全文获取类型
收费全文 | 1822篇 |
免费 | 626篇 |
国内免费 | 1606篇 |
专业分类
测绘学 | 8篇 |
大气科学 | 2515篇 |
地球物理 | 222篇 |
地质学 | 589篇 |
海洋学 | 389篇 |
天文学 | 12篇 |
综合类 | 79篇 |
自然地理 | 240篇 |
出版年
2024年 | 21篇 |
2023年 | 69篇 |
2022年 | 68篇 |
2021年 | 100篇 |
2020年 | 103篇 |
2019年 | 144篇 |
2018年 | 108篇 |
2017年 | 108篇 |
2016年 | 132篇 |
2015年 | 139篇 |
2014年 | 156篇 |
2013年 | 173篇 |
2012年 | 168篇 |
2011年 | 179篇 |
2010年 | 143篇 |
2009年 | 184篇 |
2008年 | 220篇 |
2007年 | 233篇 |
2006年 | 209篇 |
2005年 | 190篇 |
2004年 | 158篇 |
2003年 | 139篇 |
2002年 | 126篇 |
2001年 | 147篇 |
2000年 | 137篇 |
1999年 | 122篇 |
1998年 | 80篇 |
1997年 | 70篇 |
1996年 | 51篇 |
1995年 | 33篇 |
1994年 | 34篇 |
1993年 | 35篇 |
1992年 | 14篇 |
1991年 | 21篇 |
1990年 | 11篇 |
1989年 | 6篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1977年 | 4篇 |
1954年 | 1篇 |
排序方式: 共有4054条查询结果,搜索用时 15 毫秒
101.
QI Lin QIAO Yansong LI Yuehui WANG Yan PENG Shash HE Zexin YANG Shuaibin HAN Chao ZHANG Xujiao 《《地质学报》英文版》2017,91(3):1095-1108
In the East Asian monsoon region,eolian deposits widely distributed in the middle-lower reaches of the Yantgze River are among the best materials available for studies on Quaternary climate change in the subtropical zone of Southern China.Typical eolian deposits in this region include upper Xiashu Loess(XL) and underlying Vermiculated Red Soil(VRS) layers.In this paper,chronological and paleoclimatic studies are conducted on an eolian deposit sequence near Jiujiang(JJ) city in northern Jiangxi province.A magnetostratigraphic study,combined with optically stimulated luminescence(OSL) dating,is conducted on the JJ section and provides further evidence that eolian deposits in the middle-lower reaches of the Yangtze River have been formed since the late Early Pleistocene,and that the boundary age between the XL and VRS layers is about 300-400 kaBP.In grain-size records of the JJ section,the median grain-size and content of the 30 μm size fraction increase sharply after 300-400 kaBP,representing an East Asian winter monsoon intensification event.Further pollen analysis reveals differing pollen assemblages before and after 300-400 kaBP:there is an evident increase in plants adapted to grow in a warm humid environment after 300-400 kaBP,implying an increase in precipitation caused by intensification of the East Asian summer monsoon.Global ice volume and uplift of the Tibet Plateau(TP) are regarded as crucial factors influencing variations of the East Asian monsoon on a long-term scale.The deep-sea δ~(18)O record,which reflects variations in global ice volume,shows no obvious change after 300-400 kaBP.Moreover,the influence of global ice volume changes on the East Asian summer and winter monsoons is inverse;the global ice volume increase(decrease) implies a strengthened(weakened) winter monsoon and weakened(strengthened) summer monsoon.We therefore interpret the coupled intensifications of the East Asian summer and winter monsoons at about 300-400 kaBP to the uplift of the TP in the Middle Pleistocene.This climate event is also documented in eolian deposits from the southern margin of the Chinese Loess Plateau(CLP) and from the desert-loess transitional belt.However,it is not recorded in the loess-paleosol sequences from the central part of the CLP,thereby indicating differing climate responses to TP uplift in different regions,which requires further study. 相似文献
102.
103.
104.
中国西部植被覆盖变化对北方夏季气候影响的数值模拟 总被引:6,自引:0,他引:6
植被覆盖的变化是气候变化的成因之一,植被改变对气候的反馈可能会加强或者减缓气候的变化.文中利用CCM3全球气候模式以及20世纪70年代和90年代中国西部的植被覆盖资料进行数值模拟试验,研究了这两个时期植被变化对北方夏季区域气候的影响.模拟结果表明:植被增加的地方,地面吸收的辐射通量增加;植被减少的地方,地面吸收的辐射通量减少.地面辐射平衡的变化造成局地大气热量异常,并引起周边大气热量的调整,从而导致东亚地区夏季大气环流异常.相对于70年代的植被状况,用90年代植被模拟的北方地区对流层上层为异常气旋性环流,而中、低层为异常反气旋环流,东北亚到中国东部盛行异常北风,同时西太平洋副热带高压强度偏弱、位置偏南.这种异常环流特征说明模拟的90年代中国东部夏季风明显减弱,异常的环流形势造成华北和东北地区夏季水汽输送减少,水汽辐合减弱,年降水量减少了40 mm,呈现减少的特征,这是和观测事实是比较吻合的.降水和环流的异常还造成华北和东北夏季平均地面气温降低了0.4-0.8℃.因此近30年来中国西部植被变化可能是东亚夏季风年代际变化以及北方夏季降水减少的一个重要因素. 相似文献
105.
Bingdi Wang Qingquan Li Xinyong Shen Lili Dong Fang Wang Tao Wang Xinzhong Liang 《地球科学进展》2020,35(3):319-330
Based on the ERA-Interim atmospheric reanalysis data from the European Medium-Term Weather Forecast Center from 1979 to 2016 and the ERSSTv4 sea surface temperature data from the US National Oceanic and Atmospheric Administration, the regional climate model CWRF was used to simulate the climate characteristics in East Asia. The results show that the CWRF model can well reproduce the average characteristics of the East Asian winter monsoon circulation, including the location and intensity of the low-level continental cold high pressure and variation characteristics of wind field in high and low levels. The occurrence area and frequency of the north wind in the simulation and the reanalysis data were further calculated and compared. It is shown that they are basically consistent. The distribution of air temperature and precipitation over China are well represented by the model. The water vapor transport is also in good agreement with the reanalysis data. The water vapor from the Bay of Bengal plays a vital role in the precipitation over South China. The simulation results of apparent heat source and apparent moisture sink show that the model can well simulate the thermal difference between the East Asian continent and the adjacent sea area. The analysis results indicate that CWRF model has the ability to simulate the main characteristics of the East Asian winter monsoon. 相似文献
106.
Based on a zonally non-uniform mean circulation in summer simulated by numerical modelling,perturba-tion heatings ever South Asia and a perturbation cooling over Northwest Australia were incorporated in a nu-merical model to discuss their effects on summer monsoon over Asia and the structure of flow disturbance. 相似文献
107.
根据1991年5-8月江淮特大暴雨资料,使用功率谱和带通滤波结合的方法,研究了1991年夏季风和江淮梅雨的准周期振荡,探索季风对异常梅雨的影响。分析指出,1991年北半球夏季风活动,江淮流域湿度场和降雨量变化均存在显著的准24天周期振荡,夏季风的周期振荡,主要表现在西南季风(东南季风不明显),它的位相比降雨量提前2-4左右,其振幅大小较好地反映了降雨量的大小。 相似文献
108.
D. R. Pattanaik 《Pure and Applied Geophysics》2007,164(8-9):1527-1545
The present study is an attempt to examine the variability of convective activity over the north Indian Ocean (Bay of Bengal
and Arabian Sea) on interannual and longer time scale and its association with the rainfall activity over the four different
homogeneous regions of India (viz., northeast India, northwest India, central India and south peninsular India) during the
monsoon season from June to September (JJAS) for the 26 year period (1979 to 2004). The monthly mean Outgoing Long-wave Radiation
(OLR) data obtained from National Oceanic and Atmospheric Administration (NOAA) polar orbiting spacecraft are used in this
study and the 26-year period has been divided into two periods of 13 years each with period-i from 1979 to 1991 and period
-ii from 1992 to 2004. It is ascertained that the convective activity increases over the Arabian Sea and the Bay of Bengal
in the recent period (period -ii; 1992 to 2004) compared to that of the former period (period -i; 1979 to 1991) during JJAS
and is associated with a significantly increasing trend (at 95% level) of convective activity over the north Bay of Bengal
(NBAY). On a monthly scale, July and August also show increase in convective activity over the Arabian Sea and the Bay of
Bengal during the recent period and this is associated with slight changes in the monsoon activity cycle over India. The increase
in convective activity particularly over the Arabian Sea during the recent period of June is basically associated with about
three days early onset of the monsoon over Delhi and relatively faster progress of the monsoon northward from the southern
tip of India. Over the homogeneous regions of India the correlation coefficient (CC) of OLR anomalies over the south Arabian
Sea (SARA) is highly significant with the rainfall over central India, south peninsular India and northwest India, and for
the north Arabian Sea (NARA), it is significant with northwest India rainfall and south peninsular rainfall. Similarly, the
OLR anomalies over the south Bay of Bengal (SBAY) have significant CC with northwest India and south peninsular rainfall,
whereas the most active convective region of the NBAY is not significantly correlated with rainfall over India. It is also
found that the region over northeastern parts of India and its surroundings has a negative correlation with the OLR anomalies
over the NARA and is associated with an anomalous sinking (rising) motion over the northeastern parts of India during the
years of increase (decrease) of convective activity over the NARA. 相似文献
109.
应用广西1960年以来地面88个观测站日平均气温、降水量、相对温度、均风速、总云量等气象资料,以及1970-2001年ECMW F再分析资料850hPa比湿和垂直速度资料,分析南海夏季风异常早晚的广西气象要素特征。结果表明:南海夏季风偏早,广西地面气温偏低,季风爆发当候广西气候特征往多雨方向发生变化,而爆发之后气候趋于较正常状态;南海夏季风偏晚年,爆发前6候,地面气温高,在季风爆发后5候内降水量较多;南海夏季风偏早、偏晚与广西多数固定月、季时间尺度的气温、降水量的关系无明显增加线性相关。 相似文献
110.