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The GASS/EUCLIPSE model intercomparison of the stratocumulus transition as observed during ASTEX: LES results.

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Title: The GASS/EUCLIPSE model intercomparison of the stratocumulus transition as observed during ASTEX: LES results.
Authors: Dussen, J. J.1, Roode, S. R.1, Ackerman, A. S.2, Blossey, P. N.3, Bretherton, C. S.3, Kurowski, M. J.4,5, Lock, A. P.6, Neggers, R. A. J.7,8, Sandu, I.9,10, Siebesma, A. P.1,11
Source: Journal of Advances in Modeling Earth Systems. Jul2013, Vol. 5 Issue 3, p483-499. 17p.
Subject Terms: *Moisture, *Rainfall, *Solar radiation, Stratocumulus clouds, Large eddy simulation models, Lagrangian functions, Atmospheric boundary layer
Abstract: Large-eddy simulations of a Lagrangian transition from a vertically well-mixed stratocumulus-topped boundary layer to a situation in which shallow cumuli penetrate an overlying layer of thin and broken stratocumulus are compared with aircraft observations collected during the Atlantic Stratocumulus Transition Experiment. Despite the complexity of the case and the long simulation period of 40 h, the six participating state-of-the-art models skillfully and consistently represent the observed gradual deepening of the boundary layer, a negative buoyancy flux at the top of the subcloud layer and the development of a double-peaked vertical velocity variance profile. The moisture flux from the subcloud to the stratocumulus cloud layer by cumulus convection exhibits a distinct diurnal cycle. During the night the moisture flux at the stratocumulus cloud base exceeds the surface evaporation flux, causing a net drying of the subcloud layer, and vice versa during daytime. The spread in the liquid water path (LWP) among the models is rather large during the first 12 h. From additional sensitivity experiments it is demonstrated that this spread is mainly attributable to differences in the parameterized precipitation rate. The LWP differences are limited through a feedback mechanism in which enhanced drizzle fluxes result in lower entrainment rates and subsequently a reduced drying at cloud top. The spread is furthermore reduced during the day as cloud layers with a greater LWP absorb more solar radiation and hence evaporate more. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Advances in Modeling Earth Systems is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: The GASS/EUCLIPSE model intercomparison of the stratocumulus transition as observed during ASTEX: LES results.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Advances+in+Modeling+Earth+Systems%22">Journal of Advances in Modeling Earth Systems</searchLink>. Jul2013, Vol. 5 Issue 3, p483-499. 17p.
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  Data: *<searchLink fieldCode="DE" term="%22Moisture%22">Moisture</searchLink><br />*<searchLink fieldCode="DE" term="%22Rainfall%22">Rainfall</searchLink><br />*<searchLink fieldCode="DE" term="%22Solar+radiation%22">Solar radiation</searchLink><br /><searchLink fieldCode="DE" term="%22Stratocumulus+clouds%22">Stratocumulus clouds</searchLink><br /><searchLink fieldCode="DE" term="%22Large+eddy+simulation+models%22">Large eddy simulation models</searchLink><br /><searchLink fieldCode="DE" term="%22Lagrangian+functions%22">Lagrangian functions</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+boundary+layer%22">Atmospheric boundary layer</searchLink>
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  Data: Large-eddy simulations of a Lagrangian transition from a vertically well-mixed stratocumulus-topped boundary layer to a situation in which shallow cumuli penetrate an overlying layer of thin and broken stratocumulus are compared with aircraft observations collected during the Atlantic Stratocumulus Transition Experiment. Despite the complexity of the case and the long simulation period of 40 h, the six participating state-of-the-art models skillfully and consistently represent the observed gradual deepening of the boundary layer, a negative buoyancy flux at the top of the subcloud layer and the development of a double-peaked vertical velocity variance profile. The moisture flux from the subcloud to the stratocumulus cloud layer by cumulus convection exhibits a distinct diurnal cycle. During the night the moisture flux at the stratocumulus cloud base exceeds the surface evaporation flux, causing a net drying of the subcloud layer, and vice versa during daytime. The spread in the liquid water path (LWP) among the models is rather large during the first 12 h. From additional sensitivity experiments it is demonstrated that this spread is mainly attributable to differences in the parameterized precipitation rate. The LWP differences are limited through a feedback mechanism in which enhanced drizzle fluxes result in lower entrainment rates and subsequently a reduced drying at cloud top. The spread is furthermore reduced during the day as cloud layers with a greater LWP absorb more solar radiation and hence evaporate more. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Advances in Modeling Earth Systems is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/jame.20033
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      – Code: eng
        Text: English
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        PageCount: 17
        StartPage: 483
    Subjects:
      – SubjectFull: Moisture
        Type: general
      – SubjectFull: Rainfall
        Type: general
      – SubjectFull: Solar radiation
        Type: general
      – SubjectFull: Stratocumulus clouds
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      – SubjectFull: Lagrangian functions
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      – SubjectFull: Atmospheric boundary layer
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      – TitleFull: The GASS/EUCLIPSE model intercomparison of the stratocumulus transition as observed during ASTEX: LES results.
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              Text: Jul2013
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