A study of the breeze circulation during summer and fall 2008 in Calabria, Italy

Federico, Stefano; Pasqualoni, L.; Leo, Leonardo De; Bellecci, C.

doi:10.1016/j.atmosres.2010.02.009

Cited by 26 publications

(14 citation statements)

References 18 publications

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“…4 in Federico et al, 2010), which marked the change in climate regime from summer to fall. The average temperature over Calabria decreased from 23.5 • C on 13 September to 15.7 • C on 18 September.…”

Section: Forecast and Analysis Examplesmentioning

confidence: 99%

Verification of surface minimum, mean, and maximum temperature forecasts in Calabria for summer 2008

Federico

2011

Nat. Hazards Earth Syst. Sci.

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Abstract. Since 2005, one-hour temperature forecasts for the Calabria region (southern Italy), modelled by the Regional Atmospheric Modeling System (RAMS), have been issued by CRATI/ISAC-CNR (Consortium for Research and Application of Innovative Technologies/Institute for Atmospheric and Climate Sciences of the National Research Council) and are available online at meteo.crati.it/previsioni.html (every six hours). Beginning in June 2008, the horizontal resolution was enhanced to 2.5 km. In the present paper, forecast skill and accuracy are evaluated out to four days for the 2008 summer season (from 6 June to 30 September, 112 runs). For this purpose, gridded high horizontal resolution forecasts of minimum, mean, and maximum temperatures are evaluated against gridded analyses at the same horizontal resolution (2.5 km).Gridded analysis is based on Optimal Interpolation (OI) and uses the RAMS first-day temperature forecast as the background field. Observations from 87 thermometers are used in the analysis system. The analysis error is introduced to quantify the effect of using the RAMS first-day forecast as the background field in the OI analyses and to define the forecast error unambiguously, while spatial interpolation (SI) analysis is considered to quantify the statistics' sensitivity to the verifying analysis and to show the quality of the OI analyses for different background fields.Two case studies, the first one with a low (less than the 10th percentile) root mean square error (RMSE) in the OI analysis, the second with the largest RMSE of the whole period in the OI analysis, are discussed to show the forecast performance under two different conditions. Cumulative statistics are used to quantify forecast errors out to four days. Results show that maximum temperature has the largest RMSE, while minimum and mean temperature errors are similar. ForCorrespondence to: S. Federico (s.federico@isac.cnr.it) the period considered, the OI analysis RMSEs for minimum, mean, and maximum temperatures vary from 1.8, 1.6, and 2.0 • C, respectively, for the first-day forecast, to 2.0, 1.9, and 2.6 • C, respectively, for the fourth-day forecast.Cumulative statistics are computed using both SI and OI analysis as reference. Although SI statistics likely overestimate the forecast error because they ignore the observational error, the study shows that the difference between OI and SI statistics is less than the analysis error.The forecast skill is compared with that of the persistence forecast. The Anomaly Correlation Coefficient (ACC) shows that the model forecast is useful for all days and parameters considered here, and it is able to capture day-to-day weather variability. The model forecast issued for the fourth day is still better than the first-day forecast of a 24-h persistence forecast, at least for mean and maximum temperature. The impact of using the RAMS first-day forecast as the background field in the OI analysis is quantified by comparing statistics computed with OI and SI analyses. Minimum temperature is more sensiti...

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Section: Forecast and Analysis Examplesmentioning

confidence: 99%

Verification of surface minimum, mean, and maximum temperature forecasts in Calabria for summer 2008

Federico

2011

Nat. Hazards Earth Syst. Sci.

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“…The elevated peaks to the south of Bosten Lake were the Kuluketage Mountains, which presented a rather unique condition for the development of breezes. It was observed that the onshore breeze, acting in phase with the slope winds, generated stronger and more persistent flow fields [17]. Numerical experiments also showed that inland elevated terrain tends to significantly strengthen the offshore breeze part of local diurnal circulations, as compared to the case without terrain [18].…”

Section: Study Area and The Meteorological Observational Datamentioning

confidence: 69%

An Analysis of the Physical Characteristics of the Summer Low Atmosphere in the Gobi Desert Adjacent to Bosten Lake, Xinjiang, China

Sun

Ning

et al. 2018

Advances in Meteorology

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A month-long field observation campaign was conducted, which covered approximately 100 km 2 of the Gobi Desert area on the southeast bank of Bosten Lake during the summer of 2016. The purpose of the study was to examine the physical characteristics of the low atmosphere over land-lake nonuniform underlying surfaces in the Gobi Desert of northwestern China. The results of the statistical analysis showed that, during the observational period, the average daytime surface horizontal thermal gradient reached up to −0.2 ∘ C/km from the lakeshore to southern Gobi Desert area. The near-surface wind field of the 7 km horizontal extent from the lakeshore was dominated by onshore breezes with average peak wind speeds above 5 m/s. In the atmospheric near-surface layer, an isohumidity layer at a height between 10 and 50 m a.g.l. was observed from 11:00 to 18:00 LST. Also, a case study for the atmospheric boundary layer and local circulation analyses was conducted. The onshore breezes were found to play a major role in the vertical structure of the local atmospheric boundary layer. The numerical simulation results indicated that there was an alternating day-night local circulation in the Bosten Lake area.

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“…A radar wind profiler operated at the experimental site in summer 2008 [14,15]. The instrument sounds the lower troposphere, usually up to 3 km, and measures the horizontal and vertical wind components using one vertical and two oblique beams slanted at an off-zenith angle of 15.5˚.…”

Section: Radar Wind Profilermentioning

confidence: 99%

Preliminary Meteorological Results of a Four-Dimensional Data Assimilation Technique in Southern Italy

Avolio¹,

Federico²,

Sempreviva³

et al. 2011

ACS

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A four-dimensional data assimilation (FDDA) scheme based on a Newtonian relaxation (or "nudging") was tested using observational asynoptic data collected at a coastal site in the Central Mediterranean peninsula of Calabria, southern Italy. The study is referred to an experimental campaign carried out in summer 2008. For this period a wind profiler, a sodar and two surface meteorological stations were considered. The collected measurements were used for the FDDA scheme, and the technique was incorporated into a tailored version of the Regional Atmospheric Modeling System (RAMS). All instruments are installed and operated routinely at the experimental field of the CRATI-ISAC/CNR located at 600 m from the Tyrrhenian coastline. Several simulations were performed, and the results show that the assimilation of wind and/or temperature data, both throughout the simulation time (continuous FDDA) and for a 12 h time window (forecasting configuration), produces improvements of the model performance. Considering a whole single day, improvements are substantial in the case of continuous FDDA while they are smaller in the case of forecasting configuration. Enhancements, during the first six hours of each run, are generally higher. The resulting meteorological fields are finalised as input into air quality and agro-meteorological models, for short-term predictions of renewable energy production forecast, and for atmospheric model initialization.

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A study of the breeze circulation during summer and fall 2008 in Calabria, Italy

Cited by 26 publications

References 18 publications

Verification of surface minimum, mean, and maximum temperature forecasts in Calabria for summer 2008

Verification of surface minimum, mean, and maximum temperature forecasts in Calabria for summer 2008

An Analysis of the Physical Characteristics of the Summer Low Atmosphere in the Gobi Desert Adjacent to Bosten Lake, Xinjiang, China

Preliminary Meteorological Results of a Four-Dimensional Data Assimilation Technique in Southern Italy

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