全文获取类型
收费全文 | 152篇 |
免费 | 3篇 |
国内免费 | 9篇 |
专业分类
大气科学 | 14篇 |
地球物理 | 43篇 |
地质学 | 55篇 |
海洋学 | 38篇 |
天文学 | 9篇 |
综合类 | 1篇 |
自然地理 | 4篇 |
出版年
2024年 | 1篇 |
2022年 | 4篇 |
2021年 | 2篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 7篇 |
2017年 | 7篇 |
2016年 | 8篇 |
2015年 | 2篇 |
2014年 | 7篇 |
2013年 | 10篇 |
2012年 | 2篇 |
2011年 | 3篇 |
2010年 | 3篇 |
2009年 | 7篇 |
2008年 | 11篇 |
2007年 | 9篇 |
2006年 | 15篇 |
2005年 | 14篇 |
2004年 | 9篇 |
2003年 | 7篇 |
2002年 | 1篇 |
2001年 | 8篇 |
2000年 | 6篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1977年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有164条查询结果,搜索用时 125 毫秒
161.
162.
Yuichi Nosaka Tomonori Isada Isao Kudo Hiroaki Saito Hiroshi Hattori Atsushi Tsuda Koji Suzuki 《Journal of Oceanography》2014,70(1):91-103
We investigated the water-column light utilization efficiency (Ψ) of phytoplankton photosynthesis in the Western Subarctic Gyre (WSG) of the North Pacific during summer 2008. The Ψ values (0.64–1.86 g C [g Chl a]?1 [mol photon]?1 m2) obtained were observed to increase significantly with decreasing daily photosynthetic available radiation (PAR) and were generally higher than those of previous studies, not only from the subarctic Pacific but also from the world’s oceans. To examine the effect of iron availability on Ψ in the WSG, Ψ values were estimated from the data of two in situ iron fertilization experiments: the Subarctic Pacific Iron Experiment for Ecosystem Dynamics Study I (SEEDS-I) and II (SEEDS-II). We found that iron availability did not affect Ψ values. Overall, this study revealed that Ψ values changed remarkably in the WSG during the summer, and that higher values were found at the stations where moderate PAR levels (ca. 10–30 mol photons m?2 day?1) were observed and where autotrophic flagellates predominated in the phytoplankton assemblages. 相似文献
163.
Yoshimitsu Chikamoto Masahide Kimoto Masayoshi Ishii Takashi Mochizuki Takashi T. Sakamoto Hiroaki Tatebe Yoshiki Komuro Masahiro Watanabe Toru Nozawa Hideo Shiogama Masato Mori Sayaka Yasunaka Yukiko Imada 《Climate Dynamics》2013,40(5-6):1201-1222
Decadal climate predictability is examined in hindcast experiments by a multi-model ensemble using three versions of the coupled atmosphere-ocean model MIROC. In these hindcast experiments, initial conditions are obtained from an anomaly assimilation procedure using the observed oceanic temperature and salinity with prescribed natural and anthropogenic forcings on the basis of the historical data and future emission scenarios in the Intergovernmental Panel of Climate Change. Results of the multi-model ensemble in our hindcast experiments show that predictability of surface air temperature (SAT) anomalies on decadal timescales mostly originates from externally forced variability. Although the predictable component of internally generated variability has considerably smaller SAT variance than that of externally forced variability, ocean subsurface temperature variability has predictive skills over almost a decade, particularly in the North Pacific and the North Atlantic where dominant signals associated with Pacific decadal oscillation (PDO) and the Atlantic multidecadal oscillation (AMO) are observed. Initialization enhances the predictive skills of AMO and PDO indices and slightly improves those of global mean temperature anomalies. Improvement of these predictive skills in the multi-model ensemble is higher than that in a single-model ensemble. 相似文献
164.
The vertical distribution of arsenic and other trace and major elements has been studied in four sediment cores from Masuda
City, Nagashima and Okite in the Shimane Prefecture of southwestern Japan. The sediment cores were also subjected to leaching
techniques and 14C dating. The stratigraphic sequences in the cores consist of silt and sandy silt at top, passing downward into gray to black
clays. Elevated values of As, Pb, Zn, Cu, Ni, Cr, and V are present in several horizons while abundances of these elements
tend to be higher in the black and gray clays, probably due to adsorption onto clay sediments. Higher concentrations of Fe
and total sulfur (TS) occur in black clays. The correlations of the trace metals with iron suggest their adsorption onto Fe
(oxy)hydroxides, whereas correlations with sulfur in some cores indicate that they were precipitated as Fe-sulfides. Age determinations
suggest that clay horizons at ∼5 m depth were deposited at around 5,000 and 6,000 years BP (14C ages) during the transgressive phase of sea level change. The results of the leaching techniques in the core samples show
that higher amounts of As were extracted with deionized water. Even at neutral pH, As can be released from sediments to groundwater,
and therefore groundwater pollution is a concern in Masuda City and the surrounding area. 相似文献