Synoptic control over winter snowfall variability observed in a remote site of Apennine Mountains (Italy), 1884–2015
نویسندگان
چکیده
Abstract. This work presents a new, very long snowfall time series collected in remote site of Italian Apennine mountains (Montevergine Observatory, 1280 m above sea level). After careful check, based on quality control tests and homogenization procedures, the available data (i.e. daily height new snow) have been aggregated over winter season (December–February) to study long-term variability for period 1884–2020. The main evidence emerging from this analysis lies (i) strong interannual amounts, (ii) absence relevant trend late 19th century mid-1970s, (iii) reduction amount frequency occurrence mid-1970s end 1990s (iv) increase average past 20 years. Moreover, shed light relationship between observed Montevergine large-scale atmospheric circulation. Six different synoptic types, describing meteorological scenarios triggering snow events area, identified by means cluster analysis, using two essential variables, 500 hPa geopotential level pressure (both retrieved third version Twentieth Century Reanalysis dataset, which is 1884–2015 period). Such patterns trace out characterized presence blocking high-pressure anomaly Scandinavia or North Atlantic cold air outbreak involving both maritime continental masses. A further demonstrates that types are strongly related with teleconnection patterns, i.e. Arctic Oscillation (AO), Eastern Western Russia (EAWR), Mediterranean Pattern (EMP), (NAO) Scandinavian pattern (SCAND), govern European variability. decline amounts 1970s can be mainly ascribed positive AO NAO indices, determined, turn, decrease incidence associated advection, central moist arctic recent explained reverse index prevalence neutral negative EAWR pattern.
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ژورنال
عنوان ژورنال: The Cryosphere
سال: 2022
ISSN: ['1994-0424', '1994-0416']
DOI: https://doi.org/10.5194/tc-16-1741-2022