Radon-traced pore-water as a potential source of CO2 and CH4 to receding black and clear water environments in the Amazon Basin

被引：19

作者：

Call, Mitchell ^{[1
,2
]}

Sanders, Christian J. ^{[1
]}

Enrich-Prast, Alex ^{[3
,4
,5
]}

Sanders, Luciana ^{[2
]}

Marotta, Humberto ^{[5
,6
]}

Santos, Isaac R. ^{[1
]}

Maher, Damien T. ^{[1
,2
]}

机构：

[1] Southern Cross Univ, Sch Environm Sci & Engn, Natl Marine Sci Ctr, Coffs Harbour, NSW, Australia

[2] Southern Cross Univ, Southern Cross Geosci, Lismore, NSW, Australia

[3] Linkoping Univ, Dept Environm Change, Linkoping, Sweden

[4] Univ Fed Rio de Janeiro, Dept Bot, Rio De Janeiro, Brazil

[5] Univ Fed Fluminense, Grad Program Geosci Environm Geochem, Biomass & Water Management Res Ctr NAB UFF, Ecosyst & Global Change Lab LEMG UFF,Int Lab Glob, Niteroi, RJ, Brazil

[6] Univ Fed Fluminense, Grad Program Geog, Dept Geog, Sedimentary & Environm Proc Lab LAPSA UFF, Niteroi, RJ, Brazil

来源：

LIMNOLOGY AND OCEANOGRAPHY LETTERS | 2018年 / 3卷 / 05期

基金：

澳大利亚研究理事会;

关键词：

CARBON-DIOXIDE; METHANE EMISSIONS; TEMPORAL VARIABILITY; GREENHOUSE GASES; RIVER; FLOODPLAIN; DYNAMICS; SOLIMOES; WETLANDS; BALANCE;

D O I：

10.1002/lol2.10089

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Groundwater is a primary source of dissolved CO2 and CH4 in Amazonian headwaters, yet in higher order rivers, a groundwater/pore-water source is difficult to constrain due to the high spatial and temporal heterogeneity of pore-water exchange. Here, we report coupled, high resolution measurements of pCO(2), CH4, and Rn-222 (a natural pore-water and groundwater tracer) during receding waters in the three major water types of the Central Amazon Basin: black (Negro River); clear (Tapajos River); white (Madeira River). Considerable spatial heterogeneity was observed in pCO(2), CH4, and Rn-222 concentrations ranging from 460 mu atm to 8030 mu atm, 7 nM to 281 nM, and 713 dpm m(-3) to 8516 dpm m(-3), respectively. The significant correlations between pCO(2) and CH4 to Rn-222 in the black and clear waters suggests that pore-water further enhanced CO2 supersaturation by 18-47% and is a driver of CH4 dynamics in these waters.

引用

页码：375 / 383

页数：9

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