Sensitivity of Marine Heatwave Metrics to Ocean Model Resolution

Date

2019

Authors

Pilo, Gabriela S.
Holbrook, Neil
Kiss, Andrew
Hogg, Andrew

Journal Title

Journal ISSN

Volume Title

Publisher

American Geophysical Union

Abstract

Sustained extreme temperature events in the ocean, referred to as marine heatwaves (MHWs), generate substantial ecological, social, and economic impacts. Ocean models provide insights to the drivers, persistence, and dissipation of MHWs. However, the sensitivity of MHW metrics to ocean model resolution is unknown. Here, we analyze global MHW metrics in three configurations of a global ocean-sea ice model at coarse (1◦), eddy-permitting (0.25◦), and eddy-rich (0.1◦) resolutions. We show that all configurations qualitatively represent broad-scale global patterns of MHWs. These simulated MHWs are, however, weaker, longer-lasting, and less frequent than in observations. The 0.1◦ configuration, despite local biases, performs best both globally and regionally. Based on these results, model projections of future MHW metrics using coarse-resolution models are expected to be biased toward weaker and less frequent MHWs, when compared with results using an eddy-rich model.

Description

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Citation

Source

Geophysical Research Letters

Type

Journal article

Book Title

Entity type

Access Statement

Open Access

License Rights

DOI

10.1029/2019GL084928

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