A New Tethered Balloon-Borne Payload for Fine-Scale Observations in the Cloudy Boundary Layer

A new scientific payload is introduced for fine-scale measurements of meteorological (wind vector, static air temperature, humidity, and air pressure) and microphysical (aerosol particles and cloud droplets) properties, suspended below a tethered balloon. The high resolution sensors and the tethered balloon are described. Measurements in a lifted fog layer from a first field campaign are presented.The detailed investigation of the fog/haze and the temperature inversion layer demonstrates the damping influence of the fog on temperature fluctuations, while thewind fluctuations are significantly decreased by theevolving temperature inversion, whichwas about 30 m above the fog layer.From spectral analysis the noise floors of the high-resolution sensors are determined to10-6 kg m-3 for the LWC (liquid water content) and 4 mK for the fast temperature sensor (UFT-B). The correlation betweentemperature and LWC structures in shallow haze layers is investigated. The release of latent heat and the corresponding warming in the haze of about 0.1 K could be quantified.

[1]  meeting summary: Future Directions for Research on Meter- and Submeter-Scale Atmospheric Turbulence , 2001 .

[2]  P. R. Jonas,et al.  Turbulence and cloud microphysics , 1996 .

[3]  J. B. Williams,et al.  Atmospheric Research Using Kites: Here We Go Again! , 1992 .

[4]  William J. Plant,et al.  Measurements of the Marine Boundary Layer from an Airship , 1998 .

[5]  Turbulence structure in convective boundary layers and implications for diffusion , 1983 .

[6]  D. Lenschow,et al.  Measurements Of Fine-Scale Structure At The Top Of Marine Stratocumulus , 2000 .

[7]  Andreas Muschinski,et al.  First In Situ Evidence for Coexisting Submeter Temperature and Humidity Sheets in the Lower Free Troposphere , 1998 .

[8]  H. Siebert,et al.  Behaviour Of An Ultrasonic Anemometer Under Cloudy Conditions , 2000 .

[9]  R. Lawson,et al.  Performance of Some Airborne Thermometers in Clouds , 1990 .

[10]  Manfred Wendisch,et al.  Wind Tunnel Tests of the Airborne PVM-100A Response to Large Droplets , 2002 .

[11]  W. Plant,et al.  The Naval Research Laboratory's Air-Sea Interaction Blimp Experiment , 1989 .

[12]  David P. Duda,et al.  Microphysical and Radiative Properties of Marine Stratocumulus from Tethered Balloon Measurements , 1991 .

[13]  A. Wiedensohler,et al.  Particle counting efficiency of the TSI CPC 3762 for different operating parameters , 2001 .

[14]  Relevance of a Tuning-Fork Effect for Temperature Measurements with the Gill Solent HS Ultrasonic Anemometer–Thermometer , 2001 .

[15]  R. Likert.  “Technique for the Measurement of Attitudes, A” , 2022, The SAGE Encyclopedia of Research Design.

[16]  H. Gerber,et al.  Direct measurement of suspended particulate volume concentration and far-infrared extinction coefficient with a laser-diffraction instrument. , 1991, Applied optics.

[17]  H. Gerber,et al.  New microphysics sensor for aircraft use , 1994 .

[18]  J. Brenguier,et al.  Cumulus Entrainment and Cloud Droplet Spectra: A Numerical Model within a Two-Dimensional Dynamical Framework , 1993 .

[19]  Manfred Wendisch,et al.  An Airborne Spectral Albedometer with Active Horizontal Stabilization , 2001 .

[20]  S. Nicholls,et al.  An observational study of the structure of stratiform cloud sheets: Part I. Structure , 1986 .

[21]  Üllar Rannik,et al.  Vertical aerosol particle fluxes measured by eddy covariance technique using condensational particle counter , 1998 .

[22]  D. Cruette,et al.  Fast Temperature and True Airspeed Measurements with the Airborne Ultrasonic Anemometer–Thermometer (AUSAT) , 2000 .

[23]  S. Nicholls,et al.  An observational study of the structure of stratiform cloud sheets: Part II. Entrainment , 1986 .

[24]  Back to basics: Clouds and the earth's radiation budget , 1999 .

[25]  W. Cotton,et al.  Storm and Cloud Dynamics , 1992 .

[26]  J. Deardorff,et al.  On the use of Taylor's translation hypothesis for diffusion in the mixed layer , 1976 .

[27]  Andreas Muschinski,et al.  Fine-Scale Measurements Of Turbulence In The Lower Troposphere: An Intercomparison Between A Kite- And Balloon-Borne, And A Helicopter-Borne Measurement System , 2001 .

[28]  D. Lenschow,et al.  Dynamics and Chemistry of Marine Stratocumulus (DYCOMS) Experiment , 1988 .

[29]  D. Baumgardner,et al.  A Technique for the Measurement of Cloud Structure on Centimeter Scales , 1993 .

[30]  J W Birks,et al.  Vertical profiling of the atmosphere using high-tech kites. , 1994, Environmental science & technology.

[31]  An optical device for the measurement of liquid water content in clouds , 1984 .

[32]  Reinhold Busen,et al.  A New Ultrafast Thermometer for Airborne Measurements in Clouds , 1997 .

[33]  K. Trenberth,et al.  Earth's annual global mean energy budget , 1997 .

[34]  Observations of Cloud Microstructure at the Centimeter Scale , 1993 .

[35]  Klaus Willeke,et al.  Aerosol Measurement: Principles, Techniques, and Applications , 2001 .

[36]  H. Gerber,et al.  Liquid Water Content of Fogs and Hazes from Visible Light Scattering , 1984 .

[37]  H. Gerber,et al.  Spectral Density of Cloud Liquid Water Content at High Frequencies , 2001 .