DOI: 10.5194/tc-12-935-2018
Scopus记录号: 2-s2.0-85044137129
论文题名: Impact of rheology on probabilistic forecasts of sea ice trajectories: Application for search and rescue operations in the Arctic
作者: Rabatel M ; , Rampal P ; , Carrassi A ; , Bertino L ; , Jones C ; K ; R ; T
刊名: Cryosphere
ISSN: 19940416
出版年: 2018
卷: 12, 期: 3 起始页码: 935
结束页码: 953
语种: 英语
英文关键词: drift behavior
; ensemble forecasting
; hindcasting
; ice drift
; Lagrangian analysis
; Monte Carlo analysis
; numerical model
; probability
; rheology
; search and rescue
; seasonal variation
; sensitivity analysis
; trajectory
; Arctic
英文摘要: We present a sensitivity analysis and discuss the probabilistic forecast capabilities of the novel sea ice model neXtSIM used in hindcast mode. The study pertains to the response of the model to the uncertainty on winds using probabilistic forecasts of ice trajectories. neXtSIM is a continuous Lagrangian numerical model that uses an elasto-brittle rheology to simulate the ice response to external forces. The sensitivity analysis is based on a Monte Carlo sampling of 12 members. The response of the model to the uncertainties is evaluated in terms of simulated ice drift distances from their initial positions, and from the mean position of the ensemble, over the mid-term forecast horizon of 10 days. The simulated ice drift is decomposed into advective and diffusive parts that are characterised separately both spatially and temporally and compared to what is obtained with a free-drift model, that is, when the ice rheology does not play any role in the modelled physics of the ice. The seasonal variability of the model sensitivity is presented and shows the role of the ice compactness and rheology in the ice drift response at both local and regional scales in the Arctic. Indeed, the ice drift simulated by neXtSIM in summer is close to the one obtained with the free-drift model, while the more compact and solid ice pack shows a significantly different mechanical and drift behaviour in winter. For the winter period analysed in this study, we also show that, in contrast to the free-drift model, neXtSIM reproduces the sea ice Lagrangian diffusion regimes as found from observed trajectories. The forecast capability of neXtSIM is also evaluated using a large set of real buoy's trajectories and compared to the capability of the free-drift model. We found that neXtSIM performs significantly better in simulating sea ice drift, both in terms of forecast error and as a tool to assist search and rescue operations, although the sources of uncertainties assumed for the present experiment are not sufficient for complete coverage of the observed IABP positions. © Author(s) 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75399
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Nansen Environmental and Remote Sensing Center, Bergen, Norway; Department of Mathematics, University of North Carolina, Chapel Hill, United States
Recommended Citation:
Rabatel M,, Rampal P,, Carrassi A,et al. Impact of rheology on probabilistic forecasts of sea ice trajectories: Application for search and rescue operations in the Arctic[J]. Cryosphere,2018-01-01,12(3)