کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8910628 | 1637920 | 2018 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spatial analysis of the atmospheric helium isotopic composition: Geochemical and environmental implications
ترجمه فارسی عنوان
تجزیه و تحلیل فضایی ترکیب ایزوتوپی هلیوم اتم: پیامدهای ژئوشیمیایی و محیطی
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کلمات کلیدی
هلیم، ایزوتوپها، اتمسفر،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
Spatial variations in the atmospheric helium isotopic composition (RA = 3He/4Heairâ¯=â¯1.39â¯Ãâ¯10â6) might be induced by localized and/or regional inputs of 3He and/or 4He into the air. It has been suggested that inputs of 4He from hydrocarbon exploitation may generate latitudinal variations in atmospheric 3He/4He. In order to test the possibility of such global variations, we performed high precision analyses of the helium isotopic composition (3He/4He) of sixteen air samples collected in 500â¯cc metal bottles around the world (79°N-75°S) between 2013 and 2015. In most cases, the 3He/4He of these air samples are indistinguishable from that of air sampled around Nancy (France) within â¤2â° (95% confidence interval). Only two air samples, collected at Dome C (Antarctica) and at Tokyo (Japan), exhibit statistically higher 3He/4He ratios interpreted as potential 3He excesses of (2.0â¯Â±â¯1.4)â° and (1.7â¯Â±â¯1.5)â° (95% confidence interval), respectively. Excesses such as these suggest that potential helium isotopic variations in air are likely lower than 4â° and might be generated temporarily by regional and/or local phenomenon (e.g. auroral precipitation, stratospheric to tropospheric exchanges). Thus, this study supports the use of the atmospheric helium isotopic ratio as an inter-laboratory He standard.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geochimica et Cosmochimica Acta - Volume 237, 15 September 2018, Pages 120-130
Journal: Geochimica et Cosmochimica Acta - Volume 237, 15 September 2018, Pages 120-130
نویسندگان
Christine Boucher, Tefang Lan, Jennifer Mabry, David V. Bekaert, Peter G. Burnard, Bernard Marty,