非绝热加热对大气局地扰动位能的影响和机理

Impacts and mechanism of diabatic heating on atmospheric perturbation potential energy

本文运用统计相关和奇异值分解方法,系统地考察了非绝热加热对大气局地扰动位能的影响特征和机理问题.分析结果表明,热带地区海表温度异常和扰动位能的耦合相关特征与厄尔尼诺和南方涛动变率的关系密切,扰动位能在热带外地区的耦合模态空间型呈现出与北太平洋—北美大气遥相关型极为相似的分布特征.通过进一步考察大气中视热源与扰动位能的耦合特征,发现在低纬地区仍主要反映了厄尔尼诺和南方涛动的影响机制,在热带外地区,视热源异常的耦合模态则表现出与北半球环状模类似的特点,这表明热带外地区大气的局地能量有效性与热带非绝热加热的遥强迫以及局地性热源加热强迫有着极为密切的联系.

This study systematically examines the impacts and mechanism of diabatic heating on atmospheric perturbed potential energy （PPE） using statistical correlation analysis and singular value decomposition （SVD） analysis methods. Results show that the coupled correlation features between tropical sea surface temperature （SST） anomalies and PPE are intimately associated with the E1 Nifio-Southern Oscillation （ENSO） phenomenon and those between tropical SST anomalies and extratropical PPE are characterized by the Pacific-North America （PNA）-like pattern. Through further examination of the coupled features between atmospheric apparent heat source （Q1） and PPE, it is demonstrated that over the tropical region the impacts and mechanism between them still mainly reflect ENSO variability, whereas over the extratropical region the coupled patterns between them are manifested by the northern-hemispheric annular mode to some extent. This indicates that the atmospheric local energy availability over the extratropics is closely linked with the remote forcing of tropical diabatic heating and the forcing of local heat source.