DOI: 10.1002/2014GB004888
Scopus记录号: 2-s2.0-84916885014
论文题名: External total alkalinity loads versus internal generation: The influence of nonriverine alkalinity sources in the Baltic Sea
作者: Gustafsson E ; , Wällstedt T ; , Humborg C ; , Mörth C ; -M ; , Gustafsson B ; G
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 11 起始页码: 1358
结束页码: 1370
语种: 英语
Scopus关键词: alkalinity
; biogeochemistry
; carbon dioxide
; carbon sink
; chemical weathering
; estuarine front
; sediment core
; Atlantic Ocean
; Baltic Sea
; North Sea
英文摘要: In this study we first present updated riverine total alkalinity (TA) loads to the various Baltic Sea sub-basins, based on monthly measurements in 82 of the major rivers that represent 85% of the total runoff. Simulations in the coupled physical-biogeochemical BALTSEM (BAltic sea Long-Term large Scale Eutrophication Model) model show that these river loads together with North Sea water inflows are not sufficient to reproduce observed TA concentrations in the system, demonstrating the large influence from internal sources. Budget calculations indicate that the required internal TA generation must be similar to river loads in magnitude. The nonriverine source in the system amounts to about 2.4 mmolm-2 d-1 on average. We argue here that the majority of this source is related to denitrification together with unresolved sediment processes such as burial of reduced sulfur and/or silicate weathering. This hypothesis is supported by studies on sediment processes on a global scale and also by data from sediment cores in the Baltic Sea. In a model simulation with all internal TA sources and sinks switched on, the net absorption of atmospheric CO2 increased by 0.78 mol C m-2 yr-1 compared to a simulation where TA was treated as a passive tracer. Our results clearly illustrate how pelagic TA sources together with anaerobic mineralization in coastal sediments generate a significant carbon sink along the aquatic continuum, mitigating CO2 evasions from coastal and estuarine systems. ©2014. 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/77451
Appears in Collections: 气候变化事实与影响
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作者单位: Baltic Nest Institute, Baltic Sea Centre, Stockholm University, Stockholm, Sweden; Department of Applied Environmental Science, Stockholm University, Stockholm, Sweden; Department of Geological Sciences, Stockholm University, Stockholm, Sweden
Recommended Citation:
Gustafsson E,, Wällstedt T,, Humborg C,et al. External total alkalinity loads versus internal generation: The influence of nonriverine alkalinity sources in the Baltic Sea[J]. Global Biogeochemical Cycles,2014-01-01,28(11)