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1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Earth and Space Sciences · 术语表

什么是 Carbon isotope excursion？

Definition 14.12 University Earth and Space Sciences — Year 3 · 第 14 章 — Stable-Isotope Geochemistry

A carbon isotope excursion is a geologically brief shift of the $\delta^{13}\mathrm C$ of carbonates and organic matter worldwide, followed by a return, recorded in sedimentary sections.

(a) The 13 C of buried carbonate at steady state against the organic carbon burial fraction: carbonates near 0 mean f_ org near 0.2. (b) The carbon needed for an excursion of 2.5 or 4.0\, ‰ in an exchangeable reservoir of 50\,000\, Gt at 0, against the composition of the source. — (a) The $\delta^{13}\mathrm C$ of buried carbonate at steady state against the organic carbon burial fraction: carbonates near 0 mean $f_{\mathrm{org}}$ near 0.2. (b) The carbon needed for an excursion of 2.5 or $4.0\,\text{‰}$ in an exchangeable reservoir of $50\,000\,\mathrm{Gt}$ at 0, against the composition of the source.

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