HR: 10:35h
AN: A12C-02    [Abstracts]
TI: Extratropical Summer Storms in the North Atlantic: Variability and Relation to the Large Scale Flow
AU: * Mesquita, M d
EM: mme085@student.uib.no
AF: University of Bergen, Allegaten 70, Bergen, 5007 Norway
AU: Kvamstø, N
EM: nils.kvamsto@gfi.uib.no
AF: University of Bergen, Allegaten 70, Bergen, 5007 Norway
AU: Kvamstø, N
EM: nils.kvamsto@gfi.uib.no
AF: Bjerknes Centre for Climate Research, Allegaten 55, Bergen, 5007 Norway
AU: Sorteberg, A
EM: asgeir.sorteberg@bjerknes.uib.no
AF: Bjerknes Centre for Climate Research, Allegaten 55, Bergen, 5007 Norway
AB: Numerous studies on storm track climatology, variability and relation to the large scale flow have been investigated with respect to the winter season. However, hardly any such investigations have been done related to the summer season. In this research, some climatologic properties of summer extratropical storm tracks are presented based upon ensemble statistics of many individual storm tracks calculated by means of a feature tracking algorithm. NCEP/NCAR reanalysis data during 1948 - 2002 provided by the NOAA-CIRES Climate Diagnostics Center has been used as input to the tracking method. The 850hPa relative vorticity is used instead of the more often used Mean Sea Level Pressure (MSLP) because it is not an extrapolated field to any large extent, and is less influenced by the background flow than fields such as MSLP and geopotential height. Furthermore, it focuses on smaller scale synoptic activity than these other fields with the advantage that a higher number of storm trajectories can be identified. In the poster, the summer storm track variability will be presented. Both the JJA storm climatology and variability have also been compared with corresponding winter diagnostics. In a second part, we investigate the North Atlantic storm-track variability's relation to the large scale flow.
UR: http://www.student.uib.no/~mme085/
DE: 1620 Climate dynamics (0429, 3309)
DE: 3305 Climate change and variability (1616, 1635, 3309, 4215, 4513)
DE: 3309 Climatology (1616, 1620, 3305, 4215, 8408)
DE: 3364 Synoptic-scale meteorology
DE: 3399 General or miscellaneous
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005