Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.11765/11396
Simulation of atmospheric microbursts using a numerical mesoscale model at high spatiotemporal resolution
Title: Simulation of atmospheric microbursts using a numerical mesoscale model at high spatiotemporal resolution
Authors: Bolgiani, PedroFernández-González, Sergio ORCID RESEARCHERID SCOPUSID Autor AEMETValero Rodríguez, FranciscoMerino Suances, AndrésGarcía Ortega, EduardoSánchez Gómez, José LuisMartín Pérez, María Luisa
Keywords: Deep convection; Downburst; High‐reflectivity microburst; Numerical simulation; WRF; Numerical mesoscale model
Issue Date: 2020
Publisher: American Geophysical Union
Citation: Journal of Geophysical Research: Atmospheres. 2020, 125(4), p. 1-23
Publisher version: https://dx.doi.org/10.1029/2019JD031791
Abstract: Atmospheric microbursts are low‐level meteorological events that can produce significant damage on the surface and pose a major risk to aircraft flying close to the ground. Studies and ad hoc numerical models have been developed to understand the origin and dynamics of the microburst; nevertheless, there are few researches of the phenomenon using global and mesoscale models. This is mainly due to the limitations in resolution, as microbursts normally span for less than 4 km and 20 min. In this paper, the Weather esearch and Forecasting model is used at resolutions of 400 m and 3 min to test if it can properly capture the variables and dynamics of high‐reflectivity microbursts. Several microphysics and planetary boundary layer parametrizations are tested to find the best model configuration for the simulation of this kind of episodes. General conditions are evaluated by using thermodynamic diagrams. Surface and vertical wind speed, reflectivity, precipitation, and other variables for each simulated event are compared with observations, and the model's sensitivity to the variables is assessed. The dynamics and evolution of the microburst is evaluated using different plots of a chosen event. The results show that the model is able to reproduce high‐reflectivity microbursts in accordance with observations, although there is a tendency to underestimate the intensity of variables, most markedly on the wind vertical velocity. Regarding the microphysics schemes, the Morrison parametrization performs better than the WRF single‐moment 6‐class scheme. No major differences are found between the Mellor‐Yamada‐Janjic and the Mellor‐Yamada‐Nakanishi‐Niino planetary boundary layer parametrizations.
Sponsorship : This work is supported by the Interdisciplinary Mathematics Institute of the Complutense University of Madrid and the following research projects: METEORISK (RTC‐2014‐1872‐5), PCIN‐2014‐013‐C07‐04, PCIN‐2016‐080 (UE ERANET Plus NEWA Project), ESP2013‐47816‐C4‐4‐P, CGL2010‐15930, CGL2016‐81828‐REDT, FEI‐EU‐17‐16, and SAFEFLIGHT GL2016‐78702‐C2‐1‐R and CGL2016‐78702‐C2‐2‐R). This research is founded by the Spanish Ministry of Economy and Enterprise under the framework of the SAFEFLIGHT research project (CGL2016‐78702‐C2‐1‐R and CGL2016‐78702‐C2‐2‐R).
URI: http://hdl.handle.net/20.500.11765/11396
ISSN: 2169-897X
2169-8996
Appears in Collections:Artículos científicos 2019-2021


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