The effect of warming climate on nutrient and solute export from the Greenland Ice Sheet
The effect of warming climate on nutrient and solute export from the Greenland Ice Sheet
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DOI：
10.7185/geochemlet.1510
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发表时间：
2015-01-01
影响因子：
4.9
通讯作者：
Telling, J.
中科院分区：
文献类型：
--
作者：
Hawkings, J. R.;Wadham, J. L.;Telling, J.
冰川融水径流可能是限制下游初级生产者营养的重要来源。这对格陵兰冰盖周围的地区具有特别重要的意义，格陵兰冰盖每年排放超过400公里（3）的融水。北极正在迅速变暖，但更高的排放量对营养输出的影响尚不清楚。我们提出了四年的水文和地球化学数据，从一个大的格陵兰冰盖集水区，其中包括两个最高的融化年记录（2010年，2012年）。测量结果显示，溶解溶质（主要离子）和估计溶解的常量营养素（氮，磷和硅）通量的显着变化，在较高的融化年增加。不稳定的颗粒宏量营养素占营养素输出的主导地位，约占氮的50%，磷和二氧化硅的> 80%。冰盖营养输出的反应，以加强融化在很大程度上是由颗粒约束的营养物质，未来的供应是不确定的。我们认为格陵兰冰盖为极地海洋提供了一个未被充分认识的、每年都有活力的营养源，融水排放的变化可能会在未来几十年影响海洋初级生产力。
Glacial meltwater runoff is likely an important source of limiting nutrients for downstream primary producers. This has particular significance for regions surrounding the Greenland Ice Sheet, which discharges > 400 km(3) of meltwater annually. The Arctic is warming rapidly but the impact of higher discharge on nutrient export is unknown. We present four years of hydrological and geochemical data from a large Greenland Ice Sheet catchment that includes the two highest melt years on record (2010, 2012). Measurements reveal significant variation in dissolved solute (major ion) and estimated dissolved macronutrient (nitrogen, phosphorus and silica) fluxes, with increases in higher melt years. Labile particulate macronutrients dominate nutrient export, accounting for similar to 50 % of nitrogen and > 80 % of both phosphorus and silica. The response of ice sheet nutrient export to enhanced melting is largely controlled by particle bound nutrients, the future supply of which is uncertain. We propose that the Greenland Ice Sheet provides an underappreciated and annually dynamic source of nutrients for the polar oceans, with changes in meltwater discharge likely to impact marine primary productivity in future decades.