BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Deep vertical propagation of mountain waves above Scandinavia and 
 New Zealand - Andreas Dörnbrack\,Institut für Physik der Atmosphäre
DTSTART:20150127T140000Z
DTEND:20150127T150000Z
UID:TALK56898@talks.cam.ac.uk
CONTACT:Dr. Pranab Deb
DESCRIPTION:The project "Investigation of the life cycle of gravity waves"
 \n(GW-LCYCLE) is part of the German research initiative ROMIC (Role of the
 \nMiddle atmosphere In Climate) funded by the ministry of research.\nAs mi
 lestones of the project\, two research campaigns were conducted in \nnorth
 ern Scandinavia (December 2013) and in New Zealand (June-November 2014).\n
  \nIn close cooperation with Scandinavian partners as the Stockholm\nUnive
 rsity and the Finnish Meteorological Institute the field program in\nScand
 inavia combined ground-based observations of tropospheric and lower\nstrat
 ospheric flow and stratospheric and mesospheric temperature by\nlidars and
  radars at Alomar (Norway) and at Esrange (Sweden) with\nairborne and ball
 oon-borne observations. Northern Scandinavia was chosen\nsince the westerl
 y flow across the mountains is often aligned with the\npolar night jet per
 mitting gravity waves to propagate into the\nmiddle atmosphere.\n\nDuring 
 GW-LCYCLE\, the atmospheric flow above the Scandinavian mountains\nwas obs
 erved under distinct meteorological conditions enabling or\nattenuating th
 e deep vertical propagation of mountain-induced gravity\nwaves. The presen
 tation juxtaposes two different cases and analyses the\nassociated meteoro
 logical conditions. The unique combination of airborne\ntropospheric wind 
 lidar measurements\, flight level data\, high-frequency\nradiosonde profil
 es and the ground-based lidar observations allow a\ncomprehensive study of
  deeply propagating gravity waves from the Earth’s\nsurface to the mesos
 phere.\n\nOur institute also participated in the field phase of DEEPWAVE-N
 Z (DEEP\npropagating gravity WAVE experiment over New Zealand) which was\n
 conducted in June and July 2014. Key instruments were the NSF/NCAR GV\nand
  the DLR Falcon research aircraft\, a suite of ground-based\ninstruments\,
  and satellite sensors. \n\nDuring DEEPWAVE-NZ operational forecasts of th
 e ECMWF's integrated\nforecast system were used to provide guidance for pl
 anning the research\nflights of NSF/NCAR GV and the DLR Falcon during inte
 nse observing\nperiods. For certain cases\, an astonishing agreement was n
 oticed between\nthe forecasted wave events in the upper atmosphere and obs
 ervations.\nHere\, operational ECMWF analyses and forecasts are used to ch
 aracterize\nthe atmospheric state from the Earth's surface to the mesosphe
 re during\nthe DEEPWAVE field campaign. For selected cases\, airborne and\
 nground-based observations are compared with the ECMWF data.\n
LOCATION:British Antarctic Survey\, Room 307
END:VEVENT
END:VCALENDAR