Publication Date:
2022-05-25
Description:
Author Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 44 (2017): 5637–5644, doi:10.1002/2017GL073585.
Description:
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.
Description:
National Oceanic and Atmospheric Administration, U.S. Department of Commerce Grant Number: NA14OAR4320106;
NSF Grant Numbers: OCE-1434041, OCE-1658079, PLR-1332911, OCE-1434041
Description:
2017-12-12
Keywords:
Iceberg
;
Melting
;
Greenland
;
Parameterization
Repository Name:
Woods Hole Open Access Server
Type:
Article
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