年 | 99篇 |
1996年 | 77篇 |
1995年 | 63篇 |
1994年 | 65篇 |
1993年 | 49篇 |
1992年 | 32篇 |
1991年 | 38篇 |
1990年 | 12篇 |
1989年 | 11篇 |
1988年 | 10篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1985年 | 8篇 |
1984年 | 9篇 |
1983年 | 6篇 |
1982年 | 4篇 |
1981年 | 11篇 |
1980年 | 2篇 |
1977年 | 5篇 |
排序方式: 共有4504条查询结果,搜索用时 31 毫秒
991.
A zonal-average model of the upper branch of the meridional overturning circulation of the southern ocean is constructed and used to discuss the processes – wind, buoyancy, eddy forcing and boundary conditions – that control its strength and sense of circulation. The geometry of the thermocline ‘wedge’, set by the mapping between the vertical spacing of buoyancy surfaces (the stratification) on the equatorial flank of the Antarctic Circumpolar Current and their outcrop at the sea surface, is seen to play a central role by setting the interior large-scale potential vorticity distribution. It is shown that the action of eddies mixing this potential vorticity field induces a residual flow in the meridional plane much as is observed, with upwelling of fluid around Antarctica, northward surface flow and subduction to form intermediate water. Along with this overturning circulation there is a concomitant air-sea buoyancy flux directed in to the ocean. 相似文献
992.
Numerical experiments were performed in order to investigate the effects of variations of the transport through the Korea/Tsushima Strait, an inlet of the Japan/East Sea, on the upper layer circulation in the JES based on a 10-month transport observation from May 1999 to March 2000 (Perkins et al., 2000). All external forcings to the model were annual mean fields, except the transport variation through the Korea Strait. In the experiments where the periodic variation of the transport repeated continuously sinusoidally by several periods, strong variability of sea surface height (SSH) was detected in the region extending from the Korea Strait to the Japanese coast due to the geostrophy of the buoyancy forcing at the Korea Strait. The region along the Korean coast is more sensitive to the long-term variations than the short-term (≤60-day period) ones. In two experiments forced by realistic and monthly mean transport, the difference of rms of sea surface height was largest at the Japanese coast and relatively large at the East Korean Warm Current separation region (128∼130°E, 39∼41°N) and to the east of Yamato Rise. The distribution of difference of eddy kinetic energy at 100 m depth between the two experiments was similar to that of the rms of SSH. In the distributions of mean SSH and mean kinetic energy at 100 m depth the realistic transport invokes eddy variability to interact with mean current resulting in the changes of the mean SSH and the mean kinetic energy at the East Korean Warm Current separation region, but it does not produce conspicuous changes in the mean fields of entire JES compared with the mean fields forced by the seasonal transport. 相似文献
993.
渤海冬季三维环流数值模拟 总被引:1,自引:2,他引:1
基于冯士笮所给出的一种浅海环流模型,采用数值方法,对渤海冬季进行环流的数值模拟,给出了冬季三维风生环流和正压环流(含潮余流)。分析了潮致Lagrange余流对冬季环流的贡献及黄海暖流余脉对渤海冬季环流的影响。最后对风生环流和正压环流的特征进行了分析和讨论。 相似文献
994.
995.
The tidal regime of Shark Bay, Western Australia 总被引:1,自引:0,他引:1
Murray C. Burling Charitha B. Pattiaratchi Gregory N. Ivey 《Estuarine, Coastal and Shelf Science》2003,57(5-6):725-735
A non-linear hydrodynamic model is used to describe the tidal dynamics of Shark Bay, Western Australia. The model is forced by tidal elevations generated by M2, S2, K1 and O1 constituent data at the open boundaries. The absence of suitable boundary data required a ‘calibration’ of the boundary condition against the known constituent data from within the model domain. The model provides a good match to the available field data, and allows the surface-level and current response to be resolved over the entire domain. Due to a near quarter-wave resonance of the semi-diurnal tide along the eastern Hopeless Reach, which increases the semi-diurnal tide by a factor of 2, the tidal characteristics on each of the Reaches are different: on the eastern Hopeless Reach the tides are mainly semi-diurnal while on the western Freycinet Reach the tides are mainly diurnal. The tidal range is also higher along Hopeless Reach. Tidal harmonics, generated by non-linearity, are important in the shallow regions. The tidal wave is shown to propagate as a progressive wave into the Bay. Substantial phase-lag, attenuation and dissipation occur over the Faure Sill, a major shallow region of the eastern reach of the Bay. Non-linear generation of the M4 and MS4 tides is also significant in this region. Depth-averaged residual currents are presented, which show a tidally generated circulation that is enhanced in regions of complex topography. Estimates of tidal dissipation indicate that although the total dissipation is small on a global scale, the areal average is comparable with the Gulf of Carpentaria and approximately one-quarter of the value estimated for the Patagonian Shelf. 相似文献
996.
研究南海环流的方法很多,采用GDEM资料,运用P矢量方法,得出了南海春季、夏季局部的上层流场分布情况.通过分析并结合UCM-60超声海流计和ADCP走航式测流仪相关实测数据,初步验证了这种研究南海上层季节环流所用的数值计算方法. 相似文献
997.
1998年夏季季风爆发前后南海环流的多涡特征 总被引:10,自引:0,他引:10
利用南海季风实验(SCSMEX-IOP1、IOP2)期间(1998年4月底-7月初)所获得的温盐深(CTD)、声学多普勒流速剖面仪(ADCP)资料及TOPEX/POSEIDON卫星高度计遥感资料,分析了南海表层、1.0MPa层和3.0MPa层得力势异常场的分布格局,探讨了夏季季风爆发前后南海的环流特征。结果表明:在夏季季风爆发前(IOP1期间)南海北部以气旋试流动为主,并在此气旋式环流的东部镶嵌着一个较小的反气旋型涡;南海中部和南部以反气旋式流动为主,其中越南以东海域存在着两个南北对峙分布的反气旋型涡,在它们的东侧伴随一气旋型涡。季风爆发后(IPO2期间),南海北部仍然以气旋式流动为主,黑潮水越过巴士海峡南北中线,一部分可能入侵南海北部,另一部分向东北折回黑潮主干;南海中部和南部仍以反气旋式流动为主,越南以东海域北部的反气旋型涡消失,但南西的反气旋型涡加强,与IOP1类似,仍伴随着一个气旋型涡。总体而方,强流区出现在巴士海峡西北侧和南海西部(尤其是越东南东沿岸),南海东部和东南部为弱流区。 相似文献
998.
福建初夏(7月)旱涝特征的对比分析 总被引:2,自引:2,他引:2
以全省25个代表站1960~2000年7月的降水资料和北半球500hPa高度资料、北太平洋海温的月平均资料为素材,首先标定典型旱涝年例,其次揭示降水的演变规律,最后对比分析典型旱涝年例的500hPa环流背景和海温特征,得出以下几点初步结论:1)福建初夏发生干旱年例和洪涝年例各约“十年二遇”;2)2a、5~7a、19a和9a的周期振动较为明显;3)北半球极涡偏弱(强),乌拉尔山附近的阻塞形势较为明显(不够明显),冷空气路径比较偏东(西),西太平洋副高偏强(弱)偏南(北),东亚中纬度高度场偏低(高),太平洋中部槽加深(槽较浅),东亚地区高、中、低纬的距平为“ - ”(“— —”)分布特征,在这环流形势的配置下,为福建初夏发生干旱(洪涝)提供有利的环流背景;4)黑潮区海温偏高(偏低),而太平洋中东部赤道附近海域海温儡低(偏高)时,福建初夏易于发生干旱(洪涝)。 相似文献
999.
INTRODUCTIONRecentyears’studyhasprimarilyshownthattheSCShasanimportantinfluenceonthemonsooncurrentsandonthefloodactivitiesoccurredintheregionofChina (Sunetal .,1 999,Dingetal.,1 999) .ThemonsoononsetinevitablycausestheadjustmentoftheSCScircula tion ,andinturn ,th… 相似文献
1000.