Mixed Layer Depth Promotes Trophic Amplification on a Seasonal Scale
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,...
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| Format: | Article |
| Language: | English |
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Wiley
2022-06-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2022GL098720 |
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| author | Tianfei Xue Ivy Frenger Andreas Oschlies Charles A. Stock Wolfgang Koeve Jasmin G. John A. E. Friederike Prowe |
| author_facet | Tianfei Xue Ivy Frenger Andreas Oschlies Charles A. Stock Wolfgang Koeve Jasmin G. John A. E. Friederike Prowe |
| author_sort | Tianfei Xue |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-9c58732159524bc0aed0614764fd8ef1 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2022-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-9c58732159524bc0aed0614764fd8ef12025-01-22T14:38:16ZengWileyGeophysical Research Letters0094-82761944-80072022-06-014912n/an/a10.1029/2022GL098720Mixed Layer Depth Promotes Trophic Amplification on a Seasonal ScaleTianfei Xue0Ivy Frenger1Andreas Oschlies2Charles A. Stock3Wolfgang Koeve4Jasmin G. John5A. E. Friederike Prowe6GEOMAR Helmholtz Centre for Ocean Research Kiel Kiel GermanyGEOMAR Helmholtz Centre for Ocean Research Kiel Kiel GermanyGEOMAR Helmholtz Centre for Ocean Research Kiel Kiel GermanyNOAA Geophysical Fluid Dynamics Laboratory Princeton University Princeton NJ USAGEOMAR Helmholtz Centre for Ocean Research Kiel Kiel GermanyNOAA Geophysical Fluid Dynamics Laboratory Princeton University Princeton NJ USAGEOMAR Helmholtz Centre for Ocean Research Kiel Kiel GermanyAbstract 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.https://doi.org/10.1029/2022GL098720mixed layer depthseasonal trophic amplificationtrophic transfer efficiencyfood chain lengthHumboldt systemproductive region |
| spellingShingle | Tianfei Xue Ivy Frenger Andreas Oschlies Charles A. Stock Wolfgang Koeve Jasmin G. John A. E. Friederike Prowe Mixed Layer Depth Promotes Trophic Amplification on a Seasonal Scale Geophysical Research Letters mixed layer depth seasonal trophic amplification trophic transfer efficiency food chain length Humboldt system productive region |
| title | Mixed Layer Depth Promotes Trophic Amplification on a Seasonal Scale |
| title_full | Mixed Layer Depth Promotes Trophic Amplification on a Seasonal Scale |
| title_fullStr | Mixed Layer Depth Promotes Trophic Amplification on a Seasonal Scale |
| title_full_unstemmed | Mixed Layer Depth Promotes Trophic Amplification on a Seasonal Scale |
| title_short | Mixed Layer Depth Promotes Trophic Amplification on a Seasonal Scale |
| title_sort | mixed layer depth promotes trophic amplification on a seasonal scale |
| topic | mixed layer depth seasonal trophic amplification trophic transfer efficiency food chain length Humboldt system productive region |
| url | https://doi.org/10.1029/2022GL098720 |
| work_keys_str_mv | AT tianfeixue mixedlayerdepthpromotestrophicamplificationonaseasonalscale AT ivyfrenger mixedlayerdepthpromotestrophicamplificationonaseasonalscale AT andreasoschlies mixedlayerdepthpromotestrophicamplificationonaseasonalscale AT charlesastock mixedlayerdepthpromotestrophicamplificationonaseasonalscale AT wolfgangkoeve mixedlayerdepthpromotestrophicamplificationonaseasonalscale AT jasmingjohn mixedlayerdepthpromotestrophicamplificationonaseasonalscale AT aefriederikeprowe mixedlayerdepthpromotestrophicamplificationonaseasonalscale |