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Air-sea interaction regimes in the sub-Antarctic Southern Ocean and Antarctic marginal ice zone revealed by icebreaker measurements

Air-sea interaction regimes in the sub-Antarctic Southern Ocean and Antarctic marginal ice zone revealed by icebreaker measurements
Air-sea interaction regimes in the sub-Antarctic Southern Ocean and Antarctic marginal ice zone revealed by icebreaker measurements
This study analyzed shipboard air-sea measurements acquired by the icebreaker Aurora Australis during its off-winter operation in December 2010 to May 2012. Mean conditions over 7 months (October–April) were compiled from a total of 22 ship tracks. The icebreaker traversed the water between Hobart, Tasmania, and the Antarctic continent, providing valuable in situ insight into two dynamically important, yet poorly sampled, regimes: the sub-Antarctic Southern Ocean and the Antarctic marginal ice zone (MIZ) in the Indian Ocean sector. The transition from the open water to the ice-covered surface creates sharp changes in albedo, surface roughness, and air temperature, leading to consequential effects on air-sea variables and fluxes. Major effort was made to estimate the air-sea fluxes in the MIZ using the bulk flux algorithms that are tuned specifically for the sea-ice effects, while computing the fluxes over the sub-Antarctic section using the COARE3.0 algorithm. The study evidenced strong sea-ice modulations on winds, with the southerly airflow showing deceleration (convergence) in the MIZ and acceleration (divergence) when moving away from the MIZ. Marked seasonal variations in heat exchanges between the atmosphere and the ice margin were noted. The monotonic increase in turbulent latent and sensible heat fluxes after summer turned the MIZ quickly into a heat loss regime, while at the same time the sub-Antarctic surface water continued to receive heat from the atmosphere. The drastic increase in turbulent heat loss in the MIZ contrasted sharply to the nonsignificant and seasonally invariant turbulent heat loss over the sub-Antarctic open water.
2169-9275
6547-6564
Yu, Lisan
24f3c81a-031c-4333-afb8-3030f94858ec
Jin, Xiangze
2011df12-b913-4289-80e2-cac1f1adcfcd
Schulz, Eric W.
14ad6bfd-adb7-4cb4-9551-fa0f323aa6e5
Josey, Simon A.
2252ab7f-5cd2-49fd-a951-aece44553d93
Yu, Lisan
24f3c81a-031c-4333-afb8-3030f94858ec
Jin, Xiangze
2011df12-b913-4289-80e2-cac1f1adcfcd
Schulz, Eric W.
14ad6bfd-adb7-4cb4-9551-fa0f323aa6e5
Josey, Simon A.
2252ab7f-5cd2-49fd-a951-aece44553d93

Yu, Lisan, Jin, Xiangze, Schulz, Eric W. and Josey, Simon A. (2017) Air-sea interaction regimes in the sub-Antarctic Southern Ocean and Antarctic marginal ice zone revealed by icebreaker measurements. Journal of Geophysical Research: Oceans, 122 (8), 6547-6564. (doi:10.1002/2016JC012281).

Record type: Article

Abstract

This study analyzed shipboard air-sea measurements acquired by the icebreaker Aurora Australis during its off-winter operation in December 2010 to May 2012. Mean conditions over 7 months (October–April) were compiled from a total of 22 ship tracks. The icebreaker traversed the water between Hobart, Tasmania, and the Antarctic continent, providing valuable in situ insight into two dynamically important, yet poorly sampled, regimes: the sub-Antarctic Southern Ocean and the Antarctic marginal ice zone (MIZ) in the Indian Ocean sector. The transition from the open water to the ice-covered surface creates sharp changes in albedo, surface roughness, and air temperature, leading to consequential effects on air-sea variables and fluxes. Major effort was made to estimate the air-sea fluxes in the MIZ using the bulk flux algorithms that are tuned specifically for the sea-ice effects, while computing the fluxes over the sub-Antarctic section using the COARE3.0 algorithm. The study evidenced strong sea-ice modulations on winds, with the southerly airflow showing deceleration (convergence) in the MIZ and acceleration (divergence) when moving away from the MIZ. Marked seasonal variations in heat exchanges between the atmosphere and the ice margin were noted. The monotonic increase in turbulent latent and sensible heat fluxes after summer turned the MIZ quickly into a heat loss regime, while at the same time the sub-Antarctic surface water continued to receive heat from the atmosphere. The drastic increase in turbulent heat loss in the MIZ contrasted sharply to the nonsignificant and seasonally invariant turbulent heat loss over the sub-Antarctic open water.

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More information

Accepted/In Press date: 20 June 2017
e-pub ahead of print date: 23 August 2017
Published date: August 2017

Identifiers

Local EPrints ID: 418640
URI: http://eprints.soton.ac.uk/id/eprint/418640
ISSN: 2169-9275
PURE UUID: a7ed3284-e51a-4335-8b49-9841bf0cd6f1

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Date deposited: 13 Mar 2018 17:30
Last modified: 27 Apr 2022 12:23

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Contributors

Author: Lisan Yu
Author: Xiangze Jin
Author: Eric W. Schulz
Author: Simon A. Josey

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