https://hdl.handle.net/20.500.12085/5b787903-35f4-4e7d-bc6b-e318b98d7f6d@metadata
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GEOMAR Helmholtz Centre for Ocean Research Kiel
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Supplementary data to Xue et al. (2021) "Mixed layer depth dominates over upwelling in regulating the seasonality of ecosystem functioning in the Peruvian Upwelling System" submitted to Biogeosciences
2022-01-28
publication
https://hdl.handle.net/20.500.12085/5b787903-35f4-4e7d-bc6b-e318b98d7f6d
Xue, Tianfei
https://orcid.org/0000-0003-4418-6989
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Frenger, Ivy
https://orcid.org/0000-0002-3490-7239
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Prowe, A. E. Friederike
https://orcid.org/0000-0001-5281-4696
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Jose, Yonss Saranga
https://orcid.org/0000-0001-5389-7884
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Oschlies, Andreas
https://orcid.org/0000-0002-8295-4013
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The Peruvian Upwelling System hosts an extremely high productive marine ecosystem. Observations show that the Peruvian Upwelling System is the only Eastern Boundary Upwelling Systems (EBUS) with an out-of-phase relationship of seasonal surface chlorophyll concentrations and upwelling intensity. This "seasonal paradox" triggers the questions: (1) what is the uniqueness of the Peruvian Upwelling System compared with other EBUS that leads to the out of phase relationship; (2) how does this uniqueness lead to low phytoplankton biomass in austral winter despite strong upwelling and ample nutrients? Using observational climatologies for four EBUS we diagnose that the Peruvian Upwelling System is unique in that intense upwelling coincides with deep mixed layers. We then apply a coupled regional ocean circulation-biogeochemical model (CROCO-BioEBUS) to assess how the interplay between mixed layer and upwelling is regulating the seasonality of surface chlorophyll in the Peruvian Upwelling System. The model recreates the "seasonal paradox" within 200âkm off the Peruvian coast. We confirm previous findings that deep mixed layers, which cause vertical dilution and stronger light limitation, mostly drive the diametrical seasonality of chlorophyll relative to upwelling. In contrast to previous studies, reduced phytoplankton growth due to enhanced upwelling of cold waters and lateral advection are second-order drivers of low surface chlorophyll concentrations. This impact of deep mixed layers and upwelling propagates up the ecosystem, from primary production to export efficiency. Our findings emphasize the crucial role of the interplay of the mixed layer and upwelling and suggest that surface chlorophyll may increase along with a weakened seasonal paradox in response to shoaling mixed layers under climate change.
GEOMAR Helmholtz Centre for Ocean Research Kiel
datamanagement@geomar.de
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croco
bioebus
peruvian upwelling system (pus)
marine ecosystem
eastern boundary upwelling systems (ebus)
Sea regions
GEMET - INSPIRE themes, version 1.0
GEMET
2008-06-01
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no limitations to public access
http://dx.doi.org/10.5194/bg-19-455-2022
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Humboldt Tipping
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CUSCO
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Opendap
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eng
oceans
geoscientificInformation
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https://hdl.handle.net/20.500.12085/5b787903-35f4-4e7d-bc6b-e318b98d7f6d
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series
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
2010-12-08
publication
false
Tianfei Xue, Ivy Frenger, A. E. Friederike Prowe, Yonss Saranga Jose, Andreas Oschlies, created the series.
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This metadata document contains metadata from the OAI EP3 export of https://oceanrep.geomar.de/id/eprint/52594. Data quality, in particular completeness, accuracy, precision, consistency and currentness have not been checked, yet.