Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/135816
Title: RIVERINE ORGANIC CARBON DEGRADATION AND CO2 EMISSION FROM YANGTZE RIVER, CHINA
Authors: LIU SHAODA
Keywords: organic carbon, carbon dioxide, inland waters, hydrology, geomorphology, regional carbon cycling
Issue Date: 3-Jan-2017
Citation: LIU SHAODA (2017-01-03). RIVERINE ORGANIC CARBON DEGRADATION AND CO2 EMISSION FROM YANGTZE RIVER, CHINA. ScholarBank@NUS Repository.
Abstract: Global river networks are found to be supersaturated with CO2 and act as essential sources of CO2 to the atmosphere. Although previous research has demonstrated ubiquity of this phenomenon in rivers around the world, various mysteries behind riverine CO2 supersaturation and essential processes governing CO2 emission from rivers remain largely unanswered. In this research, relying on data collected from multiple sources, I demonstrate (1) the spatiotemporal distribution of CO2 and its environmental controls by related catchment properties; (2) the hydrological and geomorphological controls on channel CO2 emission; (3) influences of increasing river impounding on biogeochemical composition of riverine organic matter and CO2 emission. Water-column respiration of river organic carbon alone is demonstrated not sufficient to sustain current pCO2 and CO2 emission rates. Instead, significant external sources including lateral soil CO2 input via groundwater and benthic respiration exist, substantiating close river-catchment connections as among the main mechanisms in sustaining riverine heterotrophy.
URI: http://scholarbank.nus.edu.sg/handle/10635/135816
Appears in Collections:Ph.D Theses (Open)

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