Mixed Layer Depth Promotes Trophic Amplification on a Seasonal Scale.

Xue, Tianfei , Frenger, Ivy , Oschlies, Andreas , Stock, Charles A., Koeve, Wolfgang , John, Jasmin G. and Prowe, A. E. Friederike (2022) Mixed Layer Depth Promotes Trophic Amplification on a Seasonal Scale. Open Access Geophysical Research Letters, 49 (12). Art.Nr. e2022GL098720. DOI 10.1029/2022GL098720.

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Abstract

The Humboldt Upwelling System is of global interest due to its importance to fisheries, though the origin of its high productivity remains elusive. In regional physical-biogeochemical model simulations, the seasonal amplitude of mesozooplankton net production exceeds that of phytoplankton, indicating “seasonal trophic amplification.” An analytical approach identifies amplification to be driven by a seasonally varying trophic transfer efficiency due to mixed layer variations. The latter alters the vertical distribution of phytoplankton and thus the zooplankton and phytoplankton encounters, with lower encounters occurring in a deeper mixed layer where phytoplankton are diluted. In global model simulations, mixed layer depth appears to affect trophic transfer similarly in other productive regions. Our results highlight the importance of mixed layer depth for trophodynamics on a seasonal scale with potential significant implications, given mixed layer depth changes projected under climate change.

Document Type: Article
Funder compliance: BMBF: 03F0813A ; BMBF: 01LC1823B
Keywords: phytoplankton; global warming; Humboldt system
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
Main POF Topic: PT6: Marine Life
Refereed: Yes
Open Access Journal?: No
Publisher: AGU (American Geophysical Union), Wiley
Related URLs:
Projects: CUSCO, Humboldt Tipping
Date Deposited: 17 Jun 2022 07:44
Last Modified: 07 Feb 2024 15:25
URI: https://oceanrep.geomar.de/id/eprint/56360

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