BIBLIOS

Document type
Journal articles

Document subtype
Full paper

Title
Grape harvest dates as indicator of spring-summer mean maxima temperature variations in the Minho region (NW of Portugal) since the 19th century

Participants in the publication
J. Moreno (Author)
IDL
F. Fatela (Author)
Dep. Geologia
IDL
F. Moreno (Author)
E. Leorri (Author)
R. Taborda (Author)
Dep. Geologia
IDL
R. Trigo (Author)
Dep. Engenharia Geográfica, Geofísica e Energia
IDL

Summary
This paper reports a climatic reconstruction approach for the Minho region (NWof Portugal) using grape harvest dates (GHD) as proxy of surface air temperature. This newGHD serieswas built based on the records froma set of local and regional newspapers (1854–1978) and the annuals of a Wine Producers Cooperative (1978–2010). The strong inverse correlation between Minho GHD and the mean maxima temperatures of the preceding March to August months (GSTmax), registered at the Braga weather station for the overlap period 1941–2009, allowed a reconstruction, with associated statistical uncertainties, of the regional GSTmax back to 1856. These were then used to characterize the main climatic episodes in the region during the last 154 years. The most noticeable feature that emerges from the comparison of the Minho GSTmax with the global annual average temperatures of Jones et al. (2013) is that these regional temperatures, in clear contrast with the global warming observed from around 1990 onwards, show no noteworthy increasing trend. The influence of climatic variability was examined also in terms of the relations between GSTmax (1950–2009) and the main meteorological teleconnection patterns affecting the North Atlantic European sector where the Minho region is included. Data support the hypothesis that persistent positive modes of spring-summer Scandinavian (SCA) and summer East Atlantic/Western Russia patterns triggered lower GSTmax, especially in the 60s–80s. The search for solar imprints in the Minho region climate identified the SCA mode as a promising connection between the two, since it is significantly inversely\ncorrelated with both, the TSI and the GSTmax. Like in other traditional European viticultural regions, the Minho GHD have shown to be a valuable tool for understanding the interactions between large-scale circulation modes and regional/local climatic conditions. Besides it will deliver a reliable assessment of climatic proxies from geological record, like tidal marsh benthic foraminifera assemblages.


Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Where published
Global and Planetary Change

Publication Identifiers
ISSN - 0921-8181

Publisher
Elsevier BV



Document Identifiers
DOI - https://doi.org/10.1016/j.gloplacha.2016.04.003
URL - http://dx.doi.org/10.1016/j.gloplacha.2016.04.003

Rankings
Web Of Science Q1 (2017) - 3.982 - GEOSCIENCES, MULTIDISCIPLINARY - SCIE
SCOPUS Q1 (2016) - 1.748 - Global and Planetary Change
SCOPUS Q1 (2016) - 1.748 - Global and Planetary Change