zaplotnik/Metrics-of-Hadley-circulation-strength

Hadley cell strength This is a collection of open data sources related to the study of the sensitivity of the trend of Hadley cell (HC) strength to the applied HC strength measure. The applied metrics are described in manuscript: Pikovnik, Zaplotnik, Boljka, Žagar, 2021. Metrics of the Hadley circulation strength and associated circulation trends (under review at EGU Weather and Climate Dynamics). The HC strength is commonly evaluated by metrics derived from the mass-weighted zonal-mean stream function in isobaric coordinates. Other metrics include the velocity potential and the vertical velocity. These metrics of the HC strength are here complemented by a measure of the average HC strength, obtained by averaging the stream function in the latitude-pressure ($\varphi$-$p$) plane, and by the total energy of unbalanced zonal-mean circulation in the normal-mode function decomposition. The two new measures alleviate the vertical and meridional inhomogeneities of the trends in the HC strength. The data is organised into the following folder: <code>HC_strength_timeseries</code> <code>HC_strength_normalized_timeseries</code>: timeseries normalized by the climatological mean value <code>HC_strength_psi_trends</code>: trends of stream-function-based metrics <code>HC_strength_relative_trends</code>: trends of normalized timeseries <code>HC_strength_maxmin_pressure_levels</code>: pressure levels of maximum and minimum values in the annual-mean streamfunction fields <code>animation</code>: animation of the changes of annual-mean, january and july Hadley cell, desribed by the zonal-mean streamfunction in the latitude-pressure plane <code>correlations_AHC</code>: correlation of the average HC strength measure with other streamfunction based measures; for Northern Hadley cell (NHC) and Southern Hadley cell (SHC)哈得莱环流强度数据集 本数据集为与哈得莱环流（Hadley Cell, HC）强度趋势对所采用环流强度度量方法的敏感性研究相关的开源数据集合。本次研究所采用的度量方法详见论文：Pikovnik、Zaplotnik、Boljka、Žagar，2021年的《哈得莱环流强度度量及关联环流趋势》（目前正在《EGU Weather and Climate Dynamics》期刊审稿中）。 HC强度通常通过等压坐标系下质量加权的纬向平均流函数衍生的度量指标进行评估，其他可选度量指标还包括速度势与垂直速度。本数据集补充了两类新型HC强度度量方式：一是在纬度-气压（$varphi$-$p$）平面内对流函数取平均得到的平均HC强度；二是正则模函数分解下非平衡纬向平均环流的总能量。这两类新度量方法可有效缓解HC强度趋势的垂直与经向非均质性问题。 数据集按以下文件夹组织： - `HC_strength_timeseries`：HC强度时序数据 - `HC_strength_normalized_timeseries`：以气候平均值归一化后的HC强度时序数据 - `HC_strength_psi_trends`：基于流函数的度量指标趋势 - `HC_strength_relative_trends`：归一化时序数据的趋势 - `HC_strength_maxmin_pressure_levels`：年平均流函数场极值所在的气压层级 - `animation`：基于纬度-气压平面内纬向平均流函数绘制的年平均、1月及7月哈得莱环流变化动画 - `correlations_AHC`：平均HC强度度量与其他流函数类度量指标的相关性分析结果，涵盖北哈得莱环流（Northern Hadley Cell, NHC）与南哈得莱环流（Southern Hadley Cell, SHC）