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Metadata

  • Station or site: CryoNet Station
  • Type: Primary
  • Attribute(s): Research
  • WMO ID (if any):
  • Shape: point
  • Latitude, longitude: 78.0517, -67.6283
  • Altitude and/or range (m): 1490
  • Landscape: Icesheet
  • Year established: 2012
  • Year-round? Yes
  • Operations contact: Teruo Aoki
  • Science contact: Teruo Aoki
  • Data contact: Hironori Yabuki
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SIGMA-A
Primary CryoNet Station Information

The SIGMA-A site is located on northwest Greenland ice sheet. The surface condition is snow through a whole year. An automatic weather station (AWS) was installed on 28 June 2014. In summer seasons after 2012 short-term intensive meteorological and glaciological observations were carried out. The characteristics of the SIGMA-A AWS are (1) two-level measurements of air temperature, relative humidity, wind speed and direction; (2) net radiation measurements in the shortwave, the near-infrared (NIR) and longwave spectral regions; (3) monitoring of the frost condition on the radiation sensors and the snow surface condition with two interval cameras; and (4) tilt angle monitoring of the main AWS pole with an inclinometer. A net radiometer sensor and NIR pyranometers were respectively set on other mounts separated from the main AWS pole. For all instruments, one-minute sampling and ten-minute averaged data are stored on a data logger, and the hourly data are transported to us via Argos satellite. The electric power is supplied from cyclone batteries in the snow, which are charged by solar panels.

Other Networks to Which This CryoNet Station Belongs

Measurement Methods Used

Data Information

Publications

Aoki, T., Matoba, S., Uetake, J., Takeuchi N. and Motoyama H. (2014): Field activities of the "Snow Impurity and Glacial Microbe effects on abrupt warming in the Arctic" (SIGMA) Project in Greenland in 2011-2013. Bull. Glaciol. Res., 32, doi:10.5331/bgr.32.3, 3-20.

Aoki, T., Matoba, S., Yamaguchi, S., Tanikawa, T., Niwano, M., Kuchiki, K., Adachi, K., Uetake, J., Motoyama, H. and Hori, M. (2014): Light-absorbing snow impurity concentrations measured on Northwest Greenland ice sheet in 2011 and 2012. Bull. Glaciol. Res., 32, doi:10.5331/bgr.32.21, 21-31.

Yamaguchi, S., S. Matoba, T. Yamazaki, A. Tsushima, M. Niwano, T. Tanikawa and T. Aoki, 2014: Glaciological observations in 2012 and 2013 at SIGMA-A site, Northwest Greenland, Bull. Glaciol. Res., 32, 95-105, doi:10.5331/bgr.32.95.

Niwano, M., Aoki, T., Matoba, S., Yamaguchi, S., Tanikawa, T., Kuchiki, K., and Motoyama, H. (2015): Numerical simulation of extreme snowmelt observed at the SIGMA-A site, northwest Greenland, during summer 2012, The Cryosphere, 9, 971-988, doi:10.5194/tc-9-971-2015.

Additional Information Documents

Measurements

The measurements made at SIGMA-A are listed in the following tables. (Note: If End Year is blank, measurements are ongoing.)

Cryosphere Measurements

Element Variable Start Year End Year Frequency
SnowDepth2012Continuous
SnowSnowpack profile2012Continuous
SnowAlbedo2014Continuous
SnowChemistrySporadic
IcesheetSurface accumulation2012Continuous
IcesheetSurface velocity2014Sporadic
IcesheetInternal temperature2012
IcesheetSurface elevation2014Sporadic
IcesheetInternal layeringSporadic
IcesheetSurface temperature2012Continuous
IcesheetSurface albedo2012Continuous

Atmosphere Measurements

Element Variable Start Year End Year Frequency
MetAir temperature2012Continuous
MetHumidity/vapour pressure2012Continuous
MetWind speed and direction2012
MetAir pressure2012
MetSnowfall2012Continuous
MetSensible and latent heat2012Continuous
RadiationDownwelling shortwave2012
RadiationUpwelling shortwave2012
RadiationDownwelling longwave2012
RadiationUpwelling longwave2012

Measurement Notes and Other Measurements

Category Description or List
AtmosphereWind, temperature and humidity are are measured at two heights. Upwelling and downwelling NIR radiation components are measured since 2012.

Last updated: 31 May 2017