סמינר מיוחד בגיאופיזיקה, במדעים אטמוספריים ובמדעי החלל על שם יובל נאמן
Adam Sobel, Columbia University - Sackler Lecturer
ההרצאות המיוחדות בגיאופיזיקה, במדעים אטמוספריים ובמדעי החלל על שם יובל נאמן
נתרמו ע"י ריימונד ובברלי סאקלר
EXTREME CYCLONIC EVENTS, FROM TORNADOES TO TROPICAL CYCLONES; ARE THERE ANY COMMONALITIES?
The last decade has seen an enormous increase in the volume of research on the relationship of tropical cyclones (TCs) to the large-scale climate. All the problems have not yet been solved by any means, but our understanding has matured considerably. Our understanding of the relationship of climate to severe convection over land (including tornadoes), on the other hand, remains in a much more primitive state – perhaps comparable to where the TC problem was a decade ago. Although the physics of tornadoes and TCs are almost entirely different, there are many commonalities in the research problems that arise when studying how each is related to the large-scale climate. Observational records are relatively short, sparse and troubled by changes in observing practices over time; standard climate models don’t resolve the storms well (not at all, in the case of tornadoes); we lack physical theories for key aspects of both problems; and the research communities with the most specialist knowledge of the storms tend to have closer ties to short-term operational forecasting than to climate research. In the face of these difficulties, some of the same approaches, broadly speaking, make sense in both problems. An example is what the TC community calls “genesis indices”, which to the tornado community is the “ingredients approach”. Beyond this example there may be other aspects where advances on one problem may usefully inform the other.
מארגנת הסמינר: ד"ר רוית חלד