Universität zu Köln

Lionello, Piero, Trigo, Isabel F., Gil, Victoria, Liberato, Margarida L. R. ORCID: 0000-0002-6677-9366, Nissen, Katrin M., Pinto, Joaquim G., Raible, Christoph C., Reale, Marco, Tanzarella, Annalisa, Trigo, Ricardo M., Ulbrich, Sven and Ulbrich, Uwe (2016). Objective climatology of cyclones in the Mediterranean region: a consensus view among methods with different system identification and tracking criteria. Tellus Ser. A-Dyn. Meteorol. Oceanol., 68. ABINGDON: TAYLOR & FRANCIS LTD. ISSN 1600-0870

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Abstract

The Mediterranean storm track constitutes a well-defined branch of the North Hemisphere storm track and is characterised by small but intense features and frequent cyclogenesis. The goal of this study is to assess the level of consensus among cyclone detection and tracking methods (CDTMs), to identify robust features and to explore sources of disagreement. A set of 14 CDTMs has been applied for computing the climatology of cyclones crossing the Mediterranean region using the ERA-Interim dataset for the period 1979-2008 as common testbed. Results show large differences in actual cyclone numbers identified by different methods, but a good level of consensus on the interpretation of results regarding location, annual cycle and trends of cyclone tracks. Cyclogenesis areas such as the north-western Mediterranean, North Africa, north shore of the Levantine basin, as well as the seasonality of their maxima are robust features on which methods show a substantial agreement. Differences among methods are greatly reduced if cyclone numbers are transformed to a dimensionless index, which, in spite of disagreement on mean values and interannual variances of cyclone numbers, reveals a consensus on variability, sign and significance of trends. Further, excluding 'weak' and 'slow' cyclones from the computation of cyclone statistics improves the agreement among CDTMs. Results show significant negative trends of cyclone frequency in spring and positive trends in summer, whose contrasting effects compensate each other at annual scale, so that there is no significant long-term trend in total cyclone numbers in the Mediterranean basin in the 1979-2008 period.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lionello, Piero UNSPECIFIED UNSPECIFIED UNSPECIFIED Trigo, Isabel F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gil, Victoria UNSPECIFIED UNSPECIFIED UNSPECIFIED Liberato, Margarida L. R. UNSPECIFIED orcid.org/0000-0002-6677-9366 UNSPECIFIED Nissen, Katrin M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pinto, Joaquim G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Raible, Christoph C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Reale, Marco UNSPECIFIED UNSPECIFIED UNSPECIFIED Tanzarella, Annalisa UNSPECIFIED UNSPECIFIED UNSPECIFIED Trigo, Ricardo M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ulbrich, Sven UNSPECIFIED UNSPECIFIED UNSPECIFIED Ulbrich, Uwe UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-293488
DOI:	10.3402/tellusa.v68.29391
Journal or Publication Title:	Tellus Ser. A-Dyn. Meteorol. Oceanol.
Volume:	68
Date:	2016
Publisher:	TAYLOR & FRANCIS LTD
Place of Publication:	ABINGDON
ISSN:	1600-0870
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EXTRATROPICAL CYCLONES; SURFACE CYCLONES; PRECIPITATION; REANALYSIS; ERA-40; STORM; VARIABILITY; SENSITIVITY; MECHANISMS; ALGORITHM Multiple languages Meteorology & Atmospheric Sciences; Oceanography Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/29348