Collision, Coalescence and Breakup of Raindrops. Part II: Parameterization of Fragment Size Distributions

Low, T. B.; List, Roland

doi:10.1175/1520-0469(1982)039<1607:ccabor>2.0.co;2

Cited by 123 publications

(94 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The detailed numerical studies of Hu and Srivastava (1995), based in part on the Low and List (1982) drop breakup parameterizations, show that the classical equilibrium DSD shape gives too high a slope (6.5 mm 21 ) at the larger diameters compared with observations (2.0-2.5 mm 21 ); these slopes correspond to D 0 values (for gamma DSDs with shape parameter m 5 3) of 1 mm and 2.6-3.3 mm, respectively. One of Hu and Srivastava's conclusions was that ''.…”

Section: Resultsmentioning

confidence: 97%

Do We Observe Aerosol Impacts on DSDs in Strongly Forced Tropical Thunderstorms?

May

Bringi

Thurai

2011

Journal of the Atmospheric Sciences

View full text Add to dashboard Cite

Rain drop size distributions retrieved from polarimetric radar measurements over regularly occurring thunderstorms over the islands north of Darwin, Australia, are used to test if aerosol contributions to the probability distributions of the drop size distribution parameters (median volume diameter and normalized intercept parameter) are detectable. The observations reported herein are such that differences in cloud properties arising from thermodynamic differences are minimized but even so may be a factor. However, there is a clear signature that high aerosol concentrations are correlated with smaller number concentrations and larger drops. This may be associated with enhanced ice multiplication processes for low aerosol concentration storms or other processes such as invigoration of the updrafts.

show abstract

Section: Resultsmentioning

confidence: 97%

Do We Observe Aerosol Impacts on DSDs in Strongly Forced Tropical Thunderstorms?

May

Bringi

Thurai

2011

Journal of the Atmospheric Sciences

View full text Add to dashboard Cite

show abstract

“…Also seen were decreases in the smaller drops without corresponding increases in larger drops, showing possible cases of evaporation. According to Low and List (1982b), if the drops of size smaller than 0.6 mm are struck by larger drops, they will coalesce. This was very clear in our present study; that is, small drops (< 0.6 mm diameter) had been reduced as the rain descended.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Altitudinal and temporal evolution of raindrop size distribution observed over a tropical station using a K-band radar

Harikumar

Sampath

Kumar

2011

International Journal of Remote Sensing

View full text Add to dashboard Cite

Rain drop size distribution (DSD) measurements at different heights were made using a micro rain radar (MRR) at Thiruvananthapuram (latitude: 8.3 • N, longitude: 76.9 • E). Rain DSD data obtained from the MRR have been compared with a Joss-Waldvogel impact-type disdrometer (RD-80) deployed nearby and found to have good agreement. The analysis uses data collected during 16 continuous rainfall episodes during the southwest monsoon (June to September, JJAS) season. Since all the episodes behaved similarly, a single continuous rainfall episode occurring from 1610:01 to 1612:31 hours Indian Standard Time (IST) on 12 August 2006 is presented here. The fall velocity of those drops that contributed most to the rain rate was more or less constant at different altitudes and also with time during this episode, and the average value was 4.65 m s −1 . The rain rate (RR) was below 5 mm h −1 for all the heights throughout the time. At the beginning of the rain episode, the number of drops at any given altitude was lower for larger drops. But towards the end of the episode, the number of drops in the smallest size class had reduced at almost all heights, whereas the number of drops in the larger size classes had increased. This suggests that the larger drops coming from above on colliding with smaller drops could coalesce, thus sweeping out the smaller drops as they fall. The reduction of small drops is seen with a corresponding increase in larger drops and without increase also during the course of a rainfall event. The former is an indication of coalescence while the latter is that of evaporation. All these observed phenomena in the natural rain support the observations made by Low and List in 1982.

show abstract

“…The ventilation factor f (D) is given by with a ϭ 0.78, b ϭ 0.308, N Sc ϭ 0.71, and N Re ϭ r D/ a , where a ϭ the kinematic viscosity of air (Pruppacher and Klett 1997 Here C is the coalescence kernel, K the collection kernel, B the breakup kernel, and P the breakup or fragment distribution function (see, e.g., Hu and Srivastava 1995;Pruppacher and Klett 1997). To specify these functions, the collision efficiencies of Pinsky et al (2001) are used as well as several parameterizations of coalescence and breakup (Low and List 1982;Beard and Ochs 1995;Brown 1997). A detailed description of the applied breakup scheme is given in Seifert et al (2005).…”

Section: ͑4͒mentioning

confidence: 99%

On the Parameterization of Evaporation of Raindrops as Simulated by a One-Dimensional Rainshaft Model

Seifert

2008

Journal of the Atmospheric Sciences

117

125

View full text Add to dashboard Cite

The process of evaporation of raindrops below cloud base is investigated by numerical simulations using a one-dimensional rainshaft model with bin microphysics. The simulations reveal a high variability of the shape of the raindrop size distributions, which has important implications for the efficiency of evaporation below cloud base.A new parameterization of the shape of the raindrop size distribution as a function of the mean volume diameter is suggested and applied in a two-moment microphysical scheme. In addition, the effect of evaporation on the number concentration of raindrops is parameterized. A comparison of results of the revised two-moment scheme and the bin microphysics rainshaft model shows that the two-moment scheme is able to reproduce the results of the reference model in a wide parameter range.

show abstract

Collision, Coalescence and Breakup of Raindrops. Part II: Parameterization of Fragment Size Distributions

Cited by 123 publications

References 0 publications

Do We Observe Aerosol Impacts on DSDs in Strongly Forced Tropical Thunderstorms?

Do We Observe Aerosol Impacts on DSDs in Strongly Forced Tropical Thunderstorms?

Altitudinal and temporal evolution of raindrop size distribution observed over a tropical station using a K-band radar

On the Parameterization of Evaporation of Raindrops as Simulated by a One-Dimensional Rainshaft Model

Contact Info

Product

Resources

About