Increasing Alkalinity Export from Large Russian Arctic Rivers
Increasing Alkalinity Export from Large Russian Arctic Rivers
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DOI：
10.1021/acs.est.8b01051
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发表时间：
2018-08-07
影响因子：
11.4
通讯作者：
Spencer, Robert G. M.
中科院分区：
文献类型：
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作者：
Drake, Travis W.;Tank, Suzanne E.;Spencer, Robert G. M.
来自化学风化的河流碳酸盐碱度(HCO3-和CO32-)是大气二氧化碳的重要汇。北冰洋河流的碱度通量部分取决于降雨量、冻土范围、地下水流动路径和地表植被，所有这些都在气候变暖的情况下发生变化。这里我们显示，在过去的35年里，叶尼塞河和鄂毕河的碱度出口分别从225增加到642Geq yr(-1)(+185%)和从201增加到470Geq yr(-1)(+134%)；平均速度分别为11.90Geq yr(-1)和7.28Geq yr(-1)。这些增长可能是由于与气候变化和人类活动有关的一系列变化造成的，包括气温升高、降水增加、永久冻土融化、水文径流改变、植被变化和酸沉降减少。无论直接原因是什么，这些趋势都对陆地上的碳固存速度和淡水生态系统和北冰洋的缓冲能力产生了广泛影响。
Riverine carbonate alkalinity (HCO3- and CO32-) sourced from chemical weathering represents a significant sink for atmospheric CO2. Alkalinity flux from Arctic rivers is partly determined by precipitation, permafrost extent, groundwater flow paths, and surface vegetation, all of which are changing under a warming climate. Here we show that over the past three and half decades, the export of alkalinity from the Yenisei and Ob' Rivers increased from 225 to 642 Geq yr(-1) (+185%) and from 201 to 470 Geq yr(-1) (+134%); an average rate of 11.90 and 7.28 Geq yr(-1), respectively. These increases may have resulted from a suite of changes related to climate change and anthropogenic activity, including higher temperatures, increased precipitation, permafrost thaw, changes to hydrologic flow paths, shifts in vegetation, and decreased acid deposition. Regardless of the direct causes, these trends have broad implications for the rate of carbon sequestration on land and delivery of buffering capacity to freshwater ecosystems and the Arctic Ocean.