A Case Study of Observed and Modeled Barrier Flow in the Denmark Strait in May 2015

A Case Study of Observed and Modeled Barrier Flow in the Denmark Strait in May 2015 AbstractMesoscale barrier jets in the Denmark Strait are common in winter months and have the capability to influence open ocean convection. This paper presents the first detailed observational study of a summertime (May 21, 2015) barrier wind event in the Denmark Strait using dropsondes and observations from an airborne Doppler Wind Lidar (DWL). The DWL profiles agree well with dropsonde observations and show a vertically narrow (~250-400 m) barrier jet of 23 to 28 m s-1 near the Greenland coast that broadens (~300-1000 m) and strengthens further off coast. In addition, we analyze otherwise identical regional high resolution Weather Research and Forecasting (WRF) model simulations of the event at four horizontal grid spacings (5, 10, 25, and 50 km), two vertical resolutions (40 and 60 levels), and two planetary boundary layer (PBL) parameterizations (MYNN2.5 and UW) to determine what model configurations best simulate the observed jet structure. Comparison of the WRF simulations with wind observations from satellites, dropsondes, and the airborne DWL scans indicate that the combination of both high horizontal resolution (5 km) and vertical resolution (60 levels) best captures observed barrier jet structure and speeds as well as the observed cloud field, including some convective clouds. Both WRF PBL schemes produced reasonable barrier jets with the UW scheme slightly out performing the MYNN2.5 scheme. However, further investigation at high horizontal and vertical resolution is needed to determine the impact of the WRF PBL scheme on surface energy budget terms, particularly in the high-latitude maritime environment around Greenland. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Monthly Weather Review American Meteorological Society

A Case Study of Observed and Modeled Barrier Flow in the Denmark Strait in May 2015

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0493
eISSN
1520-0493
D.O.I.
10.1175/MWR-D-16-0386.1
Publisher site
See Article on Publisher Site

Abstract

AbstractMesoscale barrier jets in the Denmark Strait are common in winter months and have the capability to influence open ocean convection. This paper presents the first detailed observational study of a summertime (May 21, 2015) barrier wind event in the Denmark Strait using dropsondes and observations from an airborne Doppler Wind Lidar (DWL). The DWL profiles agree well with dropsonde observations and show a vertically narrow (~250-400 m) barrier jet of 23 to 28 m s-1 near the Greenland coast that broadens (~300-1000 m) and strengthens further off coast. In addition, we analyze otherwise identical regional high resolution Weather Research and Forecasting (WRF) model simulations of the event at four horizontal grid spacings (5, 10, 25, and 50 km), two vertical resolutions (40 and 60 levels), and two planetary boundary layer (PBL) parameterizations (MYNN2.5 and UW) to determine what model configurations best simulate the observed jet structure. Comparison of the WRF simulations with wind observations from satellites, dropsondes, and the airborne DWL scans indicate that the combination of both high horizontal resolution (5 km) and vertical resolution (60 levels) best captures observed barrier jet structure and speeds as well as the observed cloud field, including some convective clouds. Both WRF PBL schemes produced reasonable barrier jets with the UW scheme slightly out performing the MYNN2.5 scheme. However, further investigation at high horizontal and vertical resolution is needed to determine the impact of the WRF PBL scheme on surface energy budget terms, particularly in the high-latitude maritime environment around Greenland.

Journal

Monthly Weather ReviewAmerican Meteorological Society

Published: Mar 30, 2017

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