DOI: 10.1029/2018JG004389
Scopus记录号: 2-s2.0-85051197848
论文题名: Typhoon-Enhanced Silicon and Nitrogen Exports in a Mountainous Catchment
作者: Su N. ; Yang S. ; Xie X.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 7 起始页码: 2270
结束页码: 2286
语种: 英语
英文关键词: chemical weathering
; isotopes
; major ions
; typhoon
英文摘要: Tropical storms play a profound role in driving global terrestrial material from continents to oceans. We investigated the continuous changes in the major ion chemistry, hydrogen and oxygen stable isotopes of water (δD and δ18O), nitrogen and oxygen stable isotopes of nitrate (δ15N-NO3 − and δ18O-NO3 −), and radiogenic strontium isotopes (87Sr/86Sr) for the Mulanxi River catchment in southeast China when a strong typhoon made landfall on the coasts to acquire a rapid increase in river discharge (~50 times). High rates of carbonate weathering and thus CO2 consumption during an intense precipitation event suggested the increased active weathering of carbonate minerals, while the release of silicate solute-rich soil waters during the storm could induce a greater relative contribution of surface weathering to the solute load, rather than active weathering of silicate bedrock. The related total dissolved Si flux of 940 t accounted for ~5.8% of the whole year, particularly revealing a flux contribution of the Si-rich soil waters for 37% at least. Additionally, we observed a significant increase in δ18O-NO3 − and a slight decrease in δ15N-NO3 − after the storm, whereas the concentrations of major elements overall recovered to pretyphoon levels. We infer that the posttyphoon change in the nitrate isotopic composition is caused by the coupled effects of nitrification and denitrification processes at the sediment-water interface, which thus modify isotopic compositions. This work expands our understanding of extreme climate events that may play in element sources and cycling processes in rivers. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113572
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Marine Geology, Tongji University, Shanghai, China; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
Recommended Citation:
Su N.,Yang S.,Xie X.. Typhoon-Enhanced Silicon and Nitrogen Exports in a Mountainous Catchment[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(7)