Surface energy balance in the ablation zone of Langfjordjøkelen, an arctic, maritime glacier in northern Norway
Surface energy balance in the ablation zone of Langfjordjøkelen, an arctic, maritime glacier in northern Norway
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DOI：
10.3189/2014jog13j063
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发表时间：
2014
影响因子：
3.4
通讯作者：
R. Giesen;L. Andreassen;J. Oerlemans;M. R. van den Broeke
中科院分区：
文献类型：
--
作者：
R. Giesen;L. Andreassen;J. Oerlemans;M. R. van den Broeke
摘要挪威北方和南方的冰川受到不同的太阳辐射日周期和季节周期的影响，这可能反映在净太阳辐射在其表面能量平衡中的重要性上。我们提出了一个3年的连续记录，从一个自动气象站在消融区的冰帽Langfjordjøkelen，挪威大陆最北端的冰川之一。尽管朗菲约克伦位于北纬70度，但它属于海洋性气候，年平均气温为-1.08摄氏度，经常有云层覆盖，冬末积雪深度在三年中均超过3米。主要的融化季节是5月至10月，但偶尔会在温暖多云的冬季发生融化事件。净太阳辐射和长波辐射共占58%的熔体能量，净长波辐射的积极贡献（7%）。感热和潜热通量提供了熔体能量的剩余部分。云光学厚度Langfjordjøkelen大于挪威南部的两个冰川，特别是在夏季。这导致了太阳净辐射对朗菲约克伦表面融化的贡献较小;较高纬度对太阳净辐射的影响很小。
Abstract Glaciers in northern and southern Norway are subject to different daily and seasonal cycles of incoming solar radiation, which is presumably reflected in the importance of net solar radiation in their surface energy balance. We present a 3 year continuous record from an automatic weather station in the ablation zone of the ice cap Langfjordjøkelen, one of the most northerly glaciers of mainland Norway. Despite its location at 70º N, Langfjordjøkelen was found to have a maritime climate, with an annual mean air temperature of –1.08C, frequent cloud cover and end-of-winter snow depths over 3 m in all three years. The main melt season was May–October, but occasional melt events occurred on warm, cloudy winter days. Net solar and longwave radiation together accounted for 58% of the melt energy, with a positive contribution by net longwave radiation (7%). The sensible and latent heat fluxes supplied the remainder of the melt energy. Cloud optical thickness over Langfjordjøkelen was larger than on two glaciers in southern Norway, especially in the summer months. This resulted in a smaller contribution of net solar radiation to surface melt on Langfjordjøkelen; the effect of the higher latitude on net solar radiation was found to be small.