Modelling mass and energy exchange over polar snow using the DAISY model

In the Antarctic winter of 1991 an extensive series of micro- meteorological and snow cover measurements were made as part of the second Stable Boundary Layer Experiment (STABLE II) at Halley Station on the Brunt Ice Shelf, Antarctica, These data have been used to validate the DAISY distributed snow model using parameter values deter­ mined by calibration using independent data collected at Halley during the International Geophysical Year 1957/1958. These "effective" para­ meter values are consistent with values determined by other independent field and laboratory experiments on polar snow. Simulation of the STABLE data is successful except during periods of very high stability in the boundary layer. A better simulation of the snow surface tempera­ ture is obtained by using a roughness length of 5 cm for heat and water vapour transport rather than the value of 0.01 cm used for the aero­ dynamic roughness length. This suggests that the magnitude of turbulent heat and mass transfer may be larger than hitherto assumed in modelling the response of polar snow to climate change.


Publication status:
Authors: Morris, E.M., Anderson, P.S., Bader, H.-P., Weilnmann, P., Blight, C.

Editors: Jones, H.G., Davies, T.D., Ohmura, A., Morris, E.M.

1 January, 1994
In: Jones, H.G., Davies, T.D., Ohmura, A., Morris, E.M. (eds.). Snow and ice covers: interactions with the atmosphere and ecosystems. Proceedings of Yokohama Symposium J2 and J5, July 1993, Wallingford, International Association of Hydrological Sciences, 53-60.