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Registros recuperados: 5
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A New Coupled Ocean-Waves-Atmosphere Model Designed for Tropical Storm Studies: Example of Tropical Cyclone Bejisa (2013-2014) in the South-West Indian Ocean ArchiMer
Pianezze, J.; Barthe, C.; Bielli, S.; Tulet, P.; Jullien, Swen; Cambon, Gildas; Bousquet, O.; Claeys, M.; Cordier, E..
Ocean-Waves-Atmosphere (OWA) exchanges are not well represented in current Numerical Weather Prediction (NWP) systems, which can lead to large uncertainties in tropical cyclone track and intensity forecasts. In order to explore and better understand the impact of OWA interactions on tropical cyclone modelling, a fully coupled OWA system based on the atmospheric model Meso-NH, the oceanic model CROCO and the wave model WW3 and called MSWC was designed and applied to the case of tropical cyclone Bejisa (2013-2014). The fully coupled OWA simulation shows good agreement with the literature and available observations. In particular, simulated significant wave height is within 30 cm of measurements made with buoys and altimeters. Short-term (< 2 days)...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00428/53983/55169.pdf
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Disentangling the Mesoscale Ocean-Atmosphere Interactions ArchiMer
Renault, L.; Masson, S.; Oerder, V.; Jullien, Swen; Colas, François.
In the past decades, the use of scatterometer data allowed to demonstrate the global ubiquity of the Ocean Mesoscale Thermal FeedBack (TFB) and Current FeedBack (CFB) effects on surface winds and stress. Understanding these air‐sea interactions is of uttermost importance as the induced atmospheric anomalies partly control the ocean circulation, and, thus, can influence the Earth Climate. Whether the TFB and CFB effects can be disentangled, and whether satellite scatterometers can properly reveal them, remain rather unclear. Here, using satellite observations and ocean‐atmosphere coupled mesoscale simulations over 45° S‐45° N, we show that the CFB effect can be properly characterized and unraveled from that due to the TFB. We demonstrate that the TFB can be...
Tipo: Text Palavras-chave: Mesoscale-air-sea-interactions; Current feedback; Thermal feedback; Scatterometters; Coupling coefficients; Coupled models.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00485/59653/62685.pdf
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Global impact of tropical cyclones on primary production ArchiMer
Menkes, Christophe E.; Lengaigne, Matthieu; Levy, Marina; Ethe, Christian; Bopp, Laurent; Aumont, Olivier; Vincent, Emmanuel; Vialard, Jerome; Jullien, Swen.
In this paper, we explore the global responses of surface temperature, chlorophyll and primary production to tropical cyclones (TCs). Those ocean responses are first characterized from the statistical analysis of satellite data under ~1000 TCs over the 1998-2007 period. Besides the cold wake, the vast majority of TCs induce a weak chlorophyll response, with only ~10% of induced blooms exceeding 0.1 mg.m-3. The largest chlorophyll responses mostly occur within coastal regions, in contrast to the strongest cold wakes that generally occur farther offshore. To understand this decoupling, we analyze a coupled dynamical-biogeochemical oceanic simulation forced by realistic wind vortices applied along observed TC tracks. The simulation displays a realistic...
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Ano: 2016 URL: http://archimer.ifremer.fr/doc/00333/44449/44121.pdf
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Mesoscale SST–wind stress coupling in the Peru–Chile current system: Which mechanisms drive its seasonal variability? ArchiMer
Oerder, Vera; Colas, François; Echevin, Vincent; Masson, Sebastien; Hourdin, Christophe; Jullien, Swen; Madec, Gurvan; Lemarie, Florian.
Satellite observations and a high-resolution regional ocean–atmosphere coupled model are used to study the air/sea interactions at the oceanic mesoscale in the Peru–Chile upwelling current system. Coupling between mesoscale sea surface temperature (SST) and wind stress (WS) intensity is evidenced and characterized by correlations and regression coefficients. Both the model and the observations display similar spatial and seasonal variability of the coupling characteristics that are stronger off Peru than off Northern Chile, in relation with stronger wind mean speed and steadiness. The coupling is also more intense during winter than during summer in both regions. It is shown that WS intensity anomalies due to SST anomalies are mainly forced by mixing...
Tipo: Text Palavras-chave: Ocean-atmosphere interactions; Mesoscale SST-wind stress coupling; Regional coupled modeling; Eastern Boundary Upwelling System.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00334/44480/45790.pdf
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Roles of land surface albedo and horizontal resolution on the Indian summer monsoon biases in a coupled ocean–atmosphere tropical-channel model ArchiMer
Samson, Guillaume; Masson, Sebastien; Durand, Fabien; Terray, Pascal; Berthet, Sarah; Jullien, Swen.
The Indian summer monsoon (ISM) simulated over the 1989–2009 period with a new 0.75° ocean–atmosphere coupled tropical-channel model extending from 45°S to 45°N is presented. The model biases are comparable to those commonly found in coupled global climate models (CGCMs): the Findlater jet is too weak, precipitations are underestimated over India while they are overestimated over the southwestern Indian Ocean, South-East Asia and the Maritime Continent. The ISM onset is delayed by several weeks, an error which is also very common in current CGCMs. We show that land surface temperature errors are a major source of the ISM low-level circulation and rainfall biases in our model: a cold bias over the Middle-East (ME) region weakens the Findlater jet while a...
Tipo: Text Palavras-chave: Indian summer monsoon; Land surface albedo; Horizontal resolution; Precipitation biases; Monsoon onset; CGCM.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00334/44481/44275.pdf
Registros recuperados: 5
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