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DOI	10.5194/tc-12-2267-2018
	Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data
	Bouhier N.; Tournadre J.; Rémy F.; Gourves-Cousin R.
发表日期	2018
ISSN	19940416
卷号	12 期号:7
英文摘要	The evolution of the thickness and area of two large Southern Ocean icebergs that have drifted in open water for more than a year is estimated through the combined analysis of altimeter data and visible satellite images. The observed thickness evolution is compared with iceberg melting predictions from two commonly used melting formulations, allowing us to test their validity for large icebergs. The first formulation, based on a fluid dynamics approach, tends to underestimate basal melt rates, while the second formulation, which considers the thermodynamic budget, appears more consistent with observations. Fragmentation is more important than melting for the decay of large icebergs. Despite its importance, fragmentation remains poorly documented. The correlation between the observed volume loss of our two icebergs and environmental parameters highlights factors most likely to promote fragmentation. Using this information, a bulk model of fragmentation is established that depends on ocean temperature and iceberg velocity. The model is effective at reproducing observed volume variations. The size distribution of the calved pieces is estimated using both altimeter data and visible images and is found to be consistent with previous results and typical of brittle fragmentation processes. These results are valuable in accounting for the freshwater flux constrained by large icebergs in models. © Author(s) 2018.
学科领域	altimeter; basal melting; estimation method; fragmentation; hydrological modeling; ice thickness; iceberg; iceberg calving; image analysis; melting; satellite data; size distribution; thermodynamics; water temperature; Southern Ocean
语种	英语
scopus关键词	altimeter; basal melting; estimation method; fragmentation; hydrological modeling; ice thickness; iceberg; iceberg calving; image analysis; melting; satellite data; size distribution; thermodynamics; water temperature; Southern Ocean
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/119106
作者单位	Laboratoire d'Océanographie Physique et Spatiale, IFREMER, CNRS, IRD, Université Bretagne-Loire, Plouzané, France; Laboratoire d'Etudes en Géophysique et Océanographie Spatiales, UMR 5566, CNES-CNRS, Toulouse, France
推荐引用方式 GB/T 7714	Bouhier N.,Tournadre J.,Rémy F.,et al. Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data[J],2018,12(7).
APA	Bouhier N.,Tournadre J.,Rémy F.,&Gourves-Cousin R..(2018).Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data.Cryosphere,12(7).
MLA	Bouhier N.,et al."Melting and fragmentation laws from the evolution of two large Southern Ocean icebergs estimated from satellite data".Cryosphere 12.7(2018).