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wdc-climate.de:2250976 eng; USA collection UNI_HH_MI_ARKTIS1991 Christian Wetzel University of Hamburg http://www.mi.uni-hamburg.de/ pointOfContact Dr. Gerd Müller University of Hamburg http://www.mi.uni-hamburg.de/ pointOfContact 2011-06-22T14:51:00 ISO 19115 ISO 19115-2:2009 ARKTIS 1991 - Cellular Convection over the Norwegian Sea: radiosoundings at the research vessel Valdivia and station Bear Island 2012-03-28 publication 1 UNI_HH_MI_ARKTIS1991 doi:10.1594/WDCC/UNI_HH_MI_ARKTIS1991 Dr. Gerd Müller University of Hamburg http://www.mi.uni-hamburg.de/ Email: gerd.mueller@zmaw.de originator Gottfried Kruspe Max Planck Institute for Meteorology http://www.mpimet.mpg.de/ author Prof. Dr. Burghard Brümmer University of Hamburg http://www.mi.uni-hamburg.de/ Email: burghard.bruemmer@zmaw.de author Dr. Gerd Müller University of Hamburg http://www.mi.uni-hamburg.de/ Email: gerd.mueller@zmaw.de author Christian Wetzel University of Hamburg http://www.mi.uni-hamburg.de/ Email: christian.wetzel@zmaw.de author Prof. Dr. Burghard Brümmer University of Hamburg http://www.mi.uni-hamburg.de/ Email: burghard.bruemmer@zmaw.de principalInvestigator WDC Climate at DKRZ publisher The field experiment ARKTIS 1991 was an expedition planned by meteorologists of the Collaborative Research Centre 318 entitled "Climatically relevant processes in the system ocean-atmosphere-ice" which is funded by the German Research Foundation and established at the University of Hamburg. The expedition took place in the Norwegian Sea between Northern Norway, Bear Island and Jan Mayen during the period 17 February until 15 March 1991. The main aim of the experiment was the investigation of cold air outbreaks from the surrounding Arctic ice sheets. During such weather episodes the air mass coming from the ice is rapidly modified over the water due to the contrasts in temperature, heat conduction, humidity and roughness between ice and water. This leads to the formation of a "new" boundary layer. Its depth, mean temperature and moisture increases with increasing distance from the ice edge mainly due to sensible and latent heat supply from the ocean. The investigations of cold air outbreaks and Arctic stratus by scientists of the Collaborative Research Centre 318 began already three years before with the field experiment ARKTIS 1988 which took place in the area west of Spitsbergen in May 1988. ARKTIS 1991 is a continuation of this work under winterly weather conditions. ARKTIS 1991 was followed by the experiment ARKTIS 1993. As in ARKTIS 1988 the research vessel Valdivia and the two research aircraft FALCON-20 of the DLR at Oberpfaffenhofen and DO-128 of the TU Braunschweig were at our disposal. Radiosonde measurements were performed on board of RV Valdivia and on Bear Island. Dr. Gerd Müller University of Hamburg http://www.mi.uni-hamburg.de/ pointOfContact tar-File(s) arctic buoy ice observational data radiosonde ship scientific use: For scientific use only eng; USA 3.0 22.0 69.0 75.0 calendrical 1991-02-17 1991-03-15 air_pressure air_pressure [CF-Standard Name]; unit: hPa relative_humidity relative_humidity [CF-Standard Name]; unit: not filled height Height is the vertical distance above the surface. [CF-Standard Name]; unit: m wind_speed Speed is the magnitude of velocity. Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) The wind speed is the magnitude of the wind velocity.[CF-Standard Name]; unit: m s-1 specific_humidity "specific" means per unit mass. Specific humidity is the mass fraction of water vapor in (moist) air.[CF-Standard Name]; unit: g kg-1 height Height is the vertical distance above the surface. [CF-Standard Name]; unit: m wind_from_direction Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) In meteorological reports, the direction of the wind vector is usually (but not always) given as the direction from which it is blowing (wind_from_direction) (westerly, northerly, etc.). In other contexts, such as atmospheric modelling, it is often natural to give the direction in the usual manner of vectors as the heading or the direction to which it is blowing (wind_to_direction) (eastward, southward, etc.) "from_direction" is used in the construction X_from_direction and indicates the direction from which the velocity vector of X is coming. [CF-Standard Name]; unit: degree air_temperature Air temperature is the bulk temperature of the air, not the surface (skin) temperature. [CF-Standard Name]; unit: not filled wind_from_direction Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) In meteorological reports, the direction of the wind vector is usually (but not always) given as the direction from which it is blowing (wind_from_direction) (westerly, northerly, etc.). In other contexts, such as atmospheric modelling, it is often natural to give the direction in the usual manner of vectors as the heading or the direction to which it is blowing (wind_to_direction) (eastward, southward, etc.) "from_direction" is used in the construction X_from_direction and indicates the direction from which the velocity vector of X is coming. [CF-Standard Name]; unit: degree air_pressure air_pressure [CF-Standard Name]; unit: hPa relative_humidity relative_humidity [CF-Standard Name]; unit: not filled air_temperature Air temperature is the bulk temperature of the air, not the surface (skin) temperature. [CF-Standard Name]; unit: not filled wind_speed Speed is the magnitude of velocity. Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) The wind speed is the magnitude of the wind velocity.[CF-Standard Name]; unit: m s-1 dew_point_temperature Dew point temperature is the temperature at which a parcel of air reaches saturation upon being cooled at constant pressure and specific humidity. [CF-Standard Name]; unit: not filled specific_humidity "specific" means per unit mass. Specific humidity is the mass fraction of water vapor in (moist) air.[CF-Standard Name]; unit: g kg-1 dew_point_temperature Dew point temperature is the temperature at which a parcel of air reaches saturation upon being cooled at constant pressure and specific humidity. [CF-Standard Name]; unit: not filled tar-File(s) 5 https://www.wdc-climate.de/ui/entry?acronym=UNI_HH_MI_ARKTIS1991 information collection n/a None n/a None