Meteorological aspects of an abnormal cooling event over Iran in April 2009

Dyuthi/Manakin Repository

Meteorological aspects of an abnormal cooling event over Iran in April 2009

Show simple item record Dr.Babu, C A Soltani, M. Mofidi, A 2014-05-17T07:40:24Z 2014-05-17T07:40:24Z 2014-01-14
dc.identifier.issn 0177-7971
dc.description Meteorol Atmos Phys DOI 10.1007/s00703-014-0309-5 en_US
dc.description.abstract During the period from 12 to 15 April, 2009 nearly the entire Iran, apart from the southern border, experienced an advective cooling event. While winter freezing concerns are typical, the nature of this freezing event was unusual with respect to its date of occurrence and accompanying synoptic meteorological situation. To analyze the freezing event, the relevant meteorological data at multiple levels of the atmosphere were examined from the NCEP/ NCAR reanalysis dataset. The results showed that a polar vortex was responsible for the freezing event over the country extending southward extraordinarily in such a way that its ridge influenced most parts of Iran. This was recognized as an abnormal extension of a polar vortex in the recent years. The sea-level pressure fields indicated that a ridge of large-scale anticyclone centered over Black Sea extended southward and prevailed over most parts of Iran. This resulted in the formation of a severe cold air advection from high latitudes (Polar region) over Iran. During the study period, moisture pumping was observed from the Arabian Sea and Persian Gulf. The winds at 1000 hPa level blew with a magnitude of 10 m s-1 toward south in the region of convergence (between -2 9 10-6 s-1 and -12 9 10-6 s-1). The vertical profilesof temperature and humidity also indicated that the ICE structural icing occurred at multiple levels of the atmosphere, i.e, from 800 hPa through 400 hPa levels. In addition to the carburetor (or induction), icing occurred between 900 and 700 hPa levels in the selected radiosonde stations during the study period. In addition, the HYSPLIT backward trajectory model outputs were in quite good agreement with the observed synoptic features en_US
dc.description.sponsorship CUSAT AND CSIR en_US
dc.language.iso en en_US
dc.publisher Springer-Verlag Wien 2014 en_US
dc.subject abnormal cooling event en_US
dc.subject Iran en_US
dc.subject Meteorological aspects en_US
dc.subject Frost en_US
dc.title Meteorological aspects of an abnormal cooling event over Iran in April 2009 en_US
dc.type Article en_US

Files in this item

Files Size Format View Description
Soltani.CAB.Mofidi_MAP.pdf 3.238Mb PDF View/Open PDF

This item appears in the following Collection(s)

Show simple item record

Search Dyuthi

Advanced Search


My Account