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| Fearon, Giles; Herbette, Steven; Veitch, Jennifer; Cambon, Gildas; Lucas, Andrew J.; Lemarié, Florian; Vichi, Marcello. |
| The land‐sea breeze is resonant with the inertial response of the ocean at the critical latitude of 30°N/S. 1D‐vertical numerical experiments were undertaken to study the key drivers of enhanced diapycnal mixing in coastal upwelling systems driven by diurnal‐inertial resonance near the critical latitude. The effect of the land boundary was implicitly included in the model through the `Craig approximation' for first order cross‐shore surface elevation gradient response. The model indicates that for shallow water depths (<~100~m), bottom shear stresses must be accounted for in the formulation of the ‘Craig approximation’, as they serve to enhance the cross‐shore surface elevation gradient response, while reducing shear and mixing at the thermocline. The... |
| Tipo: Text |
Palavras-chave: Inertial oscillations<; /AUTHOR_KEYWORD>; Land-sea breeze<; /AUTHOR_KEYWORD>; Diurnal-inertial resonance<; /AUTHOR_KEYWORD>; Coastal upwelling<; /AUTHOR_KEYWORD>; Diapycnal mixing<; /AUTHOR_KEYWORD>; Phytoplankton blooms<; /AUTHOR_KEYWORD>. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00643/75507/76384.pdf |
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| Black, Ee; Kienast, Ss; Lemaitre, N; Lam, Pj; Anderson, Rf; Planquette, Helene; Planchon, Frederic; Buesseler, Ko. |
| Although iron availability has been shown to limit ocean productivity and influence marine carbon cycling, the rates of processes driving iron's removal and retention in the upper ocean are poorly constrained. Using 234Th‐ and sediment‐trap data, most of which were collected through international GEOTRACES efforts, we perform an unprecedented observation‐based assessment of iron export from and residence time in the upper ocean. The majority of these new residence time estimates for total iron in the surface ocean (0‐250 m) fall between 10 and 100 days. The upper ocean residence time of dissolved iron, on the other hand, varies and cycles on sub‐annual to annual timescales. Collectively, these residence times are shorter than previously thought, and the... |
| Tipo: Text |
Palavras-chave: Thorium-234<; /AUTHOR_KEYWORD>; Iron<; /AUTHOR_KEYWORD>; Export<; /AUTHOR_KEYWORD>; GEOTRACES<; /AUTHOR_KEYWORD>; Residence time<; /AUTHOR_KEYWORD>. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00644/75632/76493.pdf |
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| Yu, Zhaojie; Colin, Christophe; Bassinot, Franck; Wan, Shiming; Bayon, Germain. |
| Chemical weathering of silicate rocks on continents is thought to have played an important role in the evolution of past atmospheric carbon dioxide over geologic timescales. However, the detailed links between continental weathering and climate change over shorter timescales, and their potential impact on sediment records deposited in the ocean, remain poorly understood. Here, we present clay mineralogy and strontium‐neodymium isotopic data for marine sediment records from the Northern Indian Ocean, with the aim of investigating the weathering response of large Himalayan river basins to orbital and millennial climate forcing. We show that past glaciated episodes of the late Quaternary corresponded to periods of increased physical erosion, associated with... |
| Tipo: Text |
Palavras-chave: Climate change<; /AUTHOR_KEYWORD>; Continental weathering<; /AUTHOR_KEYWORD>; Highlands and floodplains<; /AUTHOR_KEYWORD>; Carbon cycle<; /AUTHOR_KEYWORD>; Himalaya<; /AUTHOR_KEYWORD>. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00632/74434/74154.pdf |
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| Su, Zhan; Torres, Hector; Klein, Patrice; Thompson, Andrew F; Siegelman, Lia; Wang, Jinbo; Menemenlis, Dimitris; Hill, Christopher. |
| he rate of ocean heat uptake depends on the mechanisms that transport heat between the surface and the ocean interior. A recent study found that the vertical heat transport driven by motions with scales smaller than 50 km (submesoscales) and frequencies smaller than one day‐1 is upward. This transport competes with the other major components of the global heat transport, namely the downward heat transport explained by the large‐scale wind‐driven vertical circulation and vertical diffusion at small scales, and the upward heat transport associated with mesoscale eddies (50‐300 km size). The contribution from motions with small spatial scales (< 50 km) and frequencies larger than one day‐1, including internal gravity waves, has never been explicitly... |
| Tipo: Text |
Palavras-chave: Ocean heat transport<; /AUTHOR_KEYWORD>; High frequency<; /AUTHOR_KEYWORD>; Ocean front<; /AUTHOR_KEYWORD>; Eddies<; /AUTHOR_KEYWORD>; Eddy transport<; /AUTHOR_KEYWORD>. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00643/75508/76354.pdf |
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