Hotspots and drivers of compound marine heatwaves and low net primary production extremes

Abstract - 1 - 1 ∘  S, low agreement between the observation-based estimates makes it difficult to determine which of the two models better simulates MHW–NPPX events. The frequency patterns can be explained by the drivers of compound events, which vary among the two models and phytoplankton types. In the low latitudes, MHWs are associated with enhanced nutrient limitation on phytoplankton growth, which results in frequent compound MHW–NPPX events in both models. In the high latitudes, NPPX events in GFDL ESM2M-LE are driven by enhanced light limitation, which rarely co-occurs with MHWs, resulting in rare compound events. In contrast, in CESM2-LE, NPPX events in the high latitudes are driven by reduced nutrient supply that often co-occurs with MHWs, moderates phytoplankton growth, and causes biomass to decrease. Compound MHW–NPPX events are associated with a relative shift towards larger phytoplankton in most regions, except in the eastern equatorial Pacific in both models, as well as in the northern high latitudes and between 35 and 50∘  S in CESM2-LE, where the models suggest a shift towards smaller phytoplankton, with potential repercussions on marine ecosystems. Overall, our analysis reveals that the likelihood of compound MHW–NPPX events is contingent on model representation of the factors limiting phytoplankton production. This identifies an important need for improved process understanding in Earth system models used for predicting and projecting compound MHW–NPPX events and their impacts.

Angaben zum Objekt

• Standort: Deutsche Nationalbibliothek Frankfurt am Main
• Umfang: Online-Ressource
• Sprache: Englisch

Verweise und Beziehungen

• Erschienen in: Hotspots and drivers of compound marine heatwaves and low net primary production extremes ; volume:19 ; number:24 ; year:2022 ; pages:5807-5835 ; extent:29 ; Biogeosciences ; 19, Heft 24 (2022), 5807-5835 (gesamt 29)

Beteiligte, Orts- und Zeitangaben

• Urheber: Le Grix, Natacha ; Zscheischler, Jakob ; Rodgers, Keith B. ; Yamaguchi, Ryohei ; Frölicher, Thomas L.

Weitere Informationen

• DOI: 10.5194/bg-19-5807-2022
• URN: urn:nbn:de:101:1-2022122204295779203804
• Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Letzte Aktualisierung: 15.08.2025, 07:37 MESZ