Abstract
This paper provides an overview of the impacts of the original works of Professor Duzheng YE on a selected set of observational and model studies with which the present author has been associated over the past several decades. The main themes of these works include atmospheric energy dispersion, air–land interactions over the Tibetan Plateau, and El Ni˜norelated air–sea coupling over East Asia.
The dispersive behavior of observed atmospheric fluctuations accompanying cold surge events in East Asia is demonstrated. Cold air outbreaks over Korea and southern China are coincident with the successive downstream development of troughs and ridges, with the group velocity of such wave packets being notably faster than the phase propagation speed of individual troughs and ridges. In a more general context, dispersive features are also discernible from lagged teleconnection charts and cross-spectra of observed and model-simulated geopotential height variations on 10–30-day time scales.
Using the output from a high-resolution general circulation model, the relative contributions of condensational, sensible, and radiative heating to the atmospheric energy budget over the Tibetan Plateau are documented. The rapid changes of the upper tropospheric Tibetan anticyclone and East Asian mei-yu (“plum rain”) precipitation band associated with the development of the Asian monsoon system are described.
The principal anomalies in sea level pressure, surface wind, precipitation and sea surface temperature over southeastern China and the Philippine Sea region during El Ni˜no events are presented. The contributions of remote El Ni˜no-related forcing and local air–sea interaction to the occurrence of these anomalies are assessed.
摘要
这篇文章回顾了叶笃正教授的开创性工作对过去几十年作者所做的一系列观测和模式研究的影响. 这些工作的主要内容包括大气能量频散, 青藏高原陆气相互作用和东亚地区与厄尔尼诺相关的海气耦合过程.
本文阐述了观测中与东亚寒潮事件相伴随的大气扰动的频散过程. 韩国和中国华南地区的寒潮爆发与下游地区槽脊的持续发展同时发生. 这是因为波包的群速度明显快于单个槽脊的位相传播速度. 在更广泛的研究内容中, 滞后遥相关和交叉谱表明10-30天尺度上观测和模式模拟的位势高度变率也体现出频散特征.
利用一个高分辨率大气环流模式的数据, 本文计算了青藏高原大气能量收支中凝结潜热, 感热和辐射加热的相对贡献; 描述了与亚洲季风系统发展相关的对流层上层青藏高原反气旋和东亚梅雨降水带的快速变化过程.
本文还指出在厄尔尼诺事件发生期间中国东南部和菲律宾海地区海平面气压, 地表风场, 降水和海表温度出现明显的异常; 评估了厄尔尼诺遥强迫和局地海气相互作用对这些异常发生的相对贡献.
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Acknowledgements
I thank my former colleagues at GFDL for their support and encouragement in carrying out the diagnostic and modeling studies described in this review. The manuscript was prepared with the assistance of Ms. Connie WONG. My appointment at the Chinese University of Hong Kong was partially supported by the AXA Research Fund. Research support was also provided by the Chinese University of Hong Kong through grants 4720195, 4930075 and 4930744.
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Lau, NC. The pioneering works of Professor Duzheng Ye on atmospheric dispersion, Tibetan Plateau meteorology, and air–sea interaction. Adv. Atmos. Sci. 34, 1137–1149 (2017). https://doi.org/10.1007/s00376-017-6256-6
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DOI: https://doi.org/10.1007/s00376-017-6256-6