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Topic: Stratocumulus

Related Topics

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Nimbostratus

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	Houze's Cloud Atlas: Stratocumulus
		Stratocumulus seen from aircraft over the Atlantic Ocean, west of the southwest coast of England.
		Rows of stratocumulus as seen from a B-47 aircraft at 11 km on 10 April 1957.
		Satellite view of stratocumulus of the eastern and southeastern coast of North America.
	www.atmos.washington.edu /gcg/Atlas/stratocu.html (130 words)

	LOW CLOUDS-STRATOCUMULUS (Site not responding. Last check: 2007-10-08)
		Stratocumulus clouds are generally found under a large storm cloud.
		This type of stratocumulus cloud is an immediate indicator of bad weather from a sprinkle to heavy precipitation.
		This type of stratocumulus cloud is characterized as low to middle water clouds with gold, pink, amber, lavender or rosy backrounds.
	www.geo.mtu.edu /department/classes/ge406/tjbrabec/stratocumulus.html (141 words)

	Stratocumulus
		Stratocumulus are similar to altocumulus but are at lower altitude and the cells are bigger and often covers the whole sky.
		This stratocumulus was formed of collapsed cumulus clouds in late afternoon when the convective movement stopped.
		Like this stratocumulus layer where half of it is sunlit, and the other half is not.
	www.chitambo.com /clouds/cloudshtml/stratocumulus.html (144 words)

	Cotton Library Subject Index
		This article on stratocumulus is one of a series of teaching papers on mesoscale meteorology developeda the Meteorological office College.
		Observations of anticyclonic stratocumulus obtained with ground-based and balloon-borne equipment during the night of 19/20 November 1976 at Cardington, Bedford, UK, are described in relation to the synoptic situation.
		Conditions under which stratocumulus cloud decks become unstable and break apart into patchy trade cumulus are investigated using observations made over the Pacific and a theoretical analysis with a mixed-layer model.
	rams.atmos.colostate.edu /cgi-bin/library/displaysubjects.pl?30 (1125 words)

	SCM ASTEX
		If the stratocumulus is initially very thin then the mean droplet size will only be very small therefore the penetration of the cumulus cloud has the potential to increase the mean droplet size in the stratocumulus.
		From the perspective of the radiative transfer characteristics of the stratocumulus layer the change in the liquid water path dominates the interaction, with the resultant effect that the stratocumulus layer's reflectivity is increased.
		Stratocumulus clouds therefore have a great potential for changing the global energy budget and thus the climate through the indirect effects of aerosols (Twomey, 1977; Charlson et al., 1987).
	kiwi.atmos.colostate.edu /scm/astex.html (3533 words)

	NOAA ETL Numerical modeling of clouds (Site not responding. Last check: 2007-10-08)
		Stratocumulus clouds are known to have a significant impact on the earth's climate by modifying radiative transfer.
		To achieve this it is important to consider macroscopic fields such as cloud cover, depth, and liquid water path, as well as microscopic properties such as the size distribution of aerosol and drops.
		Analysis of remote sensing techniques to measure stratocumulus cloud water and drizzle with K band Doppler radar and radiometer.
	www.etl.noaa.gov /et2/aca/aie/eddy_simulation.html (850 words)

	Stratocumulus Cloud (Site not responding. Last check: 2007-10-08)
		This cloud is called stratocumulus, meaning sheets of lumpy cloud.
		Stratocumulus is grey, white, or a mixture of both, usually with some darker patches.
		Although stratocumulus is not usually a badweather cloud, its presence may indicate that worse weather is on its way, or is just clearing.
	www.mmem.spschools.org /grade5science/weather/stratocumulus.html (132 words)

	BBC - Weather Centre - Features - Weather Basics - Clouds - Stratocumulus and Altocumulus
		There is no great difference in the properties of stratocumulus and altocumulus since both are composed of water droplets and are normally limited in vertical extent, so the distinction is rather an arbitrary one.
		Stratocumulus will often give a sheet of almost total cloud cover, with perhaps one or two breaks.
		Both stratocumulus and alto cumulus are formed by weak convection currents, perhaps triggered by turbulent airflows aloft.
	www.bbc.co.uk /weather/features/weatherbasics/cloud_stratocumulus.shtml (337 words)

	Stratocumulus (glossary definition)
		Stratocumulus (Sc) A principal low-level cloud type (cloud genus), predominantly stratiform, in the form of relatively low gray and/or whitish layer, sheet or patch.
		Its elements are often arranged in bands or rolls that lie across the wind.
		Light rain, snow, or sleet may fall from stratocumulus.
	nsidc.org /arcticmet/glossary/stratocumulus.html (47 words)

	Mesoscale & Microscale Meteorology Division of NCAR
		During this transition, along the air trajectory the cloud cover is drastically reduced and hence solar radiation input to the ocean is drastically increased.
		In the incipient stages of this transition, the stratocumulus layer typically becomes "decoupled" from the well-mixed layer near the surface; here stratocumulus becomes only weakly linked to the surface process, and cumulus often develops under the stratocumulus deck.
		Important processes for this decoupling and development of cumulus under stratocumulus include evaporation of drizzle, short wave radiative warming of the stratocumulus, and surface heat flux.
	www.mmm.ucar.edu /caspp/caspp_boundary.html (1193 words)

	Precipitation in stratocumulus ... (Site not responding. Last check: 2007-10-08)
		The spatial and temporal variability of precipitating stratocumulus layers is examined using aircraft observations, satellite retrievals of cloud optical depth, and one-dimensional models that include coalescence and a simple representation of layer turbulence.
		The satellite observations show that, despite this local water loss, the distribution of cloud optical thickness remains nearly constant over the course of a day, indicating that on larger scales precipitation removal and cloud-top entrainment are in approximate balance with the vapor flux.
		The authors apply analytic and numerical models of steady-state precipitation to the observed microphysical conditions, and find that the models can match the drop size distributions observed during both heavy and light stratocumulus rainfall, but are especially sensitive to the processes governing the growth rate of the smallest drizzle drops.
	www.eos.ubc.ca /personal/paustin/austin95precip.html (197 words)

	Dynamics and Chemistry of Marine Stratocumulus -- DYCOMS-II (ResearchIndex) (Site not responding. Last check: 2007-10-08)
		Abstract: The second Dynamics and Chemistry of Marine Stratocumulus (DYCOMS-II) field study is described.
		The objective of the program was to better understand the physics and dynamics of marine stratocumulus.
		A comparison of the ECMWF forecast model with observations..
	citeseer.ist.psu.edu /628463.html (175 words)

	CASE 3: FIRE SCU (Site not responding. Last check: 2007-10-08)
		The extensive sheets of stratus and stratocumulus found on the eastern side of ocean basins may have a strong influence of the planet's climate.
		This case, which is based on the observations of Hignett (1991, JAS) and similar to a EUROCS model intercomparison, examines the impact of short-wave radiation on the boundary layer dynamics and thence the cloud thickness.
		Stratocumulus sheets are usually located at the top of a mixed layer beneath a strong inversion.
	www.met.rdg.ac.uk /~marc/lem/jon/test3.html (317 words)

	2A.6 Evolution of drizzle cells in SE Pacific stratocumulus (2003 - 31Radar) (Site not responding. Last check: 2007-10-08)
		Observations obtained in the SE Pacific stratocumulus region during EPIC 2001 are uniquely suited for addressing this issue.
		A case study of the evolution of drizzle cells is presented, using radar, sounding, meteorological, and satellite data.
		This synthesis of different types of measurements permits an integrated analysis of the drizzling stratocumulus in the context of the boundary layer dynamics.
	ams.confex.com /ams/32BC31R5C/techprogram/paper_63863.htm (152 words)

	NOAA ETL Numerical modeling of clouds (Site not responding. Last check: 2007-10-08)
		The model has three key componets: a dynamical model that resolves the large eddies; a microphysical model that resolves the aerosol and cloud drop size distributions; and a radiation model.
		These three components are coupled and therefore provide a powerful tool for investigating the complex interactions between dynamics, microphysics and radiation.
		Superimposed on the plot are wind vectors depicting the eddy structure.
	www.etl.noaa.gov /et2/research/clouds/eddy_simulation.html (596 words)

	MSN Encarta - Multimedia - Stratocumulus Clouds
		A layer of stratocumulus clouds covers the sky.
		Made of condensed water droplets, these clouds form below an altitude of 1.6 km (1 mi).
		Stratocumulus clouds usually have a lumpy or wavy formation and produce either no precipitation or just slight drizzle or snow.
	encarta.msn.com /media_461526203/Stratocumulus_Clouds.html (44 words)

	ABSTRACT CS_1989 (Site not responding. Last check: 2007-10-08)
		Thirty-three Landsat Thematic Mapper scenes of California stratocumulus cloud fields were acquired as part of the FIRE Marine Stratocumulus Intensive Field Observations in July 1987.
		Brightness variations in the stratocumulus region exhibit a -5/3 power-law decrease of the wavenumber spectra for scales larger than the cloud thickness, about 200 meters, changing to a -3 power at smaller scales.
		The -5/3 power suggests that for some purposes liquid water in turbulent stratocumulus clouds may be treated as a passive scalar, simply reflecting variations in vertical velocity.
	climate.gsfc.nasa.gov /~cahalan/Abstracts/CS_1989.html (190 words)

	Research Projects
		Stratocumulus clouds play an important role in controlling radiative heating within the earth/atmosphere system.
		Previous studies have shown that stratocumulus reflectivity increases with increasing concentrations of a subset of the atmospheric aerosol population known as the cloud condensation nuclei or CCN.
		Second, the vertical velocity field within stratocumulus is highly variable and therefore realistic descriptions of the activation requires model resolution in both the space and time domains which is currently not possible.
	www-das.uwyo.edu /research_projects.htm (4031 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		The first order effect of stratocumulus on this balance is measured in terms of cloud albedo, which is dependent on both cloud-microphysical as well as boundary-layer-scale properties.
		Over the years various investigators have hypothesized that changes in ambient soluble aerosol concentrations may have a climatically significant effect on globally averaged stratocumulus albedo---the so called aerosol indirect effect on climate.
		Of particular interest in this regard is the hypothesis that a reduction in ambient aerosol concentrations leads to fewer drops and more efficient precipitation formation which in turn generates thinner clouds and reduced cloud fraction.
	www.mmm.ucar.edu /sem/stevens.html (344 words)

	SHIPBOARD MONITORING OF STRATOCUMULUS CLOUD PROPERTIES IN THE PACS REGION (Site not responding. Last check: 2007-10-08)
		Radiative surface cooling associated with subtropical stratocumulus clouds and turbulent interfacial fluxes associated with stratocumulus boundary-layer dynamics are primary factors in producing the observed sea surface temperature structure of the Eastern Pacific.
		Whilst marine stratocumulus clouds have been heavily studied in the past, almost no data exists on clouds or air-sea fluxes in the PACS region.
		MBL stratocumulus clouds are observed at the beginning and latter half of the day.
	www.etl.noaa.gov /programs/pacs/pacs.html (2457 words)

	Catalog Page for PIA04349
		Similar to the ripples that occur when a pebble is thrown into a still pond, such "gravity waves" sometimes appear when the relatively stable and stratified air masses associated with stratocumulus cloud layers are disturbed by a vertical trigger from the underlying terrain, or by a thunderstorm updraft or some other vertical wind shear.
		The stratocumulus cellular clouds that underlie the wave feature are associated with sinking air that is strongly cooled at the level of the cloud-tops -- such clouds are common over mid-latitude oceans when the air is unperturbed by cyclonic or frontal activity.
		The Terra satellite is managed by NASA's Goddard Space Flight Center, Greenbelt, MD. JPL is a division of the California Institute of Technology.
	photojournal.jpl.nasa.gov /catalog/PIA04349 (276 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		A turbulence-condensation scheme for a stratocumulus-topped PBL which may be applied in mesoscale numerical weather prediction model is investigated.
		This approach is investigated for two vertical resolutions, 25 m (6-8 grid levels in the cloud) and 100 m (2 grid levels in the cloud).
		The results are compared with LES data which were generated for a simplified night-time stratocumulus case.
	www.misu.su.se /~alberts/night.html (332 words)

	Abstract: Intraseasonal Oscillation of the Stratocumulus Cloud Deck over the Southeast Pacific (Site not responding. Last check: 2007-10-08)
		A quasi-periodic intraseasional oscillation is detected from satellite observations of column-integrated cloud liquid water and EPIC buoy measurements of surface incoming solar radiation over the Southeast Pacific stratocumulus cloud deck.
		Power spectrum analysis of both cloud liquid water and surface solar radiation reveals two distinct peaks, one on the seasonal timescale and one on the intraseasonal timescale with periods of 40-50 days.
		The associated cold and dry advection enhances the stability of the PBL top and intensifies turbulence heat flux he ocean surface, conditions favorable for boundary layer cloud formation.
	www.physics.nmt.edu /~raymond/epic2001/sept2003abstracts/xu.html (133 words)

	MARINE STRATOCUMULUS METHODOLOGY
		During the Marine Stratocumulus IFO, data will be gathered to support high spatial and temporal resolution studies of marine stratocumulus cloud fields.
		The island is relatively small and minimally disrupts the marine boundary layer flow; climatological data show that the northwest tip of the island receives marine flow more that 60% of the time; maritime stratocumulus clouds occur approximately 38% of the time during the month of July.
		The Marine Stratocumulus IFO will be conducted over the eastern Pacific ocean off the southwest coast of California.
	asd-www.larc.nasa.gov /fire/FIRE_I/mar_strat_2.5.3.html (1073 words)

	[No title]
		Thick (opaque) stratocumulus clouds over a small lake in central Michigan.
		While it is difficult to determine cloud cover without a view straight up in a case like this, it appears to be an overcast cloud field.
		This is a good shot of very opaque (note the gray) and mostly cloudy stratocumulus.
	asd-www.larc.nasa.gov /cgi-bin/SCOOL_Clouds/Stratocumulus/list.cgi (104 words)

	Marine Stratocumulus Clouds (Site not responding. Last check: 2007-10-08)
		Boundary layer aspects of Marine Stratocumulus Clouds such as the breakup of stratocumulus clouds by Cloud-Top Entrainment Instability (CTEI), the transition from stratiform cloud to cumulus cloud, and turbulent fluxes in marine stratocumulus clouds are reviewed by Moeng and LeMone in this issue.
		Due to the recent field programs focussed on marine stratocumulus clouds (First ISCPP Regional Experiment (FIRE), summer 1987) and the Atlantic Stratocumulus Transition Experiment (ASTEX), a large number of papers have appeared in the literature on this cloud type.
		The study by Rogers and Koracin [1992] showed the effects of longwave and shortwave radiative heating on the coupling between stratocumulus clouds and the boundary layer using a one-dimensional (1-D) model of stratocumulus clouds.
	www.agu.org /revgeophys/rasmus00/node19.html (248 words)

	Clouds
		The cloud layers tend to be stratocumulus in form.
		Sometimes convection occurs in combination with the mechanical turbulence and then cumulus clouds will develop and will be embedded in the stratocumulus layer.
		If the air is very stable, the mechanical turbulence is dampened and confined to very low levels.
	www.allstar.fiu.edu /aero/fltenv3.htm (5148 words)

	Dual-wavelength radar measurements of stratocumulus
		One of the main problems in using radar to make quantitative measurements of stratocumulus is that the occasional large drizzle droplet (around 100 microns in diameter) can produce a large signal for the radar but contribute negligibly to liquid water content (LWC).
		However, attenuation is proportional to LWC and increases with frequency, so two colocated radars at different frequencies should be able to measure LWC by taking the dirivative with height of the Dual-wavelength ratio (DWR).
		This is much more difficult to validate because stratocumulus is very inhomogeneous and so exact coincidence with in situ aircraft measurements must be achieved.
	www.met.rdg.ac.uk /radar/research/dualfreq/lwc.html (415 words)

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