The surface reflectance of snow tussock | Page 2 | The Meteorological Society of New Zealand

The surface reflectance of snow tussock

Year: 
1993
Volume: 
13
Issue: 
2
Author(s): 
R. Brown
B. B. Fitzharris
Abstract: 

A series of albedo measurements taken over native snow tussock yielded a mean daily value of 0.20. Tussock albedo was observed to exhibit strong diurnal variation under clear sky conditions; the observed zenith angle dependence was found to be higher than taller crops such as corn. The observed zenith angle/albedo relationship was used to investigate annual and latitudinal variation in clear sky tussock albedo values. An analysis of tussock albedo dependence on atmospheric transmissivity revealed a noticeable decrease in albedo under overcast, low cloud conditions. It was estimated that these effects could amount to changes of up to -I-15% of net radiation in the middle of the day at a mid-latitudinal site.

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