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1 Primary & Middle School Mathematics1–9 年级在线 2 High School Mathematics10–12 年级在线 3 University Mathematics — Year 1本科一年级在线 4 University Mathematics — Year 2本科二年级在线 5 University Mathematics — Year 3本科三年级在线

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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 Zonal mean and eddies？

又称： zonal mean · eddy (atmospheric)

Definition 20.11 University Earth and Space Sciences — Year 3 · 第 20 章 — Atmospheric Dynamics

The zonal mean of a quantity $A$ is its average round a latitude circle at fixed height or pressure, $[A] = (1/2\pi)\int_0^{2\pi} A\,\mathrm d\lambda$ . The departure $A^* = A - [A]$ is its eddy part; an eddy of the atmosphere is any departure of the flow from its zonal mean: travelling waves, stationary waves, cyclones and anticyclones.

A growing baroclinic wave in plan view (schematic, Northern Hemisphere, westerly flow). The isotherm (dashed) lags the streamline by a quarter wavelength or less, so the air moving north (red arrows) is warmer than the air moving south at the same latitude (blue): the wave carries heat poleward, [v*T*] > 0. — A growing baroclinic wave in plan view (schematic, Northern Hemisphere, westerly flow). The isotherm (dashed) lags the streamline by a quarter wavelength or less, so the air moving north (red arrows) is warmer than the air moving south at the same latitude (blue): the wave carries heat poleward, $[v^*T^*] > 0$ .

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