A statistical approach to radar rainfall estimates using polarimetric variables

You, Cheol‐Hwan; Kang, Miyoung; Hwang, Yoon Jung; Yee, Jurng-Jae; Jang, Myoung-Uoon; Lee, D.-I.

doi:10.1016/j.atmosres.2018.03.016

Cited by 7 publications

(9 citation statements)

References 25 publications

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“…Both results are consistent with the RSD average shown in Figure 6 and also with previous studies [41]. On the other hand, the black line indicates the curve obtained using Equation 6. [32] and [33], considering air density at 3330 amsl (HYO position).…”

Section: Of 21supporting

confidence: 91%

“…The Z-R relationship (Figure 9a,b) depends on the RSD, which is a consequence of microphysical processes involved in rain formation, which are related with the type of cloud, and regional, orographic, and seasonal factors [6]. It is expressed by Figure 9 shows the dependence of reflectivity on rainfall rate (a, b) and of fall velocity on diameter (c, d) for the rain events over the valley for the two rainfall types.…”

Section: Convective and Stratiform Rainfallmentioning

confidence: 99%

“…The Z-R relationship (Figure 9a,b) depends on the RSD, which is a consequence of microphysical processes involved in rain formation, which are related with the type of cloud, and regional, orographic, and seasonal factors [6]. It is expressed by an empirical equation (Z = aR b ) where a and b are parameters which can be derived from the RSD [5].…”

Section: Of 21mentioning

confidence: 99%

“…In the afternoon, clouds develop and drift to the east, over the Andean valleys and towards the Amazon, intensified by local orographic circulation. The opposite happens at night, when the stratiform rainfall is dominant and it is controlled by clouds, located in the Inter-Andean valley, generated by the convection fields formed over the Amazon forest.Atmosphere 2020, 11, 38 2 of 21 (ZDR), differential phase shift (Φ DP ), cross-correlation coefficient (ρ hv ) and the specific differential phase (K DP ) [6].RSD variation in a specific case depends on the precipitation regime, climatological conditions, and geographical location [7,8]. Two main rain types can be defined as convective and stratiform, depending on the rain's spatial and temporal distribution and related to the cloud systems originating them, even if frequently the same cloud system produces both types of rain in different stages of its development and in different areas, in the case of complex and long living systems [9].…”

mentioning

confidence: 99%

“…Atmosphere 2020, 11, 38 2 of 21 (ZDR), differential phase shift (Φ DP ), cross-correlation coefficient (ρ hv ) and the specific differential phase (K DP ) [6].…”

mentioning

confidence: 99%

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Diurnal Cycle of Raindrops Size Distribution in a Valley of the Peruvian Central Andes

et al. 2019

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In the Central Andes of Peru, convective and stratiform rainfall occurs, frequently associated with convective storms. The raindrop size distributions (RSD), measured by a Parsivel-2 optical disdrometer, were characterized by the variation of their normalized parameters. The RSD dataset includes measurements corresponding to 18 months between 2017 and 2019. As a result, it was found that the mass-weighted mean diameter Dm and the Nw parameter present respectively high and low values, in the interval of 15-20 LST (local standard time), wherein deeper and more active clouds appear. The events including convective rainfall contribute 67.5% of the accumulated total, wherein 92% corresponds to the 15-20 LST interval. It is concluded that the spectral variability of the RSD is strongly controlled by the cloudiness configuration field developing over the west (convection over highlands) and east (convection over Amazon) sides of the valley. In the afternoon, clouds develop and drift to the east, over the Andean valleys and towards the Amazon, intensified by local orographic circulation. The opposite happens at night, when the stratiform rainfall is dominant and it is controlled by clouds, located in the Inter-Andean valley, generated by the convection fields formed over the Amazon forest.Atmosphere 2020, 11, 38 2 of 21 (ZDR), differential phase shift (Φ DP ), cross-correlation coefficient (ρ hv ) and the specific differential phase (K DP ) [6].RSD variation in a specific case depends on the precipitation regime, climatological conditions, and geographical location [7,8]. Two main rain types can be defined as convective and stratiform, depending on the rain's spatial and temporal distribution and related to the cloud systems originating them, even if frequently the same cloud system produces both types of rain in different stages of its development and in different areas, in the case of complex and long living systems [9]. The relative weight of the different microphysical processes forming raindrops depends on the type of rainfall event. As convective rain originates in the updraft-downdraft circulation of convective clouds, a vigorous condensation-collision-coalescence process prevails in raindrop growth, producing high liquid water contents and relatively large drops, complemented with graupel and hail development by riming, which recycles in the vertical circulation, sometimes resulting in large raindrops in the rain shaft or hail on the ground [9,10]. In stratiform clouds, the vertical circulation is weaker, with slow and extended vertical ascent, favoring predominant steady drop growth by diffusion of water vapor into ice particles by the Bergeron-Findeisen process at temperatures below the melting point or vapor diffusion into droplets complemented by slow coalescence [9]. Meanwhile, the orographic component in the Andes is imposed as a forcing mechanism and the Andean clouds are deeper and more active than in neighboring areas as is the case for the transitional region between the Andes and the Amazon [11].Previo...

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Section: Of 21supporting

confidence: 91%

Section: Convective and Stratiform Rainfallmentioning

confidence: 99%

“…The Z-R relationship (Figure 9a,b) depends on the RSD, which is a consequence of microphysical processes involved in rain formation, which are related with the type of cloud, and regional, orographic, and seasonal factors [6]. It is expressed by an empirical equation (Z = aR b ) where a and b are parameters which can be derived from the RSD [5].…”

Section: Of 21mentioning

confidence: 99%

mentioning

confidence: 99%

“…Atmosphere 2020, 11, 38 2 of 21 (ZDR), differential phase shift (Φ DP ), cross-correlation coefficient (ρ hv ) and the specific differential phase (K DP ) [6].…”

mentioning

confidence: 99%

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