气候变化领域集成服务门户(CCPortal): Global carbon budgets estimated from atmospheric O2N2 and CO2 observations in the western Pacific region over a 15-year period

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DOI	10.5194/acp-19-9269-2019
	Global carbon budgets estimated from atmospheric O2N2 and CO2 observations in the western Pacific region over a 15-year period
	Tohjima Y.; Mukai H.; MacHida T.; Hoshina Y.; Nakaoka S.-I.
发表日期	2019
ISSN	16807316
起始页码	9269
结束页码	9285
卷号	19 期号:14
英文摘要	Time series of the atmospheric O2=N2 ratio and CO2 mole fraction of flask samples obtained from the National Institute for Environmental Studies' (NIES's) flask sampling network are presented. The network includes two ground sites, Hateruma island (HAT; 24.05° N, 123.81° E) and Cape Ochiishi (COI; 43.17° N, 145.50° E), and cargo ships regularly sailing in the western Pacific. Based on temporal changes in fossil-fuel-derived CO2 emissions, global atmospheric CO2 burden and atmospheric potential oxygen (APO), which were calculated from the observed O2=N2 ratio and CO2 mole fraction according to APO D O2C1:1 × CO2, we estimated the global carbon sinks of the ocean and land biosphere for a period of more than 15 years. In this carbon budget calculation, we adopted a correction for the time-varying ocean O2 outgassing effect with an average of 0.54 PgC yr-1 for 2000-2016. The outgassing effect, attributed mainly to global ocean warming, was evaluated under the assumption that the net ocean gas flux is proportional to the change in the ocean heat content for the 0-2000 m layer. The resulting oceanic and land biotic carbon sinks were 2:6 ± 0:7 and 1:5 ± 0:9 PgC yr-1, respectively, for a 17-year period (2000-2016) and 2:4±0:7 and 1:9±0:9 PgC yr-1, respectively, for a 14-year period (2003-2016). Despite the independent approaches, the sink values of this study agreed with those estimated by the Global Carbon Project (GCP) within a difference of about ±0:4 PgC yr-1. We examined the carbon sinks for an interval of 5 years to assess the temporal trends. The pentad (5-year) ocean sinks showed an increasing trend at a rate of 0:08 ± 0:02 PgC yr-2 during 2001-2014, while the pentad land sinks showed an increasing trend at a rate of 0:23±0:04 PgC yr-2 for 2001-2009 and a decreasing trend at a rate of-0:22 ± 0:04 PgC yr-2 during 2009-2014. Although there is good agreement in the trends of the pentad sinks between this study and that of GCP, the increasing rate of the pentad ocean sinks of this study was about 2 times larger than that of GCP. © 2019 Author(s).
语种	英语
scopus关键词	atmospheric chemistry; carbon budget; carbon dioxide; nitrogen; oxygen; sampling; time series analysis; Pacific Ocean; Pacific Ocean (West)
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144268
作者单位	Center for Environmental Measurement and Analysis, National Institute for Environmental Studies, Tsukuba, 305-8506, Japan; Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, 305-8506, Japan
推荐引用方式 GB/T 7714	Tohjima Y.,Mukai H.,MacHida T.,et al. Global carbon budgets estimated from atmospheric O2N2 and CO2 observations in the western Pacific region over a 15-year period[J],2019,19(14).
APA	Tohjima Y.,Mukai H.,MacHida T.,Hoshina Y.,&Nakaoka S.-I..(2019).Global carbon budgets estimated from atmospheric O2N2 and CO2 observations in the western Pacific region over a 15-year period.Atmospheric Chemistry and Physics,19(14).
MLA	Tohjima Y.,et al."Global carbon budgets estimated from atmospheric O2N2 and CO2 observations in the western Pacific region over a 15-year period".Atmospheric Chemistry and Physics 19.14(2019).