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Mastrantonio, G.
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Mastrantonio, G.
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- PublicationOpen AccessCharacteristics of the boundary layerat Ny-Ålesund in the Arctic during the ARTIST field experiment(2003)
; ; ; ; ; ; ;Argentini, S.; Istituto di Scienze dell'Atmosfera e del Clima (ISAC), CNR, Roma, Italy ;Pietro Viola, A.; Istituto di Scienze dell'Atmosfera e del Clima (ISAC), CNR, Roma, Italy ;Mastrantonio, G.; Istituto di Scienze dell'Atmosfera e del Clima (ISAC), CNR, Roma, Italy ;Maurizi, A.; Istituto di Biometeorologia (IBIMET), CNR, Bologna, Italy ;Georgiadis, T.; Istituto di Biometeorologia (IBIMET), CNR, Bologna, Italy ;Nardino, M.; Istituto di Biometeorologia (IBIMET), CNR, Bologna, Italy; ; ; ; ; A preliminary analysis of boundary layer data acquired during the Arctic Radiation and Turbulence Interaction Study Experiment (ARTIST) at Ny-Ålesund (Spitzbergen) in 1998 is presented. As expected, the wind fi eld and the thermal structure of the boundary layer are strongly infl uenced by the katabatic fl ow blowing along the Kongsfjorden. In particular, if the large scale circulation has a component along the same direction, the resulting low level wind reaches velocities comparable with geostrophic wind. Stable to neutral conditions occurred most of the time, sustaining inversion or spiky layers respectively, depending on the wind intensity. The behaviour of some micrometeorological parameters was examined in relation to the general fl ow pattern and the characteristics of this area. The highest values of surface sensible heat fl ux (with negative sign) were observed during daytime, in presence of forced convection, due to the transfer of warmer upper layer air into the surface layer.201 659 - PublicationOpen AccessAnalysis of strong wind events around Adelie Land, East Antarctica(2003)
; ; ; ; ;Naithani, J.; Université Catholique de Louvain, Institut d Astronomie et de Géophysique Georges Lemaître, Louvain-la-Neuve, Belgium ;Argentini, S.; Istituto di Scienze dell' Atmosfera e del Clima (ISAC), CNR, Roma, Italy ;Schayes, G.; Université Catholique de Louvain, Institut d Astronomie et de Géophysique Georges Lemaître, Louvain-la-Neuve, Belgium ;Mastrantonio, G.; Istituto di Scienze dell' Atmosfera e del Clima (ISAC), CNR, Roma, Italy; ; ; Strong wind events at Dumont d'Urville (DdU), an East Antarctic coastal station, and Dome C, an interior station, were studied to determine if the wind along the Adelie Land coast increases with the approach of the depression from the west of the site or after its passage to the east of it. The events for the year 1993 were studied using synoptic observations, mean sea level pressure charts and composite infrared satellite images. It was found that the winds are enhanced with the approach of a depression from the west towards the DdU coast. The wind increases in response to the decreasing pressure at the coastal site and increasing downslope pressure difference (dp). The wind starts decreasing once the system moves to the east of DdU and the pressure at DdU starts building up, as reported in some earlier studies. The response of wind to the approaching depression is not the same for all the events but depends on the downslope pressure difference and the movement of the depression that is often conditioned by the presence of a blocking high to the northeast. The wind comes down if the system starts penetrating inland due to the presence of the high pressure ridge to the northeast and decreasing dp. It is observed that the winds at Dome C increase to as high as 17 m s-1 with the inland penetration of the depression.160 381