http://www.cnr.it/ontology/cnr/individuo/prodotto/ID276857
The impact of winter 2012 cold outbreak over the Northern Adriatic Sea dynamics: preliminary comparison among data and high resolution operational atmospheric models (Abstract/Comunicazione in rivista)
- Type
- Label
- The impact of winter 2012 cold outbreak over the Northern Adriatic Sea dynamics: preliminary comparison among data and high resolution operational atmospheric models (Abstract/Comunicazione in rivista) (literal)
- Anno
- 2013-01-01T00:00:00+01:00 (literal)
- Alternative label
Silvio Davolio, Mario M. Miglietta, Sandro Carniel, Alvise Benetazzo, Andrea Buzzi, Oxana
Drofa, Pierpaolo Falco, Maurizio Fantini, Piero Malguzzi, Antonio Ricchi, Aniello Russo,
Tiziana Paccagnella, Mauro Sclavo (2013)
The impact of winter 2012 cold outbreak over the Northern Adriatic Sea dynamics: preliminary comparison among data and high resolution operational atmospheric models
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Silvio Davolio, Mario M. Miglietta, Sandro Carniel, Alvise Benetazzo, Andrea Buzzi, Oxana
Drofa, Pierpaolo Falco, Maurizio Fantini, Piero Malguzzi, Antonio Ricchi, Aniello Russo,
Tiziana Paccagnella, Mauro Sclavo (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- CNR-ISAC, Institute of Atmspheric Sciences and Climate, Bologna, Italy,
CNR-ISMAR, Institute of Marine Sciences,Venice, Italy,
DiSAm, University \"Parthenope\", Naples, Italy,
Dept. of Life and Environmental Sciences, Università Politecnica delle Marche, Ancona, Italy,
SIMC, ARPA-EMR, Bologna, Italy (literal)
- Titolo
- The impact of winter 2012 cold outbreak over the Northern Adriatic Sea dynamics: preliminary comparison among data and high resolution operational atmospheric models (literal)
- Abstract
- Shelf dense water formation (DWF) events may be taking place during winter time on the broad, shallow shelf
in the northern region of the Adriatic basin exposed to the Bora winds, bringing cold, dry air from the north-east
down the Dinaric Alps. Indeed, the resulting intense evaporation and cooling of the shelf waters may produce
North Adriatic Dense Water (NAdDW), which then tends to sink and \"cascade\" all the way to the southern basin.
During these rather episodic formation processes, more frequent during winter time, the main controlling factors
are intense cold wind out- breaks, the ambient water density, preconditioned during late autumn, and also other
factors, e.g. river discharges.
When such processes of buoyancy extraction happen, several isopycnic surfaces outcrop and very often the whole
water column (20-25 m deep) may be ventilated. However, the general process of northern water masses flow-
ing to the southern part of the Adriatic basin is complex and far from being completely understood. In order to
understand and model these processes, it is mandatory to utilize high resolution meteorological forcing fields and
circulation models, at least to model particular events in Adriatic marine circulation, if not its longer term (e.g.,
seasonal) characteristics. The use of low resolution winds in fact necessarily implies a calibration factor to better
match surface fluxes and to reproduce wind-driven circulation. This is particularly evident in the case of the cross-
basin Bora pattern, because the complexity and small scale of Adriatic orography is often poorly reproduced in
atmospheric models, while Bora flow is composed of an alternation of high and low wind speed 'strips' crossing
the Adriatic in correspondence of the fine scale (10-100 km) Balkanic orographic gaps.
Within the framework of activities of the Italian flagship Project \"RITMARE\" and of the FIRB \"DECALOGO\",
we focused on the current meteorological modeling capabilities to describe an event of exceptionally dense water
formation, registered during the 2012 winter in the northern Adriatic region. During late January and early Febru-
ary, indeed, the basin was characterized by a persistent and exceptional cold anomaly responsible for large energy
losses due to cold and extremely strong winds. Sea waters temperatures dropped to about 6o C and the Venice
lagoon got partially covered by ice.
In the period of interest, available measurements in the northern Adriatic Sea (temperature, salinity, density, wind
speed, direction and inferred heat fluxes) were used, together with satellite measurements, to carry out a first semi-
quantitative comparison among existing meteorological models implemented over the region. Namely, the work
presents an intercomparison among three state-of-the-art, non-hydrostatic NWP models: COSMO-I7, WRF and
MOLOCH. All models are run in operational mode, and their results are used by several Regional authorities and
institutions for weather forecasting and support to civil protection decision. Therefore, this evaluation is a useful
assessment preliminary to a full coupling of the above mentioned atmospheric models with existing ocean models
already implemented in the region (e.g. ROMS in the COAWST system).
Preliminary results show also some uncommon mesoscale structures reproduced by the models in the proximity
of the central-south Italian coast, and highlight their possible influence on the local surface sea circulation. These
effects will be soon explored by means of fully-coupled ocean-atmosphere models within on-going projects. (literal)
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