Key features of cold-air pool episodes in the North-East of the Iberian Peninsula (Cerdanya, Eastern Pyrenees)

Josep Ramon Miró, Juan Carlos Pena, Nick Pepin, Abdelmalik Sairouni, Montserrat Aran

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    Abstract

    Located in the North-East of the Iberian Peninsula, Cerdanya experiences intense Cold-Air Pool (CAP) episodes in which a decoupling between the valley atmosphere and the regional circulation develops, especially in winter. A network of 40 temperature sensors was deployed from 2012 to 2015 along seven elevational transects to collect hourly data of temperature and humidity, enabling the measurement of CAP characteristics and behaviour. Empirical Orthogonal Functions (EOFs) of minimum temperature anomalies were examined to study the spatial distribution of CAP. Days were classified as CAP or no-CAP using EOF analysis. The temporal variation of EOF analysis scores for the first component (PC1) indicates days prone to CAP. A synoptic analysis using Principal Component Analysis (factorization), cluster analysis (classification) and a Discriminant Analysis (reclassification) was performed successively. Results showed CAP days to be associated with high pressure and light winds, whilst no-CAP days were associated with surface northerly or north-easterly flow behind frontal passages.
    Original languageEnglish
    Pages (from-to)1105-1115
    JournalInternational Journal of Climatology
    Volume38
    Issue number3
    Early online date14 Aug 2017
    DOIs
    Publication statusPublished - 15 Mar 2018

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