|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Evaluation of the carbon isotopic effects of NDIR and CRDS analyzers on atmospheric CO2 measurements显示文摘Non-dispersive infrared(NDIR) and cavity ring-down spectroscopy(CRDS) CO_2 analyzers use 12CO_2 isotopologue absorption lines and are insensitive to all or part of other CO_2-related isotopologues. This may produce biases in CO_2 mole fraction measurements of a sample if its carbon isotopic composition deviates from that of the standard gases being used. To evaluate and compare the effects of carbon isotopic composition on NDIR and CRDS CO_2 analyzers, we prepared three test sample air cylinders with varying carbon isotopic abundances and calibrated them against five standard cylinders with ambient carbon isotopic composition using CRDS and NDIR systems. We found that the CO_2 mole fractions of the sample cylinders measured by G1301(CRDS) were in good agreement with those measured by Lo Flo(NDIR). The CO_2 values measured by both instruments were higher than that of a CO_2 isotope measured by G2201i(CRDS) analyzer for a test cylinder with depleted carbon isotopic composition δ^(13)C =-36.828‰, whereas no obvious difference was found for other two test cylinders with δ^(13)C=-8.630‰ and δ^(13)C=-15.380‰, respectively. According to the theoretical and experimental results, we concluded that the total CO_2 mole fractions of samples with depleted isotopic compositions can be corrected on the basis of their 12CO_2 values calibrated by standard gases using Lo Flo and G1301 if the δ^(13)C and δ18O values are known. | XIA LingJun ZHOU LingXi Marcel V.van der SCHOOT Chris W.RELLA LIU LiXin ZHANG Gen WANG HongYang | 2016 | Science China Earth Sciences2016，59，6： | 2 |
| 2 | Aroma extract dilution analysis of a beef falvouring prepared from flavour precursors and enzymatically hydrolysed beef 显示文摘 | Huanlu Song Lingjun Xia | 2008 | Flavour and fragrance journal2008，，23： | 1 |
| 3 | Aroma extract dilution analysis of a beef falvouring prepared from flavour precursors and enzymatically hydrolysed beef显示文摘 | Huanlu Song Lingjun Xia | 2008 | Flavour and fragrance journal2008，，： | 1 |
| 4 | Aroma extract dilution analysis of a beef flavouring prepared from flavour precursors and enzymatically hydrolysed beef显示文摘 | SONG Huanlu XIA Lingjun | 2008 | Flavour and Fragrance Journal2008，23，3： | 1 |
| 5 | Atmospheric sulfur hexafluoride in-situ measurements at the Shangdianzi regional background station in China显示文摘We present in-situ measurements of atmospheric sulfur hexafluoride(SF6)conducted by an automated gas chromatograph–electron capture detector system and a gas chromatography/mass spectrometry system at a regional background site,Shangdianzi,in China,from June 2009 to May 2011,using the System for Observation of Greenhouse gases in Europe and Asia and Advanced Global Atmospheric Gases Experiment(AGAGE)techniques.The mean background and polluted mixing ratios for SF6during the study period were 7.22×10-12(mol/mol,hereinafter)and 8.66×10-12,respectively.The averaged SF6background mixing ratios at Shangdianzi were consistent with those obtained at other AGAGE stations located at similar latitudes(Trinidad Head and Mace Head),but larger than AGAGE stations in the Southern Hemisphere(Cape Grim and Cape Matatula).SF6background mixing ratios increased rapidly during our study period,with a positive growth rate at 0.30×10-12year-1.The peak to peak amplitude of the seasonal cycle for SF6background conditions was 0.07×10-12,while the seasonal fluctuation of polluted conditions was 2.16×10-12.During the study period,peak values of SF6mixing ratios occurred in autumn when local surface horizontal winds originated from W/WSW/SW/SWS/S sectors,while lower levels of SF6mixing ratios appeared as winds originated from N/NNE/NE/ENE/E sectors. | Bo Yao Lingxi Zhou Lingjun Xia Gen Zhang Lifeng Guo Zhao Liu Shuangxi Fang | 2014 | Journal of Environmental Sciences2014，26，12： | 0 |
| 6 | Spatial and Temporal Distributions of Atmospheric CO2 in East China Based on Data from Three Satellites显示文摘East China(23.6°–38.4°N,113.6°–122.9°E)is the largest developed region in China.Based on CO2 products retrieved from the Greenhouse Gases Observing Satellite(GOSAT),the spatial and temporal distributions of CO2 mixing ratios in East China during 2014–17 are discussed,and the retrieved CO2 from AIRS(Atmospheric Infrared Sounder)and OCO-2(Orbiting Carbon Observatory-2),as well as WLG(Waliguan)background station observations,are compared with those of GOSAT.The annual CO2 retrieved from GOSAT in East China ranged from 398.96±0.24 ppm in 2014 to 407.39±0.20 ppm in 2017,with a growth rate of 2.82±0.15 ppm yr^−1,which were higher than in other regions of China.The seasonal cycle presented a maximum in spring and a minimum in summer or autumn.Higher values were mainly concentrated in the coastal areas of Zhejiang Province,and lower values were concentrated in Jiangxi and the north of Fujian Province.CO2 observed in Fujian and parts of Jiangxi increased by less than 1.0 ppm during 2014–15,but enhanced significantly by more than 5.0 ppm during 2015–16,perhaps influenced by local emissions and global impacts.We calculated year-to-year CO2 enhancements in the Yangtze River Delta region during 2014–17 that were relatively low and stable,due to the region’s carbon emissions control and reduction policies.The annual and seasonal amplitudes of CO2 retrieved from AIRS were lower than those from GOSAT in East China,probably owing to the CO2 retrieved from AIRS better reflecting the characteristics of the mid-troposphere,while GOSAT is more representative of near-surface CO2.The spatial and temporal distribution characteristics of CO2 retrieved from OCO-2 were close to those from GOSAT in East China. | Bozhen LI Gen ZHANG Lingjun XIA Ping KONG Mingjin ZHAN Rui SU | 2020 | Advances in Atmospheric Sciences2020，37，12： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员