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排序方式: 共有461条查询结果,搜索用时 31 毫秒
371.
This study examines a Kuroshio main path(KMP) cut-off event east of Taiwan Island occurred in fall-winter2013–2014 and its impacts on the South China Sea(SCS) by analyzing satellite altimetry and mooring observations. Satellite altimeter sea level anomaly(SLA) images reveal a complete process that a huge cyclonic eddy(CE) from the Pacific collided with the Kuroshio and the western boundary from 15 October 2013 to 15 January 2014. Mooring observations evidenced that the Kuroshio upper ocean volume transport was cut off more than 82% from 17×106 m~3/s in September to 3×106 m~3/s in November 2013. The KMP cut-off event caused the Kuroshio branching and intruding into the SCS and strengthened the eddy kinetic energy in the northern SCS west of the Luzon Strait. Using the total momentum as a dynamic criterion to determine the role of eddy collision with the Kuroshio reasonably explains the KMP cut-off event. 相似文献
372.
Ocean Science Journal - In this study, a separation index for the East Korea Warm Current (EKWC) is defined by Lagrangian particle tracking using surface geostrophic currents based on... 相似文献
373.
Shin Hyeon Ho Li Zhun Seo Min Ho Soh Ho Young Lim Weol Ae Park Jong Woo 《Ocean Science Journal》2019,54(4):685-691
Ocean Science Journal - There have been controversies regarding the taxonomy of Prorocentrum donghaiense, however Zhang et al. (2016) recently developed a probe with a quantitative real-time PCR... 相似文献
374.
Kim Jin Ho Hong Sokjin Lee Won-Chan Kim Hyung Chul Eom Ki-Hyuk Jung Woo-Sung Kim Dong-Myung 《Ocean Science Journal》2019,54(4):559-571
Ocean Science Journal - Flushing time is a concept to show the characteristics of water exchange in the sea, and a longer flushing time generally translates as delayed water exchange and thus a... 相似文献
375.
Effect of Taiwan Strait Current on the onshore intrusion of Kuroshio: A geostrophic adjustment model
Young Ho Seung 《Ocean Science Journal》2012,47(1):41-50
The effect of the Taiwan Strait Current on the onshore intrusion of Kuroshio, both contributing to the formation of Tsushima
Warm Current, is addressed theoretically by invoking a geostrophic adjustment model previously proposed. The idealized model
assumes two unbounded basins, shallow and deep, separated by an infinitely long and thin barrier. On either side of the barrier,
a western boundary current in the deep basin and a shelf current in the shallow basin flow along the barrier with the surface
elevation of the former higher than that of the latter. When a part of the barrier is removed and a gap is created, the onshore
part of the western boundary current intrudes onto the shallow basin through the gap while conserving its potential vorticity.
Both the intruding current and the shelf current will later geostrophically adjust themselves to the disturbances created
by the intrusion. Model results show that the transport of onshore intrusion increases with the sea level difference imposed
initially between the deep and shallow basins across the barrier, indicating that the sea level rise associated with the strengthening
of shelf current inhibits the shelf-ward intrusion. The intruding current is in jet mode when its transport is maximized,
which otherwise is in coastal mode. The maximization of transport occurs when the sea level difference between the two basins
is sufficiently large. Although this model greatly idealizes the problem, it explains well the observed fact that the transport
of Tsushima Warm Current is fed mostly by the Taiwan Strait Current in summer when the latter becomes the strongest, and by
the onshore intrusion of Kuroshio in winter when the Taiwan Strait Current nearly vanishes, suggesting that the seasonal variation
of the onshore intrusion of Kuroshio is largely due to the seasonal variation in the strength of the Taiwan Strait Current. 相似文献
376.
Phytoplankton community reorganization driven by eutrophication and warming in Lake Biwa 总被引:1,自引:0,他引:1
Chih Hao Hsieh Kanako Ishikawa Yoichiro Sakai Toshiyuki Ishikawa Satoshi Ichise Yoshimasa Yamamoto Ting Chun Kuo Ho Dong Park Norio Yamamura Michio Kumagai 《Aquatic Sciences - Research Across Boundaries》2010,72(4):467-483
We compiled and analyzed long-term data, including chemical, physical and phytoplankton community data, for the Lake Biwa
ecosystem from 1962 to 2003. Analyses on environmental data indicate that Lake Biwa had experienced intensified eutrophication
(according to total phosphorus concentration) in the late 1960s and returned to a less eutrophic status around 1985, and then
exhibited rapid warming and thus increased water column stability since 1990. Total phytoplankton cell volume largely followed
the trend of total phosphorus concentration, albeit short-term fluctuations existed. However, phytoplankton community shifted
dramatically in response to those changes of environmental states. These shifts were cause by changes in trophic status driven
by phosphorus loadings and physical properties in the water column driven by warming. Moreover, most phytoplankton species
did not show a strong linear correlation with environmental variables, suggesting nonlinear transitions among different states. 相似文献
377.
In this paper, we use multi-satellite remote sensing data and Regional Ocean Model System (ROMS) to examine the physical and biological responses to Typhoon Nakri during a period from 1 to 8 June 2008 in the western North Pacific. From satellite observations, we find remarkable surface cooling (∼5 °C) and distinct phytoplankton enhancement after Nakri passage. It is interesting to note that in contrast to the well-documented rightward bias of the surface cooling response, the maximum biological response to Nakri occurred on the left of the Nakri’s track rather than the right side, where the most distinct cooling response occurred. To reveal the dynamic mechanism for this unusual phenomenon, we have done numerical experiments with and without the influence of preexisting cyclonic circulation and previous typhoon. The results from simulations show that both the physical and biological responses to Nakri are greatly affected by the preexisting cyclonic circulations. The discrepancy between the locations of maximum physical and biological responses mainly results from the advanced uplift and current advection of nutrient fields by previous typhoon Rammasun, which passed through the area about two weeks before Nakri. 相似文献
378.
In this study, the ability of macroalgae Gracilaria sp. of removing eutrophication factors and toxic heavy metals Al, Cr, and Zn in a closed cultivation system is reported.
The results show that the concentration of the three heavy metals decreased significantly during the experimental period in
an algal biomass dependent manner. The biofiltration capacity of the alga for Al, Cr, and Zn is 10.1%–72.6%, 52.5%–83.4% and
36.5%–91.7%, respectively. Using more materials resulted in stronger heavy metal removal. Additionally, the concentration
of chl-a, TN, TP and DIN of water samples from aquariums involving large, medium, and small algal biomass cultivation increased first
and then decreased during the experiment. COD value of all three groups decreased with time and displayed algal biomass dependency:
more algae resulting in a greater COD value than those of less biomass. Furthermore, changes in COD reflect an obvious organic
particles deprivation process of algae. This is the first report on heavy metal removal effect by Gracilaria species. The results suggest that macroalgae can be used as a biofilter for the treatment of nutrient-enriched or heavy-metal
polluted water, to which an appropriate time range should be carefully determined. 相似文献
379.
380.
Predicting the rainfall-triggered landslides in a forested mountain region using TRIGRS model 总被引:3,自引:0,他引:3
Landslides are natural disasters which can pose a serious threat to human and property in many areas around the world. The
Transient Rainfall Infiltration and Grid-based Regional Slope-stability (TRIGRS) model was used to investigate the rainfall-induced
shallow landslides in a forested mountain region, Korea. Various input data for TRIGRS model include time-varying rainfall,
topographic characteristics, soil depth, material strength, and hydraulic properties. A series of calculations were conducted
in determining the slope stability over the Jangheung region in Korea during the storm occurred on August 6, 1998. The results
show that TRIGRS model captured about 64.1% of landslides that were extracted from the IKONOS2 imageries. The model demonstrated
how the factor of safety changed with time during a storm considering both the transient and spatial responses of pore water
pressure in its slope stability calculation. 相似文献