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Tree-ring Δ14C time series from 1948 to 2018 at a regional background site, China: Influences of atmospheric nuclear weapons tests and fossil fuel emissions
https://orcid.org/0000-0001-9872-0257
https://orcid.org/0000-0001-9319-3902
https://orcid.org/0000-0001-7763-8115
https://orcid.org/0000-0003-2964-6553
Abstract Δ14C values were measured from tree-rings (1948–2018) of Pinus tabuliformis Carr. that grew at the Shangdianzi (SDZ) regional background site in China. The objectives of this study are to establish a record of atmospheric Δ14C, and to evaluate the influences of Chinese atmospheric nuclear tests and fossil carbon emissions on atmospheric Δ14C variations. The SDZ tree-ring Δ14C values are negative before 1956, and increase dramatically in response to global atmospheric nuclear tests, with a peak value of 844.0 ± 4.2‰ in 1964. After the Partial Test Ban Treaty in 1963, the Δ14C values at SDZ decrease exponentially during 1964–2018. The half-life of the Δ14C decrease was protracted by approximately 2.7 yr during 1964–1984, due to Chinese atmospheric nuclear tests as well as Chinese forests as a carbon source during that period. Massive fossil carbon emissions in China lead to the SDZ decrease rate that is about 1.8‰ yr−1 faster than that for the Northern Hemisphere background region during 2000–2010. SDZ Δ14C since 2000 show strong negative correlations with fossil carbon emissions from the Beijing-Tianjin-Hebei (BTH) region (r 2 = 0.954) and China (r 2 = 0.950), and a 1‰ decrease in SDZ Δ14C indicates an increase of 2.3 ± 0.2 Mt C and 23.3 ± 1.7 Mt C fossil carbon emissions from the BTH region and China, respectively.
Graphical abstract Display Omitted
Highlights Tree ring (1948–2018) Δ14C values were measured at a Chinese background site. Tree ring Δ14C value at Shangdianzi (SDZ) shows a peak of 844.0 ± 4.2‰ in 1964. Chinese bomb test is a main factor extending 2.7 yr half-life of SDZ Δ14C decrease. Fossil carbon emissions in China since 2000 accelerated SDZ Δ14C decrease rate. Tree ring Δ14C at SDZ are anti-correlated with fossil carbon emissions after 2000.
Tree-ring Δ14C time series from 1948 to 2018 at a regional background site, China: Influences of atmospheric nuclear weapons tests and fossil fuel emissions
https://orcid.org/0000-0001-9872-0257
https://orcid.org/0000-0001-9319-3902
https://orcid.org/0000-0001-7763-8115
https://orcid.org/0000-0003-2964-6553
Abstract Δ14C values were measured from tree-rings (1948–2018) of Pinus tabuliformis Carr. that grew at the Shangdianzi (SDZ) regional background site in China. The objectives of this study are to establish a record of atmospheric Δ14C, and to evaluate the influences of Chinese atmospheric nuclear tests and fossil carbon emissions on atmospheric Δ14C variations. The SDZ tree-ring Δ14C values are negative before 1956, and increase dramatically in response to global atmospheric nuclear tests, with a peak value of 844.0 ± 4.2‰ in 1964. After the Partial Test Ban Treaty in 1963, the Δ14C values at SDZ decrease exponentially during 1964–2018. The half-life of the Δ14C decrease was protracted by approximately 2.7 yr during 1964–1984, due to Chinese atmospheric nuclear tests as well as Chinese forests as a carbon source during that period. Massive fossil carbon emissions in China lead to the SDZ decrease rate that is about 1.8‰ yr−1 faster than that for the Northern Hemisphere background region during 2000–2010. SDZ Δ14C since 2000 show strong negative correlations with fossil carbon emissions from the Beijing-Tianjin-Hebei (BTH) region (r 2 = 0.954) and China (r 2 = 0.950), and a 1‰ decrease in SDZ Δ14C indicates an increase of 2.3 ± 0.2 Mt C and 23.3 ± 1.7 Mt C fossil carbon emissions from the BTH region and China, respectively.
Graphical abstract Display Omitted
Highlights Tree ring (1948–2018) Δ14C values were measured at a Chinese background site. Tree ring Δ14C value at Shangdianzi (SDZ) shows a peak of 844.0 ± 4.2‰ in 1964. Chinese bomb test is a main factor extending 2.7 yr half-life of SDZ Δ14C decrease. Fossil carbon emissions in China since 2000 accelerated SDZ Δ14C decrease rate. Tree ring Δ14C at SDZ are anti-correlated with fossil carbon emissions after 2000.
Tree-ring Δ14C time series from 1948 to 2018 at a regional background site, China: Influences of atmospheric nuclear weapons tests and fossil fuel emissions
https://orcid.org/0000-0001-9872-0257
https://orcid.org/0000-0001-9319-3902
https://orcid.org/0000-0001-7763-8115
https://orcid.org/0000-0003-2964-6553
Abstract Δ14C values were measured from tree-rings (1948–2018) of Pinus tabuliformis Carr. that grew at the Shangdianzi (SDZ) regional background site in China. The objectives of this study are to establish a record of atmospheric Δ14C, and to evaluate the influences of Chinese atmospheric nuclear tests and fossil carbon emissions on atmospheric Δ14C variations. The SDZ tree-ring Δ14C values are negative before 1956, and increase dramatically in response to global atmospheric nuclear tests, with a peak value of 844.0 ± 4.2‰ in 1964. After the Partial Test Ban Treaty in 1963, the Δ14C values at SDZ decrease exponentially during 1964–2018. The half-life of the Δ14C decrease was protracted by approximately 2.7 yr during 1964–1984, due to Chinese atmospheric nuclear tests as well as Chinese forests as a carbon source during that period. Massive fossil carbon emissions in China lead to the SDZ decrease rate that is about 1.8‰ yr−1 faster than that for the Northern Hemisphere background region during 2000–2010. SDZ Δ14C since 2000 show strong negative correlations with fossil carbon emissions from the Beijing-Tianjin-Hebei (BTH) region (r 2 = 0.954) and China (r 2 = 0.950), and a 1‰ decrease in SDZ Δ14C indicates an increase of 2.3 ± 0.2 Mt C and 23.3 ± 1.7 Mt C fossil carbon emissions from the BTH region and China, respectively.
Graphical abstract Display Omitted
Highlights Tree ring (1948–2018) Δ14C values were measured at a Chinese background site. Tree ring Δ14C value at Shangdianzi (SDZ) shows a peak of 844.0 ± 4.2‰ in 1964. Chinese bomb test is a main factor extending 2.7 yr half-life of SDZ Δ14C decrease. Fossil carbon emissions in China since 2000 accelerated SDZ Δ14C decrease rate. Tree ring Δ14C at SDZ are anti-correlated with fossil carbon emissions after 2000.
Tree-ring Δ14C time series from 1948 to 2018 at a regional background site, China: Influences of atmospheric nuclear weapons tests and fossil fuel emissions
Niu, Zhenchuan (author) / Feng, Xue (author) / Zhou, Weijian (author) / Wang, Peng (author) / Liu, Yu (author) / Lu, Xuefeng (author) / Du, Hua (author) / Fu, Yunchong (author) / Li, Ming (author) / Mei, Ruochen (author)
Atmospheric Environment ; 246
2020-12-15
Article (Journal)
Electronic Resource
English
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