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Controls on seasonal variations of silicate weathering and CO 2 consumption in two river catchments on the NE Tibetan Plateau

Zhang, Fei; Jin, Zhangdong; Li, Fuchun; Yu, Jimin; Xiao, Jun

Description

Water samples from the Buha and Shaliu Rivers, located on the semi-arid northeastern Tibetan Plateau, were collected weekly over a one year period. The major ionic compositions of water samples were measured and the daily contents of suspended particulate material (SPM) were monitored in both rivers in order to investigate the influence of lithology, climate and physical erosion on seasonal silicate weathering. In the Shaliu River, weathering of trace amounts of calcite contributes more than...[Show more]

dc.contributor.authorZhang, Fei
dc.contributor.authorJin, Zhangdong
dc.contributor.authorLi, Fuchun
dc.contributor.authorYu, Jimin
dc.contributor.authorXiao, Jun
dc.date.accessioned2015-12-13T22:28:34Z
dc.identifier.issn1367-9120
dc.identifier.urihttp://hdl.handle.net/1885/74256
dc.description.abstractWater samples from the Buha and Shaliu Rivers, located on the semi-arid northeastern Tibetan Plateau, were collected weekly over a one year period. The major ionic compositions of water samples were measured and the daily contents of suspended particulate material (SPM) were monitored in both rivers in order to investigate the influence of lithology, climate and physical erosion on seasonal silicate weathering. In the Shaliu River, weathering of trace amounts of calcite contributes more than 50% of the Ca2+ and HCO3- to the river water. Through high-resolution variations of Ca2+ concentrations and elemental ratios, the signal of carbonate precipitation is captured at the end of monsoon in this river. The measured physical erosion rate is only 8.7-16.0mm/kyr in this semi-arid region, which is 2-3 orders of magnitude lower than that in the Himalaya and nearby regions.In contrast with several orders of magnitude in seasonal variations of silicate weathering rates in both catchments, the distinct lithology between the catchments only leads to a 15 times difference of annual net CO2 consumption. The correlation analysis shows that seasonal silicate weathering is strongly dependent on water discharge in the semi-arid area. The most important observation is that, unrecognized by the previous studies, both physical erosion rate and air temperature exhibit two distinct trends with silicate weathering rates (and net CO2 consumption) during the years. The two trends might suggest that temperature plays a more important role on the CO2 consumption rate before the mid-monsoon under a condition of low water discharge than that after the monsoon with a high water discharge. During the period before the mid-monsoon, the relationship between temperature and silicate weathering rate exhibits higher activation energy than after the mid-monsoon, suggesting a greater dissolution of uneasily weatherable minerals from groundwater, frozen soil, and/or dust input. The relationship between erosion and weathering during the period before the mid-monsoon indicates a faster increase of silicate weathering rate, because freezing erosion produces large amount of high surface area minerals.
dc.publisherPergamon-Elsevier Ltd
dc.sourceJournal of Asian Earth Sciences
dc.subjectKeywords: carbon dioxide; climate effect; erosion; ionic composition; lithology; river water; seasonal variation; silicate; suspended particulate matter; weathering; Buha River; China; Qinghai; Qinghai-Xizang Plateau; Shaliu River Climate; CO2 consumption; Erosion; Lithology; Seasonal variation; Weathering
dc.titleControls on seasonal variations of silicate weathering and CO 2 consumption in two river catchments on the NE Tibetan Plateau
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume62
dc.date.issued2013
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.ariespublicationf5625xPUB4034
local.type.statusPublished Version
local.contributor.affiliationZhang, Fei, Chinese Academy of Sciences
local.contributor.affiliationJin, Zhangdong, Chinese Academy of Sciences
local.contributor.affiliationLi, Fuchun, Nanjing Agricultural University
local.contributor.affiliationYu, Jimin, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationXiao, Jun, Chinese Academy of Sciences
local.description.embargo2037-12-31
local.bibliographicCitation.startpage547
local.bibliographicCitation.lastpage560
local.identifier.doi10.1016/j.jseaes.2012.11.004
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2016-02-24T09:20:20Z
local.identifier.scopusID2-s2.0-84872824962
local.identifier.thomsonID000315076500042
CollectionsANU Research Publications

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