Concentration-discharge patterns of weathering products from global rivers

摘要：

　　Quantifying the functional relationships relating river discharge and weathering products places key constraints on the negative feedback between the silicate weathering and climate.In this study we analyze the concentration-discharge relationships of weathering products from global rivers using previously compiled time-series datasets for concentrations and discharge from global rivers.To analyze the nature of the covariation between specific discharge and concentrations,we use both a power law equation and a recently developed solute production equation.The solute production equation allows us to quantify weathering efficiency,or the resistance to dilution at high runoff,via the Damk?hler coefficient.These results are also compared to those derived using average concentration-discharge pairs.Both the power law exponent and the Damk?hler coefficient increase and asymptote as catchments exhibit increasingly chemostatic behavior,resulting in an inverse relationship between the two parameters.We also show that using the distribution of average concentration-discharge pairs from global rivers,rather than fitting concentration-discharge relationships for each individual river,underestimates global median weathering efficiency by up to a factor of~10.This study demonstrates the utility of long time-series sampling of global rivers to elucidate controlling processes needed to quantify patterns in global silicate weathering rates.

关键词： concentration-discharge rivers silicate weathering solutes

作者: Daniel E.Ibarra Seulgi Moon Jeremy K.Caves C.Page Chamberlain Kate Maher

作者单位: Earth System Science,Stanford University,Stanford,CA 94305-4216 USA Earth,Planetary,and Space Sciences,University of California,Los Angeles,Los Angeles,CA 90095 USA Earth Science,ETH Zürich,8092 Zürich,Switzerland Geological Sciences,Stanford University,Stanford,CA 94305-2115

会议类型: 国际会议

会议名称: The 11th International Symposium on Geochemistry of the Earths Surface(GES-11)(第十一届地球表层地球化学国际研讨会)

会议地点: 贵阳

会议语种:英文

页码: 1-5

在线出版日期: 2017-06-11（万方平台首次上网日期，不代表论文的发表时间）