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951.
NCEP/NCAR reanalysis data and the spectral atmospheric general circulation Model (AGCM)
of IAP/LASG (SAMIL) are employed to investigate the transport and balance of atmospheric angular
momentum (AAM). It is demonstrated that SAMIL depicts the general features of the AAM transport
and balance reasonably well. The AAM sources are in the tropics and sinks are in the mid-latitudes.
The strongest meridional transport occurs in the upper troposphere. The atmosphere gains westerly
momentum and transports it upward in the areas of surface easterlies, and downward into the areas
of surface westerlies. Consequently, AAM balance is maintained. Systematic biases of the model
compared to the reanalysis and observations are revealed. Possible mechanisms for these biases are
investigated. In SAMIL, the friction torque in the tropics is stronger compared to the observations,
which is probably due to the excessive precipitation along the Inter-tropical convergence zone (ITCZ)
in the model, since the simulated Hadley circulation is much stronger than observed. In the winter
half of the year, the transport center is in the lower troposphere in the SAMIL model, but it is in
the upper troposphere in the reanalysis and observations. These discrepancies also suggest that
simulations of convection and tropical precipitation need to be improved and that higher resolution
is necessary for a quantitative simulation of AAM transport and balance. Results also demonstrate
that the analysis of the transport and balance of atmospheric angular momentum is a powerful tool
in diagnosing climate models for potential improvement. 相似文献
952.
The vertical structures of atmospheric temperature anomalies associated with El Nio are simulated with a spectrum atmospheric general circulation model developed by LASG/IAP (SAMIL). Sensitivity of the model’s response to convection scheme is discussed. Two convection schemes, i.e., the revised Zhang and Macfarlane (RZM) and Tiedtke (TDK) convection schemes, are employed in two sets of AMIP-type (Atmospheric Model Intercomparison Project) SAMIL simulations, respectively. Despite some deficiencies in the up... 相似文献
953.
Using the Flexible Global Ocean--Atmosphere--Land System model (FGOALS)
version g1.11, a group of seasonal hindcasting experiments were carried out.
In order to investigate the potential predictability of sea surface
temperature (SST), singular value decomposition (SVD) analyses were applied
to extract dominant coupled modes between observed and predicated SST from
the hindcasting experiments in this study. The fields discussed are sea
surface temperature anomalies over the tropical Pacific basin
(20oS--20oN, 120oE--80oW), respectively starting in four
seasons from 1982 to 2005. On the basis of SVD analysis, the simulated
pattern was replaced with the corresponding observed pattern to reconstruct
SST anomaly fields to improve the ability of the simulation. The predictive
skill, anomaly correlation coefficients (ACC), after systematic error
correction using the first five modes was regarded as potential
predictability. Results showed that: 1) the statistical postprocessing
approach was effective for systematic error correction; 2) model error
sources mainly arose from mode 2 extracted from the SVD analysis---that is,
during the transition phase of ENSO, the model encountered the spring
predictability barrier; and 3) potential predictability (upper limits of
predictability) could be high over most of the tropical Pacific basin,
including the tropical western Pacific and an extra 10-degrees region of the
mid and eastern Pacific. 相似文献
954.
利用1990~2009年在珠江三角洲附近登陆的热带气旋影响期间广州白云机场的实况资料,统计分析热带气旋位置、强度与白云机场风向风速的关系. 相似文献
955.
西北太平洋热带气旋降水特征分析 总被引:6,自引:4,他引:2
利用1997—2006年GPCP(Global Precipitation Climatology Project)逐日卫星降水资料、上海台风研究所西北太平洋热带气旋资料,研究了近10年西北太平洋热带气旋降水的时空分布特征。发现整个西北太平洋区域多年平均TC(tropical cyclone)降水为175 mm,TC降水占总降水的比率为12%。年均TC降水场有两个极大值区域,分别位于菲律宾北部和菲律宾以东洋面。纬带平均的经向分布显示,总降水呈双峰分布,主、次峰值分别出现在6°N和35°N;而TC降水呈单峰分布,峰值出现在16°N。10年中TC降水以2004年最强;El Ni?o年TC降水在135°E以东偏多,而在南海中部和菲律宾至台湾等地区偏少;La Ni?a年TC降水在南海地区偏多,在菲律宾以东地区则显著偏少。 相似文献
956.
957.
利用1949—2003年近55 a的西北太平洋热带气旋(WNPTC)移动路径6 h中心经纬度矢量资料,矢量栅格化到1°×1°网格,统计WNPTC出现的次数、不同移动方向的次数及走向率,结果表明:(1)西北太平洋热带气旋空间分布具有积聚性,从生成源区向外递减。WNPTC消亡区在陆地比较集中,而洋面上相对离散;(2)WNPTC季节变化明显,冬季大值中心纬度最低,春季次之,夏季达到最高,秋季较夏季向南偏移1~3个纬度;(3)在El Nino次年热带气旋增多的区域,而La Nina次年热带气旋减少,15°N附近为分界线,反之亦然;(4)西北太平洋热带气旋移动方向和走向率除具有明显的纬向分布特点,在经向方向上也有差异;各个移动方向区域与其相对应的走向率区域基本相同,但是最大值中心并不重合。 相似文献
958.
利用地面加密雨量站、常规探空资料、卫星云图黑体辐射亮温(TBB)资料以及每6 h一次的1°×1°NCEP再分析资料,使用天气学诊断方法,初步剖析了2010年8月7—8日引发舟曲特大泥石流暴雨天气过程的降水特征、天气背景、对流暴雨中尺度系统演变特征及其成因。结果表明:引发舟曲特大泥石流暴雨的是一具有长生命史的移动性中尺度对流系统;暴雨前期的水汽积累与热带低压"电母"外围的偏东偏南气流将西太平洋的水汽远距离地输送到舟曲及其以北地区密切相关;热带低压外围向西北方向传播的东风波扰动和大陆高压北侧东移南压的西风带短波槽共同作用导致前期控制我国长江以北大部地区的副热带高压带断裂,为舟曲暴雨发生提供了必要的动力条件;高原地形对北方冷空气阻挡绕流迫使其与西进北上的暖湿气流交汇在甘南地区形成辐合、东风气流下高原东坡动力强迫抬升以及高原东坡热力作用在舟曲强降水形成过程中也可能起到重要作用。 相似文献
959.
In this paper,we discussed the features of atmospheric circulations over Eurasia as a response to sea surface temperature anomalies (SSTAs) over the tropical Indian Ocean,the equatorial Pacific,Kuroshio and the North Atlantic.Our results are shown as follows: (1) CAM3.0,driven by the combined SSTAs over the four oceanic regions,can simulate well the features of anomalous atmospheric circulations over Eurasia in January 2008,indicating that the effects of the SSTAs over these four regions were one of the key causes of the anomalous systems over Eurasia.(2) The SSTAs over each key region contributed to the intensification of blocking over the Urals Mountains and a main East Asian trough.However,the influence of the SSTAs over individual oceanic regions differed from one another in other aspects.The SSTAs over the North Atlantic had an impact on the 500-hPa anomalous height (Z500A) over the middle-high latitudes and had a somewhat smaller effect over the low latitudes.For the warm SSTAs over Kuroshio,the subtropical high was much stronger,spread farther north than usual,and had an anomalous easterly that dominated the northwest Pacific Ocean.The warm SSTAs over the tropical Indian Ocean could have caused a negative Z500A from West Asia to Middle Asia,a remarkably anomalous southwesterly from the Indian Ocean to the south of China and an anomalous anticyclone circulation over the South China Sea-Philippine Sea region.Because of the La Nia event,the winter monsoon was stronger than normal,with an anomalously cooler northerly over the southeastern coastal areas of China.(3) The combined effects of the SSTAs over the four key regions were likely more important to the atmospheric circulation anomalies of January 2008 over Eurasia than the effects of individual or partly combined SSTAs.This unique SSTA distribution possibly led to the circulation anomalies over Eurasia in January 2008,especially the atmospheric circulation anomalies over the subtropics,which were more similar to those of the winter El Ni?o events than to the circulation anomalies following La Nia. 相似文献
960.