Controls on the Carbon Isotopic Compositions of Lipids in Marine Environments

2006 ◽  
pp. 209-249 ◽  
Author(s):  
Richard D. Pancost ◽  
Mark Pagani
Keyword(s):  
Marine Environments ◽  
Isotopic Compositions ◽  
Carbon Isotopic

scholarly journals Diurnal variations of organic molecular tracers and stable carbon isotopic compositions in atmospheric aerosols over Mt. Tai in North China Plain: an influence of biomass burning

2012 ◽  
Vol 12 (4) ◽  
pp. 9079-9124
Author(s):  
P. Q. Fu ◽  
K. Kawamura ◽  
J. Chen ◽  
J. Li ◽  
Y. L. Sun ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Biomass Burning ◽  
North China Plain ◽  
North China ◽  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Total Carbon ◽  
Stable Carbon ◽  
Isotopic Compositions ◽  
Carbon Isotopic

Abstract. Organic tracer compounds of tropospheric aerosols, as well as organic carbon (OC), elemental carbon (EC), water-soluble organic carbon (WSOC), and stable carbon isotope ratios (δ13C) of total carbon (TC) have been investigated for aerosol samples collected during early and late periods of Mount Tai eXperiment 2006 (MTX2006) field campaign in North China Plain. Total solvent extracts were investigated by gas chromatography/mass spectrometry. More than 130 organic compounds were detected in the aerosol samples. They were grouped into twelve organic compound classes, including biomass burning tracers, biogenic primary sugars, biogenic secondary organic aerosol (SOA) tracers, and anthropogenic tracers such as phthalates, hopanes and polycyclic aromatic hydrocarbons (PAHs). In early June when the field burning activities of wheat straws in North China Plain were very active, the total identified organics (2090 ± 1170 ng m−3) were double those in late June (926 ± 574 ng m−3). All the compound classes were more abundant in early June than in late June, except phthalate esters, which were higher in late June. Levoglucosan (88–1210 ng m−3, 403 ng m−3) was found as the most abundant single compound in early June, while diisobutyl phthalate was the predominant species in late June. During the biomass-burning period in early June, the diurnal trends of most of the primary and secondary organic aerosol tracers were characterized by the concentration peaks observed at mid-night or in early morning, while in late June most of the organic species peaked in late afternoon. This suggests that smoke plumes from biomass burning can uplift the aerosol particulate matter to a certain altitude and then transported to and encountered the summit of Mt. Tai during nighttime. On the basis of the tracer-based method for the estimation of biomass-burning OC, fungal-spore OC and biogenic secondary organic carbon (SOC), we estimate that an average of 24% (up to 64%) of the OC in the Mt. Tai aerosols was due to biomass burning in early June, followed by the contribution of isoprene SOC (mean 4.3%). In contrast, isoprene SOC was the main contributor (6.6%) to OC, and only 3.0% of the OC was due to biomass burning in late June. In early June, δ13C of TC (−26.6‰ to −23.2‰, mean −25.0‰) were lower than those (−23.9‰ to −21.9‰, mean −22.9‰) in late June. In addition, a strong anti-correlation was found between levoglucosan and δ13C values. This study demonstrates that crop-residue burning activities can significantly enhance the organic aerosol loading and alter the organic molecular compositions and stable carbon isotopic compositions of aerosol particles in the troposphere over North China Plain.

Carbon isotopic compositions of individual terpenoids in heavy oils from Karamay oilfield

1999 ◽  
Vol 44 (3) ◽  
pp. 256-259 ◽  
Author(s):  
Yongqiang Xiong ◽  
Ansong Geng ◽  
Deguang Liu
Keyword(s):  
Heavy Oils ◽  
Isotopic Compositions ◽  
Carbon Isotopic

Determination of the stable carbon isotopic compositions of 2-methyltetrols in ambient aerosols from the Changbai Mountains

2010 ◽  
Vol 24 (11) ◽  
pp. 1625-1628 ◽  
Author(s):  
Li Li ◽  
Shihuai Deng ◽  
Wu Wang ◽  
Huaijian Li ◽  
Xiaohong Zhang ◽  
...  
Keyword(s):  
Changbai Mountains ◽  
Stable Carbon ◽  
Ambient Aerosols ◽  
Isotopic Compositions ◽  
Carbon Isotopic

Microscale determination of the spectral characteristics and carbon-isotopic compositions of porphyrins

1993 ◽  
Vol 7 (2) ◽  
pp. 185-190 ◽  
Author(s):  
Brian N. Popp ◽  
J. M. Hayes ◽  
Christopher J. Boreham
Keyword(s):  
Spectral Characteristics ◽  
Isotopic Compositions ◽  
Carbon Isotopic

Helium and carbon isotopic compositions of hot spring gases in the Tibetan Plateau

1999 ◽  
Vol 88 (1-2) ◽  
pp. 99-107 ◽  
Author(s):  
Tetsuya Yokoyama ◽  
Shun'ichi Nakai ◽  
Hiroshi Wakita
Keyword(s):  
Tibetan Plateau ◽  
Hot Spring ◽  
The Tibetan Plateau ◽  
Isotopic Compositions ◽  
Carbon Isotopic
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