籍工场分享 http://blog.sciencenet.cn/u/jlpemail

博文

[转载]地球扁率变小?

已有 2525 次阅读 2013-1-9 06:09 |个人分类:卫星与激光|系统分类:海外观察|关键词:地球| 地球 |文章来源:转载

Deceleration in the Earth's Oblateness
  1. Minkang Cheng*,
  2. Byron D. Tapley,
  3. John C. Ries

 

Keywords:

  • SLR;
  • J2 variations

                     Abstract

[1] For over three decades, satellite laser ranging (SLR) has recorded the global nature of the long-wavelength mass change within the Earth system. Analysis of the most recent time series of 30-day SLR-based estimates of Earth's dynamical oblateness, characterized by the gravitational degree-2 zonal spherical harmonic J2, indicates that the long-term variation of J2 appears to be more quadratic than linear in nature. The superposition of a quadratic and an 18.6-year variation leads to the ‘unknown decadal variation’ reported by Cheng and Tapley [2004]. Although the primary trend is expected to be linear due to global isostatic adjustment (GIA), there is an evident deceleration in the rate of the decrease in J2 during the last few decades, likely due to changes in the rate of the global mass redistribution from melting of the glaciers and ice sheets as well as mass changes in the atmosphere and ocean. © 2013 American Geophysical Union. All rights reserved.

 



http://blog.sciencenet.cn/blog-255-651188.html

上一篇:[转载]中国的卫星激光测距
下一篇:[转载]军委副主席专程考察解放军卫星导航定位总站

0

该博文允许注册用户评论 请点击登录 评论 (0 个评论)

数据加载中...
扫一扫,分享此博文

Archiver|手机版|科学网 ( 京ICP备14006957 )

GMT+8, 2019-12-11 00:51

Powered by ScienceNet.cn

Copyright © 2007- 中国科学报社

返回顶部