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DTSTAMP:20250918T163849Z
DESCRIPTION:Atmospheric and Oceanic Sciences Departmental Seminar Series\n
 \npresents\n\nPrecipitation and atmospheric rivers over Southern Ocean and
  Antarctica\n\na talk by\n\n Irina Gorodetskaya\n	Assistant Researcher\, Ce
 ntre for Environmental and Marine Studies\n	University of Aveiro\, Portugal
 \n\nAbstract\n\nIntensification of the global hydrological cycle has been 
 linked with increased precipitation in mid latitudes and polar regions. In
 creased precipitation over Antarctica affects the ice sheet mass balance a
 nd its contribution to global sea level rise. At the same time\, more prec
 ipitation over the Southern Ocean causes its freshening with important con
 sequences for ecosystems and ocean dynamics. During individual events\, th
 e partitioning of precipitation between the ocean and the ice sheet depend
 s strongly upon several atmospheric and air-sea interaction processes. The
 se include the underlying large- and meso-scale atmospheric dynamics\, eva
 poration rates from the surrounding ocean surface\, and the intensity of t
 he moisture flux during individual events\, particularly the phenomena kno
 wn as atmospheric rivers. Atmospheric models used for simulating weather a
 nd climate show significant differences in cloud and precipitation propert
 ies. The problem lies not only in the need to improve model parametrisatio
 ns but also in the lack of cloud and precipitation measurements in these r
 egions\, leading to large uncertainties in model estimates of variability 
 and trends in Southern Ocean and Antarctic precipitation. Since 2009 first
  precipitation radar was installed in the escarpment zone of East Antarcti
 ca at the Belgian Antarctic station Princess Elisabeth allowing long-term 
 measurements of precipitation reaching the ground and also virga.\n\nSever
 al other countries have followed with long-term measurements of precipitat
 ion using precipitation radar. Unique precipitation measurements using a m
 ulti-sensor approach were performed during the Swiss Polar Institute's Ant
 arctic Circumnavigation Expedition (December 2016-March 2017) along with r
 adiosonde profiling. During the last years intensive collaboration among d
 ifferent teams working in several countries\, including Belgium\, Switzerl
 and\, France\, Italy\, Portugal\, UK\, as well as other comprehensive meas
 urement campaigns (by US\, Australia\, New Zealand)\, have marked the unpr
 ecedented collaborative efforts in characterizing precipitation over Antar
 ctica and Southern Ocean. In this presentation I will discuss the most rec
 ent results concerning precipitation measurements and modeling\, and parti
 cularly intense precipitation events associated with atmospheric rivers\, 
 in Antarctica and Southern Ocean.\n\n \n\nMonday July 15/ 3: 30 PM/ Burnsi
 de Hall/ Room 934\n
DTSTART:20190715T193000Z
DTEND:20190715T210000Z
LOCATION:Room 934
SUMMARY:Precipitation and atmospheric rivers over Southern Ocean and Antarc
 tica 
URL:/meteo/channels/event/precipitation-and-atmospheri
 c-rivers-over-southern-ocean-and-antarctica-297911
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