全文获取类型
收费全文 | 123篇 |
免费 | 19篇 |
国内免费 | 1篇 |
专业分类
大气科学 | 15篇 |
地球物理 | 31篇 |
地质学 | 74篇 |
海洋学 | 2篇 |
天文学 | 18篇 |
自然地理 | 3篇 |
出版年
2023年 | 2篇 |
2022年 | 3篇 |
2021年 | 6篇 |
2020年 | 2篇 |
2019年 | 5篇 |
2018年 | 8篇 |
2017年 | 8篇 |
2016年 | 16篇 |
2015年 | 7篇 |
2014年 | 10篇 |
2013年 | 7篇 |
2012年 | 5篇 |
2011年 | 12篇 |
2010年 | 9篇 |
2009年 | 5篇 |
2008年 | 9篇 |
2007年 | 7篇 |
2006年 | 5篇 |
2004年 | 4篇 |
2003年 | 6篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1997年 | 1篇 |
1994年 | 2篇 |
1981年 | 1篇 |
排序方式: 共有143条查询结果,搜索用时 15 毫秒
141.
PAH transport by sinking particles in the open Mediterranean Sea: a 1 year sediment trap study 总被引:1,自引:0,他引:1
Bouloubassi I Méjanelle L Pete R Fillaux J Lorre A Point V 《Marine pollution bulletin》2006,52(5):560-571
One year time series of sinking particles were collected at two depths in the open Mediterranean Sea and analysed for polycyclic aromatic hydrocarbons (PAH). Average total PAH concentrations were 593+/-284 ng g(-1) at 250 m and 551 +/- 198 ng g(-1) at 2850 m. Total PAH fluxes averaged 73 +/- 58 ng m(-2) d(-1) at 250 m and 53 +/- 39 ng m(-2) d(-1) at 2850 m. Contamination levels and, thus, exposure of marine organisms to PAH are comparable in surface and deep waters. Deep waters appear as a significant, yet overlooked, PAH sink. PAH temporal patterns show noticeable seasonality. This is partly due to varying levels of specific components such as the winter increase of pyrolytic PAH. Downward transport processes and the nature of sinking particles also impact on PAH fluxes, as inferred during periods of increasing productivity. Different phase-associations and interactions with particulate organic carbon for low-MW fossil PAH and high-MW pyrolytic PAH influence their downward transport efficiency. 相似文献
142.
Environmental controls on 10Be‐based catchment‐averaged denudation rates along the western margin of the Peruvian Andes 下载免费PDF全文
Regina Reber Romain Delunel Fritz Schlunegger Camille Litty Andrea Madella Naki Akçar Marcus Christl 《地学学报》2017,29(5):282-293
We present 10Be‐based basin‐averaged denudation rates for the entire western margin of the Peruvian Andes. Denudation rates range from c. 9 mm ka?1 to 190 mm ka?1 and are related neither to the subduction of the Nazca plate nor to the current seismicity along the Pacific coast and the occurrence of raised Quaternary marine terraces. Therefore, we exclude a tectonic control on denudation on a millennial time‐scale. Instead, we explain >60% of the observed denudation rates with a model where erosion rates increase either with mean basin slope angles or with mean annual water discharge. These relationships suggest a strong environmental control on denudation. 相似文献
143.
Beucher Romain Sue Christian Tricart Pierre 《International Journal of Earth Sciences》2017,106(8):2973-2990
International Journal of Earth Sciences - We present a new analysis of the late Alpine brittle deformation in the southern branch of the western Alpine arc, focusing on the stack of internal... 相似文献