Consulta: subjectFacets:"Convection"
Registros recuperados: 5
Data/hora: 26/07/2024 23:16:52

A Lagrangian Method to Isolate the Impacts of Mixed Layer Subduction on the Meridional Overturning Circulation in a Numerical Model
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Thomas, Matthew; Treguier, Anne-marie; Blanke, Bruno; Deshayes, Julie; Voldoire, Aurore.
Large differences in the Atlantic meridional overturning circulation (AMOC) exhibited between the available ocean models pose problems as to how they can be interpreted for climate policy. A novel Lagrangian methodology has been developed for use with ocean models that enables a decomposition of the AMOC according to its source waters of subduction from the mixed layer of different geographical regions. The method is described here and used to decompose the AMOC of the Centre National de Recherches Météorologiques (CNRM) ocean model, which is approximately 4.5 Sv (1 Sv = 106 m3 s−1) too weak at 26°N, compared to observations. Contributions from mixed layer subduction to the peak AMOC at 26°N in the model are dominated by the Labrador Sea, which contributes...
Tipo: Text
Palavras-chave: Circulation; Dynamics; Convection; Lagrangian circulation; Transport; Meridional overturning circulation; Atm; Ocean Structure; Phenomena; Oceanic mixed layer; Models and modeling; General circulation models.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00284/39523/38016.pdf

Diurnal variability of rainfall in southwest Amazonia during the LBA-TRMM field campaign of the austral summer of 1999
Provedor de dados: Acta Amazonica
Autores: Marengo,José A.; Fisch,Gilberto; Morales,Carlos; Vendrame,Iria; Dias,Paulo C.
The TRMM-LBA field campaign was held during the austral summer of 1999 in southwestern Amazonia. Among the major objectives, was the identification and description of the diurnal variability of rainfall in the region, associated with the different rain producing weather systems that occurred during the January-February season. By using a network of 40 digital rain gauges implemented in the state of Rondônia, and together with observations and analyses of circulation and convection, it was possible to identify details of the diurnal cycle of rainfall and the associated rainfall mechanisms. Rainfall episodes were characterized by regimes of "low-level easterly" and "westerly" winds in the context of the large-scale circulation. The westerly regime is related...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Convection; Raingauge; Rainfall; Diurnal cycle.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672004000400011

Estimating mud expulsion rates from temperature measurements on Hakon Mosby Mud Volcano, SW Barents Sea
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Kaul, Norbert; Foucher, Jean-paul; Heesemann, M.
The HAkon Mosby Mud Volcano (HMMV), located on the Norwegian-Barents-Svalbard continental margin in 1250 m water depth, has been identified and described as a structure caused by upward transport of mud, pore water and gas [e.g. Eldhohn, O., Sundvor, E., Vogt, P.R., Hjelstuen, B.O., Crane, K., Nilsen, A.K., Gladczenko, T.P., 1999. SW Barents Sea continental margin heat flow and HAkon Mosby Volcano. Geo-Marine Letters 19, 29-37]. During R V Polarstern expedition ARK XIX/3b in 2003, an integrated study took place to investigate the detailed morphology, biology, chemistry and geophysical aspects of HMMV [Kiages, M., Thiede, J., Foucher, J.-P., 2004. The Expeditions ARK XIX 3a, 3b and 3c, Berichte zur Polarforschung, 488.]. In this paper, we describe a...
Tipo: Text
Palavras-chave: SW Barents Sea; Convection; Heat flow; Mud volcano; Seafloor hydrothermal system.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2002.pdf

Oxygen Saturation Surrounding Deep Water Formation Events in the Labrador Sea From Argo-O-2 Data
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Wolf, Mitchell K.; Hamme, Roberta C.; Gilbert, Denis; Yashayaev, Igor; Thierry, Virginie.
Deep water formation supplies oxygen-rich water to the deep sea, spreading throughout the ocean by means of the global thermohaline circulation. Models suggest that dissolved gases in newly formed deep water do not come to equilibrium with the atmosphere. However, direct measurements during wintertime convection are scarce, and the controls over the extent of these disequilibria are poorly quantified. Here we show that, when convection reached deeper than 800 m, oxygen in the Labrador Sea was consistently undersaturated at -6.1% to -7.6% at the end of convection. Deeper convection resulted in greater undersaturation, while convection ending later in the year resulted in values closer to equilibrium, from which we produce a predictive relationship. We use...
Tipo: Text
Palavras-chave: Oxygen saturation; Convection; Argo; Labrador Sea; Deep water formation.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00442/55329/56829.pdf

Transport coefficients for low and high-rate mass transfer along a biological horizontal cylinder
Provedor de dados: Revista Brasileira de Engenharia Agrícola e Ambiental
Autores: Barreto,Alberto A.; Fortes,Mauri; Ferreira,Wanyr R.; Crespo,Luiz C. A.
Knowledge of heat and mass transfer coefficients is essential for drying simulation studies or design of food and grain thermal processes, including drying. This work presents the full development of a segregated finite element method to solve convection-diffusion problems. The developed scheme allows solving the incompressible, steady-state Navier-Stokes equations and convective-diffusive problems with temperature and moisture dependent properties. The problem of simultaneous energy, momentum and species transfer along an infinite, horizontal cylinder under drying conditions in forced convection is presented, considering conditions normally found in biological material thermal treatment or drying. Numerical results for Nusselt and Sherwood numbers were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drying; Heat transfer; Convection; Diffusion.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662006000200027