On the Co-Occurrence of Warm Conveyor Belt Outflows and PV Streamers*

Madonna, Erica; Limbach, Sebastian; Aebi, Christine; Joos, Hanna; Wernli, Heini; Martius, Olivia (2014). On the Co-Occurrence of Warm Conveyor Belt Outflows and PV Streamers*. Journal of the atmospheric sciences, 71(10), pp. 3668-3673. American Meteorological Society 10.1175/JAS-D-14-0119.1

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The co-occurrence of warm conveyor belts (WCBs), strongly ascending moist airstreams in extratropical cyclones, and stratospheric potential vorticity (PV) streamers, indicators for breaking Rossby waves on the tropopause, is investigated for a 21-yr period in the Northern Hemisphere using Interim European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-Interim) data. WCB outflows and PV streamers are respectively identified as two- and three-dimensional objects and tracked during their life cycle. PV streamers are more frequent than WCB outflows and nearly 15% of all PV streamers co-occur with WCBs during their life cycle, whereas about 60% of all WCB outflows co-occur with PV streamers. Co-occurrences are most frequent over the North Atlantic and North Pacific in spring and winter. WCB outflows are often located upstream of the PV streamers and form earlier, indicating the importance of diabatic processes for downstream Rossby wave breaking. Less frequently, PV streamers occur first, leading to the formation of new WCBs.

Item Type:	Journal Article (Original Article)
Division/Institute:	08 Faculty of Science > Institute of Geography 10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR) 08 Faculty of Science > Institute of Applied Physics 10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR) > MobiLab
Graduate School:	Graduate School of Climate Sciences
UniBE Contributor:	Aebi, Christine, Romppainen-Martius, Olivia
Subjects:	500 Science > 550 Earth sciences & geology 900 History > 910 Geography & travel 600 Technology > 620 Engineering
ISSN:	0022-4928
Publisher:	American Meteorological Society
Language:	English
Submitter:	Monika Wälti-Stampfli
Date Deposited:	06 Oct 2014 16:23
Last Modified:	05 Dec 2022 14:37
Publisher DOI:	10.1175/JAS-D-14-0119.1
URI:	https://boris.unibe.ch/id/eprint/58966