Radiation and Cloud Observations on a High Arctic plateau Ice Cap

• Main Authors: Serreze, M. C., Bradley, Raymond S
• Format: Text
• Language: unknown
• Published: SelectedWorks 1987
• Subjects: Earth Sciences; Arctic; Ellesmere Island; albedo; Ice cap
• Online Access: https://works.bepress.com/raymond_bradley/48; https://works.bepress.com/cgi/viewcontent.cgi?article=1095&context=raymond_bradley

Hourly measurements of incoming short-wave and long-wave radiation, surface albedo, and net radiation were made on and around a plateau ice cap on north-eastern Ellesmere Island during the summers of 1982 and 1983. These data were stratified by cloud type and amount. All cloud types increased incoming long-wave radiation, especially low dense clouds, fog, and clouds associated with snowfall. Relative transmission of incoming short-wave radiation, expressed as a percentage of clear-sky radiation receipts, was high for all cloud types compared to clouds at lower latitudes. With high surface albedo (~0.75), net radiation was strongly and positively correlated with net long-wave radiation but showed little relationship to net short-wave radiation. By contrast, with low surface albedo «(0.20) net radiation was negatively correlated with net long-wave radiation but positively correlated with net shortwave radiation. Under high-albedo conditions, an increase in cloudiness led to higher values of net radiation but under low-albedo conditions net radiation decreased as cloud cover increased. Survival of a snow cover would seem to be favoured if the seasonal decline in albedo is accompanied by a corresponding increase in cloudiness.