Mixed Layer Depth Promotes Trophic Amplification on a Seasonal Scale

Xue, Tianfei; Frenger, Ivy; Oschlies, Andreas; Stock, Charles A.; Koeve, Wolfgang; John, Jasmin G.; Prowe, A. E. Friederike

doi:10.1029/2022GL098720

i

Mixed Layer Depth Promotes Trophic Amplification on a Seasonal Scale

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2022
By Xue, Tianfei ; Frenger, Ivy ; Oschlies, Andreas ; ...

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Journal Title:

Geophysical Research Letters
Personal Author:

Xue, Tianfei ; Frenger, Ivy ; Oschlies, Andreas ; Stock, Charles A. ; Koeve, Wolfgang ; John, Jasmin G. ; Prowe, A. E. Friederike
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) ; AOML (Atlantic Oceanographic and Meteorological Laboratory)
Description:

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.
Keywords:

Food Chains (Ecology) Peru Current Upwelling (Oceanography) Food Chains (Ecology)
Source:

Geophysical Research Letters, 49, e2022GL098720
DOI:

https://doi.org/10.1029/2022GL098720
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by-nc/4.0/
Rights Information:

CC BY-NC
Compliance:

Submitted
Main Document Checksum:

urn:sha256:a69f18d1ca9595fd099dfcc2d7c1acce84b0f2c38b8d5e491cc9f9e70bed9a4e
Download URL:

https://repository.library.noaa.gov/view/noaa/45440/noaa_45440_DS1.pdf
File Type:

[PDF - 1.93 MB ]

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