1,720,979 research outputs found
Climatic conditions and sporadic permafrost in the Maiella Massif (Cental Apennines, Italy)
No full textClimatic data were examined for some ten weather recording stations, in order to verify the presence of favorable conditions for preserving sporadic mountain permafrost in the Maiella Massif (Central Apennines, Italy). The analyzed data refer to the time-span 1965-1990; they have been gathered for recording stations located at altitudes ranging from sea level (Pescara) to over 2100 m a.s.l. (Campo Imperatore, Gran Sasso Massif). The mean annual average temperatures were ca. 6-7 °C in the higher areas; the seasonal means ranged from –4 °C in winter to 12 °C in summer. Average thermal gradients vary from 0.4 °C/100 m in January to 0.7 °C/100 m in July, with an annual average of 0.57 °C/100 m. Based upon these data, the altitude of the 0 °C isotherm in free air in the Maiella Massif is ca. 2500 m, whilst the –2 °C isotherm, which can be used as the lower climatic limit for the presence of permafrost, should be located slightly over 2750 m a.s.l., on average. The precipitation regime generally has sub-Mediterranean features, which are progressively more evident moving from the Adriatic to the Tyrrhenian side. It shows a maximum in late autumn or winter and a minimum in summer, locally associated with a secondary maximum in late spring. Annual precipitation ranges around 1200-1400 mm, both in the high plains and on the main mountain peaks. Snow falls are abundant, especially along the eastern sides of the mountain groups, because of direct exposition to Balcanic-Danubian cold currents. At 1000 m a.s.l., generally 150 to 200 cm of snow fall are recorded and a snow blanket is present for ca. 70 days, concentrated in the November-April period; at ca. 2000 m a.s.l. (Campo Imperatore), the snow fall sums up to 400 cm and 180-200 days of persistence are recorded from the end of October to the end of May. Analyzing the above situation, it is possible to infer that the general climatic framework allows the presence of permafrost only close to the top of the Maiella Massif, at altitudes exceeding 2750 m a.s.l. On the other hand, the bottom temperatures of winter snow cover (BTS) recorded in the Upper Cannella Valley, where sun irradiation is particularly reduced and wind blows very energetically during the cold period, demonstrate that permafrost can exist even at relatively low altitudes (ca. 2400 m a.s.l.) in particular morphologic conditions. This emphasizes the fact that micro-climatic conditions are instrumental in the energy balance of the ground, and therefore in the presence of permafrost
Analisi computerizzata della orientazione di tratti di reticolo idrografico e implicazioni neotettoniche: un esempio nell'area umbro-marchigiana.
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GEOMORPHOLOGY AND QUATERNARY EVOLUTION OF THE GLACIATED VALLEY LANDSISTEM OF CAMPO IMPERATORE, GRAN SASSO (CENTRAL ITALY)
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Interpolation of rainfall through polynomial regression in the marche region (Central Italy)
Full text linkNotwithstanding its small size (less than 10,000 km2), because of its varied topography, ranging from the Apennines Range (up to more than 2000 m amsl) to coastal environments, the Marche Region (the Adriatic side of Central Italy), is characterized by many different types of climate. In this region there are no fully satisfactory models to interpolate and generalize rainfall data from the 111 available meteorological recording stations; however, in this study an innovative way to interpret data linking precipitation to many topographic parameters is introduced. Based on those considerations, statistical analyses were carried out on rainfall historical series in order to assess significantly variations during the last 60 years and to create a model capable of explaining rainfall distribution based on geographical and topographic parameters. The model highlighted a significant decrease of rainfall from 1961–1990 to 1991–2016, over the whole period, in the hilly and mountainous sectors (100–200 mm), while closer to the coast the difference is slight (about 0–100 mm). The new model also highlights the presence of some outliers in the rainfall values, which may lead to a better comprehension of climatic dynamics in this area
Effetti economici e sociali del sisma sugli allevamenti dell’Alto Maceratese
Full text linkIl contributo analizza la filiera zootecnica dell’Alto Maceratese danneggiata dal sisma del
2016. Rispetto ad alcune difficolta storiche (marginalità territoriale e spopolamento), questa analisi si è concentrata sugli effetti del sisma. In collaborazione con i veterinari della
Regione Marche, è stato somministrato ad un campione di 55 famiglie di allevatori un
questionario semi-strutturato al fine di osservare le caratteristiche socio-economiche degli
allevamenti (prevalentemente a media quota e dediti nella metà dei casi unicamente all’attività zootecnica) e i danni prodotti dal sisma (ad abitazioni, patrimonio zootecnico e
strutture agricole). L’ultima sezione del questionario raccoglie alcune proposte di miglioramento nella fase di ricostruzione. Proprio la rigenerazione dei territori colpiti, infatti,
sembra porre ambizione sfide che riguardano il ripristino delle attività lavorative e il ritorno della popolazione sul territorio
The February 2012 exceptional snowfall along the Adriatic side of Central Italy
No full textBetween the end of January and mid February 2012, the Italian peninsula has been subject to the influence of many advections of arctic-continental air generating a series of cyclogenesis over the central-Mediterranean Sea. This caused widely spread mainly snowy precipitation, often persistent, mostly affecting the centralsouthern Regions, as well as Rome and Naples. Snowfalls and low temperatures caused some sixty casualties, besides huge damage to economic and productive facilities. The analysis of a large number of nivometric monitoring points, belonging to different institutions (Meteomont, Military Aviation, Civil Protection and Universities) allowed evaluating the spatial distribution of total snowfall. Comparing these figures with those referring to past perturbation phases similar in length - recorded in the winter of 1929, 1956, 1985 and 2005 - demonstrates that the 2012 event can be considered exceptional being characterized by a higher total thickness of snow cover almost everywhere along the hills and low mountains of the Adriatic side of Central Italy
TENDENZE TERMOMETRICHE TRENTENNALI
No full textL’analisi dei trend termometrici relativi alle stazioni è in fase di avanzato sviluppo, risulta tuttavia evidente che, come per l’intera costa adriatica (Bisci et al 2001) sembrerebbe evidente un segnale opposto a quello presente a scala regionale, con un lievissimo raffreddamento a quote collinari seguito da un altrettanto lieve riscaldamento, specie oltre i 1000 metri; dall’analisi dei dati standardizzati (fig. 7) è evidente una notevole alternanza di anni con temperature superiori ed inferiori alle medie ed una tendenza seppur infinitesima ad un decremento dei valori stessi.
E’ altresì evidente una notevole variabilità intrannuale nel decennio ‘71-’81, con una successiva tendenza al calo di tale variabilità. In generale gli anni più caldi sono risultati essere il 1982 ed il ‘90 (anche se dall’esame dei dati relativi all’ultimo decennio gli anni compresi tra il ’96 ed il ‘99 si sono rivelati ancora più caldi, specie in montagna), mentre anni particolarmente rigidi si sono avuti nel periodo 1976-1980
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