Radiocarbon in the Atmosphere and Seawater in the South China Sea: Flux, Inventory and Air-Sea CO2 Exchange Rate Tracing

doi:10.1029/2021JG006380

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	Radiocarbon in the Atmosphere and Seawater in the South China Sea: Flux, Inventory and Air-Sea CO2 Exchange Rate Tracing
	Niu, Zhenchuan 1,2,3,4; Zhou, Weijian 1,2,3; Zhao, Huiyizhe 1,3; Feng, Xue 1,5; Lyu, Mengni 1,5
通讯作者	Niu, Zhenchuan(niuzc@ieecas.cn)
	2022-03-01
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN	2169-8953
卷号	127 期号:3 页码:12
摘要	Delta C-14 values of the atmosphere and seawater dissolved inorganic carbon (DIC) were measured during a cruise in the South China Sea (SCS) in September 2015, in order to determine the C-14 flux and bomb C-14-based air-sea CO2 exchange rates for this region. The background atmospheric Delta C-14 value (13.8 +/- 5.0 parts per thousand) for the SCS during that period was lower than that (35.4 +/- 3.4 parts per thousand) of surface seawater (5 m) DIC, and a net transfer of C-14 from the sea to the atmosphere (7.4 +/- 5.0 x 10(11) atoms m(-2) yr(-1)) was determined at the wind speed of 5.2 +/- 1.7 m s(-1). Seawater DIC Delta C-14 profiles showed the highest value (37.9 +/- 3.7 parts per thousand) at a depth of 100 m, a rapid decrease below that depth to -220.3 +/- 3.2 parts per thousand at 1,500 m, and nearly constant values below 1,500 m. The average mean penetration depth of bomb C-14 was 585.5 +/- 99.2 m, and a value of 8.2 +/- 1.0 x 10(9) atoms cm(-2) was obtained for the bomb C-14 inventory in this region. Based on this inventory, a long-term (1954-2015) average air-sea CO2 exchange rate of 20.2 +/- 2.8 mol m(-2) yr(-1) was traced for the SCS. Combined with the pCO(2) measurements in this region, a net CO2 flux rate of 0.54 +/- 0.08 mol m(-2) yr(-1) was yielded for the SCS, which is comparable to the cruise measured flux (0.44 +/- 0.62 mol m(-2) yr(-1)) obtained from a synthesis study (Li et al., 2020, https://doi.org/10.1016/j.pocean.2020.102272). Our study highlights the importance of continued atmospheric and seawater C-14 observations on determining the air-sea flux in this region.
关键词	radiocarbon air-sea CO2 exchange rate seawater bomb C-14 inventory South China sea
DOI	10.1029/2021JG006380
关键词[WOS]	CARBON-DIOXIDE ; TEMPORAL VARIATIONS ; BOMB RADIOCARBON ; SURFACE-WATER ; GAS-EXCHANGE ; WIND-SPEED ; C-14 ; OCEAN ; GEOSECS ; CIRCULATION
收录类别	SCI ; SCI
语种	英语
资助项目	National Natural Science Foundation of China[41773141] ; National Natural Science Foundation of China[42173082] ; National Natural Science Foundation of China[41730108] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA23010302] ; Chinese Academy of Sciences[QYZDY-SSW-DQC001] ; Chinese Academy of Sciences[ZDBS-SSW-DQC001] ; Chinese Academy of Sciences[Y354011480] ; Chinese Academy of Sciences[SKLLQGPY1610] ; Natural Science Basic Research Program of Shaanxi[2019JCW-20] ; Natural Science Foundation of Shaanxi[2014JQ2-4018]
WOS研究方向	Environmental Sciences & Ecology ; Geology
项目资助者	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Chinese Academy of Sciences ; Natural Science Basic Research Program of Shaanxi ; Natural Science Foundation of Shaanxi
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS记录号	WOS:000777487700022
出版者	AMER GEOPHYSICAL UNION
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/17647
专题	加速器质谱中心
通讯作者	Niu, Zhenchuan
作者单位	1.Chinese Acad Sci, CAS Ctr Excellence Quaternary Sci & Global Change, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Peoples R China 2.Pilot Natl Lab Marine Sci & Technol Qingdao, Open Studio Ocean Continental Climate & Environm, Qingdao, Peoples R China 3.Joint Xian AMS Ctr IEECAS & Xian Jiaotong Univ, Shaanxi Prov Key Lab Accelerator Mass Spectrometr, Xian, Peoples R China 4.Natl Observat & Res Stn Reg Ecol Environm Change, Xian, Peoples R China 5.Xian Inst Innovat Earth Environm Res, Xian, Peoples R China
推荐引用方式 GB/T 7714	Niu, Zhenchuan,Zhou, Weijian,Zhao, Huiyizhe,et al. Radiocarbon in the Atmosphere and Seawater in the South China Sea: Flux, Inventory and Air-Sea CO2 Exchange Rate Tracing[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2022,127(3):12.
APA	Niu, Zhenchuan,Zhou, Weijian,Zhao, Huiyizhe,Feng, Xue,&Lyu, Mengni.(2022).Radiocarbon in the Atmosphere and Seawater in the South China Sea: Flux, Inventory and Air-Sea CO2 Exchange Rate Tracing.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,127(3),12.
MLA	Niu, Zhenchuan,et al."Radiocarbon in the Atmosphere and Seawater in the South China Sea: Flux, Inventory and Air-Sea CO2 Exchange Rate Tracing".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 127.3(2022):12.