Aircraft measurements of wave clouds

Cui, Zhiqiang; Blyth, Alan; Bower, Keith; Crosier, Jonathan

doi:10.5194/acp-12-9881-2012

Cited by 9 publications

(8 citation statements)

References 53 publications

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“…It produces twodimensional images of particles in the cloud and counts and sizes particles from 10 mm to 1.3 mm, with a response time of 41 ns. Its greatly improved determination of sample volume and sizing of small particles less than 100 mm in diameter allows good measurements to be made of the development of drizzle (Crosier et al 2011;Crawford et al 2012;Cui et al 2012;Crosier et al 2014).…”

Section: Observationsmentioning

confidence: 99%

Observations of the Variation in Aerosol and Cloud Microphysics along the 20°S Transect on 13 November 2008 during VOCALS-REx

Cui

Gadian

Blyth

et al. 2014

Journal of the Atmospheric Sciences

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Observations are presented of the structure of the marine boundary layer (MBL) in the southeastern Pacific made with the U.K. BAe 146 aircraft on 13 November 2008 as it flew at a variety of altitudes along 208S between the coast of Chile and a buoy 950 km offshore during the Variability of American Monsoon Systems (VAMOS) Ocean-Cloud-Atmosphere-Land Study (VOCALS) Regional Experiment (REx). The purpose of the study is to determine the variations along the 208S transect in the clouds and boundary layer on this particular day as compared to the typical structure determined from the composite studies. The aircraft flew in three regions on this day: relatively continuous thick stratocumulus clouds, open cells, and closed cells. Results show three particular features. First, the results of the cloud microphysics are consistent with the typical behavior showing a decrease in aerosol particles by a factor of 3-4, and a decrease in cloud droplet number concentration westward from the coast from about 200 to 100 cm 23 or less with a corresponding increase in the concentration of drizzle drops with a maximum in open cells. Sulfate was dominant in the aerosol mass. Second, there was evidence of decoupling of the marine boundary layer that coincided with a change in the cloud type from stratiform to convective. The case differs from the average found in VOCALS in that the decoupling is not consistent with the deepening-warming idea. Precipitation is thought to possibly be the cause instead, suggesting that aerosol might play a controlling role in the cloud-boundary layer structure. Finally, cold pools were observed in the MBL from the dropsonde data.

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Section: Observationsmentioning

confidence: 99%

Observations of the Variation in Aerosol and Cloud Microphysics along the 20°S Transect on 13 November 2008 during VOCALS-REx

Cui

Gadian

Blyth

et al. 2014

Journal of the Atmospheric Sciences

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“…Kirkwood, et al, 2010;Kühnlein et al, 2013;Ehard et al, 2015), including, but not limited to, ground-based lidars and radars, airborne lidars and in situ sensors, balloons and satellites, the use of airborne Doppler wind lidars is unusual (Bluman and Hart, 1988). While horizontal wind measurements retrieved by airborne DWLs are frequently found in the literature (Reitebuch et al, 2001(Reitebuch et al, , 2003Weissmann et al, 2005;De Wekker et al, 2012;Kavaya et al, 2014), only a few high-resolution measurements of vertical winds are reported (Kiemle et al, 2007(Kiemle et al, , 2011Emmit and Godwin, 2014). Usually, DWLs provide measurements of the relative wind speed between the instrument and the sensed atmospheric volume every second.…”

Section: F Chouza Et Al: Vertical Wind Retrieved By Airborne Lidar mentioning

confidence: 99%

Vertical wind retrieved by airborne lidar and analysis of island induced gravity waves in combination with numerical models and in situ particle measurements

et al. 2016

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Abstract. This study presents the analysis of island induced gravity waves observed by an airborne Doppler wind lidar (DWL) during SALTRACE. First, the instrumental corrections required for the retrieval of high spatial resolution vertical wind measurements from an airborne DWL are presented and the measurement accuracy estimated by means of two different methods. The estimated systematic error is below −0.05 m s−1 for the selected case of study, while the random error lies between 0.1 and 0.16 m s−1 depending on the estimation method. Then, the presented method is applied to two measurement flights during which the presence of island induced gravity waves was detected. The first case corresponds to a research flight conducted on 17 June 2013 in the Cabo Verde islands region, while the second case corresponds to a measurement flight on 26 June 2013 in the Barbados region. The presence of trapped lee waves predicted by the calculated Scorer parameter profiles was confirmed by the lidar and in situ observations. The DWL measurements are used in combination with in situ wind and particle number density measurements, large-eddy simulations (LES), and wavelet analysis to determine the main characteristics of the observed island induced trapped waves.

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“…Contiguous with these two regions, there were three bands with warmer temperatures than expected at this altitude; these correspond to subsidence regions produced by the mountain waves. A wave cloud occurs between the maximum and minimum vertical velocity, where temperatures are less than the undisturbed mean value [ 73 ].…”

Section: Meteorological Analysismentioning

confidence: 99%

Weather Features Associated with Aircraft Icing Conditions: A Case Study

Fernández‐González

Sánchez

Gascón

et al. 2014

The Scientific World Journal

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In the context of aviation weather hazards, the study of aircraft icing is very important because of several accidents attributed to it over recent decades. On February 1, 2012, an unusual meteorological situation caused severe icing of a C-212-200, an aircraft used during winter 2011-2012 to study winter cloud systems in the Guadarrama Mountains of the central Iberian Peninsula. Observations in this case were from a MP-3000A microwave radiometric profiler, which acquired atmospheric temperature and humidity profiles continuously every 2.5 minutes. A Cloud Aerosol and Precipitation Spectrometer (CAPS) was also used to study cloud hydrometeors. Finally, ice nuclei concentration was measured in an isothermal cloud chamber, with the goal of calculating concentrations in the study area. Synoptic and mesoscale meteorological conditions were analysed using the Weather Research and Forecasting (WRF) model. It was demonstrated that topography influenced generation of a mesolow and gravity waves on the lee side of the orographic barrier, in the region where the aircraft experienced icing. Other factors such as moisture, wind direction, temperature, atmospheric stability, and wind shear were decisive in the appearance of icing. This study indicates that icing conditions may arise locally, even when the synoptic situation does not indicate any risk.

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Aircraft measurements of wave clouds

Cited by 9 publications

References 53 publications

Observations of the Variation in Aerosol and Cloud Microphysics along the 20°S Transect on 13 November 2008 during VOCALS-REx

Observations of the Variation in Aerosol and Cloud Microphysics along the 20°S Transect on 13 November 2008 during VOCALS-REx

Vertical wind retrieved by airborne lidar and analysis of island induced gravity waves in combination with numerical models and in situ particle measurements

Weather Features Associated with Aircraft Icing Conditions: A Case Study

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