On the vertical structure of Mediterranean explosive cyclones

Kouroutzoglou, John; Flocas, Helena A.; Keay, Kevin; Simmonds, Ian; Hatzaki, Maria

doi:10.1007/s00704-012-0620-3

Cited by 29 publications

(29 citation statements)

References 50 publications

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“…Therefore, 72 cases of explosive cyclones in the Mediterranean were detected for the cold period of 2002-2010, implying an average number of eight cases per year, which is higher than the respective one for the cold period of 1962(Kouroutzoglou et al 2012a. Although a direct comparison of the effect of the ERA-Interim dataset compared to the ERA-40 one is not easy in our case since the above-mentioned periods are different; Dee et al (2011) stated that the incorporation of improvements in data assimilation in the ERA-Interim reanalysis results in the detection of more intense cyclones as compared to the ERA-40 dataset.…”

Section: Methodsmentioning

confidence: 85%

“…For the selected case study, the vertical tracing was performed for every step of the cyclone's lifecycle. A detailed description of the vertical tracing scheme (VTS) of the MS scheme and the methodology followed for explosive cyclones in the Mediterranean can be found in Kouroutzoglou et al (2012a). Nevertheless, some basic principles can be described in this study.…”

Section: Methodsmentioning

confidence: 98%

“…The search for the connection between a cyclone at the lower level and a cyclone at the upper level is performed inside a circular domain centered at the lower level cyclone center. If more than one candidate is found within the searching domain of an isobaric level, a weighting is given to the factors controlling the separation, the depth difference and the type difference (closed-open) between the lower and the upper-level cyclone (Kouroutzoglou et al 2012a).…”

Section: Methodsmentioning

confidence: 99%

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On the dynamics of a case study of explosive cyclogenesis in the Mediterranean

Kouroutzoglou

Flocas

Hatzaki

et al. 2014

Meteorol Atmos Phys

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In this study, a case of explosive cyclogenesis over the central Mediterranean is examined with the aid of the MS Cyclone Detection and Tracking Scheme along with the Vertical Tracing Software and the Parcel Trajectory Software that were developed in Melbourne University, employing a regular 0.5°9 0.5°latitude-longitude grid of the ERA-Interim dataset. It is found that the explosive cyclogenesis occurred as a result of the downward intrusion of high-PV cold stratospheric air into the upper troposphere combined with a low-level warm environment surrounded by the bent-back structure of the cold front in the poleward side of a jet streak. The positive effect of the diabatic processes in explosive cyclogenesis is demonstrated. When cold air masses cross the warmer sea of the central Mediterranean, positive surface sensible and latent heat fluxes generate a low-level warm and moist environment, favorable for convective activity.

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Section: Methodsmentioning

confidence: 85%

Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

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On the dynamics of a case study of explosive cyclogenesis in the Mediterranean

Kouroutzoglou

Flocas

Hatzaki

et al. 2014

Meteorol Atmos Phys

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“…Others would be to improve reanalysis datasets to the point where they are better able to represent fine-scale structures of extratropical cyclones, or the extension of cyclone identification schemes to examine vertical structures of cyclones (e.g., Dacre et al 2012;Kouroutzoglou et al 2012;Čampa and Wernli 2012). One would be generating a "best-track dataset" for extreme extratropical cyclones, as already exists for tropical cyclones.…”

Section: Discussion a N D Co N C Lu S I O N Smentioning

confidence: 99%

IMILAST: A Community Effort to Intercompare Extratropical Cyclone Detection and Tracking Algorithms

Neu

Akperov

Bellenbaum

et al. 2013

Bulletin of the American Meteorological Society

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501

578

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“…cyclone analysis only with the M10 method (the Arctic tropopause is close to the 300 hPa level). Keable et al (2002), Lim and Simmonds (2007), Kouroutzoglou et al (2012) and Flocas et al (2013) have shown that M10 can be applied successfully to upper-troposphere cyclone identification, whereas such comprehensive upper-level assessments have not been undertaken with the other algorithms. This analysis was undertaken for the same period and reanalysis as the surface cyclone identification, and the tests for vertical associations was undertaken with the technique described by Lim and Simmonds (2007).…”

Section: Association Of Tropopause Polar Vortices With Extreme Arcticmentioning

confidence: 99%

A comparison of tracking methods for extreme cyclones in the Arctic basin

Simmonds

Rudeva

2014

Tellus A: Dynamic Meteorology and Oceanography

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A B S T R A C T Dramatic climate changes have occurred in recent decades over the Arctic region, and very noticeably in nearsurface warming and reductions in sea ice extent. In a climatological sense, Arctic cyclone behaviour is linked to the distributions of lower troposphere temperature and sea ice, and hence the monitoring of storms can be seen as an important component of the analysis of Arctic climate. The analysis of cyclone behaviour, however, is not without ambiguity, and different cyclone identification algorithms can lead to divergent conclusions. Here we analyse a subset of Arctic cyclones with 10 state-of-the-art cyclone identification schemes applied to the ERA-Interim reanalysis. The subset is comprised of the five most intense (defined in terms of central pressure) Arctic cyclones for each of the 12 calendar months over the 30-yr period from 1 January 1979 to 31 March 2009. There is a considerable difference between the central pressures diagnosed by the algorithms of typically 5Á10 hPa. By contrast, there is substantial agreement as to the location of the centre of these extreme storms. The cyclone tracking algorithms also display some differences in the evolution and life cycle of these storms, while overall finding them to be quite long-lived. For all but six of the 60 storms an intense tropopause polar vortex is identified within 555 km of the surface system. The results presented here highlight some significant differences between the outputs of the algorithms, and hence point to the value using multiple identification schemes in the study of cyclone behaviour. Overall, however, the algorithms reached a very robust consensus on most aspects of the behaviour of these very extreme cyclones in the Arctic basin.

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On the vertical structure of Mediterranean explosive cyclones

Cited by 29 publications

References 50 publications

On the dynamics of a case study of explosive cyclogenesis in the Mediterranean

On the dynamics of a case study of explosive cyclogenesis in the Mediterranean

IMILAST: A Community Effort to Intercompare Extratropical Cyclone Detection and Tracking Algorithms

A comparison of tracking methods for extreme cyclones in the Arctic basin

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