大小的巨大洞穴下曼哈顿Thwaites冰川在南极洲西部——卫星和机载雷达数据组合怎么样?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 04 - 01 - t04:13:11z //www.hoelymoley.com/feeds/question/16160 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/16160 4 大小的巨大洞穴下曼哈顿Thwaites冰川在南极洲西部——卫星和机载雷达数据组合怎么样? uhoh //www.hoelymoley.com/users/6031 2019 - 02 - 04 - t02:21:06z 2019 - 04 - 06 - t22:31:31z < p >这是一个后续的问题< a href = " //www.hoelymoley.com/q/16140/6031 " >巨人洞穴Thwaites冰川下曼哈顿的大小在南极洲西部< / >。< / p >

The work is reported in an open access paper in Science: Heterogeneous retreat and ice melt of Thwaites Glacier, West Antarctica which is very technical, thorough, and hard for me to understand.

The work is based on a substantial amount of radar data, both SAR (Synthetic Aperture Radar) from several satellites, and (from Pasadena Now) ...by ice-penetrating radar in NASA’s Operation IceBridge, an airborne campaign that began in 2010 and studies connections between the polar regions and the global climate.

Is it possible to explain the differences between the two kinds of radar data (space and airborne) and how they were combined and used together to establish the size/volume and growth of this unexpectedly large amount of liquid water below the glacier?

//www.hoelymoley.com/questions/16160/-/16161 # 16161 4 回答为巨大的洞穴Camilo Rada Thwaites冰川下曼哈顿的大小在南极洲西部——卫星和机载雷达数据组合怎么样? 卡米洛·Rada //www.hoelymoley.com/users/11908 2019 - 02 - 04 - t05:40:59z 2019 - 02 - 04 - t05:40:59z < p >的论文基本上结合了多个数据集求出冰面高程的变化和冰厚度在潮汐和多年的时间尺度。这样他们能够研究接地冰线迁移,和冰川的融化率及其对应的冰架从上方和下方。然后他们可以推断的过程生产冰川融化,特别是基底融化,很难直接测量。< / p >

They actually used three datasets:

  1. DInSAR: Standing for Differential Interferometric Synthetic Aperture Radar. It is basically a technique that compares the phase of two SAR images acquired at different time to compute uplift/subsidence of the surface with great accuracy (usually millimeters). So they were able to see the surface of the ice shelf rise and lower with the tides, and also compute surface flow velocities.

  2. IceBridge MCoRDS: Airborne radar depth sounder MCoRDS (Multichannel Coherent Radar Depth Sounder) operated by NASA mission IceBridge. This is a much more powerful radar operated close to the surface and designed to penetrate the ice, allowing to see the bedrock topography beneath the ice and some of the structure above the bedrock, such as water/ice transitions or layers of ice with distinct dielectric properties. This allowed them to know the ice thickness and bedrock topography.

  3. TDX DEM: TanDEM-X Digital Elevation Model. This are Surface topography models generated using single pass InSAR data provided by two SAR satellites that orbit in tandem formation (one immediately behind the other). This allows precise surface topography measurements, that are also needed for the DInSAR processing.

I hope that helps. It is a very interesting work. Although the "giant cavern" part is not the most relevant part of it at all, but it was great for catchy headlines.
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