Surface salinity under transitioning ice cover in the Canada Basin: Climate model biases linked to vertical distribution of fresh water
The Canada Basin has exhibited a significant trend toward a fresher surface layer and thus a more stratified upper-ocean over the past three decades. State-of-the-art ice-ocean models, by contrast, tend to simulate a surface layer that is saltier and less stratified than observed. Here, we examine d...
Main Authors: | , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union (AGU)
2021
|
Subjects: | |
Online Access: | https://discovery.ucl.ac.uk/id/eprint/10136804/8/Zhang_Geophysical%20Research%20Letters%20-%202021%20-%20Rosenblum%20-%20Surface%20Salinity%20Under%20Transitioning%20Ice%20Cover%20in%20the%20Canada%20Basin.pdf https://discovery.ucl.ac.uk/id/eprint/10136804/ |
id |
ftucl:oai:eprints.ucl.ac.uk.OAI2:10136804 |
---|---|
record_format |
openpolar |
spelling |
ftucl:oai:eprints.ucl.ac.uk.OAI2:10136804 2023-12-24T10:13:34+01:00 Surface salinity under transitioning ice cover in the Canada Basin: Climate model biases linked to vertical distribution of fresh water Rosenblum, E Fajber, R Stroeve, JC Gille, ST Tremblay, LB Carmack, EC 2021-11-16 text https://discovery.ucl.ac.uk/id/eprint/10136804/8/Zhang_Geophysical%20Research%20Letters%20-%202021%20-%20Rosenblum%20-%20Surface%20Salinity%20Under%20Transitioning%20Ice%20Cover%20in%20the%20Canada%20Basin.pdf https://discovery.ucl.ac.uk/id/eprint/10136804/ eng eng American Geophysical Union (AGU) https://discovery.ucl.ac.uk/id/eprint/10136804/8/Zhang_Geophysical%20Research%20Letters%20-%202021%20-%20Rosenblum%20-%20Surface%20Salinity%20Under%20Transitioning%20Ice%20Cover%20in%20the%20Canada%20Basin.pdf https://discovery.ucl.ac.uk/id/eprint/10136804/ open Geophysical Research Letters , 48 (21) , Article e2021GL094739. (2021) Canada Basin Arctic sea ice upper-ocean salinity CESM climate model freshwater Article 2021 ftucl 2023-11-27T13:07:30Z The Canada Basin has exhibited a significant trend toward a fresher surface layer and thus a more stratified upper-ocean over the past three decades. State-of-the-art ice-ocean models, by contrast, tend to simulate a surface layer that is saltier and less stratified than observed. Here, we examine decadal changes to seasonal processes that may contribute to this wide-reaching model bias using climate model simulations from the Community Earth System Model and below-ice observations from the Arctic Ice Dynamics Joint Experiment in 1975 and Ice Tethered Profilers in 2006-2012. In contrast to the observations, the models simulate salinity profiles that show relatively little variation between 1975 and 2012. We demonstrate that this bias can be mainly attributed to unrealistically deep vertical mixing in the model, creating a surface layer that is saltier than observed. The results provide insight for climate model improvement with broad implications for Arctic sea ice and ecosystem dynamics. Article in Journal/Newspaper Arctic canada basin Sea ice University College London: UCL Discovery Arctic Canada |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
topic |
Canada Basin Arctic sea ice upper-ocean salinity CESM climate model freshwater |
spellingShingle |
Canada Basin Arctic sea ice upper-ocean salinity CESM climate model freshwater Rosenblum, E Fajber, R Stroeve, JC Gille, ST Tremblay, LB Carmack, EC Surface salinity under transitioning ice cover in the Canada Basin: Climate model biases linked to vertical distribution of fresh water |
topic_facet |
Canada Basin Arctic sea ice upper-ocean salinity CESM climate model freshwater |
description |
The Canada Basin has exhibited a significant trend toward a fresher surface layer and thus a more stratified upper-ocean over the past three decades. State-of-the-art ice-ocean models, by contrast, tend to simulate a surface layer that is saltier and less stratified than observed. Here, we examine decadal changes to seasonal processes that may contribute to this wide-reaching model bias using climate model simulations from the Community Earth System Model and below-ice observations from the Arctic Ice Dynamics Joint Experiment in 1975 and Ice Tethered Profilers in 2006-2012. In contrast to the observations, the models simulate salinity profiles that show relatively little variation between 1975 and 2012. We demonstrate that this bias can be mainly attributed to unrealistically deep vertical mixing in the model, creating a surface layer that is saltier than observed. The results provide insight for climate model improvement with broad implications for Arctic sea ice and ecosystem dynamics. |
format |
Article in Journal/Newspaper |
author |
Rosenblum, E Fajber, R Stroeve, JC Gille, ST Tremblay, LB Carmack, EC |
author_facet |
Rosenblum, E Fajber, R Stroeve, JC Gille, ST Tremblay, LB Carmack, EC |
author_sort |
Rosenblum, E |
title |
Surface salinity under transitioning ice cover in the Canada Basin: Climate model biases linked to vertical distribution of fresh water |
title_short |
Surface salinity under transitioning ice cover in the Canada Basin: Climate model biases linked to vertical distribution of fresh water |
title_full |
Surface salinity under transitioning ice cover in the Canada Basin: Climate model biases linked to vertical distribution of fresh water |
title_fullStr |
Surface salinity under transitioning ice cover in the Canada Basin: Climate model biases linked to vertical distribution of fresh water |
title_full_unstemmed |
Surface salinity under transitioning ice cover in the Canada Basin: Climate model biases linked to vertical distribution of fresh water |
title_sort |
surface salinity under transitioning ice cover in the canada basin: climate model biases linked to vertical distribution of fresh water |
publisher |
American Geophysical Union (AGU) |
publishDate |
2021 |
url |
https://discovery.ucl.ac.uk/id/eprint/10136804/8/Zhang_Geophysical%20Research%20Letters%20-%202021%20-%20Rosenblum%20-%20Surface%20Salinity%20Under%20Transitioning%20Ice%20Cover%20in%20the%20Canada%20Basin.pdf https://discovery.ucl.ac.uk/id/eprint/10136804/ |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic canada basin Sea ice |
genre_facet |
Arctic canada basin Sea ice |
op_source |
Geophysical Research Letters , 48 (21) , Article e2021GL094739. (2021) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/10136804/8/Zhang_Geophysical%20Research%20Letters%20-%202021%20-%20Rosenblum%20-%20Surface%20Salinity%20Under%20Transitioning%20Ice%20Cover%20in%20the%20Canada%20Basin.pdf https://discovery.ucl.ac.uk/id/eprint/10136804/ |
op_rights |
open |
_version_ |
1786183923785531392 |