An extreme cold air outbreak over the Labrador Sea: Roll vortices and air-sea interaction
Observational data from two research aircraft flights are presented. The flights were planned to investigate the air–sea interaction during an extreme cold-air outbreak, associated with the passage of a synoptic-scale low pressure system over the Labrador Sea during 8 February 1997. This is the firs...
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:26900 2023-05-15T17:06:04+02:00 An extreme cold air outbreak over the Labrador Sea: Roll vortices and air-sea interaction Renfrew, Ian A. Moore, G. W. K. 1999 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/26900/ https://ueaeprints.uea.ac.uk/id/eprint/26900/1/renfrew_moore_rolls_MonWeaRev_1999.pdf https://doi.org/10.1175/1520-0493(1999)127<2379:AECAOO>2.0.CO;2 en eng https://ueaeprints.uea.ac.uk/id/eprint/26900/1/renfrew_moore_rolls_MonWeaRev_1999.pdf Renfrew, Ian A. and Moore, G. W. K. (1999) An extreme cold air outbreak over the Labrador Sea: Roll vortices and air-sea interaction. Monthly Weather Review, 127. pp. 2379-2394. doi:10.1175/1520-0493(1999)127<2379:AECAOO>2.0.CO;2 Article PeerReviewed 1999 ftuniveastangl https://doi.org/10.1175/1520-0493(1999)127<2379:AECAOO>2.0.CO;2 2023-03-23T23:31:37Z Observational data from two research aircraft flights are presented. The flights were planned to investigate the air–sea interaction during an extreme cold-air outbreak, associated with the passage of a synoptic-scale low pressure system over the Labrador Sea during 8 February 1997. This is the first such aircraft-based investigation in this remote region. Both high-level dropsonde and low-level flight-level data were collected. The objectives were twofold: to map out the structure of the roll vortices that cause the ubiquitous cloud streets seen in satellite imagery, and to estimate the sensible and latent heat fluxes between the ocean and atmosphere during the event. The latter was achieved by a Lagrangian analysis of the flight-level data. The flights were part of the Labrador Sea Deep Convection Experiment, investigating deep oceanic convection, and were planned to overpass a research vessel in the area. The aircraft-observed roll vortices had a characteristic wavelength of 4–5 km, particularly evident in the water vapor signal. Unlike observations of roll vortices in other regions, a roll signature was absent from the temperature data. Analysis of satellite imagery shows the cloud streets had a characteristic wavelength of 7–10 km, indicating a multiscale roll vortex regime. There was a dramatic deepening of the boundary layer with fetch, and also with time. Off the ice edge, surface sensible heat fluxes of 500 W m−2 and surface latent heat fluxes of 100 W m−2 were measured, with uncertainties of ±20%. The very cold air is thought to be responsible for the unusually high Bowen ratio observed. Article in Journal/Newspaper Labrador Sea University of East Anglia: UEA Digital Repository |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
English |
description |
Observational data from two research aircraft flights are presented. The flights were planned to investigate the air–sea interaction during an extreme cold-air outbreak, associated with the passage of a synoptic-scale low pressure system over the Labrador Sea during 8 February 1997. This is the first such aircraft-based investigation in this remote region. Both high-level dropsonde and low-level flight-level data were collected. The objectives were twofold: to map out the structure of the roll vortices that cause the ubiquitous cloud streets seen in satellite imagery, and to estimate the sensible and latent heat fluxes between the ocean and atmosphere during the event. The latter was achieved by a Lagrangian analysis of the flight-level data. The flights were part of the Labrador Sea Deep Convection Experiment, investigating deep oceanic convection, and were planned to overpass a research vessel in the area. The aircraft-observed roll vortices had a characteristic wavelength of 4–5 km, particularly evident in the water vapor signal. Unlike observations of roll vortices in other regions, a roll signature was absent from the temperature data. Analysis of satellite imagery shows the cloud streets had a characteristic wavelength of 7–10 km, indicating a multiscale roll vortex regime. There was a dramatic deepening of the boundary layer with fetch, and also with time. Off the ice edge, surface sensible heat fluxes of 500 W m−2 and surface latent heat fluxes of 100 W m−2 were measured, with uncertainties of ±20%. The very cold air is thought to be responsible for the unusually high Bowen ratio observed. |
format |
Article in Journal/Newspaper |
author |
Renfrew, Ian A. Moore, G. W. K. |
spellingShingle |
Renfrew, Ian A. Moore, G. W. K. An extreme cold air outbreak over the Labrador Sea: Roll vortices and air-sea interaction |
author_facet |
Renfrew, Ian A. Moore, G. W. K. |
author_sort |
Renfrew, Ian A. |
title |
An extreme cold air outbreak over the Labrador Sea: Roll vortices and air-sea interaction |
title_short |
An extreme cold air outbreak over the Labrador Sea: Roll vortices and air-sea interaction |
title_full |
An extreme cold air outbreak over the Labrador Sea: Roll vortices and air-sea interaction |
title_fullStr |
An extreme cold air outbreak over the Labrador Sea: Roll vortices and air-sea interaction |
title_full_unstemmed |
An extreme cold air outbreak over the Labrador Sea: Roll vortices and air-sea interaction |
title_sort |
extreme cold air outbreak over the labrador sea: roll vortices and air-sea interaction |
publishDate |
1999 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/26900/ https://ueaeprints.uea.ac.uk/id/eprint/26900/1/renfrew_moore_rolls_MonWeaRev_1999.pdf https://doi.org/10.1175/1520-0493(1999)127<2379:AECAOO>2.0.CO;2 |
genre |
Labrador Sea |
genre_facet |
Labrador Sea |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/26900/1/renfrew_moore_rolls_MonWeaRev_1999.pdf Renfrew, Ian A. and Moore, G. W. K. (1999) An extreme cold air outbreak over the Labrador Sea: Roll vortices and air-sea interaction. Monthly Weather Review, 127. pp. 2379-2394. doi:10.1175/1520-0493(1999)127<2379:AECAOO>2.0.CO;2 |
op_doi |
https://doi.org/10.1175/1520-0493(1999)127<2379:AECAOO>2.0.CO;2 |
_version_ |
1766061015981621248 |