Simulated Kelvin–Helmholtz Waves over Terrain and Their Microphysical ImplicationsSource: Journal of the Atmospheric Sciences:;2018:;volume 075:;issue 008::page 2787DOI: 10.1175/JAS-D-18-0073.1Publisher: American Meteorological Society
Abstract: AbstractTwo Kelvin?Helmholtz (KH) wave events over western Washington State were simulated and evaluated using observations from the Olympic Mountains Experiment (OLYMPEX) field campaign. The events, 12 and 17 December 2015, were simulated realistically by the WRF-ARW Model, duplicating the mesoscale environment, location, and structure of embedded KH waves, which had observed wavelengths of approximately 5 km. In simulations of both cases, waves developed from instability within an intense shear layer, caused by low-level easterly flow surmounted by westerly winds aloft. The low-level easterlies resulted from blocking by the Olympic Mountains in the 12 December case, while in the 17 December event, the easterly flow was produced by the synoptic environment. Simulated microphysics were evaluated for both cases using OLYMPEX observations. When the KH waves were within the melting level, simulated microphysical fields, such as hydrometeor mixing ratios, evinced considerable oscillatory behavior. In contrast, when waves were located below the melting level, the microphysical response was attenuated. Turning off the model?s microphysics scheme and latent heating resulted in weakened KH wave activity, while removing the Olympic Mountains eliminated KH waves in the 12 December event but not the 17 December case. Finally, the impact of several microphysics parameterizations on KH activity was evaluated for both events.
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contributor author | Conrick, Robert | |
contributor author | Mass, Clifford F. | |
contributor author | Zhong, Qi | |
date accessioned | 2019-09-19T10:08:06Z | |
date available | 2019-09-19T10:08:06Z | |
date copyright | 7/2/2018 12:00:00 AM | |
date issued | 2018 | |
identifier other | jas-d-18-0073.1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4261923 | |
description abstract | AbstractTwo Kelvin?Helmholtz (KH) wave events over western Washington State were simulated and evaluated using observations from the Olympic Mountains Experiment (OLYMPEX) field campaign. The events, 12 and 17 December 2015, were simulated realistically by the WRF-ARW Model, duplicating the mesoscale environment, location, and structure of embedded KH waves, which had observed wavelengths of approximately 5 km. In simulations of both cases, waves developed from instability within an intense shear layer, caused by low-level easterly flow surmounted by westerly winds aloft. The low-level easterlies resulted from blocking by the Olympic Mountains in the 12 December case, while in the 17 December event, the easterly flow was produced by the synoptic environment. Simulated microphysics were evaluated for both cases using OLYMPEX observations. When the KH waves were within the melting level, simulated microphysical fields, such as hydrometeor mixing ratios, evinced considerable oscillatory behavior. In contrast, when waves were located below the melting level, the microphysical response was attenuated. Turning off the model?s microphysics scheme and latent heating resulted in weakened KH wave activity, while removing the Olympic Mountains eliminated KH waves in the 12 December event but not the 17 December case. Finally, the impact of several microphysics parameterizations on KH activity was evaluated for both events. | |
publisher | American Meteorological Society | |
title | Simulated Kelvin–Helmholtz Waves over Terrain and Their Microphysical Implications | |
type | Journal Paper | |
journal volume | 75 | |
journal issue | 8 | |
journal title | Journal of the Atmospheric Sciences | |
identifier doi | 10.1175/JAS-D-18-0073.1 | |
journal fristpage | 2787 | |
journal lastpage | 2800 | |
tree | Journal of the Atmospheric Sciences:;2018:;volume 075:;issue 008 | |
contenttype | Fulltext |