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英国研究利用卫星追踪潮汐变化以实现更安全的航行 快报文章
资源环境快报,2025年第10期
作者:  魏艳红
Microsoft Word(16Kb)  |  收藏  |  浏览/下载:384/0  |  提交时间:2025/05/29
NOC  Satellites Technology  Navigation Channels  
俄科学家正在研发基于地球重力场的抗干扰自主导航系统 快报文章
地球科学快报,2023年第12期
作者:  刘文浩
Microsoft Word(22Kb)  |  收藏  |  浏览/下载:552/0  |  提交时间:2023/06/25
Earth's gravitational field  Interference free autonomous navigation technology  
Bathymetry-Constrained Navigation of Argo Floats Under Sea Ice on the Antarctic Continental Shelf 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (11)
作者:  Wallace, L. O.;  van Wijk, E. M.;  Rintoul, S. R.;  Hally, B.
收藏  |  浏览/下载:25/0  |  提交时间:2020/05/13
Argo profiling floats  navigation  sea ice  Antarctic continental shelf  polynya  
Months-long thousand-kilometre-scale wobbling before great subduction earthquakes 期刊论文
NATURE, 2020, 580 (7805) : 628-+
作者:  Son, Hyungmok;  Park, Juliana J.;  Ketterle, Wolfgang;  Jamison, Alan O.
收藏  |  浏览/下载:31/0  |  提交时间:2020/05/13

Observed reversals in GNSS surface motions suggests greatly enhanced slab pull in the months preceding the great subduction earthquakes in Maule (Chile, 2010) and Tohoku-oki (Japan, 2011) of moment magnitudes 8.8 and 9.0.


Megathrust earthquakes are responsible for some of the most devastating natural disasters(1). To better understand the physical mechanisms of earthquake generation, subduction zones worldwide are continuously monitored with geophysical instrumentation. One key strategy is to install stations that record signals from Global Navigation Satellite Systems(2,3) (GNSS), enabling us to track the non-steady surface motion of the subducting and overriding plates before, during and after the largest events(4-6). Here we use a recently developed trajectory modelling approach(7) that is designed to isolate secular tectonic motions from the daily GNSS time series to show that the 2010 Maule, Chile (moment magnitude 8.8) and 2011 Tohoku-oki, Japan (moment magnitude 9.0) earthquakes were preceded by reversals of 4-8 millimetres in surface displacement that lasted several months and spanned thousands of kilometres. Modelling of the surface displacement reversal that occurred before the Tohoku-oki earthquake suggests an initial slow slip followed by a sudden pulldown of the Philippine Sea slab so rapid that it caused a viscoelastic rebound across the whole of Japan. Therefore, to understand better when large earthquakes are imminent, we must consider not only the evolution of plate interface frictional processes but also the dynamic boundary conditions from deeper subduction processes, such as sudden densification of metastable slab.


  
Measuring Greenland Ice Sheet Melt Using Spaceborne GNSS Reflectometry From TechDemoSat-1 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (2)
作者:  Li, Weiqiang;  Cardellach, Estel;  Fabra, Fran;  Ribo, Serni;  Rius, Antonio
收藏  |  浏览/下载:18/0  |  提交时间:2020/07/02
Greenland ice sheet  melt  Global Navigation Satellite System  bistatic radar  
Decoding the development of the human hippocampus 期刊论文
NATURE, 2020, 577 (7791) : 531-+
作者:  Zhong, Suijuan;  Ding, Wenyu;  Sun, Le;  Lu, Yufeng;  Dong, Hao;  Fan, Xiaoying;  Liu, Zeyuan;  Chen, Ruiguo;  Zhang, Shu;  Ma, Qiang;  Tang, Fuchou;  Wu, Qian;  Wang, Xiaoqun
收藏  |  浏览/下载:40/0  |  提交时间:2020/07/03

The hippocampus is an important part of the limbic system in the human brain that has essential roles in spatial navigation and the consolidation of information from short-term memory to long-term memory(1,2). Here we use single-cell RNA sequencing and assay for transposase-accessible chromatin using sequencing (ATAC-seq) analysis to illustrate the cell types, cell linage, molecular features and transcriptional regulation of the developing human hippocampus. Using the transcriptomes of 30,416 cells from the human hippocampus at gestational weeks 16-27, we identify 47 cell subtypes and their developmental trajectories. We also identify the migrating paths and cell lineages of PAX6(+) and HOPX+ hippocampal progenitors, and regional markers of CA1, CA3 and dentate gyrus neurons. Multiomic data have uncovered transcriptional regulatory networks of the dentate gyrus marker PROX1. We also illustrate spatially specific gene expression in the developing human prefrontal cortex and hippocampus. The molecular features of the human hippocampus at gestational weeks 16-20 are similar to those of the mouse at postnatal days 0-5 and reveal gene expression differences between the two species. Transient expression of the primate-specific gene NBPF1 leads to a marked increase in PROX1(+) cells in the mouse hippocampus. These data provides a blueprint for understanding human hippocampal development and a tool for investigating related diseases.


Single-cell RNA sequencing is used to catalogue and explore the developmental trajectories of more than 30,000 cells in the developing human hippocampus.


  
Lake Level and Surface Topography Measured With Spaceborne GNSS-Reflectometry From CYGNSS Mission: Example for the Lake Qinghai 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2018, 45 (24) : 13332-13341
作者:  Li, Weiqiang;  Cardellach, Estel;  Fabra, Fran;  Ribo, Serni;  Rius, Antonio
收藏  |  浏览/下载:20/0  |  提交时间:2019/04/09
hydrology  geodesy  Global Navigation Satellite System  bistatic radar  altimetry  
Real-Time Sensing of Precipitable Water Vapor From BeiDou Observations: Hong Kong and CMONOC Networks 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2018, 123 (15) : 7897-7909
作者:  Li, Xingxing;  Tan, Han;  Li, Xin;  Dick, Galina;  Wickert, Jens;  Schuh, Harald
收藏  |  浏览/下载:10/0  |  提交时间:2019/04/09
precipitable water vapor  BeiDou Navigation Satellite System  real-time PWV  precise point positioning  Hong Kong CORS  CMONOC  
Ice over troubled waters: navigating the Northwest Passage using Inuit knowledge and scientific information 期刊论文
CLIMATE RESEARCH, 2018, 75 (1) : 81-94
作者:  Panikkar, Bindu;  Lemmond, Benjamin;  Else, Brent;  Murray, Maribeth
收藏  |  浏览/下载:10/0  |  提交时间:2019/04/09
Northwest Passage  Navigation  Inuit knowledge  Sea ice  climate change  
First spaceborne phase altimetry over sea ice using TechDemoSat-1 GNSS-R signals 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2017, 44 (16)
作者:  Li, Weiqiang;  Cardellach, Estel;  Fabra, Fran;  Rius, Antonio;  Ribo, Serni;  Martin-Neira, Manuel
收藏  |  浏览/下载:12/0  |  提交时间:2019/04/09
Global Navigation Satellite System reflectometry  altimetry  sea ice  carrier phase