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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Δ15N ： ウィキペディア英語版 Δ15N In geochemistry, hydrology, paleoclimatology and paleoceanography ''δ''15N (pronounced "delta fifteen n") or delta-N-15 is a measure of the ratio of stable isotopes 15N:14N. ==Formulas== Two very similar expressions for are in wide use in hydrology. Both have the form $1000\backslash fraca$ ‰ (‰ = permil or parts per thousand) where ''s'' and ''a'' are the relative abundances of 15N in respectively the sample and the atmosphere. The difference is whether the relative abundance is with respect to all the nitrogen, i.e. 14N plus 15N, or just to 14N. Since the atmosphere is 99.6337% 14N and 0.3663% 15N, ''a'' is 0.003663 in the former case and 0.003663/0.996337 = 0.003676 in the latter. However ''s'' varies similarly; for example if in the sample 15N is 0.385% and 14N is 99.615%, ''s'' is 0.003850 in the former case and 0.00385/0.99615 = 0.003865 in the latter. The value of $1000\backslash fraca$ is then 51.05‰ in the former case and 51.38‰ in the latter, an insignificant difference in practice given the typical range of -20 to 80 for . 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Δ15N」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.