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wdc-climate.de:2290311 eng; USA collection UNI_HH_MI_ACSYS1998 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 2011-06-22T14:50:35 ISO 19115 ISO 19115-2:2009 ACSYS 1998 - Air mass modification in on-ice air flows north of Fram Strait: meteorological measurements of the research aircraft Falcon 2011-06-22 publication 1 UNI_HH_MI_ACSYS1998 doi:10.1594/WDCC/UNI_HH_MI_ACSYS1998 Dr. Gerd Müller University of Hamburg http://www.mi.uni-hamburg.de/ Email: gerd.mueller@zmaw.de originator Prof. Dr. Burghard Brümmer University of Hamburg http://www.mi.uni-hamburg.de/ Email: burghard.bruemmer@zmaw.de author Dr. Stefan Thiemann University of Hamburg http://www.mi.uni-hamburg.de/ Email: stefan.thiemann@uni-hamburg.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 ACSYS 1998 took place in the Greenland Sea west of Spitsbergen from 10 to 25 March 1998. It was planned and organized by scientists of the Meteorological Institute of the University of Hamburg within the national research project ACSYS (Arctic Climate System Study) which was funded by the German Bundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie (BMBF). The national ACSYS project is part of the international ACSYS research program which is a sub-program of the World Climate Research Program (WCRP). The objective of the ACSYS 1989 field experiment was the investigation of the atmospheric boundary layer in case of on-ice air flow in wintertime. Cyclones, reaching the Arctic sea ice from the Greenland Sea or Barents Sea are the strongest synoptic-scale weather signals in the Arctic region. They transport warm, moist and cloudy air from the open water to the Arctic shield. Especially in wintertime when the temperature contrast between the ocean and the ice surface is large the effects in the boundary layer over the ice are also significant. The research aircraft Falcon performed six flight missions from 11 to 21 March measuring meteorological parameters and turbulent fluxes. Dr. Gerd Müller University of Hamburg http://www.mi.uni-hamburg.de/ pointOfContact tar-File(s) DLR Falcon aircraft aircraft measurement arctic observational data scientific use: For scientific use only eng; USA -10.1682 15.6399 76.642 82.6457 calendrical 1998-03-11 1998-03-21 longitude longitude [CF-Standard Name]; unit: degree_east latitude latitude [CF-Standard Name]; unit: degree_north upward_air_velocity vertical wind velocity A velocity is a vector quantity. "Upward" indicates a vector component which is positive when directed upward (negative downward). Upward air velocity is the vertical component of the 3D air velocity vector. [CF-Standard Name]; unit: m s-1 upwelling_longwave_flux_in_air "longwave" means longwave radiation. Upwelling radiation is radiation from below. It does not mean "net upward". When thought of as being incident on a surface, a radiative flux is sometimes called "irradiance". In addition, it is identical with the quantity measured by a cosine-collector light-meter and sometimes called "vector irradiance". In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. [CF-Standard Name]; unit: W m-2 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 upwelling_shortwave_flux_in_air "shortwave" means shortwave radiation. Upwelling radiation is radiation from below. It does not mean "net upward". When thought of as being incident on a surface, a radiative flux is sometimes called "irradiance". In addition, it is identical with the quantity measured by a cosine-collector light-meter and sometimes called "vector irradiance". In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. [CF-Standard Name]; unit: W m-2 downwelling_shortwave_flux_in_air downwelling_shortwave_flux_in_air [CF-Standard Name]; unit: W m-2 surface_temperature The surface called "surface" means the lower boundary of the atmosphere. The surface temperature is the (skin) temperature at the interface, not the bulk temperature of the medium above or below. [CF-Standard Name]; unit: not filled downwelling_longwave_flux_in_air downwelling_longwave_flux_in_air [CF-Standard Name]; unit: W m-2 time time [CF-Standard Name]; unit: s air_pressure_at_sea_level sea_level means mean sea level, which is close to the geoid in sea areas. Air pressure at sea level is the quantity often abbreviated as MSLP or PMSL.[CF-Standard Name]; unit: hPa humidity_mixing_ratio Humidity mixing ratio of a parcel of moist air is the ratio of the mass of water vapor to the mass of dry air. [CF-Standard Name]; unit: g kg-1 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 height Height is the vertical distance above the surface. [CF-Standard Name]; unit: m eastward_wind "Eastward" indicates a vector component which is positive when directed eastward (negative westward). 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.) [CF-Standard Name]; unit: m s-1 air_temperature Air temperature is the bulk temperature of the air, not the surface (skin) temperature. [CF-Standard Name]; unit: not filled northward_wind "Northward" indicates a vector component which is positive when directed northward (negative southward). 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.) [CF-Standard Name]; unit: m s-1 upward_latent_heat_flux_in_air "Upward" indicates a vector component which is positive when directed upward (negative downward). In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics.[CF-Guidelines for construction] [CF-Standard Name]; unit: W m-2 upward_sensible_heat_flux_in_air "Upward" indicates a vector component which is positive when directed upward (negative downward). In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics.[CF-Guidelines for construction] [CF-Standard Name]; unit: W m-2 tar-File(s) 28 https://www.wdc-climate.de/ui/entry?acronym=UNI_HH_MI_ACSYS1998 information collection n/a None n/a None