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Optimizing mooring placement to constrain southern ocean air-sea fluxes

Citation

Wei, Y and Gille, ST and Mazloff, MR and Tamsitt, V and Swart, S and Chen, D and Newman, L, Optimizing mooring placement to constrain southern ocean air-sea fluxes, Journal of Atmospheric and Oceanic Technology, 37, (8) pp. 1365-1385. ISSN 0739-0572 (2020) [Refereed Article]


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DOI: doi:10.1175/JTECH-D-19-0203.1

Abstract

Proposals from multiple nations to deploy air–sea flux moorings in the Southern Ocean have raised the question of how to optimize the placement of these moorings in order to maximize their utility, both as contributors to the network of observations assimilated in numerical weather prediction and also as a means to study a broad range of processes driving air–sea fluxes. This study, developed as a contribution to the Southern Ocean Observing System (SOOS), proposes criteria that can be used to determine mooring siting to obtain best estimates of net air–sea heat flux (Qnet). Flux moorings are envisioned as one component of a multiplatform observing system, providing valuable in situ point time series measurements to be used alongside satellite data and observations from autonomous platforms and ships. Assimilating models (e.g., numerical weather prediction and reanalysis products) then offer the ability to synthesize the observing system and map properties between observations. This paper develops a framework for designing mooring array configurations to maximize the independence and utility of observations. As a test case, within the meridional band from 35° to 65°S we select eight mooring sites optimized to explain the largest fraction of the total variance (and thus to ensure the least variance of residual components) in the area south of 20°S. Results yield different optimal mooring sites for low-frequency interannual heat fluxes compared with higher-frequency subseasonal fluxes. With eight moorings, we could explain a maximum of 24.6% of high-frequency Qnet variability or 44.7% of low-frequency Qnet variability.

Item Details

Item Type:Refereed Article
Keywords:Southern Ocean, moorings, observing system, fluxes
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Antarctic and Southern Ocean oceanic processes
UTAS Author:Newman, L (Dr Louise Newman)
ID Code:142930
Year Published:2020
Web of Science® Times Cited:1
Deposited By:Oceans and Cryosphere
Deposited On:2021-02-16
Last Modified:2021-03-01
Downloads:0

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