Microphysical Properties of Snow and Their Link to Z(e)-S Relations during BAECC 2014

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http://hdl.handle.net/10138/308167

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von Lerber , A , Moisseev , D , Bliven , L F , Petersen , W , Harri , A-M & Chandrasekar , V 2017 , ' Microphysical Properties of Snow and Their Link to Z(e)-S Relations during BAECC 2014 ' , Journal of Applied Meteorology and Climatology , vol. 56 , no. 6 , pp. 1561-1582 . https://doi.org/10.1175/JAMC-D-16-0379.1

Title: Microphysical Properties of Snow and Their Link to Z(e)-S Relations during BAECC 2014
Author: von Lerber, Annakaisa; Moisseev, Dmitri; Bliven, Larry F.; Petersen, Walter; Harri, Ari-Matti; Chandrasekar, V.
Contributor organization: Department of Physics
Date: 2017-06
Language: eng
Number of pages: 22
Belongs to series: Journal of Applied Meteorology and Climatology
ISSN: 1558-8424
DOI: https://doi.org/10.1175/JAMC-D-16-0379.1
URI: http://hdl.handle.net/10138/308167
Abstract: This study uses snow events from the Biogenic Aerosols-Effects on Clouds and Climate (BAECC) 2014 campaign to investigate the connection between properties of snow and radar observations. The general hydrodynamic theory is applied to video-disdrometer measurements to retrieve masses of falling ice particles. Errors associated with the observation geometry and the measured particle size distribution (PSD) are addressed by devising a simple correction procedure. The value of the correction factor is determined by comparison of the retrieved precipitation accumulation with weighing-gauge measurements. Derived mass-dimensional relations are represented in the power-law form m = a(m)D(m)(b). It is shown that the retrieved prefactor a(m) and exponent b(m) react to changes in prevailing microphysical processes. From the derived microphysical properties, event-specific relations between the equivalent reflectivity factor Z(e) and snowfall precipitation rate S (Z(e) = a(zs)S(zs)(b)) are determined. For the studied events, the prefactor of the Z(e)-S relation varied between 53 and 782 and the exponent was in the range of 1.19-1.61. The dependence of the factors a(zs) and b(zs) on the m(D) relation and PSD are investigated. The exponent of the Z(e)-S relation mainly depends on the exponent of the m(D) relation, whereas the prefactor a(zs) depends on both the intercept parameter N-0 of the PSD and the prefactors of the m(D) and nu(D) relations. Changes in a(zs) for a given N-0 are shown to be linked to changes in liquid water path, which can be considered to be a proxy for degree of riming.
Subject: 2-DIMENSIONAL VIDEO DISDROMETER
PARTICLE TERMINAL VELOCITIES
RADAR REFLECTIVITY
FALL VELOCITY
HYDROMETEOR CLASSIFICATION
WINTER PRECIPITATION
SOLID PRECIPITATION
ICE PARTICLES
POWER LAWS
CRYSTALS
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by_nc_sa
Usage restriction: openAccess
Self-archived version: publishedVersion


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