Atmospheric CO2 and 14CO2 observations at the northern foot of the Qinling Mountains in China: Temporal characteristics and source quantification

被引：1

作者：

Liu, Wanyu ^{[1
,2
]}

Niu, Zhenchuan ^{[1
,3
,4
,5
]}

Feng, Xue ^{[6
]}

Zhou, Weijian ^{[1
,4
,7
]}

Liang, Dan ^{[6
]}

Lyu, Mengni ^{[6
]}

Wang, Guowei ^{[6
]}

Lu, Xuefeng ^{[1
,7
]}

Liu, Lin ^{[2
]}

Turnbull, Jocelyn C. ^{[8
,9
]}

机构：

[1] Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China

[2] Beijing Normal Univ, Interdisciplinary Res Ctr Earth Sci Frontier, Beijing 100875, Peoples R China

[3] Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China

[4] Pilot Natl Lab Marine Sci & Technol Qingdao, Open Studio Ocean Continental Climate & Environm C, Qingdao 266061, Peoples R China

[5] Natl Observat & Res Stn Reg Ecol Environm Change &, Guangzhou, Peoples R China

[6] Xian Inst Innovat Earth Environm Res, Xian 710061, Peoples R China

[7] Joint Xian AMS Ctr IEECAS & Xian Jiaotong Univ, Shaanxi Prov Key Lab Accelerator Mass Spectrometry, Xian 710061, Peoples R China

[8] GNS Sci, Natl Isotope Ctr, Lower Hutt 5040, New Zealand

[9] Univ Colorado, CIRES, Boulder, CO 80305 USA

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2024年 / 920卷

基金：

中国国家自然科学基金;

关键词：

Atmospheric carbon dioxide; Radiocarbon; Temporal characteristics; Fossil fuel CO2; Biological CO2; The Qinling mountains; FOSSIL-FUEL CO2; LAND CARBON SINK; DIOXIDE; CH4; C-14; DELTA-C-14; EMISSIONS; TRANSPORT; ISOTOPES; STATIONS;

D O I：

10.1016/j.scitotenv.2024.170682

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A two-year (March 2021 to February 2023) continuous atmospheric CO2 and a one-year regular atmospheric (CO2)-C-14 measurement records were measured at the northern foot of the Qinling Mountains in Xi'an, China, aiming to study the temporal characteristics of atmospheric CO2 and the contributions from the sources of fossil fuel CO2 (CO2ff) and biological CO2 (CO2bio) fluxes. The two-year mean CO2 mole fraction was 442.2 +/- 16.3 ppm, with a yearly increase of 4.7 ppm (i.e., 1.1 %) during the two-year observations. Seasonal CO2 mole fractions were the highest in winter (452.1 +/- 17.7 ppm) and the lowest in summer (433.5 +/- 13.3 ppm), with the monthly CO2 levels peaking in January and troughing in June. Diurnal CO2 levels peaked at dawn (05:00-07:00) in spring, summer and autumn, and at 10:00 in winter. C-14 analysis revealed that the excess CO2 (CO2ex, atmospheric CO2 minus background CO2) at this site was mainly from CO2ff emissions (67.0 +/- 26.8 %), and CO2ff mole fractions were the highest in winter (20.6 +/- 17.7 ppm). Local CO enhancement above the background mole fraction (Delta CO) was significantly (r = 0.74, p < 0.05) positively correlated with CO2ff in a one-year measurement, and Delta CO:CO2ff showed a ratio of 23 +/- 6 ppb/ppm during summer and winter sampling days, much lower than previous measurements and suggesting an improvement in combustion efficiency over the last decade. CO2bio mole fractions also peaked in winter (14.2 +/- 9.6 ppm), apparently due to biomass combustion and the lower and more stable wintertime atmospheric boundary layer. The negative CO2bio values in summer indicated that terrestrial vegetation of the Qinling Mountains had the potential to uptake atmospheric CO2 during the corresponding sampling days. This site is most sensitive to local emissions from Xi'an and to short distance transportation from the southern Qinling Mountains through the valleys.

引用

页数：12

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