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761.
重庆市冬季雾的物理化学特性 总被引:32,自引:8,他引:32
在1989年12月15日至1990年1月15日和1990年12月7日至1991年1月7日,对重庆市区冬季雾进行了综合观测试验。从多项观测资料综合分析了雾的物理化学结构,揭示了重庆市区冬季雾许多重要的有别于外地的特征。 相似文献
762.
Numerical simulation of the impact of vegetation index on the interannual variation of summer precipitation in the Yellow River Basin 总被引:1,自引:0,他引:1
Two sets of numerical experiments using the coupled National Center for Environmental Prediction General Circulation Model (NCEP/GCM T42L18) and the Simplified Simple Biosphere land surface scheme (SSiB) were carried out to investigate the climate impacts of fractional vegetation cover (FVC) and leaf area index (LAI) on East Asia summer precipitation, especially in the Yellow River Basin (YRB). One set employed prescribed FVC and LAI which have no interannual variations based on the climatology of vegetation distribution; the other with FVC and LAI derived from satellite observations of the International Satellite Land Surface Climate Project (ISLSCP) for 1987 and 1988. The simulations of the two experiments were compared to study the influence of FVC, LAI on summer precipitation interannual variation in the YRB. Compared with observations and the NCEP reanalysis data, the experiment that included both the effects of satellite-derived vegetation indexes and sea surface temperature (SST) produced better seasonal and interannual precipitation variations than the experiment with SST but no interannual variations in FVC and LAI, indicating that better representations of the vegetation index and its interannual variation may be important for climate prediction. The difference between 1987 and 1988 indicated that with the increase of FVC and LAI, especially around the YRB, surface albedo decreased, net surface radiation increased, and consequently local evaporation and precipitation intensified. Further more, surface sensible heat flux, surface temperature and its diurnal variation decreased around the YRB in response to more vegetation. The decrease of surface-emitting longwave radiation due to the cooler surface outweighed the decrease of surface solar radiation income with more cloud coverage, thus maintaining the positive anomaly of net surface radiation. Further study indicated that moisture flux variations associated with changes in the general circulation also contributed to the precipitation interannual variation. 相似文献
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Haiqin Li Masao Kanamitsu Song-You Hong Kei Yoshimura Daniel R. Cayan Vasubandhu Misra Liqiang Sun 《Climatic change》2014,122(4):609-619
This study examines a future climate change scenario over California in a 10-km coupled regional downscaling system of the Regional Spectral Model for the atmosphere and the Regional Ocean Modeling System for the ocean forced by the global Community Climate System Model version 3.0 (CCSM3). In summer, the coupled and uncoupled downscaled experiments capture the warming trend of surface air temperature, consistent with the driving CCSM3 forcing. However, the surface warming change along the California coast is weaker in the coupled downscaled experiment than it is in the uncoupled downscaling. Atmospheric cooling due to upwelling along the coast commonly appears in both the present and future climates, but the effect of upwelling is not fully compensated for by the projected large-scale warming in the coupled downscaling experiment. The projected change of extreme warm events is quite different between the coupled and uncoupled downscaling experiments, with the former projecting a more moderate change. The projected future change in precipitation is not significantly different between coupled and uncoupled downscaling. Both the coupled and uncoupled downscaling integrations predict increased onshore sea breeze change in summer daytime and reduced offshore land breeze change in summer nighttime along the coast from the Bay area to Point Conception. Compared to the simulation of present climate, the coupled and uncoupled downscaling experiments predict 17.5 % and 27.5 % fewer Catalina eddy hours in future climate respectively. 相似文献
768.
多普勒雷达基本观测量直接同化对模式物理量场的影响 总被引:2,自引:1,他引:2
在GRAPES一3DVar雷达同化模块的基础上,建立了多普勒径向速度和基本反射率因子的直接同化观测算子,实现了雷达反射率因子和径向速度的直接同化,并对2007年7月3日的江淮梅雨进行了模拟试验。结果表明,多普勒径向速度的直接同化的主要影响表现在风场上,能够改善几乎整个三维风场分析,在雷达影响半径范围内,风场明显得到加强,影响当时天气的系统及其高低层配置被合理模拟,但对湿度场影响甚微。雨水混合比的直接同化的主要影响表现在湿度场上,改进了模式对湿度场的模拟,对降水的影响十分显著,有利于准确模拟降水的发展和维持,减小了Spin—up现象;其亦可使整个风场微弱增强,但影响甚微。 相似文献
769.
我国南方晚稻孕穗期旱灾指标试验研究 总被引:1,自引:0,他引:1
根据我国南方晚稻孕穗普遍期后对干旱最敏感这一特点,分别在江西南昌、湖北荆州、湖南长沙3个试验站设计了孕穗普遍期后7d、10d、13d、16d和直至植株死亡5种干旱天数。试验结果表明:干旱天数与穗粒数、穗结实粒数呈负相关,相关系数分别为-0.956和-0.959。随着干旱天数增加,土壤湿度逐渐减少,减产率上升。当干旱18d时,土壤湿度临界值为5.57%,植株死亡。用线性和非线性回归拟合干旱天数、土壤湿度、减产率三者之间的方程,分别以土壤湿度、减产率作为评价因子得出干旱灾害评价标准。经鉴定,自大田土壤上层无水开始干旱6~7d,晚稻受到轻度灾害;干旱8~11d,晚稻受中度灾害;干旱12d以上受重度灾害。 相似文献
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