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

Graduate School:

Graduate School of Climate Sciences

UniBE Contributor:

Aebi, Christine and 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:

20 Apr 2015 16:55

Publisher DOI:

10.1175/JAS-D-14-0119.1

URI:

https://boris.unibe.ch/id/eprint/58966

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