Searched for: author%3A%22Unal%2C+C.M.H.%22
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Gatidis, C. (author), Schleiss, M.A. (author), Unal, C.M.H. (author)
In this study, we take a closer look at the important issue of μ–Λ relationships in raindrop size distributions (DSDs) by conducting a systematic analysis of 20 months of data collected by disdrometers in the Netherlands. A new power-law model for representing μ–Λ relationships based on the double normalization framework is proposed and used to...
journal article 2024
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Dias Neto, J. (author), Nuijens, Louise (author), Unal, C.M.H. (author), Knoop, S.A.G. (author)
This paper introduces an experimental setup for retrieving horizontal wind speed and direction profiles with a high temporal and vertical resolution for process studies and validation of convection-permitting model simulations. The CMTRACE (tracing convective momentum transport in complex cloudy atmospheres) campaign used collocated wind lidar...
journal article 2023
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Yanovsky, Felix J. (author), Pitertsev, Aleksander A. (author), Unal, C.M.H. (author), Russchenberg, H.W.J. (author)
This paper is devoted to discussing peculiarities of W-band cloud radar calibration. After a brief overview of meteorological radar calibration methods for quantitative information retrieval, we focus on problems and their possible solutions with respect to mm-wave radar calibration. The experimental part of the research is based on multi...
conference paper 2023
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Dias Neto, J. (author), Nuijens, Louise (author), Unal, C.M.H. (author), Knoop, Steven (author)
Convective clouds may be associated with substantial transport of momentum. Much of what we know about convective momentum transport stems from high-resolution simulations because high-resolution measurements of the wind profile are rare. This study exploits ground-based remote sensing techniques to visualize wind below and within clouds and...
poster 2022
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Gatidis, C. (author), Schleiss, M.A. (author), Unal, C.M.H. (author)
Raindrop size distributions (DSDs) play a crucial role in quantitative rainfall estimation using weather radar. Thanks to dual polarization capabilities, crucial information about the DSD in a given volume of air can be retrieved. One popular retrieval method assumes that the DSD can be modeled by a constrained gamma distribution in which the...
journal article 2022
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Chen, Cheng (author), Unal, C.M.H. (author), Oude Nijhuis, A.C.P. (author)
An effective filtering technique is required for rainfall rate measurement by weather radar. A Jensen–Shannon distance (JSD)-based thresholding filter is proposed to mitigate nonmeteorological signals, either in clear air or rain situations. This algorithm classifies range-Doppler bins into two classes, hydrometeors and nonhydrometeors, based on...
journal article 2022
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Yin, Jiapeng (author), Hoogeboom, P. (author), Unal, C.M.H. (author), Russchenberg, H.W.J. (author)
Radio frequency interference (RFI) has become a growing concern for weather radar, distorting radar variable estimation. By simultaneously or alternately transmitting the horizontal and vertical polarized waves, polarimetric weather radar can be referred to as SHV radar or AHV radar. The SHV radar can mimic the AHV radar by discarding either...
journal article 2021
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Gatidis, C. (author), Schleiss, M.A. (author), Unal, C.M.H. (author), Russchenberg, H.W.J. (author)
The adequacy of the gamma model to describe the variability of raindrop size distributions (DSD) is studied using observations from an optical disdrometer. Model adequacy is checked using a combination of Kolmogorov–Smirnov goodness-of-fit test and Kullback–Leibler divergence and the sensitivity of the results to the sampling resolution is...
journal article 2020
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Yin, Jiapeng (author), Hoogeboom, P. (author), Unal, C.M.H. (author), Russchenberg, H.W.J. (author), van der Zwan, W.F. (author), Oudejans, Erik (author)
Weather radar is well recognized as an effective sensor for obtaining the microphysical and dynamical properties of precipitation at high spatial and temporal resolution. Radar calibration is one of the most important prerequisites for achieving accurate observations. In this article, a portable, cost-effective and repeatable radar calibration...
journal article 2019
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Oude Nijhuis, A.C.P. (author), Unal, C.M.H. (author), Krasnov, O.A. (author), Russchenberg, H.W.J. (author), Yarovoy, Alexander (author)
In this article, five velocity-based energy dissipation rate (EDR) retrieval techniques are assessed. The EDR retrieval techniques are applied to Doppler measurements from Transportable Atmospheric Radar (TARA)—a precipitation profiling radar—operating in the vertically fixed-pointing mode. A generalized formula for the Kolmogorov constant is...
journal article 2019
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Reinoso Rondinel, R. (author), Unal, C.M.H. (author), Russchenberg, H.W.J. (author)
In radar polarimetry, the differential phase CDP consists of the propagation differential phase FDP and the backscatter differential phase dhv. While FDP is commonly used for attenuation correction (i.e., estimation of the specific attenuation A and specific differential phase KDP), recent studies have demonstrated that dhv can provide...
journal article 2018
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Pfitzenmaier, L. (author), Unal, C.M.H. (author), Dufournet, Yann (author), Russchenberg, H.W.J. (author)
The growth of ice crystals in presence of supercooled liquid droplets represents the most important process for precipitation formation in the mid-latitudes. However, such mixed-phase interaction processes remain relatively unknown, as capturing the complexity in cloud dynamics and microphysical variabilities turns to be a real observational...
journal article 2018
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Reinoso Rondinel, R. (author), Unal, C.M.H. (author), Russchenberg, H.W.J. (author)
One of the most beneficial polarimetric variables may be the specific differential phase K<sub>DP</sub> because of its independence from power attenuation and radar miscalibration. However, conventional K<sub>DP</sub> estimation requires a substantial amount of range smoothing as a result of the noisy characteristic of the measured...
journal article 2018
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Yin, J. (author), Unal, C.M.H. (author), Schleiss, M.A. (author), Russchenberg, H.W.J. (author)
A novel algorithm is put forward to separate radar target and moving clutter based on a combination of the low-rank matrix optimization (LRMO) and the decision tree. Similar to the moving object detection in the field of automated video analysis, the proposed separation method, which is carried out in the range-Doppler domain, makes use of...
journal article 2018
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Yin, J. (author), Unal, C.M.H. (author), Russchenberg, H.W.J. (author)
Aiming at removing stationary and moving clutter while retaining precipitation for dual-polarization weather radar, a new clutter suppression method, named the object-orientated spectral polarimetric (OBSpol) filter, is put forward in this paper. Based on the spectral polarimetric feature and the range-Doppler continuity of precipitation, the...
journal article 2018
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Yin, J. (author), Unal, C.M.H. (author), Russchenberg, H.W.J. (author)
In this paper, a new clutter suppression method, named the moving double spectral linear depolarization ratio (MDsLDR) filter, is put forward to mitigate narrow-band clutter in weather radars. The narrow-band clutter observed in the Doppler domain includes: 1) stationary clutter such as ground clutter and 2) nonstationary clutter such as...
journal article 2017
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Yin, J. (author), Krasnov, O.A. (author), Unal, C.M.H. (author), Medagli, S. (author), Russchenberg, H.W.J. (author)
Wind turbine clutter has gradually become a concern for the radar community for its increasing size and quantity worldwide. Based on the S-band polarimetric Doppler PARSAX radar measurements, this paper demonstrates the micro-Doppler features and spectral-polarimetric characteristic of wind turbine clutter, the probability distribution functions...
conference paper 2017
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Pfitzenmaier, L. (author), Dufournet, Y. (author), Unal, C.M.H. (author), Russchenberg, H.W.J. (author)
The interaction of ice crystals with supercooled liquid droplets in mixed-phase clouds leads to an enhanced growth of ice particles. However, such processes are still not clearly understood although they are important processes for precipitation formation in midlatitudes. To better understand how ice particles grow within such clouds, changes...
journal article 2017
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Yin, J. (author), Unal, C.M.H. (author), Russchenberg, H.W.J. (author)
For the polarimetric-Doppler weather radar, sometimes there are artifacts caused by radar system itself or external sources displaying in the radar plan position indicator (PPI). These artifacts are not confined to specific range bins and also they are non-stationary when observed in the Doppler domain. This paper puts forward a method to...
conference paper 2017
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Oude Nijhuis, A.C.P. (author), Krasnov, O.A. (author), Unal, C.M.H. (author), Russchenberg, H.W.J. (author), Yarovoy, A. (author)
conference paper 2015
Searched for: author%3A%22Unal%2C+C.M.H.%22
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