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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.

Simple

Date (Publication)
2011-06-22
Edition

1

Citation identifier
UNI_HH_MI_ACSYS1998
Citation identifier
doi:10.1594/WDCC/UNI_HH_MI_ACSYS1998
Originator
  University of Hamburg - Dr. Gerd Müller
http://www.mi.uni-hamburg.de/
Author
  University of Hamburg - Prof. Dr. Burghard Brümmer
http://www.mi.uni-hamburg.de/
Author
  University of Hamburg - Dr. Stefan Thiemann
http://www.mi.uni-hamburg.de/
Author
  University of Hamburg - Christian Wetzel
http://www.mi.uni-hamburg.de/
Principal investigator
  University of Hamburg - Prof. Dr. Burghard Brümmer
http://www.mi.uni-hamburg.de/
Publisher
  WDC Climate at DKRZ
Point of contact
  University of Hamburg - Dr. Gerd Müller
http://www.mi.uni-hamburg.de/
Name

tar-File(s)

Keywords
  • DLR Falcon

Keywords
  • aircraft

Keywords
  • aircraft measurement

Keywords
  • arctic

Keywords
  • observational data

Use limitation

scientific use: For scientific use only

Language

eng; USA

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Begin date
1998-03-11
End date
1998-03-21
Distribution format
  • tar-File(s) ()

Transfer size
28
OnLine resource
https://www.wdc-climate.de/ui/entry?acronym=UNI_HH_MI_ACSYS1998
Hierarchy level
collection

Completeness commission

Name of measure

n/a

Measure description

None

Non quantitative attribute accuracy

Name of measure

n/a

Measure description

None

Attribute description
longitude
Descriptor

longitude [CF-Standard Name]; unit: degree_east

Attribute description
latitude
Descriptor

latitude [CF-Standard Name]; unit: degree_north

Attribute description
upward_air_velocity
Descriptor

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

Attribute description
upwelling_longwave_flux_in_air
Descriptor

"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

Attribute description
wind_from_direction
Descriptor

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

Attribute description
upwelling_shortwave_flux_in_air
Descriptor

"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

Attribute description
downwelling_shortwave_flux_in_air
Descriptor

downwelling_shortwave_flux_in_air [CF-Standard Name]; unit: W m-2

Attribute description
surface_temperature
Descriptor

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

Attribute description
downwelling_longwave_flux_in_air
Descriptor

downwelling_longwave_flux_in_air [CF-Standard Name]; unit: W m-2

Attribute description
time
Descriptor

time [CF-Standard Name]; unit: s

Attribute description
air_pressure_at_sea_level
Descriptor

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

Attribute description
humidity_mixing_ratio
Descriptor

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

Attribute description
wind_speed
Descriptor

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

Attribute description
height
Descriptor

Height is the vertical distance above the surface. [CF-Standard Name]; unit: m

Attribute description
eastward_wind
Descriptor

"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

Attribute description
air_temperature
Descriptor

Air temperature is the bulk temperature of the air, not the surface (skin) temperature. [CF-Standard Name]; unit: not filled

Attribute description
northward_wind
Descriptor

"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

Attribute description
upward_latent_heat_flux_in_air
Descriptor

"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

Attribute description
upward_sensible_heat_flux_in_air
Descriptor

"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

File identifier
wdc-climate.de:2290311 XML
Metadata language

eng; USA

Hierarchy level
collection
Hierarchy level name

UNI_HH_MI_ACSYS1998

Date stamp
2011-06-22T14:50:35
Metadata standard name

ISO 19115

Metadata standard version

ISO 19115-2:2009

Point of contact
  University of Hamburg - Christian Wetzel
http://www.mi.uni-hamburg.de/
Point of contact
  University of Hamburg - Dr. Gerd Müller
http://www.mi.uni-hamburg.de/
 
 

Overviews

Spatial extent

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Keywords


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