气候变化领域集成服务门户(CCPortal): Environmental Controls on the Riverine Export of Dissolved Black Carbon

CCPortal

DOI	10.1029/2018GB006140
	Environmental Controls on the Riverine Export of Dissolved Black Carbon
	Jones M.W.; de Aragão L.E.O.C.; Dittmar T.; de Rezende C.E.; Almeida M.G.; Johnson B.T.; Marques J.S.J.; Niggemann J.; Rangel T.P.; Quine T.A.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	849
结束页码	874
卷号	33 期号:7
英文摘要	Each year, tropical rivers export a dissolved organic carbon (DOC) flux to the global oceans that is equivalent to ~4% of the global land sink for atmospheric CO2. Among the most refractory fractions of terrigenous DOC is dissolved black carbon (DBC), which constitutes ~10% of the total DOC flux and derives from the charcoal and soot (aerosol) produced during biomass burning and fossil fuel combustion. Black carbon (BC) has disproportionate storage potential in oceanic pools and so its export has implications for the fate and residence time of terrigenous organic carbon (OC). In contrast to bulk DOC, there is limited knowledge of the environmental factors that control riverine fluxes of DBC. We thus completed a comprehensive assessment of the factors controlling DBC export in tropical rivers with catchments distributed across environmental gradients of hydrology, topography, climate, and soil properties. Generalized linear models explained 70 and 64% of the observed variance in DOC and DBC concentrations, respectively. DOC and DBC concentrations displayed coupled responses to the dominant factors controlling their riverine export (soil moisture, catchment slope, and catchment stocks of OC or BC, respectively) but varied divergently across gradients of temperature and soil properties. DBC concentrations also varied strongly with aerosol BC deposition rate, indicating further potential for deviation of DBC fluxes from those of DOC due to secondary inputs of DBC from this unmatched source. Overall, this study identifies the specific drivers of BC dynamics in river catchments and fundamentally enhances our understanding of refractory DOC export to the global oceans. ©2019. The Authors.
英文关键词	BC Aerosol; Dissolved Black Carbon; Dissolved Organic Carbon; Pyrogenic Carbon; Tropical Rivers
语种	英语
scopus关键词	aerosol; biomass burning; black carbon; carbon sink; catchment; dissolved organic carbon; environmental conditions; environmental gradient; fossil fuel; global ocean; land-atmosphere interaction; river; terrigenous deposit
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129753
作者单位	Geography Department, College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom; Geography Department, College of Science, Swansea University, Swansea, United Kingdom; Divisão de Sensoriamento Remoto, Instituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, Brazil; ICBM-MPI Bridging Group for Marine Geochemistry, Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Oldenburg, Germany; Laboratório de Ciências Ambientais, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte de Fluminense, Rio de Janeiro, Brazil; Earth System Mitigation Studies, Met Office, Exeter, United Kingdom
推荐引用方式 GB/T 7714	Jones M.W.,de Aragão L.E.O.C.,Dittmar T.,et al. Environmental Controls on the Riverine Export of Dissolved Black Carbon[J],2019,33(7).
APA	Jones M.W..,de Aragão L.E.O.C..,Dittmar T..,de Rezende C.E..,Almeida M.G..,...&Quine T.A..(2019).Environmental Controls on the Riverine Export of Dissolved Black Carbon.Global Biogeochemical Cycles,33(7).
MLA	Jones M.W.,et al."Environmental Controls on the Riverine Export of Dissolved Black Carbon".Global Biogeochemical Cycles 33.7(2019).