Summary
Over the last 25 years the term “cold pool” has come to be used in many spheres as a synonym for floods. This has given rise to a major confusion that has even moved into international scientific and technical circles. In this paper we analyse how the concept of “cold air pool” has evolved from when it was defined at the beginning of the 20th century down to the present day, in which the Spanish term “DANA” (similar to a cut-off low) has been introduced in order to avoid existing confusions. In the course of the paper we take account of cold air pool genesis and their thermal and dynamic characteristics, and we discuss the factors that have led to them being identified (erroneously) with heavy rainfall events. The study takes as its basis a systematic analysis of all the cold air pools recorded in Europe, and particularly in the Iberian Peninsula, over the period 1974–1983, as well as in studies of the floods recorded in eastern Spain since 1950 until nowadays. The discussion done on the basis of this accurate analysis leads to the identification of a cold air pool as a type cut-off low (COL) and justifying the use of this more generic term when a structure like this is present in a heavy rainfall event. For a better illustration of the previous discussion and understanding of the role of COLs in intense rainfall events, we present the episode of September 1971 in Catalonia, in which over 400 mm were recorded. The analysis was carried out with the MM5 initialised with the ERA-40 re-analyses. The results show that the role of COLs in the heavy rainfall episodes recorded in Spain is mainly dynamic, both in terms of the circulation they create at low levels and the potential vorticity anomaly generated. This circulation draws in very warm, moist and potentially unstable air perpendicularly to the coast and the littoral mountain chains. The factor of thermal instability, owing to the presence of cold air at medium and higher levels, shows itself to be more important in zones where this warm moist advection at low levels is not as significant as in the Mediterranean zone.
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References
Arreola JL, Homar V, Romero R, Ramis C, Alonso S (2003) Multiscale numerical study of the 10–12 November 2001 strong cyclogenesis event in the western Mediterranean. Proc. 4th EGS Plinius Conf. on Mediterranean Storms, Alcudia (Spain), 2–4 October 2002, CD, sec. 1, num. 30
Benito G, Thorndycraft VR (2005) Palaeoflood hydrology and its role in applied hydrological sciences. In: Palaeofloods, hystorical data and climate variability: Applications in flood risk assessment (Benito G, Ouarda TBMJ, Bárdossy A, eds). J Hydrol 313(1–2): 3–15
Bessé J, Fournie A, Ranaudin M (1979) Météorologie, Tome 2, Aerologie-Méteorologie Dynamique. Ecole Nationale de l’Aviation Civile, France
AK Betts MJ Miller (1986) ArticleTitleA new convective adjustment scheme. Part II: Single column tests using GATE wave, BOMEX, ATEX and Arctic air-mass data sets Quart J Royal Met Soc 112 693–709
Dudhia J, Gill D, Manning K, Wang W, Bruyere C (2004) PSU/NCAR Mesoscale modeling system. Tutorial Class Notes and User’s Guide: MM5 Modeling System Version 3. Available online: http://www.mmm.ucar.edu/mm5/documents/tutorial-v3-notes.html (consulted 16/03/2006)
Fontaine P (1951) Les “gouttes d’air froid” sur l’Euroe, la Méditérranée et l’Atlantique est. La Météo April–June 1951: 98–112
P Fontaine C Portela (1959) ArticleTitleCauses météorologiques des grandes crues cévenales du début de l’automne 1958 La Météorologie I 53 ss
García F, Font R, Rivera A (1982) Situación atmosférica causante de las lluvias torrenciales durante los días 19 al 21 de Octubre de 1982 en el Levante Español. I.N.M., Madrid
García V, Carrasco A (1958) Lluvias de intensidad y extension extraordinarias causantes de las inundaciones de los días 13 y 14 de octubre de 1957 en las provincias de Valencia, Castellón y Alicante. Servicio Meteorológico Nacional, Serie A(30), 67 pp
Grell GA, Dudhia J, Stauffer DR (1994) A description of the fifth-generation Penn State/NCAR Mesoscale Model (MM5). NCAR Technical Note, NCAR/TN-398+STR, 117 pp
ME Hardman (1983) ArticleTitleCold pools Weather 38 152–153
BJ Hoskins ME McIntyre AW Robertson (1985) ArticleTitleOne the use and significance of isentropic potential vorticity maps Quart J Royal Met Soc 111 877–946 Occurrence Handle10.1256/smsqj.47001
Jansà A (1997) A general view about Mediterranean meteorology: Cyclones and hazardous weather. Proc. INM/WMO Int. Symp. on Cyclones and Hazardous Weather in the Mediterranean, Palma de Mallorca. Instituto Nacional de Meteorología and Universitat de les Illes Balears, pp 33–42
A Jansà A Genovés J Campins MA Picornell (1995) ArticleTitleMediterranean cyclones and Alpine heavy rain flood events MAP Newsletter 3 35–37
A Jansà A Genovés R Riosalido O Carretero (1996) ArticleTitleMesoscale cyclones vs heavy rain and MCS in the Western Mediterranean MAP Newsletter 5 24–25
Kain JS, Fritsch JM (1993) Convective parameterization for mesoscale models: The Kain-Fritsch scheme”. In: The representation of cumulus convection in numerical models (Emanuel KA, Raymond DJ, eds). Amer Meteor Soc, 246 pp
AS Kentarchos TD Davies (1998) ArticleTitleA climatology of cut-off lows at 200 hPa in the Northern Hemisphere, 1990–1994 Int J Climatol 18 379–390 Occurrence Handle10.1002/(SICI)1097-0088(19980330)18:4<379::AID-JOC257>3.0.CO;2-F
W Koppen (1886) ArticleTitleDie Bewegung der barometrischen Minima in den Tagen vom 20 bis 24 Januar 1886 über Europa Met Zeitschr 3 505
Llasat MC (1987) Episodios de lluvias copiosas en Cataluña: génesis, evolución y factores coadyuvantes. PhD Thesis. University of Barcelona, Barcelona, 543 pp
Llasat MC (1991) Gota fría. Barcelona: Ed. Marcombo, col. Boixareu Universitaria no. 6, 165 pp
MC Llasat M Puigcerver (1987) ArticleTitleGotas de aire frío Revista de Geofísica 42 245–246
MC Llasat M Puigcerver (1989) ArticleTitleGotas de aire frío en la Península Ibérica: Características Revista de Geofísica 45 177–188
MC Llasat M Puigcerver (1990) ArticleTitleCold air pools over Europe Meteorol Atmos Phys 42 171–177 Occurrence Handle10.1007/BF01314823
MC Llasat M Puigcerver (1994) ArticleTitleMeteorological factors associated with floods in the northeastern part of the Iberian Peninsula Nat Hazards 9 81–93 Occurrence Handle10.1007/BF00662592
MC Llasat R Rodriguez (1992) ArticleTitleExtreme rainfall events in Catalonia: the case of 12 November 1988 Nat Hazards 5 133–151 Occurrence Handle10.1007/BF00127002
MC Llasat T Rigo M Barriendos (2003) ArticleTitleThe “Montserrat-2000” flash-flood event: A comparison with the floods in the Northeastern Iberian Peninsula since the 14th century Int J Climatol 23 453–469 Occurrence Handle10.1002/joc.888
Llasat MC, Barriendos M, Barrera A, Rigo T (2005) Floods in Catalonia (NE Spain) since the 14th century. In: Palaeofloods, hystorical data and climate variability: Applications in flood risk assessment (Benito G, Ouarda TBMJ, Bárdossy A, eds). J Hydrol 313(1–2): 32–47
H Malberg (1985) Kaltlufttropfen Meteorologie und Klimatologie Springer Berlin 119–123
Mariani S, Casaioli M, Accadia C, Llasat MC, Pasi F, Davolio S, Elementi M, Ficca G, Romero R (2005) A limited area model intercomparison on the “Montserrat-2000” flash-flood event using statistical and deterministic methods. Natural Hazards and Earth System Science, Vol. 5, pp 565–581. Available on-line: http://www.copernicus.org/EGU/nhess/5/565.htm (consulted 16/03/2006)
Martín F (2003) Las gotas frías/DANAs. Ideas y conceptos básicos. Nota Técnica S.T.A.P. No. 38, Madrid: INM
Medina M (1976) Formación de gotas frías y burbujas cálidas. In: Meteorología Básica Sinóptica. Madrid: Ed. Paraninfo, pp 98–103
Milelli M, Llasat MC, Ducroq V (in press) The cases of June 2000, November 2000 and September 2002 as example of Mediterranean floods. Nat Hazards Earth Sys Sci
Miró-Granada Gelabert J (2003) Una implicacion juridica de una prediccion meteorologica sobre lluvias catastroficas (I). Revista del Aficionado a la Meteorología, 8. Available online: http://www.meteored.com/ram/numero8/implicacionjuridica.asp (consulted 16/03/2006)
Mounier J (1979) Les climates océaniques des regions Atlantiques de l’Espagne et du Portugal. PhD Thesis. University of Lille, 1205 pp
E Palmen (1949) ArticleTitleOn the origin and structure of high-level cyclones south of the maximum westerlies Tellus 1 22–31 Occurrence Handle10.1111/j.2153-3490.1949.tb01925.x
E Palmen CW Newton (1969) Atmospheric circulation systems Academic Press New York London 273–285
C Ramis MC Llasat A Genovés A Jansà (1994) ArticleTitleThe October-1987 floods in Catalonia: synoptic and mesoscale mechanisms Meteorol Appl 1 337–350 Occurrence Handle10.1002/met.5060010404
C Ramis S Alonso MC Llasat (1995) ArticleTitleA comparative study between two cases of extreme rainfall events in Catalonia Surv Geophys 16 141–161 Occurrence Handle10.1007/BF00665777
H Reuter (1968) Predicción del tiempo SeriesTitleMétodos y problemas INM Madrid 193
R Scherhag (1937) ArticleTitleEin Grenzfall atmosphärischer Steuerung: Die Bodenisobaren steuern ein Höhentief Ann Hydrogr Marit Met 65 27
R Scherhag (1939) ArticleTitleDer Kälteeinbruch Mitte Dezember 1938 Ann Hydrogr Marit Met 67 142
R Scherhag (1948) Neue Methoden der Wetteranalyse und Wetterprognose Springer Berlin 227–235
Zimmerschied W (1954) La topografía relativa como medio auxiliar indispensable para el análisis del mapa meteorológico, especialmente en su aplicación aeronaútica. SMN Serie A 24, Madrid
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Llasat, MC., Martín, F. & Barrera, A. From the concept of “Kaltlufttropfen” (cold air pool) to the cut-off low. The case of September 1971 in Spain as an example of their role in heavy rainfalls. Meteorol. Atmos. Phys. 96, 43–60 (2007). https://doi.org/10.1007/s00703-006-0220-9
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DOI: https://doi.org/10.1007/s00703-006-0220-9