caa a22 4500 475777425 CHVBK 20180406123635.0 cr unu---uuuuu 170329e20000301xx s 000 0 eng 10.1023/A:1002482230580 doi (NATIONALLICENCE)springer-10.1023/A:1002482230580 A Sensitivity Study Of The Subtropical Ocean Surface Energy Balance To The Parameterization Of Precipitation From Stratocumulus Clouds [Elektronische Daten] [L. Delobbe, H. Gallée] In the 'sFirst Lagrangian' of the Atlantic Stratocumulus Experiment(ASTEX), a cloudy air mass was tracked as it was advected by thetrade winds toward higher sea surface temperatures. In this study,a full diurnal cycle observed during this experiment is simulated andthe impact of the precipitation parameterization is examined. The modelwe use is the one dimensional version of the hydrostatic primitiveequation model MAR (Modéle Atmosphérique Régional) developed at the Université catholique de Louvain (UCL).It includes an E-∈ turbulence closure, a wide-band formulationof the radiative transfer, and a parameterized microphysical schemeallowing partial condensation. The model realistically reproducesthe diurnal clearing of the cloud layer as well as the formation ofcumulus clouds under the stratocumulus deck. Nevertheless, as thesurface warms and the boundary layer becomes more convective,the simulation progressively differs from the observed evolution.Further experiments are carried out with different precipitationparameterizations commonly used in mesoscale modelsand general circulation models (GCMs).A strong sensitivity of the simulated liquid water path evolution isfound. The impact on the surface energy flux and the solar fluxreflected by the cloud is also examined. For both fluxes averagedover 24 hours, differences as large as 20 W m-2 are obtainedbetween the various simulations. Low cloudiness covers large areasover the ocean and such errors on the reflected solar flux may stronglyaffect the Earth's radiative budget in GCM simulations. We estimatethat the impact on the globally averaged outgoing solar flux could beas large as 5 W m-2. Furthermore, when atmospheric models arecoupled to ocean models, errors in the surface energy exchanges mayinduce significant drift in the simulated climate. Kluwer Academic Publishers, 2000 Stratocumulus nationallicence Precipitation nationallicence Marine boundary layer nationallicence Surface energy balance nationallicence Earth's radiative budget nationallicence Coupled ocean-atmosphere models nationallicence Delobbe L. Institut d'Astronomie et de Géophysique G. Lemaître, Université catholique de Louvain, Louvain-la-Neuve, Belgium aut Gallée H. Institut d'Astronomie et de Géophysique G. Lemaître, Université catholique de Louvain, Louvain-la-Neuve, Belgium aut Boundary-Layer Meteorology Kluwer Academic Publishers 94/3(2000-03-01), 399-422 0006-8314 94:3<399 2000 94 10546 https://doi.org/10.1023/A:1002482230580 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1002482230580 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Delobbe L. Institut d'Astronomie et de Géophysique G. Lemaître, Université catholique de Louvain, Louvain-la-Neuve, Belgium aut NATIONALLICENCE 700 1- Gallée H. Institut d'Astronomie et de Géophysique G. Lemaître, Université catholique de Louvain, Louvain-la-Neuve, Belgium aut NATIONALLICENCE 773 0- Boundary-Layer Meteorology Kluwer Academic Publishers 94/3(2000-03-01), 399-422 0006-8314 94:3<399 2000 94 10546 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer