The University of Southampton
University of Southampton Institutional Repository

Episodic Southern Ocean heat loss and its mixed layer impacts revealed by the farthest south multiyear surface flux mooring

Episodic Southern Ocean heat loss and its mixed layer impacts revealed by the farthest south multiyear surface flux mooring
Episodic Southern Ocean heat loss and its mixed layer impacts revealed by the farthest south multiyear surface flux mooring
The Ocean Observatories Initiative air‐sea flux mooring deployed at 54.08°S, 89.67°W, in the southeast Pacific sector of the Southern Ocean, is the farthest south long‐term open ocean flux mooring ever deployed. Mooring observations (February 2015 to August 2017) provide the first in situ quantification of annual net air‐sea heat exchange from one of the prime Subantarctic Mode Water formation regions. Episodic turbulent heat loss events (reaching a daily mean net flux of −294 W/m2) generally occur when northeastward winds bring relatively cold, dry air to the mooring location, leading to large air‐sea temperature and humidity differences. Wintertime heat loss events promote deep mixed layer formation that lead to Subantarctic Mode Water formation. However, these processes have strong interannual variability; a higher frequency of 2 σ and 3 σ turbulent heat loss events in winter 2015 led to deep mixed layers (>300 m), which were nonexistent in winter 2016.
0094-8276
5002-5010
Ogle, S.E.
1ca0c83a-e7fa-4b41-ac19-bac8b8f28652
Tamsitt, V.
fa737975-f2bc-4e79-9994-6276f3d4f0f5
Josey, S.A.
2252ab7f-5cd2-49fd-a951-aece44553d93
Gille, S.T.
6685a419-8041-49eb-98e5-b54d7aef90ec
Cerovečki, I.
00643196-cb28-40fc-ab79-8d228fc18521
Talley, L.D.
45fc25e8-f845-42ac-804e-7052c8c16dcf
Weller, R.A.
27c97c11-3d05-4ac2-88c9-3ceaec7f7d2c
Ogle, S.E.
1ca0c83a-e7fa-4b41-ac19-bac8b8f28652
Tamsitt, V.
fa737975-f2bc-4e79-9994-6276f3d4f0f5
Josey, S.A.
2252ab7f-5cd2-49fd-a951-aece44553d93
Gille, S.T.
6685a419-8041-49eb-98e5-b54d7aef90ec
Cerovečki, I.
00643196-cb28-40fc-ab79-8d228fc18521
Talley, L.D.
45fc25e8-f845-42ac-804e-7052c8c16dcf
Weller, R.A.
27c97c11-3d05-4ac2-88c9-3ceaec7f7d2c

Ogle, S.E., Tamsitt, V., Josey, S.A., Gille, S.T., Cerovečki, I., Talley, L.D. and Weller, R.A. (2018) Episodic Southern Ocean heat loss and its mixed layer impacts revealed by the farthest south multiyear surface flux mooring. Geophysical Research Letters, 45 (10), 5002-5010. (doi:10.1029/2017GL076909).

Record type: Article

Abstract

The Ocean Observatories Initiative air‐sea flux mooring deployed at 54.08°S, 89.67°W, in the southeast Pacific sector of the Southern Ocean, is the farthest south long‐term open ocean flux mooring ever deployed. Mooring observations (February 2015 to August 2017) provide the first in situ quantification of annual net air‐sea heat exchange from one of the prime Subantarctic Mode Water formation regions. Episodic turbulent heat loss events (reaching a daily mean net flux of −294 W/m2) generally occur when northeastward winds bring relatively cold, dry air to the mooring location, leading to large air‐sea temperature and humidity differences. Wintertime heat loss events promote deep mixed layer formation that lead to Subantarctic Mode Water formation. However, these processes have strong interannual variability; a higher frequency of 2 σ and 3 σ turbulent heat loss events in winter 2015 led to deep mixed layers (>300 m), which were nonexistent in winter 2016.

Text
Ogle et al. 2018 - Accepted Manuscript
Download (1MB)
Text
Ogle_etal_supportinginformation - Accepted Manuscript
Download (1MB)

More information

Accepted/In Press date: 1 May 2018
e-pub ahead of print date: 11 May 2018
Published date: 28 May 2018

Identifiers

Local EPrints ID: 421864
URI: http://eprints.soton.ac.uk/id/eprint/421864
ISSN: 0094-8276
PURE UUID: 879ffd78-0d4c-406e-8b32-c48958adca04

Catalogue record

Date deposited: 03 Jul 2018 16:30
Last modified: 09 Jan 2022 07:14

Export record

Altmetrics

Contributors

Author: S.E. Ogle
Author: V. Tamsitt
Author: S.A. Josey
Author: S.T. Gille
Author: I. Cerovečki
Author: L.D. Talley
Author: R.A. Weller

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×