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Sedimentary record of climate change in a high latitude fjord—Kongsfjord
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作者 Hang Wu Binbin Deng +5 位作者 Jinlong Wang Sheng Zeng Juan Du Peng Yu Qianqian Bi Jinzhou Du 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2023年第1期91-102,共12页
The sedimentary record of climate change in the Arctic region is useful for understanding global warming.Kongsfjord is located in the subpolar region of the Arctic and is a suitable site for studying climate change.Gl... The sedimentary record of climate change in the Arctic region is useful for understanding global warming.Kongsfjord is located in the subpolar region of the Arctic and is a suitable site for studying climate change.Glacier retreat is occurring in this region due to climate change,leading to an increase in meltwater outflow with a high debris content.In August 2017,we collected a sediment Core Z3 from the central fjord near the Yellow River Station.Then,we used the widely used chronology method of 210Pb,^(137)Cs,and other parameters to reflect the climate change record in the sedimentary environment of Kongsfjord.The results showed that after the mid-late 1990s,the mass accumulation rate of this core increased from 0.10 g/(cm^(2)·a)to 0.34 g/(cm^(2)·a),while the flux of^(210)Pb_(ex)increased from 125 Bq/(m^(2)·a)to 316 Bq/(m^(2)·a).The higher sedimentary inventory of^(210)Pb_(ex)in Kongsfjord compared to global fallout might have been caused by sediment focusing,boundary scavenging,and riverine input.Similarities between the inventory of^(137)Cs and global fallout indicated that terrestrial particulate matter was the main source of^(137)Cs in fjord sediments.The sedimentation rate increased after 1997,possibly due to the increased influx of glacial meltwater containing debris.In addition,the^(137)Cs activity,percentage of organic carbon(OC),and OC/total nitrogen concentration ratio showed increasing trends toward the top of the core since 1997,corresponding to a decrease in the mass balance of glaciers in the region.The results ofδ^(13)C,δ^(15)N and OC/TN concentration ratio showed both terrestrial and marine sources contributed to the organic matter in Core Z3.The relative contribution of terrestrial organic matter which was calculated by a two-endmember model showed an increased trend since mid-1990s.All these data indicate that global climate change has a significant impact on Arctic glaciers. 展开更多
关键词 Kongsfjord RADIONUcLIDE organic carbon/total nitrogen(Oc/TN)concentration ratio ^δ^(13)c ^δ^(15)N sediment record climate change
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δ^(13)C values and hydrogen index records in sediment organic matter of RH core of Zoige Basin,eastern Qing-Zang(Tibet)Plateau and their environmental significance 被引量:2
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作者 张平中 王先彬 +2 位作者 陈践发 李春园 王苏民 《Science China Chemistry》 SCIE EI CAS 1995年第8期1015-1024,共10页
Total organic carbon (TOC) content correlates very well with hydrogen index (HI) in the sedi- ments of RH core in the Zoig Basin.And the δ^(13)C values of TOC become more positive while both TOC content and HI declin... Total organic carbon (TOC) content correlates very well with hydrogen index (HI) in the sedi- ments of RH core in the Zoig Basin.And the δ^(13)C values of TOC become more positive while both TOC content and HI decline,indicating the subaerial exposure or the lake sedimonts approaching to the water lev- el.On the basis of the above,RH core sediments are divided into 23 climatic fluctuation stages, including 12 warm-humid stages and 11 dry-cold stages,which can he compared with oceanic oxygen isotope stages,loess profile and polar ice-core records. 展开更多
关键词 total organic carbon and hydrogen index STAGES ^δ^(13)c values PALAEOcLIMATE Zoige Basin
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