DOI: 10.1002/2015GB005237
Scopus记录号: 2-s2.0-84958781124
论文题名: The Greenland Ice Sheet as a hot spot of phosphorus weathering and export in the Arctic
作者: Hawkings J ; , Wadham J ; , Tranter M ; , Telling J ; , Bagshaw E ; , Beaton A ; , Simmons S ; -L ; , Chandler D ; , Tedstone A ; , Nienow P
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 2 起始页码: 191
结束页码: 210
语种: 英语
英文关键词: biogeochemistry
; cryosphere
; glaciology
; nutrient cycles
; nutrient export
; phosphorus
Scopus关键词: biogeochemistry
; cryosphere
; glaciology
; ice sheet
; nutrient cycling
; phosphorus
; phosphorus cycle
; river basin
; river discharge
; Arctic
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: The contribution of ice sheets to the global biogeochemical cycle of phosphorus is largely unknown, due to the lack of field data. Here we present the first comprehensive study of phosphorus export from two Greenland Ice Sheet glaciers. Our results indicate that the ice sheet is a hot spot of phosphorus export in the Arctic. Soluble reactive phosphorus (SRP) concentrations, up to 0.35 μM, are similar to those observed in Arctic rivers. Yields of SRP are among the highest in the literature, with denudation rates of 17-27 kg P km-2 yr-1. Particulate phases, as with nonglaciated catchments, dominate phosphorus export (>97% of total phosphorus flux). The labile particulate fraction differs between the two glaciers studied, with significantly higher yields found at the larger glacier (57.3 versus 8.3 kg P km-2 yr-1). Total phosphorus yields are an order of magnitude higher than riverine values reported in the literature. We estimate that the ice sheet contributes ∼15% of total bioavailable phosphorus input to the Arctic oceans (∼11 Gg yr-1) and dominates total phosphorus input (408 Gg yr-1), which is more than 3 times that estimated from Arctic rivers (126 Gg yr-1). We predict that these fluxes will rise with increasing ice sheet freshwater discharge in the future. ©2016. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77880
Appears in Collections: 气候变化事实与影响
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作者单位: Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol, United Kingdom; School of Earth and Ocean Sciences, Cardiff University, Cardiff, United Kingdom; National Oceanography Centre, University of Southampton, Southampton, United Kingdom; School of Geoscience, University of Edinburgh, Edinburgh, United Kingdom
Recommended Citation:
Hawkings J,, Wadham J,, Tranter M,et al. The Greenland Ice Sheet as a hot spot of phosphorus weathering and export in the Arctic[J]. Global Biogeochemical Cycles,2016-01-01,30(2)