Nonlinear response of iceberg side melting to ocean currents
Nonlinear response of iceberg side melting to ocean currents
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DOI：
10.1002/2017gl073585
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发表时间：
2017-06-16
影响因子：
5.2
通讯作者：
Straneo, F.
中科院分区：
文献类型：
--
作者：
FitzMaurice, A.;Cenedese, C.;Straneo, F.
冰山崩解到格陵兰峡湾经常经历强烈剪切流超过其草案，但这种流动过去的冰山的影响是不完全捕获现有的参数化。我们提出了一系列新颖的实验室实验，以确定潜艇融化的依赖沿着冰山两侧的背景流。我们表明，第一次，存在两个不同的制度的融化取决于流量大小和随之而来的行为的熔体羽流（侧连接或侧分离），相应地不同的融水扩散特性。当这种速度的依赖性包括在融化参数化，融化率估计所观察到的冰山在所附制度增加，与所观察到的冰山潜艇融化率一致。我们表明，无论是附着和分离羽制度相关的冰山在格陵兰峡湾观察。此外，根据不同的制度，冰山融水可能局限于表层或分布在冰山草案。
Icebergs calving into Greenlandic Fjords frequently experience strongly sheared flows over their draft, but the impact of this flow past the iceberg is not fully captured by existing parameterizations. We present a series of novel laboratory experiments to determine the dependence of submarine melting along iceberg sides on a background flow. We show, for the first time, that two distinct regimes of melting exist depending on the flow magnitude and consequent behavior of melt plumes (side-attached or side-detached), with correspondingly different meltwater spreading characteristics. When this velocity dependence is included in melt parameterizations, melt rates estimated for observed icebergs in the attached regime increase, consistent with observed iceberg submarine melt rates. We show that both attached and detached plume regimes are relevant to icebergs observed in a Greenland fjord. Further, depending on the regime, iceberg meltwater may either be confined to a surface layer or distributed over the iceberg draft.