کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5755355 1621634 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Changes in atmospheric CO2 levels recorded by the isotopic signature of n-alkanes from plants
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Changes in atmospheric CO2 levels recorded by the isotopic signature of n-alkanes from plants
چکیده انگلیسی
The isotopic signature of sedimentary organic matter acts as a tracer for past changes in the terrestrial and aquatic carbon cycles. The temporal variation in δ13C values of n-alkanes from plants was assigned as resulting from changes in atmospheric composition in the study area, due to both global and local influences. Two rises in atmospheric CO2 concentration were assigned from the variation in n-alkane δ13C values for the periods between 1600 and 1880 and from 1930 to the present. In the first period, the sources of excess CO2 were predominantly natural, mainly volcanism, while in the second period local anthropogenic emissions were the major reason.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Global and Planetary Change - Volume 148, January 2017, Pages 72-78
نویسندگان
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