Investigating Arctic Cyclone-Tropopause Polar Vortex Interactions with Observing System Simulation Experiments

Tropopause polar vortices (TPVs) are upper-level cyclonic circulations that are common in high latitudes. TPVs most directly impact weather at the surface by providing baroclinic forcing for the development of Arctic cyclones (ACs), surface low-pressure systems over the Arctic Ocean and surrounding...

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Main Author: Bray, Matthew
Other Authors: Cavallo, Steven, Parsons, David, Wang, Xuguang
Language:English
Published: 2023
Subjects:
Online Access:https://shareok.org/handle/11244/337606
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spelling ftoklahomaunivs:oai:shareok.org:11244/337606 2023-06-11T04:08:52+02:00 Investigating Arctic Cyclone-Tropopause Polar Vortex Interactions with Observing System Simulation Experiments Bray, Matthew Cavallo, Steven Parsons, David Wang, Xuguang 2023-05-12 application/octet-stream application/pdf https://shareok.org/handle/11244/337606 en_US eng OU Thesis and Dissertation Collections https://shareok.org/handle/11244/337606 Atmospheric Sciences Meteorology Geophysical Fluid Dynamics Polar Studies 2023 ftoklahomaunivs 2023-05-11T17:28:23Z Tropopause polar vortices (TPVs) are upper-level cyclonic circulations that are common in high latitudes. TPVs most directly impact weather at the surface by providing baroclinic forcing for the development of Arctic cyclones (ACs), surface low-pressure systems over the Arctic Ocean and surrounding landmasses. ACs, in turn, help to drive the Arctic heat and moisture budgets via transport from the midlatitudes and govern sea ice variability on short timescales via dynamic and thermodynamic influences. Although prior studies have demonstrated and examined the link between TPVs and ACs, the exact role played by the TPV and its characteristics in the development of the surface cyclone has yet to be established. In the present study, we seek to take a step forward toward closing this gap using an idealized observing system simulation experiment (OSSE). This approach involves simulating dense dropsondes over a TPV as a surface cyclone is forming and examining the changes that the additional observations produce to the TPV and resulting surface cyclone. The ECMWF Cubic Octahedral grid Nature Run (ECO1280) is taken as the truth for the OSSE (all observations are simulated from the output of this model), and the Model for Prediction Across Scales (MPAS) is coupled with the Data Assimilation Research Testbed's (DART) ensemble adjustment Kalman filter in order to run numerical experiments. It is expected that the development of the TPV and surface cyclone will be especially sensitive to moisture observations, which influence TPV strength via diabatic processes, and that proper representation of mesoscale dynamic features along the tropopause will be key to accurate forecasts. In addition to a control in which only existing observations are simulated from ECO1280, we conduct four primary experiments assimilating additional dropsonde observations of (1) temperature, (2) humidity, (3) temperature and humidity, and (4) temperature and humidity over a broad region. All of the experiments reduce errors relative to the control ... Other/Unknown Material Arctic Arctic Ocean Sea ice University of Oklahoma/Oklahoma State University: SHAREOK Repository Arctic Arctic Ocean
institution Open Polar
collection University of Oklahoma/Oklahoma State University: SHAREOK Repository
op_collection_id ftoklahomaunivs
language English
topic Atmospheric Sciences
Meteorology
Geophysical Fluid Dynamics
Polar Studies
spellingShingle Atmospheric Sciences
Meteorology
Geophysical Fluid Dynamics
Polar Studies
Bray, Matthew
Investigating Arctic Cyclone-Tropopause Polar Vortex Interactions with Observing System Simulation Experiments
topic_facet Atmospheric Sciences
Meteorology
Geophysical Fluid Dynamics
Polar Studies
description Tropopause polar vortices (TPVs) are upper-level cyclonic circulations that are common in high latitudes. TPVs most directly impact weather at the surface by providing baroclinic forcing for the development of Arctic cyclones (ACs), surface low-pressure systems over the Arctic Ocean and surrounding landmasses. ACs, in turn, help to drive the Arctic heat and moisture budgets via transport from the midlatitudes and govern sea ice variability on short timescales via dynamic and thermodynamic influences. Although prior studies have demonstrated and examined the link between TPVs and ACs, the exact role played by the TPV and its characteristics in the development of the surface cyclone has yet to be established. In the present study, we seek to take a step forward toward closing this gap using an idealized observing system simulation experiment (OSSE). This approach involves simulating dense dropsondes over a TPV as a surface cyclone is forming and examining the changes that the additional observations produce to the TPV and resulting surface cyclone. The ECMWF Cubic Octahedral grid Nature Run (ECO1280) is taken as the truth for the OSSE (all observations are simulated from the output of this model), and the Model for Prediction Across Scales (MPAS) is coupled with the Data Assimilation Research Testbed's (DART) ensemble adjustment Kalman filter in order to run numerical experiments. It is expected that the development of the TPV and surface cyclone will be especially sensitive to moisture observations, which influence TPV strength via diabatic processes, and that proper representation of mesoscale dynamic features along the tropopause will be key to accurate forecasts. In addition to a control in which only existing observations are simulated from ECO1280, we conduct four primary experiments assimilating additional dropsonde observations of (1) temperature, (2) humidity, (3) temperature and humidity, and (4) temperature and humidity over a broad region. All of the experiments reduce errors relative to the control ...
author2 Cavallo, Steven
Parsons, David
Wang, Xuguang
author Bray, Matthew
author_facet Bray, Matthew
author_sort Bray, Matthew
title Investigating Arctic Cyclone-Tropopause Polar Vortex Interactions with Observing System Simulation Experiments
title_short Investigating Arctic Cyclone-Tropopause Polar Vortex Interactions with Observing System Simulation Experiments
title_full Investigating Arctic Cyclone-Tropopause Polar Vortex Interactions with Observing System Simulation Experiments
title_fullStr Investigating Arctic Cyclone-Tropopause Polar Vortex Interactions with Observing System Simulation Experiments
title_full_unstemmed Investigating Arctic Cyclone-Tropopause Polar Vortex Interactions with Observing System Simulation Experiments
title_sort investigating arctic cyclone-tropopause polar vortex interactions with observing system simulation experiments
publishDate 2023
url https://shareok.org/handle/11244/337606
geographic Arctic
Arctic Ocean
geographic_facet Arctic
Arctic Ocean
genre Arctic
Arctic Ocean
Sea ice
genre_facet Arctic
Arctic Ocean
Sea ice
op_relation OU Thesis and Dissertation Collections
https://shareok.org/handle/11244/337606
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