The Atlantic Stratocumulus Transition Experiment—ASTEX

Albrecht, Bruce A.; Bretherton, Christopher S.; Johnson, Doug; Scubert, Wayne H.; Frisch, A. S.

doi:10.1175/1520-0477(1995)076<0889:taste>2.0.co;2

Cited by 350 publications

(235 citation statements)

References 16 publications

(19 reference statements)

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“…At the same time, meteorological factors and the decoupling processes have large influences on the cloud LWP variation as well. The aircraft flights lasted no more than five hours on each flight days and the time gap between two flights was generally longer than 24 h. Thus, it was not possible to capture the continuous evolution of the cloud layer and the processes affecting the boundary layer structure and clouds at the time scales from hours to days, which could also be critical for the cloud LWP variation (e.g., Albrecht et al, 1995a;Sandu et al, 2008). Additionally, only 18 flights were completed, which is insufficient for finding a statistically significant correlation.…”

Section: Discussionmentioning

confidence: 93%

Observations of the boundary layer, cloud, and aerosol variability in the southeast Pacific near-coastal marine stratocumulus during VOCALS-REx

et al. 2011

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Abstract. Aircraft observations made off the coast of northern Chile in the Southeastern Pacific (20 • S, 72 • W; named Point Alpha) from 16 October to 13 November 2008 during the VAMOS Ocean-Cloud-Atmosphere-Land StudyRegional Experiment (VOCALS-REx), combined with meteorological reanalysis, satellite measurements, and radiosonde data, are used to investigate the boundary layer (BL) and aerosol-cloud-drizzle variations in this region. On days without predominately synoptic and meso-scale influences, the BL at Point Alpha was typical of a non-drizzling stratocumulus-topped BL. Entrainment rates calculated from the near cloud-top fluxes and turbulence in the BL at Point Alpha appeared to be weaker than those in the BL over the open ocean west of Point Alpha and the BL near the coast of the northeast Pacific. The cloud liquid water path (LWP) varied between 15 g m −2 and 160 g m −2 . The BL had a depth of 1140 ± 120 m, was generally well-mixed and capped by a sharp inversion without predominately synoptic and mesoscale influences. The wind direction generally switched from southerly within the BL to northerly above the inversion. On days when a synoptic system and related mesoscale costal circulations affected conditions at Point Alpha (29 OctoberCorrespondence to: X. Zheng (xzheng@rsmas.miami.edu) 4 November), a moist layer above the inversion moved over Point Alpha, and the total-water mixing ratio above the inversion was larger than that within the BL.The accumulation mode aerosol varied from 250 to 700 cm −3 within the BL, and CCN at 0.2 % supersaturation within the BL ranged between 150 and 550 cm −3 . The main aerosol source at Point Alpha was horizontal advection within the BL from south. The average cloud droplet number concentration ranged between 80 and 400 cm −3 . While the mean LWP retrieved from GOES was in good agreement with the in situ measurements, the GOES-derived cloud droplet effective radius tended to be larger than that from the aircraft in situ observations near cloud top. The aerosol and cloud LWP relationship reveals that during the typical wellmixed BL days the cloud LWP increased with the CCN concentrations. On the other hand, meteorological factors and the decoupling processes have large influences on the cloud LWP variation as well.

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Section: Discussionmentioning

confidence: 93%

Observations of the boundary layer, cloud, and aerosol variability in the southeast Pacific near-coastal marine stratocumulus during VOCALS-REx

et al. 2011

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“…Stratocumulus -the ASTEX case ASTEX took place over the area near the Azores and Madeira Islands in the Atlantic Ocean off North Africa on 1−28 June 1992 (Albrecht et al 1995). A stratocumulus case with no drizzle was configured based upon the ASTEX observations (de Roode and Duynkerke 1997) 2 , which represented a typical stratocumulus-topped boundary layer.…”

Section: Mean Thermodynamic Profilesmentioning

confidence: 99%

Simulation of Boundary-Layer Cumulus and Stratocumulus Clouds Using a Cloud-Resolving Model with Low-and Third-order Turbulence Closures

Cheng

2008

Journal of the Meteorological Society of Japan

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“…They play an important role in the moisture transport to the free atmosphere (Tiedtke, 1989) and for the earth's radiation budget (Albrecht et al, 1995). Furthermore, shallow cumulus convection significantly influences the dynamics of the sub-cloud layer (SCL) and cloud layer (CL) by intensifying the vertical transport of moisture, momentum, and heat from the surface to higher levels (Stevens, 2007).…”

Section: Introductionmentioning

confidence: 99%

The fine-scale structure of the trade wind cumuli over Barbados – an introduction to the CARRIBA project

et al. 2013

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Abstract. The CARRIBA (Cloud, Aerosol, Radiation and tuRbulence in the trade wInd regime over BArbados) project, focused on high resolution and collocated measurements of thermodynamic, turbulent, microphysical, and radiative properties of trade wind cumuli over Barbados, is introduced. The project is based on two one-month field campaigns in November 2010 (climatic wet season) and April 2011 (climatic dry season). Observations are based on helicopterborne and ground-based measurements in an area of 100 km 2 off the coast of Barbados. CARRIBA is accompanied by long-term observations at the Barbados Cloud Observatory located at the East coast of Barbados since early in 2010 and which provides a longer-term context for the CARRIBA measurements. The deployed instrumentation and sampling strategy are presented together with a classification of the meteorological conditions. The two campaigns were influenced by different air masses advected from the Caribbean area, the Atlantic Ocean, and the African continent which led to distinct aerosol conditions. Pristine conditions with low aerosol particle number concentrations of ∼100 cm 3 were alternating with periods influenced by Saharan dust or aerosol from biomass burning resulting in comparably high number concentrations of ∼ 500 cm 3 . The biomass burning aerosol was originating from both the Caribbean area and Africa. The shallow cumulus clouds responded to the different aerosol conditions with a wide range of mean droplet sizes and number concentrations. Two days with different aerosol and cloud microphysical properties but almost identical meteorological conditions have been analyzed in detail. The differences in the droplet number concentration and droplet sizes appear not to show any significant change for turbulent cloud mixing, but the relative roles of droplet inertia and sedimentation in initiating coalescence, as well as the cloud reflectivity, do change substantially.

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The Atlantic Stratocumulus Transition Experiment—ASTEX

Cited by 350 publications

References 16 publications

Observations of the boundary layer, cloud, and aerosol variability in the southeast Pacific near-coastal marine stratocumulus during VOCALS-REx

Observations of the boundary layer, cloud, and aerosol variability in the southeast Pacific near-coastal marine stratocumulus during VOCALS-REx

Simulation of Boundary-Layer Cumulus and Stratocumulus Clouds Using a Cloud-Resolving Model with Low-and Third-order Turbulence Closures

The fine-scale structure of the trade wind cumuli over Barbados – an introduction to the CARRIBA project

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