Nonlinear influence of the Earth's rotation on iceberg melting
The calving of icebergs accounts for a significant fraction of the mass loss from both the Antarctic and Greenland ice sheets. Iceberg melting affects the water properties impacting sea ice formation, local circulation and biological activity. Laboratory experiments have investigated the effects of...
Published in: | Journal of Fluid Mechanics |
---|---|
Main Authors: | , , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press
2019
|
Subjects: | |
Online Access: | https://hdl.handle.net/10281/467680 https://doi.org/10.1017/jfm.2018.798 |
id |
ftunivmilanobic:oai:boa.unimib.it:10281/467680 |
---|---|
record_format |
openpolar |
spelling |
ftunivmilanobic:oai:boa.unimib.it:10281/467680 2024-04-21T07:49:16+00:00 Nonlinear influence of the Earth's rotation on iceberg melting Meroni A. N. McConnochie C. D. Cenedese C. Sutherland B. Snow K. Meroni, A Mcconnochie, C Cenedese, C Sutherland, B Snow, K 2019 STAMPA https://hdl.handle.net/10281/467680 https://doi.org/10.1017/jfm.2018.798 eng eng Cambridge University Press country:GB info:eu-repo/semantics/altIdentifier/wos/WOS:000526777100031 volume:858 firstpage:832 lastpage:851 numberofpages:20 journal:JOURNAL OF FLUID MECHANICS https://hdl.handle.net/10281/467680 doi:10.1017/jfm.2018.798 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85056800306 phase change rotating flow solidification/melting GEO/12 - OCEANOGRAFIA E FISICA DELL'ATMOSFERA info:eu-repo/semantics/article 2019 ftunivmilanobic https://doi.org/10.1017/jfm.2018.798 2024-03-28T00:59:39Z The calving of icebergs accounts for a significant fraction of the mass loss from both the Antarctic and Greenland ice sheets. Iceberg melting affects the water properties impacting sea ice formation, local circulation and biological activity. Laboratory experiments have investigated the effects of the Earth's rotation on iceberg melting and the possible formation of Taylor columns (TCs) underneath icebergs. It is found that at high Rossby number, , when rotation is weak compared to advection, iceberg melting is unaffected by the background rotation. As decreases, the melt rate shows an increasing trend, which is expected to reverse for very low . This behaviour is explained by considering the integrated horizontal velocity at the base of the iceberg. For moderate Ro, a partial TC is formed and its effective blocking accelerates the flow under the remainder of the iceberg, which increases the melt rate since the melting is proportional to the flow velocity. It is expected that for very low the melt rate decreases because, with the expansion of the TC, the region of flow acceleration occurs away from the base of the iceberg. For low free stream velocity the freshwater produced by the ice melting introduces another dynamical effect. It is observed that there is a threshold free stream velocity below which the melt rate is constant. This is explained with the formation of a gravity current at the base of the iceberg that insulates it from the free flow and controls its melting. Article in Journal/Newspaper Antarc* Antarctic Greenland Iceberg* Sea ice Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) Journal of Fluid Mechanics 858 832 851 |
institution |
Open Polar |
collection |
Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) |
op_collection_id |
ftunivmilanobic |
language |
English |
topic |
phase change rotating flow solidification/melting GEO/12 - OCEANOGRAFIA E FISICA DELL'ATMOSFERA |
spellingShingle |
phase change rotating flow solidification/melting GEO/12 - OCEANOGRAFIA E FISICA DELL'ATMOSFERA Meroni A. N. McConnochie C. D. Cenedese C. Sutherland B. Snow K. Nonlinear influence of the Earth's rotation on iceberg melting |
topic_facet |
phase change rotating flow solidification/melting GEO/12 - OCEANOGRAFIA E FISICA DELL'ATMOSFERA |
description |
The calving of icebergs accounts for a significant fraction of the mass loss from both the Antarctic and Greenland ice sheets. Iceberg melting affects the water properties impacting sea ice formation, local circulation and biological activity. Laboratory experiments have investigated the effects of the Earth's rotation on iceberg melting and the possible formation of Taylor columns (TCs) underneath icebergs. It is found that at high Rossby number, , when rotation is weak compared to advection, iceberg melting is unaffected by the background rotation. As decreases, the melt rate shows an increasing trend, which is expected to reverse for very low . This behaviour is explained by considering the integrated horizontal velocity at the base of the iceberg. For moderate Ro, a partial TC is formed and its effective blocking accelerates the flow under the remainder of the iceberg, which increases the melt rate since the melting is proportional to the flow velocity. It is expected that for very low the melt rate decreases because, with the expansion of the TC, the region of flow acceleration occurs away from the base of the iceberg. For low free stream velocity the freshwater produced by the ice melting introduces another dynamical effect. It is observed that there is a threshold free stream velocity below which the melt rate is constant. This is explained with the formation of a gravity current at the base of the iceberg that insulates it from the free flow and controls its melting. |
author2 |
Meroni, A Mcconnochie, C Cenedese, C Sutherland, B Snow, K |
format |
Article in Journal/Newspaper |
author |
Meroni A. N. McConnochie C. D. Cenedese C. Sutherland B. Snow K. |
author_facet |
Meroni A. N. McConnochie C. D. Cenedese C. Sutherland B. Snow K. |
author_sort |
Meroni A. N. |
title |
Nonlinear influence of the Earth's rotation on iceberg melting |
title_short |
Nonlinear influence of the Earth's rotation on iceberg melting |
title_full |
Nonlinear influence of the Earth's rotation on iceberg melting |
title_fullStr |
Nonlinear influence of the Earth's rotation on iceberg melting |
title_full_unstemmed |
Nonlinear influence of the Earth's rotation on iceberg melting |
title_sort |
nonlinear influence of the earth's rotation on iceberg melting |
publisher |
Cambridge University Press |
publishDate |
2019 |
url |
https://hdl.handle.net/10281/467680 https://doi.org/10.1017/jfm.2018.798 |
genre |
Antarc* Antarctic Greenland Iceberg* Sea ice |
genre_facet |
Antarc* Antarctic Greenland Iceberg* Sea ice |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000526777100031 volume:858 firstpage:832 lastpage:851 numberofpages:20 journal:JOURNAL OF FLUID MECHANICS https://hdl.handle.net/10281/467680 doi:10.1017/jfm.2018.798 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85056800306 |
op_doi |
https://doi.org/10.1017/jfm.2018.798 |
container_title |
Journal of Fluid Mechanics |
container_volume |
858 |
container_start_page |
832 |
op_container_end_page |
851 |
_version_ |
1796931753553690624 |