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Disdrometer

About: Disdrometer is a research topic. Over the lifetime, 930 publications have been published within this topic receiving 23092 citations.


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Journal ArticleDOI
TL;DR: In this article, the development and evolution of precipitation microphysical parameters and the vertical structure characteristics associated with Typhoon Yagi (201814) are analyzed in the city of Jinan, Shandong Province based primarily on the observations of a micro rain radar (MRR), a cloud radar, and a disdrometer.
Abstract: The development and evolution of precipitation microphysical parameters and the vertical structure characteristics associated with Typhoon Yagi (201814) are analyzed in the city of Jinan, Shandong Province based primarily on the observations of a micro rain radar (MRR), a cloud radar, and a disdrometer. The precipitation process is further subdivided into four types: convective, stratiform, mixed, and light precipitation according to the ground disdrometer data, which is in agreement with the vertical profile of the radar reflectivity detected by the MRR. Vertical winds may be the main source of MRR retrieval error during convective precipitation. Convective precipitation has the shortest duration but makes the largest contribution to the cumulative precipitation. Collision-coalescence is the main microphysical process of stratiform precipitation and light precipitation below the bright band observed by the MRR. It is worth noting that as Typhoon Yagi (201814) transformed into an extratropical cyclone, its raindrop size distributions no longer had the characteristics of maritime precipitation, but become more typical of the characteristic of continental precipitation, which represents a very different raindrop size distribution from that which is normally observed in a landfalling typhoon.

3 citations

01 Jan 2004
TL;DR: In this paper, a long time record of drop size distributions (DSDs) is used to evaluate the effect of the DSD variability on the accuracy of radar calibratin by a) comparison with a rain gage on a daily basis and b) with polarimetric information.
Abstract: A long time record of drop size distributions (DSDs) is used to evaluate the effect of the DSD variability on the accuracy of radar calibratin by a) comparison with a rain gage on a daily basis and b) with polarimetric information. A calibration of reflectivity can be done if a disdrometer is available. Good correlations between radar and disdrometric reflectivities indicate that this could be an excellent way of calibrating radar on a daily basis. The information from operational S-band polarimetric radar is also used for calibration. The sensitivity of a polarimetric calibration with respect to the drop deformation is tested. Furthermore, the consistency in the disdrometric and polarimetric calibration suggests that the use of both calibrations allows to estimate the mean drop deformation. Key Words: Radar calibration, rain gage, disdrometer, operational polarimetric radar, drop size distributions (DSD), drop deformation Introduction When considering radar calibration there are several areas of interest. The stability of the electronic equipment is a concern in its own right. Possible effects of radome on the measurements are a problem that could depend on the state of the radome, whether dry, wet, or with rain streaks. In hydrological applications calibration of the radar may imply some adjustment with ground truth. The differences between the radar measurements and precipitation intensity at the ground may be caused by the height of the radar measurement coupled with the vertical profile of reflectivity, contamination by non-meteorological target, etc (Wilson and Brandes 1979; Zawadzki 1984). The transformation of radar reflectivity into rain rate is another source of discrepancy. Instead of adjusting radar information with ground truth, the radar calibration with radar data themselves is another possibility that can provide an independent monitoring of the performance of system. Due to its inherent characteristics, the specific differential phase shift

3 citations

16 Oct 2006
TL;DR: In this paper, a new software developed in order to extend the capabilities of a Thies Clima disdrometer is described, which is designed to analyze the raw data and create graphs of the statistical rain drop distributions.
Abstract: The disdrometer produced by Thies Clima measures rainfall and provides raw data to be processed in order to retrieve the desired information. The paper describes a new software developed in order to extend the capabilities of a Thies Clima disdrometer. The new application is designed to analyze the raw data and create graphs of the statistical rain drop distributions.

3 citations

Posted ContentDOI
TL;DR: In this paper , a comparative analysis of the measurement algorithms employed by each of the three digital video disdrometers by applying the algorithms to snowflake images captured by PIP during the ICEP-POP 2018 field campaign was performed.
Abstract: Abstract. Measurements of snowflake particle size and shape are important for studying the snow microphysics. While a number of instruments exist that are designed to measure these important parameters, this study focuses on the measurement techniques of three digital video disdrometers: the Precipitation Imaging Package (PIP), the Multi-Angle Snowflake Camera (MASC) and the Two-Dimensional Video Disdrometer (2DVD). To gain a better understanding of the relative strengths and weaknesses of these instruments and to provide a foundation upon which comparisons can be made between studies using data from different instruments, we perform a comparative analysis of the measurement algorithms employed by each of the three instruments by applying the algorithms to snowflake images captured by PIP during the ICEP-POP 2018 field campaign. Our analysis primarily focuses on the measurements of area, equivalent diameter, and aspect ratio. Our findings indicate that area and equi-area diameter measurements using the 2DVD camera setup should be the most accurate, followed by MASC, which is slightly more accurate than PIP. In terms of the precision of the area and equi-area diameter measurements, however, MASC is considerably more precise than PIP or 2DVD, which provide similar precision once the effects of the PIP image compression algorithm are taken into account. Both PIP and MASC use shape-fitting algorithms to measure aspect ratio. While our analysis of the MASC aspect ratio suggests the measurements are reliable, our findings indicate that both the ellipse and rectangle aspect ratios produced by PIP under-performed considerably due to the shortcomings of the PIP shape-fitting techniques. That said, we also demonstrate that reliable measurements of aspect ratio can be retrieved from PIP by reprocessing the PIP images using either the MASC shape-fitting technique or a tensor-based ellipse-fitting technique. Because of differences in instrument design, 2DVD produces measurements of particle horizontal and vertical extent rather than length and width. Furthermore, the 2DVD measurements of particle horizontal extent can be contaminated by horizontal particle motion. Our findings indicate that, although the correction technique used to remove the horizontal motion contamination performs remarkably well with snowflakes despite being designed for use with rain drops, the 2DVD measurements of particle horizontal extent are potentially unreliable.

3 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202378
2022114
202151
202059
201972
201840