Exploració per autor "Lothon, Marie"

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    • Boundary Layer Late Afternoon and Sunset Turbulence: the BLLAST 2011 experiment 

      Pino González, David; Lothon, Marie; Lohou, Fabienne; Pardyjak, Erick; Reuder, Joaquim; Legain, Dominique; Durand, Pierre; Couvreux, Fleur; Vilà-Guerau de Arellano, Jordi (2012)
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    • Countergradient heat flux observations during the evening transition period 

      Blay Carreras, Estel; Pardyjak, Eric; Pino González, David; Alexander, Daniel; Lohou, Fabienne; Lothon, Marie (2014-09-03)
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      Gradient-based turbulence models generally assume that the buoyancy flux ceases to introduce heat into the surface layer of the atmospheric boundary layer in temporal consonance with the gradient of the local virtual ...

    • Estimation of the advection effects induced by surface heterogeneities in the surface energy budget 

      Cuxart Rodamillans, Joan; Wrenger, Burkhard; Martínez Villagrasa, Daniel; Reuder, Joachim; Jonassen, Marius O.; Jiménez Cortés, Maria Antonia; Lothon, Marie; Lohou, Fabienne; Hartogensis, Oscar; Dünnermann, Jens; Conangla Triviño, Laura; Garai, Anirban (2016-07-29)
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    • Evolution of the turbulence during the afternoon transition of the convective boundary layer: a spectral analysis 

      Darbieu, Clara; Lohou, Fabienne; Lothon, Marie; Couvreux, Fleur; Pino González, David; Durand, Pierre; Blay Carreras, Estel; Vilà Guerau de Arellano, Jordi (American Meteorological Society, 2014)
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      The transition from a well-mixed convective boundary layer to a residual layer overlying a stabilized nocturnal layer raises several issues, which remain difficult to address from both modeling and observational perspectives. ...

    • How do the surface energy fluxes change when a more realistic land cover is included in the WRF model? An evaluation using BLLAST data 

      Román-Gascón, C.; Lothon, Marie; Lohou, Fabienne; Hartogensis, Oscar; Vilà Guerau de Arellano, Jordi; Pino González, David; Yague, Carlos; Pardyjak, Eric (European Geosciences Union (EGU), 2021)
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      Ideally, numerical weather prediction (NWP) and climate models should include a proper representation of the land surface to correctly simulate the surface energy fluxes and, ultimately, provide successful forecasts of ...

    • Observations and large-eddy simulations of entrainment in the sheared sahelian boundary layer 

      Canut, Guylaine; Couvreux, Fleur; Lothon, Marie; Pino González, David; Saïd, Frédérique (2011-10-16)
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      At the top of the planetary boundary layer, the entrainment of air, which incorporates dry and warm air from the free troposphere into the boundary layer, is a key process for exchanges with the free troposphere since ...

    • Role of the residual layer and large-scale subsidence on the development and evolution of the convective boundary layer 

      Blay Carreras, Estel; Pino González, David; Vilà Guerau de Arellano, Jordi; van de Boer, Anneke; de Coster, Olivier; Darbieu, Clara; Hartogensis, Oskar; Lohou, Fabienne; Lothon, Marie; Pietersen, Henk (2014-01-01)
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      Observations, mixed-layer theory and the Dutch Large-Eddy Simulation model (DALES) are used to analyze the dynamics of the boundary layer during an intensive operational period (1 July 2011) of the Boundary Layer Late ...

    • Study of a prototypical convective boundary layer observed during BLLAST: contributions by large-scale forcings 

      Pietersen, Henk; Vilà Guerau de Arellano, Jordi; Augustin, P; van de Boer, Anneke; de Coster, Olivier; Delbarre, Hervé; Durand, Pierre; Fourmentin, M; Gioli, Beniamino; Hartogensis, Oskar; Lohou, Fabienne; Lothon, Marie; Ouwersloot, Huug; Pino González, David; Reuder, Joachim (2015-04-24)
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      We study the influence of the large-scale at- mospheric contribution to the dynamics of the convective boundary layer (CBL) in a situation observed during the Boundary Layer Late Afternoon and ...

    • Studying the Boundary Layer Late Afternoon and Sunset Turbulence (BLLAST) 

      Vilà-Guerau de Arellano, Jordi; Pino González, David; Pardyjak, Erick; Mahrt, Larry; Lohou, Fabienne; Jonker, Harm J. J.; Gioli, Beniamino; Gibert, Fabien; Durand, Pierre; Lothon, Marie; Lenschow, Donald; Angevine, Wayne; Bange, Jens; Beare, Robert; Canut, Guylaine; Couvreux, Fleur; Delbarre, Hervé (2010)
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      At the end of the afternoon, when the surface heat fluxes start to sharply decrease, the CBL turns from a convective well-mixed layer to an intermittently turbulent residual layer overlying a stably-stratified ...

    • Studying the Boundary Layer Late Afternoon nd Sunset Turbulence (BLLAST) 

      Pino González, David; Lothon, Marie; Angevine, Wayne M.; Bange, Jens; Beare, R.J.; Beyrich, Frank; Canut, Guylaine; Couvreux, Fleur; Delbarre, Hervé; Gibert, Fabien; Jonker, Harm J. J.; Lenschow, Donald; Lohou, Fabienne; Mahrt, Larry; Pardyjak, Eric; Sorbjan, Zibgniew; Vilà-Guerau de Arellano, Jordi (2010)
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      At the end of the afternoon, when the surface heat fluxes start to sharply decrease, the CBL turns from a convective well-mixed layer to an intermittently turbulent residual layer overlying a stably-stratified boundary ...

    • Surface representation impacts on turbulent heat fluxes in the weather research and forecasting (WRF) model (v.4.1.3) 

      Román-Gascón, C.; Lothon, Marie; Lohou, Fabienne; Hartogensis, Oscar; Vilà Guerau de Arellano, Jordi; Pino González, David; Yague, Carlos; Pardyjak, Eric (2021-06-29)
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      The water and energy transfers at the interface between the Earth’s surface and the atmosphere should be correctly simulated in numerical weather and climate models. This implies the need for a realistic and accurate ...

    • The BLLAST field experiment: boundary-layer late afternoon and sunset turbulence 

      Lothon, Marie; Lohou, Fabienne; Pino González, David (2014-10-16)
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      Due to the major role of the sun in heating the earth’s surface, the atmospheric planetary boundary layer over land is inherently marked by a diurnal cycle. The after-noon transition, the period of the day that connects ...

    • The Boundary Layer Late Afternoon and Sunset Turbulence 2011 field experiment (BLT) 

      Lothon, Marie; Lohou, Fabienne; Durand, Pierre; Couvreux, Fleur; Hartogensis, Oskar; Legain, Dominique; Pardyjak, Erick; Pino González, David; Reuder, Joaquim; Vilà-Guerau de Arellano, Jordi (2012)
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      Growth of the CBL over land in the middle of the day has been extensively observed and relatively successfully modeled. However the late afternoon transition (LAT), like the morning transition, is difficult to observe ...

    • The entrainment process between the Monsoon flow and the Saharan Air Layer in the West African Monsoon system 

      Canut, Guylaine; Couvreux, Fleur; Lothon, Marie; Pino González, David; Saïd, Frédérique (2010)
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    • Turbulence vertical structure of the boundary layer during the afternoon transition 

      Darbieu, Clara; Lohou, Fabienne; Lothon, Marie; Vilà Guerau de Arellano, Jordi; Couvreux, Fleur; Durand, Pierre; Pino González, David; Patton, Edward; Nilsson, Erik; Blay-Carreras, Estel; Gioli, Beniamino (2015-09-09)
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      We investigate the decay of planetary boundary layer (PBL) turbulence in the afternoon, from the time the surface buoyancy flux starts to decrease until sunset. Dense observations of mean and turbulent parameters ...