ACSYS 1998 - Air mass modification in on-ice air flows north of Fram Strait: meteorological measurements of the research aircraft Falcon
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.
- Identification
- Distribution
- Quality
- Spatial rep.
- Ref. system
- Content
- Portrayal
- Metadata
- Md. constraints
- Md. maintenance
- Schema info
Identification
Data identification
Citation
- Date (Publication)
- 2011-06-22
- Edition
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1
- Citation identifier
- UNI_HH_MI_ACSYS1998
- Citation identifier
- doi:10.1594/WDCC/UNI_HH_MI_ACSYS1998
http://www.mi.uni-hamburg.de/
Format
- Name
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tar-File(s)
- Keywords
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DLR Falcon
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- Keywords
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aircraft
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- Keywords
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aircraft measurement
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- Keywords
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arctic
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- Keywords
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observational data
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- Use limitation
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scientific use: For scientific use only
- Language
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eng; USA
- Begin date
- 1998-03-11
- End date
- 1998-03-21
Distribution
Distribution
- Distribution format
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tar-File(s)
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tar-File(s)
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Digital transfer options
- Transfer size
- 28
- OnLine resource
- https://www.wdc-climate.de/ui/entry?acronym=UNI_HH_MI_ACSYS1998
Quality
Data quality
- Hierarchy level
- collection
Completeness commission
- Name of measure
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n/a
- Measure description
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None
Non quantitative attribute accuracy
- Name of measure
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n/a
- Measure description
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None
Content
Coverage Description
- Attribute description
- longitude
- Descriptor
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longitude [CF-Standard Name]; unit: degree_east
Coverage Description
- Attribute description
- latitude
- Descriptor
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latitude [CF-Standard Name]; unit: degree_north
Coverage Description
- Attribute description
- upward_air_velocity
- Descriptor
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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
Coverage Description
- Attribute description
- upwelling_longwave_flux_in_air
- Descriptor
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"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
Coverage Description
- Attribute description
- wind_from_direction
- Descriptor
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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
Coverage Description
- Attribute description
- upwelling_shortwave_flux_in_air
- Descriptor
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"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
Coverage Description
- Attribute description
- downwelling_shortwave_flux_in_air
- Descriptor
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downwelling_shortwave_flux_in_air [CF-Standard Name]; unit: W m-2
Coverage Description
- Attribute description
- surface_temperature
- Descriptor
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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
Coverage Description
- Attribute description
- downwelling_longwave_flux_in_air
- Descriptor
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downwelling_longwave_flux_in_air [CF-Standard Name]; unit: W m-2
Coverage Description
- Attribute description
- time
- Descriptor
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time [CF-Standard Name]; unit: s
Coverage Description
- Attribute description
- air_pressure_at_sea_level
- Descriptor
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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
Coverage Description
- Attribute description
- humidity_mixing_ratio
- Descriptor
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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
Coverage Description
- Attribute description
- wind_speed
- Descriptor
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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
Coverage Description
- Attribute description
- height
- Descriptor
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Height is the vertical distance above the surface. [CF-Standard Name]; unit: m
Coverage Description
- Attribute description
- eastward_wind
- Descriptor
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"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
Coverage Description
- Attribute description
- air_temperature
- Descriptor
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Air temperature is the bulk temperature of the air, not the surface (skin) temperature. [CF-Standard Name]; unit: not filled
Coverage Description
- Attribute description
- northward_wind
- Descriptor
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"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
Coverage Description
- Attribute description
- upward_latent_heat_flux_in_air
- Descriptor
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"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
Coverage Description
- Attribute description
- upward_sensible_heat_flux_in_air
- Descriptor
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"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
Metadata
Metadata
- File identifier
- wdc-climate.de:2290311 XML
- Metadata language
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eng; USA
- Hierarchy level
- collection
- Hierarchy level name
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UNI_HH_MI_ACSYS1998
- Date stamp
- 2011-06-22T14:50:35
- Metadata standard name
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ISO 19115
- Metadata standard version
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ISO 19115-2:2009
Overviews
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