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arXiv 2211.13612stat.APstat.ME
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通过条件方法对风速和风向进行联合建模

Joint modeling of wind speed and wind direction through a conditional approach

Eva Murphy, Whitney Huang, Julie Bessac, Jiali Wang, Rao Kotamarthi

AI总结:

针对风速和风向联合概率分布估计问题,提出将联合分布分解为风向边际分布与风速条件分布乘积的条件方法,通过von Mises混合模型和方向依赖Weibull分布建模,在估计效率上优于替代方法,并可用于研究未来气候情景下的联合分布变化。

摘要:

大气近地表风速和风向在空气质量建模、建筑设计、风力涡轮机布置到气候变化研究等诸多应用中发挥着重要作用。因此,准确估计风速和风向的联合概率分布至关重要。在这项工作中,我们开发了一种条件方法来对这两个变量进行建模,其中联合分布被分解为风向的边际分布与给定风向时风速的条件分布的乘积。为了适应风向的循环特性,我们使用了von Mises混合模型;条件风速分布通过两阶段估计程序建模为方向依赖的Weibull分布,该程序包括方向分箱Weibull参数估计,随后通过谐波回归估计Weibull参数对风向的依赖性。蒙特卡罗模拟研究表明,在估计效率方面,我们的方法优于使用周期性样条分位数回归的替代方法。我们通过使用区域气候模型的输出来说明我们的方法,以研究在未来一些气候情景下风速和风向的联合分布可能如何变化。

英文摘要:

Atmospheric near surface wind speed and wind direction play an important role in many applications, ranging from air quality modeling, building design, wind turbine placement to climate change research. It is therefore crucial to accurately estimate the joint probability distribution of wind speed and direction. In this work we develop a conditional approach to model these two variables, where the joint distribution is decomposed into the product of the marginal distribution of wind direction and the conditional distribution of wind speed given wind direction. To accommodate the circular nature of wind direction a von Mises mixture model is used; the conditional wind speed distribution is modeled as a directional dependent Weibull distribution via a two-stage estimation procedure, consisting of a directional binned Weibull parameter estimation, followed by a harmonic regression to estimate the dependence of the Weibull parameters on wind direction. A Monte Carlo simulation study indicates that our method outperforms an alternative method that uses periodic spline quantile regression in terms of estimation efficiency. We illustrate our method by using the output from a regional climate model to investigate how the joint distribution of wind speed and direction may change under some future climate scenarios.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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