气候变化领域集成服务门户(CCPortal): Arctic sea-ice diffusion from observed and simulated Lagrangian trajectories

CCPortal

DOI	10.5194/tc-10-1513-2016
	Arctic sea-ice diffusion from observed and simulated Lagrangian trajectories
	Rampal P.; Bouillon S.; Bergh J.; Ólason E.
发表日期	2016
ISSN	19940416
卷号	10 期号:4
英文摘要	We characterize sea-ice drift by applying a Lagrangian diffusion analysis to buoy trajectories from the International Arctic Buoy Programme (IABP) dataset and from two different models: the standalone Lagrangian sea-ice model neXtSIM and the Eulerian coupled ice-ocean model used for the TOPAZ reanalysis. By applying the diffusion analysis to the IABP buoy trajectories over the period 1979–2011, we confirm that sea-ice diffusion follows two distinct regimes (ballistic and Brownian) and we provide accurate values for the diffusivity and integral timescale that could be used in Eulerian or Lagrangian passive tracers models to simulate the transport and diffusion of particles moving with the ice. We discuss how these values are linked to the evolution of the fluctuating displacements variance and how this information could be used to define the size of the search area around the position predicted by the mean drift. By comparing observed and simulated sea-ice trajectories for three consecutive winter seasons (2007–2011), we show how the characteristics of the simulated motion may differ from or agree well with observations. This comparison illustrates the usefulness of first applying a diffusion analysis to evaluate the output of modeling systems that include a sea-ice model before using these in, e.g., oil spill trajectory models or, more generally, to simulate the transport of passive tracers in sea ice. © 2016 Author(s).
学科领域	accuracy assessment; buoy system; data buoy; data set; diffusion; Eulerian analysis; hydrological modeling; Lagrangian analysis; sea ice; tracer; trajectory; transport process; Arctic
语种	英语
scopus关键词	accuracy assessment; buoy system; data buoy; data set; diffusion; Eulerian analysis; hydrological modeling; Lagrangian analysis; sea ice; tracer; trajectory; transport process; Arctic
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/119616
作者单位	Nansen Environmental and Remote Sensing Center, Bjerknes Centre for Climate Research, Thormøhlens gate 47, Bergen, 5006, Norway
推荐引用方式 GB/T 7714	Rampal P.,Bouillon S.,Bergh J.,et al. Arctic sea-ice diffusion from observed and simulated Lagrangian trajectories[J],2016,10(4).
APA	Rampal P.,Bouillon S.,Bergh J.,&Ólason E..(2016).Arctic sea-ice diffusion from observed and simulated Lagrangian trajectories.Cryosphere,10(4).
MLA	Rampal P.,et al."Arctic sea-ice diffusion from observed and simulated Lagrangian trajectories".Cryosphere 10.4(2016).