Implementation and validation of a new prognostic large‐scale cloud and precipitation scheme for climate and data‐assimilation purposes

Lopez, Philippe

doi:10.1256/00359000260498879

Cited by 112 publications

(126 citation statements)

References 36 publications

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“…The dynamical core is based on the cycle 37t1 of ARPEGE-IFS and the physical package has been largely renewed since version 5. In particular, it includes a new turbulence scheme with a 1.5-order prognostic scheme for the turbulence kinetic energy (Cuxart et al 2000); a new convection scheme including dry, shallow, and deep convection (Piriou et al 2007;Guérémy 2011); a new large-scale microphysics scheme with prognostic liquid/ solid cloud/rain variables based on the work of Lopez (2002) and a new radiative scheme for infrared radiation (RRTM, Rapid Radiative Transfer Model, Mlawer et al 1997). An updated version (6 bands) of the shortwave radiation scheme is used (Fouquart and Bonnel 1980;Morcrette et al 2008).…”

Section: Aladin Regional Climate Modelmentioning

confidence: 99%

Benefits of explicit urban parameterization in regional climate modeling to study climate and city interactions

et al. 2018

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Most climate models do not explicitly model urban areas and at best describe them as rock covers. Nonetheless, the very high resolutions reached now by the regional climate models may justify and require a more realistic parameterization of surface exchanges between urban canopy and atmosphere. To quantify the potential impact of urbanization on the regional climate, and evaluate the benefits of a detailed urban canopy model compared with a simpler approach, a sensitivity study was carried out over France at a 12-km horizontal resolution with the ALADIN-Climate regional model for 1980-2009 time period. Different descriptions of land use and urban modeling were compared, corresponding to an explicit modeling of cities with the urban canopy model TEB, a conventional and simpler approach representing urban areas as rocks, and a vegetated experiment for which cities are replaced by natural covers. A general evaluation of ALADIN-Climate was first done, that showed an overestimation of the incoming solar radiation but satisfying results in terms of precipitation and near-surface temperatures. The sensitivity analysis then highlighted that urban areas had a significant impact on modeled near-surface temperature. A further analysis on a few large French cities indicated that over the 30 years of simulation they all induced a warming effect both at daytime and nighttime with values up to + 1.5 °C for the city of Paris. The urban model also led to a regional warming extending beyond the urban areas boundaries. Finally, the comparison to temperature observations available for Paris area highlighted that the detailed urban canopy model improved the modeling of the urban heat island compared with a simpler approach.

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Section: Aladin Regional Climate Modelmentioning

confidence: 99%

Benefits of explicit urban parameterization in regional climate modeling to study climate and city interactions

et al. 2018

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“…The physical package used in the ARPEGE model is state-of-the-art, with a turbulent kinetic energy scheme associated with a mass flux scheme for the boundary layer (Bazile et al, 2011). The clouds and the microphysics use four prognostic variables such as cloud water, cloud ice, rain and snow (Lopez, 2002;Bouteloup et al, 2005). The radiative transfer in the atmosphere is computed with the rapid radiative transfer model (RRTM) scheme (Mlawer et al, 1997) for the long-wave and the shortwave with the Fouquart-Morcrette scheme (Fouquart and Bonnel, 1980;Morcrette et al, 2001).…”

Section: The Arpege Modelmentioning

confidence: 99%

Genesis of diamond dust, ice fog and thick cloud episodes observed and modelled above Dome C, Antarctica

Ricaud¹,

Bazile²,

Guasta³

et al. 2017

Atmos. Chem. Phys.

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Abstract. Episodes of thick cloud and diamond dust/ice fog were observed during 15 March to 8 April 2011 and 4 to 5 March 2013 in the atmosphere above Dome C (Concordia station, Antarctica; 75 • 06 S, 123 • 21 E; 3233 m a.m.s.l.). The objectives of the paper are mainly to investigate the processes that cause these episodes based on observations and to verify whether operational models can evaluate them. The measurements were obtained from the following instruments: (1) a ground-based microwave radiometer (HAM-STRAD, H 2 O Antarctica Microwave Stratospheric and Tropospheric Radiometers) installed at Dome C that provided vertical profiles of tropospheric temperature and absolute humidity every 7 min; (2) daily radiosoundings launched at 12:00 UTC at Dome C; (3) a tropospheric aerosol lidar that provides aerosol depolarization ratio along the vertical at Dome C; (4) down-and upward short-and long-wave radiations as provided by the Baseline Surface Radiation Network (BSRN) facilities; (5) an ICE-CAMERA to detect at an hourly rate the size of the ice crystal grains deposited at the surface of the camera; and (6) space-borne aerosol depolarization ratio from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) lidar aboard the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) platform along orbits close to the Dome C station. The time evolution of the atmosphere has also been evaluated by considering the outputs from the mesoscale AROME and the global-scale ARPEGE meteorological models. Thick clouds are detected during the warm and wet periods (24-26 March 2011 and 4 March 2013) with high depolarization ratios (greater than 30 %) from the surface to 5-7 km above the ground associated with precipitation of ice particles and the presence of a supercooled liquid water (depolarization less than 10 %) clouds. Diamond dust and/or ice fog are detected during the cold and dry periods (5 April 2011 and 5 March 2013) with high depolarization ratios (greater than 30 %) in the planetary boundary layer to a maximum altitude of 100-300 m above the ground with little trace of precipitation. Considering 5-day back trajectories, we show that the thick cloud episodes are attributed to air masses with an oceanic origin whilst the diamond dust/ice fog episodes are attributed to air masses with continental origins. Although operational models can reproduce thick cloud episodes in the free troposphere, they cannot evaluate the diamond dust/ice fog episodes in the planetary boundary layer because they require to use more sophisticated cloud and aerosol microphysics schemes.

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“…The microphysical scheme describing the interactions between these fives species follows the one documented in Lopez (2002).…”

Section: Physical Parameterizations and Interface To Dynamicsmentioning

confidence: 99%

Dynamical kernel of the Aladin–NH spectral limited‐area model: Revised formulation and sensitivity experiments

Bénard

Vivoda

Mašek

et al. 2010

Quart J Royal Meteoro Soc

127

154

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† The contribution of C. Smith was written in the course of his employment at the Met Office, UK and is published with the permission of the controller of HMSO and the Queen's Printer for Scottland.Drawing from the results of theoretical studies about the behaviour of constantcoefficients semi-implicit schemes, the dynamical kernel of the Aladin-NH spectral limited-area numerical weather prediction (NWP) model has been modified in order to allow for a stable and efficient integration of the fully elastic Euler equations. The resulting dynamical kernel offers the possibility to use semi-Lagrangian transport schemes together with two-time-level discretizations at kilometric scales for NWP purposes. The main characteristics of the adiabatic part of the model formulation and the space and time discretization are described in this article. In order to illustrate the dependence of the results on adjustable parameters of the dynamical kernel, some real-case dynamical-adaptation forecasts performed with a basic physical parameterization package are presented. The results obtained with this model in real-case experiments fully confirm the conclusions drawn in previous numerical analysis studies. The good quality of the results is found to be compatible with a routine exploitation in a NWP framework. The Aladin-NH dynamical kernel has been used in the operational NWP 'AROME' model since December 2008 at the kilometric scale, with an appropriate physical parameterization package and data assimilation system.

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Implementation and validation of a new prognostic large‐scale cloud and precipitation scheme for climate and data‐assimilation purposes

Cited by 112 publications

References 36 publications

Benefits of explicit urban parameterization in regional climate modeling to study climate and city interactions

Benefits of explicit urban parameterization in regional climate modeling to study climate and city interactions

Genesis of diamond dust, ice fog and thick cloud episodes observed and modelled above Dome C, Antarctica

Dynamical kernel of the Aladin–NH spectral limited‐area model: Revised formulation and sensitivity experiments

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