C D Shen
Biographic Data
| ID | 5598308 |
|---|---|
| NAME | C D Shen |
| GIVEN NAMES | C D |
| FAMILY NAME | Shen |
| SIGNATURE | SHEN C D |
| VERIFIED | No |
| TOTAL WORKS | 9 |
| TOTAL CITATIONS | 6 |
| WORKS AS AUTHOR | 9 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 2004 |
| LATEST PUBLICATION YEAR | 2017 |
| H-INDEX | 2 |
Small-mass graphite preparation for AMS 14 C measurements performed at Gigcas, China
The sealed tube Zn reduction method has been applied for small-mass samples ranging from 15 to 100 μg carbon preparation for accelerator mass spectrometry (AMS) radiocarbon ( 14 C) measurements at the AMS- 14 C Preparation Lab in Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS). The volume of the sealed reactor tube is reduced to ~0.75 cm 3 in order to increase the yield of graphite. Graphite targets are measured at the K…
Fossil-Fuel-Derived CO 2 Contribution to the Urban Atmosphere in Guangzhou, South China, Estimated by 14 CO 2 Observation, 2010–2011
From October 2010 to November 2011, the urban atmospheric CO 2 concentration in Guangzhou ranged from 550 to 460 ppm, with mean monthly concentration fluctuating between 530 and 470 ppm. A lower concentration was observed in summer and autumn, while a higher concentration occurred in spring and winter. The urban atmospheric CO 2 δ 13 C value varied between −9.00 and −13.10%, with mean monthly value fluctuating between −9.60 and −11.80%. There was…
C and 10Be in Dust Deposited During the Storm of 16–17 April 2006 in Beijing
The concentrations of 10Be and 14C and values of δ13C in samples collected during a major dust storm in Beijing on 16–17 April 2006 were studied. The 10Be concentrations ranged from 1.69 × 108 to 2.07 × 108 atom/g, 14C ages for black carbon (BC) ranged from 3001 to 5181 yr BP and for total inorganic carbon (TIC) from 8464 to 9119 yr BP, and δ13C values for BC ranged from -23.15% to -23.80% and for TIC from -5.39% to -5.98%. A comparison of BC con…
C and 10 Be in Dust Deposited During the Storm of 16–17 April 2006 in Beijing
The concentrations of 10 Be and 14 C and values of δ 13 C in samples collected during a major dust storm in Beijing on 16–17 April 2006 were studied. The 10 Be concentrations ranged from 1.69 × 10 8 to 2.07 × 10 8 atom/g, 14 C ages for black carbon (BC) ranged from 3001 to 5181 yr BP and for total inorganic carbon (TIC) from 8464 to 9119 yr BP, and δ 13 C values for BC ranged from -23.15% to -23.80% and for TIC from -5.39% to -5.98%. A comparison…
Quantification of Sedimentary Organic Carbon Storage and Turnover of Tidal Mangrove Stands in Southern China Based on Carbon Isotopic Measurements
Mangrove ecosystems are highly productive and play an important role in tropical and global coastal carbon (C) budgets. However, sedimentary organic carbon (SOC) storage and turnover in mangrove forests are still poorly understood. Based on C isotopic measurements of sediment cores of 2 mangrove stands in southern China, SOC density was 431.77 Mg ha −1 at site 1 (a Aegiceras corniculatum -dominated high tidal stand) and 243.65 Mg ha −1 in site 2 …
Buried Ancient Forest and Implications for Paleoclimate Since the Mid-Holocene in South China
The historical evolution of an ancient forest that developed at Gaoyao, south China, can be divided into 4 stages of radiocarbon intervals (1.1–1.5, 2.0–3.5, 3.6–4.0, and 4.3–4.9 ka) in which the last 3 stages all developed in a wetland and formed humic layers of 2.0, 0.5, and 0.7 m depth, respectively. The humic layers were interrupted by 2 white-gray silty clay layers that most likely formed during climate fluctuations. Four drought events were…
Improved Application of Bomb Carbon in Teeth for Forensic Investigation
While radiocarbon is widely applied in dating ancient samples, recent studies reveal that 14 C concentrations in modern samples can also yield precise ages due to the atmospheric testing of thermonuclear devices between 1950 and 1963. 14 C concentrations in both enamel and organic matter of 13 teeth from 2 areas in China were examined to evaluate and improve this method of forensic investigation. Choosing enamel near the cervix of the tooth can r…
Turnover Rate of Soil Organic Matter and Origin of Soil 14 Co 2 in Deep Soil from a Subtropical Forest in Dinghushan Biosphere Reserve, South China
This paper examines the carbon isotopes ( 13 C, 14 C) of soil organic carbon (SOC) and soil CO 2 from an evergreen broadleaf forest in southern China during the rainy season. The distribution of SOC δ 13 C, and SOC content with depth, exhibits a regular decomposition of SOC compartments with different turnover rates. Labile carbon is the main component in the topsoil (0–12 cm) and has a turnover rate between 0.1 and 0.01 yr –1 . In the middle sec…
Interannual 14 C Variations During 1977–1998 Recorded in Coral from Daya Bay, South China Sea
Twenty-two annually banded samples of coral from 1977 to 1998 were collected from Daya Bay, South China Sea, and bomb 14 C concentrations were determined. The interannual variation of coral Δ 14 C is controlled mainly by oceanic factors. In ENSO years, the coastwise upwelling current of the South China Sea has been intensified; hence, the coral Δ 14 C displays its minimum value. The interannual variation curve of Δ 14 C in coral bears a relations…
Turnover Rate of Soil Organic Matter and Origin of Soil 14 Co 2 in Deep Soil from a Subtropical Forest in Dinghushan Biosphere Reserve, South China
This paper examines the carbon isotopes ( 13 C, 14 C) of soil organic carbon (SOC) and soil CO 2 from an evergreen broadleaf forest in southern China during the rainy season. The distribution of SOC δ 13 C, and SOC content with depth, exhibits a regular decomposition of SOC compartments with different turnover rates. Labile carbon is the main component in the topsoil (0–12 cm) and has a turnover rate between 0.1 and 0.01 yr –1 . In the middle sec…
Interannual 14 C Variations During 1977–1998 Recorded in Coral from Daya Bay, South China Sea
Twenty-two annually banded samples of coral from 1977 to 1998 were collected from Daya Bay, South China Sea, and bomb 14 C concentrations were determined. The interannual variation of coral Δ 14 C is controlled mainly by oceanic factors. In ENSO years, the coastwise upwelling current of the South China Sea has been intensified; hence, the coral Δ 14 C displays its minimum value. The interannual variation curve of Δ 14 C in coral bears a relations…
Improved Application of Bomb Carbon in Teeth for Forensic Investigation
While radiocarbon is widely applied in dating ancient samples, recent studies reveal that 14 C concentrations in modern samples can also yield precise ages due to the atmospheric testing of thermonuclear devices between 1950 and 1963. 14 C concentrations in both enamel and organic matter of 13 teeth from 2 areas in China were examined to evaluate and improve this method of forensic investigation. Choosing enamel near the cervix of the tooth can r…
Interannual 14 C Variations During 1977–1998 Recorded in Coral from Daya Bay, South China Sea
Twenty-two annually banded samples of coral from 1977 to 1998 were collected from Daya Bay, South China Sea, and bomb 14 C concentrations were determined. The interannual variation of coral Δ 14 C is controlled mainly by oceanic factors. In ENSO years, the coastwise upwelling current of the South China Sea has been intensified; hence, the coral Δ 14 C displays its minimum value. The interannual variation curve of Δ 14 C in coral bears a relations…
Buried Ancient Forest and Implications for Paleoclimate Since the Mid-Holocene in South China
The historical evolution of an ancient forest that developed at Gaoyao, south China, can be divided into 4 stages of radiocarbon intervals (1.1–1.5, 2.0–3.5, 3.6–4.0, and 4.3–4.9 ka) in which the last 3 stages all developed in a wetland and formed humic layers of 2.0, 0.5, and 0.7 m depth, respectively. The humic layers were interrupted by 2 white-gray silty clay layers that most likely formed during climate fluctuations. Four drought events were…
Improved Application of Bomb Carbon in Teeth for Forensic Investigation
While radiocarbon is widely applied in dating ancient samples, recent studies reveal that 14 C concentrations in modern samples can also yield precise ages due to the atmospheric testing of thermonuclear devices between 1950 and 1963. 14 C concentrations in both enamel and organic matter of 13 teeth from 2 areas in China were examined to evaluate and improve this method of forensic investigation. Choosing enamel near the cervix of the tooth can r…
Turnover Rate of Soil Organic Matter and Origin of Soil 14 Co 2 in Deep Soil from a Subtropical Forest in Dinghushan Biosphere Reserve, South China
This paper examines the carbon isotopes ( 13 C, 14 C) of soil organic carbon (SOC) and soil CO 2 from an evergreen broadleaf forest in southern China during the rainy season. The distribution of SOC δ 13 C, and SOC content with depth, exhibits a regular decomposition of SOC compartments with different turnover rates. Labile carbon is the main component in the topsoil (0–12 cm) and has a turnover rate between 0.1 and 0.01 yr –1 . In the middle sec…
Fossil-Fuel-Derived CO 2 Contribution to the Urban Atmosphere in Guangzhou, South China, Estimated by 14 CO 2 Observation, 2010–2011
From October 2010 to November 2011, the urban atmospheric CO 2 concentration in Guangzhou ranged from 550 to 460 ppm, with mean monthly concentration fluctuating between 530 and 470 ppm. A lower concentration was observed in summer and autumn, while a higher concentration occurred in spring and winter. The urban atmospheric CO 2 δ 13 C value varied between −9.00 and −13.10%, with mean monthly value fluctuating between −9.60 and −11.80%. There was…
C and 10Be in Dust Deposited During the Storm of 16–17 April 2006 in Beijing
The concentrations of 10Be and 14C and values of δ13C in samples collected during a major dust storm in Beijing on 16–17 April 2006 were studied. The 10Be concentrations ranged from 1.69 × 108 to 2.07 × 108 atom/g, 14C ages for black carbon (BC) ranged from 3001 to 5181 yr BP and for total inorganic carbon (TIC) from 8464 to 9119 yr BP, and δ13C values for BC ranged from -23.15% to -23.80% and for TIC from -5.39% to -5.98%. A comparison of BC con…
C and 10 Be in Dust Deposited During the Storm of 16–17 April 2006 in Beijing
The concentrations of 10 Be and 14 C and values of δ 13 C in samples collected during a major dust storm in Beijing on 16–17 April 2006 were studied. The 10 Be concentrations ranged from 1.69 × 10 8 to 2.07 × 10 8 atom/g, 14 C ages for black carbon (BC) ranged from 3001 to 5181 yr BP and for total inorganic carbon (TIC) from 8464 to 9119 yr BP, and δ 13 C values for BC ranged from -23.15% to -23.80% and for TIC from -5.39% to -5.98%. A comparison…
Quantification of Sedimentary Organic Carbon Storage and Turnover of Tidal Mangrove Stands in Southern China Based on Carbon Isotopic Measurements
Mangrove ecosystems are highly productive and play an important role in tropical and global coastal carbon (C) budgets. However, sedimentary organic carbon (SOC) storage and turnover in mangrove forests are still poorly understood. Based on C isotopic measurements of sediment cores of 2 mangrove stands in southern China, SOC density was 431.77 Mg ha −1 at site 1 (a Aegiceras corniculatum -dominated high tidal stand) and 243.65 Mg ha −1 in site 2 …
Small-mass graphite preparation for AMS 14 C measurements performed at Gigcas, China
The sealed tube Zn reduction method has been applied for small-mass samples ranging from 15 to 100 μg carbon preparation for accelerator mass spectrometry (AMS) radiocarbon ( 14 C) measurements at the AMS- 14 C Preparation Lab in Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS). The volume of the sealed reactor tube is reduced to ~0.75 cm 3 in order to increase the yield of graphite. Graphite targets are measured at the K…
Geology (8 works) · Chemistry (7 works) · Environmental Science (7 works) · Environmental Chemistry (6 works) · Geology and Paleoclimatology Research (5 works) · Geography (4 works) · Oceanography (4 works) · Radiocarbon dating (4 works) · Total organic carbon (4 works) · Atmospheric chemistry and aerosols (3 works)