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  Dynamics of dry intrusion air streams and their relevance for extreme weather

Raveh-Rubin, S., Fluck, E., Givon, Y., Ilotoviz, E., Klaider, N., Magaritz-Ronen, L., Nahum, S., Rai, D., Silverman, V., Yaari, T. (2023): Dynamics of dry intrusion air streams and their relevance for extreme weather, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1245

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017364 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017364_2
Genre: Conference Paper

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 Creators:
Raveh-Rubin, Shira1, Author
Fluck, Elody1, Author
Givon, Yonatan1, Author
Ilotoviz, Eyal1, Author
Klaider, Noy1, Author
Magaritz-Ronen, Leehi1, Author
Nahum, Stav1, Author
Rai, Deepika1, Author
Silverman, Vered1, Author
Yaari, Tsruya1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Dry intrusion (DI) air streams typically comprise the cold and dry sector of extratropical cyclones. These air parcels descend slantwise from the midlatitude upper troposphere towards the surface in lower latitudes, where the airstreams typically fan out behind the cyclone’s trailing cold front. In this talk I will review recent results based on a Lagrangian-based global climatology of DIs using ECMWF reanalysis data, allowing the quantification of the intrusions’ occurrence frequencies and association with extreme weather. Using representative case studies and longer-term climatologies we understand that DI air starts its descent from the upper troposphere behind midlatitude troughs of Rossby waves. When interacting with cyclones in the storm tracks, they are associated with strong cold fronts in the cyclone southwest quadrant (in the northern hemisphere) and with marked anomalies in the lower troposphere. Namely, dry and cold anomalies prevail, together with strong winds and destabilized lower troposphere. The modification of the lower troposphere by DIs entails strong associations with a diverse set of weather extremes, from heavy precipitation ahead of the dry air, strong winds and extreme cold temperatures, to wildfires in southeast Australia and Saharan dust storms. Finally, we note that surface extremes associated with DIs may extend beyond the midlatitudes, into subtropical and tropical regions.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-1245
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -