| DOI: | 10.5194/tc-9-663-2015
|
| Scopus记录号: | 2-s2.0-84927733878
|
| 论文题名: | On producing sea ice deformation data sets from SAR-derived sea ice motion |
| 作者: | Bouillon S; , Rampal P
|
| 刊名: | Cryosphere
|
| ISSN: | 19940416
|
| 出版年: | 2015
|
| 卷: | 9, 期:2 | | 起始页码: | 663
|
| 结束页码: | 673
|
| 语种: | 英语
|
| 英文关键词: | cryosphere
; data set
; deformation
; freezing
; ice flow
; RADARSAT
; sea ice
; synthetic aperture radar
; triangulation
|
| 英文摘要: | We propose a method to reduce the error generated when computing sea ice deformation fields from synthetic aperture radar (SAR)-derived sea ice motion. The method is based on two steps. The first step consists of using a triangulation of the positions taken from the sea ice trajectories to define a mesh on which a first estimate of sea ice deformation is computed. The second step consists of applying a specific smoother to the deformation field to reduce the artificial noise that arises along discontinuities in the sea ice motion field. This method is here applied to RADARSAT Geophysical Processor System (RGPS) sea ice trajectories having a temporal and spatial resolution of about 3 days and 10 km, respectively. From the comparison between unfiltered and filtered fields, we estimate that the artificial noise causes an overestimation of about 60% of opening and closing. The artificial noise also has a strong impact on the statistical distribution of the deformation and on the scaling exponents estimated with multifractal analysis. We also show that a similar noise is present in the deformation fields provided in the widely used four-point deformation RGPS data set. These findings may have serious implications for previous studies as the constant overestimation of the opening and closing could lead to a large overestimation of freezing in leads, salt rejection and sea ice ridging. © Author(s) 2015. |
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/75319
|
| Appears in Collections: | 影响、适应和脆弱性
气候变化与战略
|
|
There are no files associated with this item.
|
|
作者单位: | Nansen Environmental and Remote Sensing Center, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway
|
| Recommended Citation: | |
Bouillon S,, Rampal P. On producing sea ice deformation data sets from SAR-derived sea ice motion[J]. Cryosphere,2015-01-01,9(2)
|
|
|