Ein Spektrograph für Niederschlagstropfen mit automatischer Auswertung

Joss, J.; Waldvogel, A.

doi:10.1007/bf00874898

Cited by 374 publications

(143 citation statements)

References 3 publications

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“…1 were performed for the mean bin sizes (shown as symbols in Fig. 1) of a typical impact-type Joss-Waldvogel disdrometer (JWD) that is often used to measure rain DSD spectra (Joss and Waldvogel 1967). It can be seen from the presented calculations and a power-law approximation that R ϳ ͗D 3.68 ͘.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Rainfall Profiling Using Atmospheric Radiation Measurement Program Vertically Pointing 8-mm Wavelength Radars

Matrosov

May

Shupe

2006

Journal of Atmospheric and Oceanic Technology

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An attenuation-based method to retrieve vertical profiles of rainfall rate from vertically pointing K a -band radar measurements has been refined and adjusted for use with the U.S. Department of Energy's cloud radars deployed at multiple Atmospheric Radiation Program (ARM) test bed sites. This method takes advantage of the linear relationship between the rainfall rate and the attenuation coefficient, and can account for a priori information about the vertical profile of nonattenuated reflectivity. The retrieval method is applied to a wide variety of rainfall events observed at different ARM sites ranging from stratiform events with low-to-moderate rainfall rates (ϳ5 mm h Ϫ1 ) to heavy convective rains with rainfall rates approaching 100 mm h Ϫ1 . The K a -band attenuation-based retrieval results expressed in both instantaneous rainfall rates and in rainfall accumulations are compared to available surface data and measurements of a scanning C-band precipitation polarimetric radar located near the Darwin, Australia, ARM test bed site. The K a -band retrievals are found to be in good agreement with the C-band radar estimates, which are based both on conventional radar reflectivity approaches and on polarimetric differential phase shift measurements. Typically, the C-band-K a -band radar estimate differences are within the expected retrieval uncertainties. The magnitude of the K a -band rainfall-rate estimate error depends on the retrieval resolution, rain intensity, and uncertainties in the profiles of nonattenuated reflectivity. It is shown that reasonable retrieval accuracies (ϳ15%-40%) can be achieved for a large dynamic range of observed rainfall rates (4-100 mm h Ϫ1 ) and the effective vertical resolution of about 1 km. The potential enhancements of the K a -band attenuation-based method by including a priori information on vertical profiles of nonattenuated reflectivity and increasing the height range of the retrievals by using K a -band polarization measurements are also discussed. The addition of the precipitation products to the suite of ARM hydrometeor retrievals can enhance the overall characterization of the vertical atmospheric column.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Rainfall Profiling Using Atmospheric Radiation Measurement Program Vertically Pointing 8-mm Wavelength Radars

Matrosov

May

Shupe

2006

Journal of Atmospheric and Oceanic Technology

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“…For such purposes, the drop fluxes must be transformed into estimates of drop concentrations which are done by assuming that drops fall at their terminal velocities [Joss and Waldvogel, 1967]. These transformations then yield drop size distributions which can be integrated to estimate other parameters such as the radar reflectivity factor (Z).…”

Section: Introductionmentioning

confidence: 99%

Further evidence for superterminal raindrops

Larsen

Kostinski

Jameson³

2014

Geophysical Research Letters

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A network of optical disdrometers (including laser precipitation monitors and a two-dimensional video disdrometer) was utilized to determine whether the recent reports of "superterminal" raindrops were spurious results of drop breakup occurring on instrumentation. Results unequivocally show that superterminal raindrops at small (less than 1 mm) sizes are ubiquitous, are measurable over an extended area, and appear in every rain event investigated. No evidence was found to suggest that superterminal drops are the result of drop breakup due to impact with the measurement instrument; thus, if the superterminal drops are the result of drop fragmentation, this fragmentation happens in the ambient atmosphere during all rain events measured in this study. The ubiquity of superterminal drops at small drop sizes raises natural questions regarding rain accumulation estimations, estimates of drop size distributions, and erosion characterization.

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“…Ces 2 dispositifs ayant déjà fait l'objet de nombreuses descriptions (entre autre Joss-Waldvogel, 1967;Waldvogel, 1974pour le disdromètre et Donnadieu, 1978, 1980 Remarque: y est vérifiable avec un bon accord. On voit aussi, vers 17 h 27 et 17 h 34, les 2 changements rapides et importants des spectres des gouttes qui ont fait l'objet d'un précédent article (Donnadieu, 1982).…”

Section: Introductionunclassified

Translation et rotation des spectres des gouttes de pluie dans des averses de nuages stratiformes et de nuages convectifs

Donnadieu

1983

La Houille Blanche

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Ein Spektrograph für Niederschlagstropfen mit automatischer Auswertung

Cited by 374 publications

References 3 publications

Rainfall Profiling Using Atmospheric Radiation Measurement Program Vertically Pointing 8-mm Wavelength Radars

Rainfall Profiling Using Atmospheric Radiation Measurement Program Vertically Pointing 8-mm Wavelength Radars

Further evidence for superterminal raindrops

Translation et rotation des spectres des gouttes de pluie dans des averses de nuages stratiformes et de nuages convectifs

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