Drivers and impacts of the most extreme marine heatwave events

SenGupta, A; Hobday, AJ; Oliver, E; Alexander, LV; Donat, MG; Feng, M; Holbrook, NJ; Moore, PJ; Rodrigues, RR; Smale et al, DA. 2020 Drivers and impacts of the most extreme marine heatwave events. Scientific Reports, 10, 19359. https://doi.org/10.1038/s41598-020-75445-3

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Official URL: https://www.nature.com/articles/s41598-020-75445-3

Abstract/Summary

Prolonged high-temperature extreme events in the ocean, marine heatwaves, can have severe and long-lasting impacts on marine ecosystems, fisheries and associated services. This study applies a marine heatwave framework to analyse a global sea surface temperature product and identify the most extreme events, based on their intensity, duration and spatial extent. Many of these events have yet to be described in terms of their physical attributes, generation mechanisms, or ecological impacts. Our synthesis identifies commonalities between marine heatwave characteristics and seasonality, links to the El Niño-Southern Oscillation, triggering processes and impacts on ocean productivity. The most intense events preferentially occur in summer, when climatological oceanic mixed layers are shallow and winds are weak, but at a time preceding climatological maximum sea surface temperatures. Most subtropical extreme marine heatwaves were triggered by persistent atmospheric high-pressure systems and anomalously weak wind speeds, associated with increased insolation, and reduced ocean heat losses. Furthermore, the most extreme events tended to coincide with reduced chlorophyll-a concentration at low and mid-latitudes. Understanding the importance of the oceanic background state, local and remote drivers and the ocean productivity response from past events are critical steps toward improving predictions of future marine heatwaves and their impacts

Item Type: Publication - Article
Additional Keywords: Climate Science, Marine biology, Physical oceanography
Subjects: Marine Sciences
Divisions: Marine Biological Association of the UK > Ecosystems and Environmental Change > Global environmental change and marine ecosystems
Depositing User: Emily Smart
Date made live: 03 Sep 2021 10:42
Last Modified: 03 Sep 2021 10:42
URI: http://plymsea.ac.uk/id/eprint/9341

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