气候变化领域集成服务门户(CCPortal): Generating synthetic fjord bathymetry for coastal Greenland

CCPortal

DOI	10.5194/tc-11-363-2017
	Generating synthetic fjord bathymetry for coastal Greenland
	Williams C.N.; Cornford S.L.; Jordan T.M.; Dowdeswell J.A.; Siegert M.J.; Clark C.D.; Swift D.A.; Sole A.; Fenty I.; Bamber J.L.
发表日期	2017
ISSN	19940416
卷号	11 期号:1
英文摘要	Bed topography is a critical boundary for the numerical modelling of ice sheets and ice-ocean interactions. A persistent issue with existing topography products for the bed of the Greenland Ice Sheet and surrounding sea floor is the poor representation of coastal bathymetry, especially in regions of floating ice and near the grounding line. Sparse data coverage, and the resultant coarse resolution at the ice-ocean boundary, poses issues in our ability to model ice flow advance and retreat from the present position. In addition, as fjord bathymetry is known to exert strong control on ocean circulation and ice-ocean forcing, the lack of bed data leads to an inability to model these processes adequately. Since the release of the last complete Greenland bed topography-bathymetry product, new observational bathymetry data have become available. These data can be used to constrain bathymetry, but many fjords remain completely unsampled and therefore poorly resolved. Here, as part of the development of the next generation of Greenland bed topography products, we present a new method for constraining the bathymetry of fjord systems in regions where data coverage is sparse. For these cases, we generate synthetic fjord geometries using a method conditioned by surveys of terrestrial glacial valleys as well as existing sinuous feature interpolation schemes. Our approach enables the capture of the general bathymetry profile of a fjord in north-west Greenland close to Cape York, when compared to observational data. We validate our synthetic approach by demonstrating reduced overestimation of depths compared to past attempts to constrain fjord bathymetry. We also present an analysis of the spectral characteristics of fjord centrelines using recently acquired bathymetric observations, demonstrating how a stochastic model of fjord bathymetry could be parameterised and used to create different realisations. © Author(s) 2017.
学科领域	bathymetry; fjord; floating ice; ice flow; ice-ocean interaction; interpolation; numerical model; seafloor; topography; Arctic; Australia; Cape York; Greenland; Greenland Ice Sheet; Queensland
语种	英语
scopus关键词	bathymetry; fjord; floating ice; ice flow; ice-ocean interaction; interpolation; numerical model; seafloor; topography; Arctic; Australia; Cape York; Greenland; Greenland Ice Sheet; Queensland
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119448
作者单位	Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol, United Kingdom; Scott Polar Research Institute, University of Cambridge, Cambridge, United Kingdom; Grantham Institute, Department of Earth Science and Engineering, Imperial College London, London, United Kingdom; Department of Geography, University of Sheffield, Sheffield, United Kingdom; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Williams C.N.,Cornford S.L.,Jordan T.M.,et al. Generating synthetic fjord bathymetry for coastal Greenland[J],2017,11(1).
APA	Williams C.N..,Cornford S.L..,Jordan T.M..,Dowdeswell J.A..,Siegert M.J..,...&Bamber J.L..(2017).Generating synthetic fjord bathymetry for coastal Greenland.Cryosphere,11(1).
MLA	Williams C.N.,et al."Generating synthetic fjord bathymetry for coastal Greenland".Cryosphere 11.1(2017).