The spatio-temporal distribution of the albedos and its relationship with glacier mass balance in the glaciers of the Greater Caucasus Mountains
This study investigates the spatio-temporal characteristics of albedo on the Garabashi Glacier and the Djankuat Glacier in the Greater Caucasus Mountains,utilizing MOD10A1 and MYD10A1 snow/ice albedo data.Five albedo aggregation methods are applied to explore the relationship between albedos and glacier mass balance during summer from 2002 to 2019.The results reveal a clear decreasing trend in albedos retrieved from the two glaciers over the study period,with the lowest albedos observed during summer.The Garabashi Glacier exhibits the highest albedos in winter,whereas the Djankuat Glacier shows the highest albedos in spring.The variation of summer albedos between high and low altitude areas is more pronounced in the Garabashi Glacier than in the Djankuat Glacier.The summer mass balance is positively correlated with the summer albedos in both glaciers,particularly for the Garabashi Glacier.The correlation coefficient for the Garabashi Glacier reaches up to 0.874(p＜0.05)by employing the average minimum albedo aggregation method,while for the Djankuat Glacier,it is 0.765(p＜0.05)by utilizing the weighted average albedo aggregation method.The lower correlation of the Djankuat Glacier may be attributed to its aspect and low altitude,which make it more susceptible to warm and humid airflow,resulting in a relatively lower proportion of shortwave radiant energy in glacier melting and indicating a small influence of albedo on its ablation.
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