Background nutrient concentration determines phytoplankton bloom response to marine heatwaves

© 2020 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 26(2020), 9 vom: 04. Sept., Seite 4800-4811
1. Verfasser: Hayashida, Hakase (VerfasserIn)
Weitere Verfasser: Matear, Richard J, Strutton, Peter G
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2020
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article biogeochemistry climate extreme marine heatwave model simulation oceanography phytoplankton satellite Chlorophyll A YF5Q9EJC8Y
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520 |a Ocean temperature extreme events such as marine heatwaves are expected to intensify in coming decades due to anthropogenic global warming. Reported ecological and economic impacts of marine heatwaves include coral bleaching, local extinction of mangrove and kelp forests and elevated mortalities of invertebrates, fishes, seabirds and marine mammals. In contrast, little is known about the impacts of marine heatwaves on microbes that regulate biogeochemical processes in the ocean. Here we analyse the daily output of a near-global ocean physical-biogeochemical model simulation to characterize the impacts of marine heatwaves on phytoplankton blooms in 23 tropical and temperate oceanographic regions from 1992 to 2014. The results reveal regionally coherent anomalies of shallower surface mixing layers and lower surface nitrate concentrations during marine heatwaves. These anomalies exert counteracting effects on phytoplankton growth through light and nutrient limitation. Consequently, the responses of phytoplankton blooms are mixed, but can be related to the background nutrient conditions of the study regions. The blooms are weaker during marine heatwaves in nutrient-poor waters, whereas in nutrient-rich waters, the heatwave blooms are stronger. The corresponding analyses of sea-surface temperature, chlorophyll a and nitrate based on satellite observations and in situ climatology support this relationship between phytoplankton bloom anomalies and background nitrate concentration. Given that nutrient-poor waters are projected to expand globally in the 21st century, this study suggests increased occurrence of weaker blooms during marine heatwaves in coming decades, with implications for higher trophic levels and biogeochemical cycling of key elements 
650 4 |a Journal Article 
650 4 |a biogeochemistry 
650 4 |a climate extreme 
650 4 |a marine heatwave 
650 4 |a model simulation 
650 4 |a oceanography 
650 4 |a phytoplankton 
650 4 |a satellite 
650 7 |a Chlorophyll A  |2 NLM 
650 7 |a YF5Q9EJC8Y  |2 NLM 
700 1 |a Matear, Richard J  |e verfasserin  |4 aut 
700 1 |a Strutton, Peter G  |e verfasserin  |4 aut 
773 0 8 |i Enthalten in  |t Global change biology  |d 1999  |g 26(2020), 9 vom: 04. Sept., Seite 4800-4811  |w (DE-627)NLM098239996  |x 1365-2486  |7 nnns 
773 1 8 |g volume:26  |g year:2020  |g number:9  |g day:04  |g month:09  |g pages:4800-4811 
856 4 0 |u http://dx.doi.org/10.1111/gcb.15255  |3 Volltext 
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