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Predominant atmospheric and oceanic patterns during coastal marine heatwaves


Schlegel, RW and Oliver, ECJ and Perkins-Kirkpatrick, S and Kruger, A and Smit, AJ, Predominant atmospheric and oceanic patterns during coastal marine heatwaves, Frontiers in Marine Science, 4, (OCT) Article 323. ISSN 2296-7745 (2017) [Refereed Article]


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Copyright 2017 The Authors Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.3389/fmars.2017.00323


As the mean temperatures of the worlds oceans increase, it is predicted that marine heatwaves (MHWs) will occur more frequently and with increased severity. However, it has been shown that variables other than increases in sea water temperature have been responsible for MHWs. To better understand these mechanisms driving MHWs we have utilized atmospheric (ERA-Interim) and oceanic (OISST, AVISO) data to examine the patterns around southern Africa during coastal (<400 m from the low water mark; measured in situ) MHWs. Nonmetric multidimensional scaling (NMDS) was first used to determine that the atmospheric and oceanic states during MHW are different from daily climatological states. Self-organizing maps (SOMs) were then used to cluster the MHW states into one of nine nodes to determine the predominant atmospheric and oceanic patterns present during these events. It was found that warm water forced onto the coast via anomalous ocean circulation was the predominant oceanic pattern during MHWs. Warm atmospheric temperatures over the subcontinent during onshore or alongshore winds were the most prominent atmospheric patterns. Roughly one third of the MHWs were clustered into a node with no clear patterns, which implied that they were not forced by a recurring atmospheric or oceanic state that could be described by the SOM analysis. Because warm atmospheric and/or oceanic temperature anomalies were not the only pattern associated with MHWs, the current trend of a warming earth does not necessarily mean that MHWs will increase apace; however, aseasonal variability in wind and current patterns was shown to be central to the formation of coastal MHWs, meaning that where climate systems shift from historic records, increases in MHWs will likely occur.

Item Details

Item Type:Refereed Article
Keywords:marine heatwaves, soms, code:R, coastal, atmosphere, ocean, in situ data, reanalysis data, climate change
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Climate variability (excl. social impacts)
UTAS Author:Oliver, ECJ (Dr Eric Oliver)
ID Code:122546
Year Published:2017
Web of Science® Times Cited:22
Deposited By:Oceans and Cryosphere
Deposited On:2017-11-17
Last Modified:2018-05-25
Downloads:164 View Download Statistics

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