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Registros recuperados: 8
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Argo float observations of basin-scale deep convection in the Irminger sea during winter 2011-2012 ArchiMer
Piron, Anne; Thierry, Virginie; Mercier, Herle; Caniaux, Guy.
Analysis of Argo data obtained during winter 2011–2012 revealed the presence over the Irminger Basin of an exceptionally large number of profiles (41) with mixed layer depths (MLD) exceeding 700 m, which was deep enough to reach the pool of the intermediate Labrador Sea Water located in the Irminger Sea. Four of these profiles exhibited an MLD of 1000 m, which was the maximum value observed for the winter in question. The Argo sampling in the Irminger Sea during that winter, which was 3 to 4 times greater than for the preceding winters, enabled the different phases of the mixed layer deepening down to 1000 m, together with their spatial extents, to be observed for the first time. Two intense convective periods occurred: in late January south of Cape...
Tipo: Text Palavras-chave: Deep convection; Irminger Sea; Argo data; Greenland Tip Jet; Mixed layer dynamics; Air-sea interactions.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00309/42059/41354.pdf
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Atmospheric response to sea surface temperature mesoscale structures ArchiMer
Lambaerts, J.; Lapeyre, Guillaume; Plougonven, R.; Klein, Patrice.
Recent studies have revealed that strong sea surface temperature (SST) fronts, on the scale of a Western Boundary Current, significantly affect not just the Marine Boundary Layer but the entire troposphere. This has aroused renewed interest in air-sea interactions. The present study investigates the atmospheric response to fixed SST anomalies associated with mesoscale oceanic eddies and submesoscale filaments, using idealized simulations. Our main result is that in weak wind conditions, the vertical velocity in the planetary boundary layer (PBL) is linearly proportional to the SST Laplacian. This is established by a quantitative analysis in the spatial space as well as in the spectral space. Comparing the responses to two different SST fields shows that...
Tipo: Text Palavras-chave: Air-sea interactions; Boundary layer; Sea surface temperature.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00169/28047/26247.pdf
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Impact des fines échelles spatio-temporelles de l'atmosphère sur le couplage entre océan hauturier et plateau continental dans un système d'upwelling de bord est ArchiMer
Desbiolles, Fabien.
This study focuses on the oceanic response to fine atmospheric spatial and temporal scales, and especially fine wind patterns in the Benguela and Canary upwelling systems. These regions are under the influence of local or regional wind, blowing parallel to the coast. The wind is the main driver of the cold-water upwelling and is modulated by several physical processes at various scales. The nature of the interactions with the atmosphere, the ocean and the adjacent continent differs according to these processes. For the past 20 years, outstanding efforts have been made in the description and understanding of the atmospheric conditions at the sea surface. An increasing number of space missions and major technical improvements have allowed refinement of the...
Tipo: Text Palavras-chave: Système d'upwelling de bord Est; Fines échelles atmosphériques; Interactions air-mer; Profil du vent à la côte; Diffusiométrie; Modélisation numérique; Eastern boundary upwelling system; Atmospheric fine scales; Air-sea interactions; Coastal wind profile; Scatterometry; Numerical model..
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00405/51693/52257.pdf
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Integrated Observations of Global Surface Winds, Currents, and Waves: Requirements and Challenges for the Next Decade ArchiMer
Villas Bôas, Ana B.; Ardhuin, Fabrice; Ayet, Alex; Bourassa, Mark A.; Brandt, Peter; Chapron, Bertrand; Cornuelle, Bruce D.; Farrar, J. T.; Fewings, Melanie R.; Fox-kemper, Baylor; Gille, Sarah T.; Gommenginger, Christine; Heimbach, Patrick; Hell, Momme C.; Li, Qing; Mazloff, Matthew R.; Merrifield, Sophia T.; Mouche, Alexis; Rio,; Rodriguez, Ernesto; Shutler, Jamie D.; Subramanian, Aneesh C.; Terrill, Eric J.; Tsamados, Michel; Ubelmann, Clement; Van Sebille, Erik.
Ocean surface winds, currents, and waves play a crucial role in exchanges of momentum, energy, heat, freshwater, gases, and other tracers between the ocean, atmosphere, and ice. Despite surface waves being strongly coupled to the upper ocean circulation and the overlying atmosphere, efforts to improve ocean, atmospheric, and wave observations and models have evolved somewhat independently. From an observational point of view, community efforts to bridge this gap have led to proposals for satellite Doppler oceanography mission concepts, which could provide unprecedented measurements of absolute surface velocity and directional wave spectrum at global scales. This paper reviews the present state of observations of surface winds, currents, and waves, and it...
Tipo: Text Palavras-chave: Air-sea interactions; Doppler oceanography from space; Surface waves; Absolute surface velocity; Ocean surface winds.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00509/62083/66271.pdf
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Low and high frequency Madden-Julian oscillations in austral summer: interannual variations ArchiMer
Izumo, Takeshi; Masson, Sebastien; Vialard, Jerome; De Boyer Montegut, Clement; Behera, Swadhin K.; Madec, Gurvan; Takahashi, Keiko; Yamagata, Toshio.
The Madden-Julian oscillation (MJO) is the main component of intraseasonal variability of the tropical convection, with clear climatic impacts at an almost-global scale. Based on satellite observations, it is shown that there are two types of austral-summer MJO events (broadly defined as 30-120 days convective variability with eastward propagation of about 5 m/s). Equatorial MJO events have a period of 30-50 days and tend to be symmetric about the equator, whereas MJO events centered near 8A degrees S tend to have a longer period of 55-100 days. The lower-frequency variability is associated with a strong upper-ocean response, having a clear signature in both sea surface temperature and its diurnal cycle. These two MJO types have different interannual...
Tipo: Text Palavras-chave: Intraseasonal Madden-Julian oscillation (MJO); Seychelles-Chagos thermocline ridge/thermocline dome of the Indian Ocean; Indian Ocean dipole (IOD); El Nino southern oscillation (ENSO); Diurnal cycle; Oceanic diurnal warm layers; Air-sea interactions; Ocean-atmosphere coupling; Interannual variations; Mixed layer; Australian weather.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00013/12416/9221.pdf
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North Atlantic Ocean Internal Decadal Variability: Role of the Mean State and Ocean-Atmosphere Coupling ArchiMer
Gastineau, Guillaume; Mignot, Juliette; Arzel, Olivier; Huck, Thierry.
The origin of the decadal variability in the North Atlantic Ocean is investigated in a series of coupled and ocean-only numerical experiments. Two versions of the IPSL-CM5A model are considered, differing only by their atmospheric horizontal resolution (3.75 degrees x1.87 degrees and 2.5 degrees x1.25 degrees). When the ocean model is forced by the climatological surface fluxes from the low atmospheric resolution coupled model version, a 20-year variability emerges, similar to the variability found in the coupled simulation. Such decadal variability is consistent with a large-scale baroclinic instability of the mean flow in the west European basin. Increasing the atmospheric resolution leads to a more intense Icelandic low, which intensifies the western...
Tipo: Text Palavras-chave: Climate variability; Atlantic Ocean; Atmosphere-ocean general circulation models; Air-sea interactions; Atlantic subpolar gyre; Atlantic Meridional Overturning Circulation.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00462/57374/59434.pdf
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Observation de la convection profonde en mer d'Irminger sur la période 2002-2015 par les flotteurs Argo. ArchiMer
Piron, Anne.
The deep convection events are important because they form the intermediate and deep water masses feeding the global circulation. The Labrador Sea is the main site of deep convection in the North Atlantic Ocean and produces the intermediate Labrador Sea Water (LSW). The Irminger Sea was also cited but was forgotten during decades because of the lack of direct observations. This thesis provides the first description of the Irminger Sea deep convection at basin scale, thanks to the Argo data. Three convective events occurred in the Irminger Sea since 2010. During the 2011-2012 winter, the convection reached 1000 m and is explained by the sequence of the Greenland tip jets. The event of the 2013-2014 winter, reaching 1300 m, is characterized by a strong...
Tipo: Text Palavras-chave: Convection profonde; Mer d’Irminger; Données Argo; Tip jets groenlandais; Couche de mélange hivernale; Interactions océan-atmosphère; Deep convection; Irminger Sea; Argo data; Greenland tip jets; Winter mixed layer; Air-sea interactions.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00313/42434/41781.pdf
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Oceanic control of multidecadal variability in an idealized coupled GCM ArchiMer
Jamet, Quentin; Huck, Thierry; Arzel, Olivier; Campin, Jean-michel; De Verdiere, Alain Colin.
Idealized ocean models are known to develop intrinsic multidecadal oscillations of the meridional overturning circulation (MOC). Here we explore the role of ocean–atmosphere interactions on this low-frequency variability. We use a coupled ocean–atmosphere model set up in a flat-bottom aquaplanet geometry with two meridional boundaries. The model is run at three different horizontal resolutions (4°, 2° and 1°) in both the ocean and atmosphere. At all resolutions, the MOC exhibits spontaneous variability on multidecadal timescales in the range 30–40 years, associated with the propagation of large-scale baroclinic Rossby waves across the Atlantic-like basin. The unstable region of growth of these waves through the long wave limit of baroclinic instability...
Tipo: Text Palavras-chave: Atlantic multidecadal oscillation; Air-sea interactions; NAO; Rossby waves; Idealized configuration.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00334/44483/44197.pdf
Registros recuperados: 8
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