Article Type:
Research Article

The Norwegian IPY–THORPEX: Polar Lows and Arctic Fronts during the 2008 Andøya Campaign

J. E. Kristjánsson University of Oslo, Oslo, Norway

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I. Barstad Uni Bjerknes Centre, Bergen, Norway

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T. Aspelien Norwegian Meteorological Institute, Oslo, Norway

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I. Føre University of Oslo, Oslo, Norway

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Ø. Godøy Norwegian Meteorological Institute, Oslo, Norway

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Ø. Hov Norwegian Meteorological Institute, Oslo, Norway

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E. Irvine Norwegian Meteorological Institute, Oslo, Norway

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T. Iversen University of Reading, Reading, United Kingdom

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E. Kolstad Uni Bjerknes Centre, Bergen, Norway

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T. E. Nordeng Norwegian Meteorological Institute, Oslo, Norway

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H. McInnes University of Oslo, Oslo, Norway

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R. Randriamampianina Norwegian Meteorological Institute, Oslo, Norway

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J. Reuder Geophysical Institute, University of Bergen, Bergen, Norway

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Ø. Saetra Norwegian Meteorological Institute, Oslo, Norway

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M. Shapiro Geophysical Institute, University of Bergen, Bergen, Norway

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T. Spengler Geophysical Institute, University of Bergen, Bergen, Norway

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H. Ólafsson Geophysical Institute, University of Bergen, Bergen, Norway

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Online Publication:
01 Nov 2011
Print Publication:
01 Nov 2011
DOI:
https://doi.org/10.1175/2011BAMS2901.1
Page(s):
1443–1466
Full access

From a weather forecasting perspective, the Arctic poses particular challenges for mainly two reasons: 1) The observational data are sparse and 2) the weather phenomena responsible for severe weather, such as polar lows, Arctic fronts, and orographic influences on airflow, are poorly resolved and described by the operational numerical weather prediction (NWP) models. The Norwegian International Polar Year (IPY)– The Observing System Research and Predictability Experiment (THORPEX) project (2007–10) sought to significantly improve weather forecasts of these phenomena through a combined modeling and observational effort. The crux of the observational effort was a 3-week international field campaign out of northern Norway in early 2008, combining airborne and surface-based observations. The main platform of the field campaign was the Deutsches Zentrum für Luft- und Raumfahrt (DLR) research aircraft Falcon, equipped with lidar systems for profiling of aerosols, humidity, and wind, in addition to in situ measurements and dropsondes. A total of 12 missions were flown, yielding detailed observations of polar lows, Arctic fronts, and orographic low-level jets near Spitsbergen, the coast of northern Norway, and the east coast of Greenland. The lidar systems enabled exceptionally detailed measurements of orographic jets caused by the orography of Spitsbergen. Two major polar low developments over the Norwegian Sea were captured during the campaign. In the first polar low case, three f lights were carried out, providing a first-ever probing of the full life cycle of a polar low. Targeting observations by the aircraft in sensitive areas led to improvements in predicted track and intensity of the polar low. Here highlights from the field campaign, as well as from ongoing follow-up investigations, are presented. Highlights from the development of a new limitedarea model ensemble prediction system for the Arctic, as well as an exploitation of new satellite data [Infrared Atmospheric Sounding Interferometer (IASI) data], are also included.

From a weather forecasting perspective, the Arctic poses particular challenges for mainly two reasons: 1) The observational data are sparse and 2) the weather phenomena responsible for severe weather, such as polar lows, Arctic fronts, and orographic influences on airflow, are poorly resolved and described by the operational numerical weather prediction (NWP) models. The Norwegian International Polar Year (IPY)– The Observing System Research and Predictability Experiment (THORPEX) project (2007–10) sought to significantly improve weather forecasts of these phenomena through a combined modeling and observational effort. The crux of the observational effort was a 3-week international field campaign out of northern Norway in early 2008, combining airborne and surface-based observations. The main platform of the field campaign was the Deutsches Zentrum für Luft- und Raumfahrt (DLR) research aircraft Falcon, equipped with lidar systems for profiling of aerosols, humidity, and wind, in addition to in situ measurements and dropsondes. A total of 12 missions were flown, yielding detailed observations of polar lows, Arctic fronts, and orographic low-level jets near Spitsbergen, the coast of northern Norway, and the east coast of Greenland. The lidar systems enabled exceptionally detailed measurements of orographic jets caused by the orography of Spitsbergen. Two major polar low developments over the Norwegian Sea were captured during the campaign. In the first polar low case, three f lights were carried out, providing a first-ever probing of the full life cycle of a polar low. Targeting observations by the aircraft in sensitive areas led to improvements in predicted track and intensity of the polar low. Here highlights from the field campaign, as well as from ongoing follow-up investigations, are presented. Highlights from the development of a new limitedarea model ensemble prediction system for the Arctic, as well as an exploitation of new satellite data [Infrared Atmospheric Sounding Interferometer (IASI) data], are also included.

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