Dear Colleagues,

Today, human activities, especially those in urban areas, are transforming the global environment at an unpreceded rate and scale. Urban centers feature high population density, a heavily modified landscape, burgeoning anthropogenic stress, and on top of that, novel challenges of urban environmental issues, the urban heat island being a well-known example. Urban dynamics underlies a complex interplay between humans and nature, the understanding of which requires process-level knowledge augmented by system-level modeling, of which the urban atmosphere is a critical element. This Special Issue of Atmosphere focuses on the flow and transport of energy, water, greenhouse gases, and pollutants in urban canopy layers. We invite you to contribute to this Special Issue with your state-of-the-art research endeavors to further our fundamental understanding of the physics and thermodynamics of flow over complex built terrains, and more importantly, to inform and foster sustainable urban environment management and policy-making processes in the long run. We solicit original research papers, reviews, and perspectives on all topics related to urban atmospheric studies, with an impact on local hydrometeorological changes as well as regional and global environment–health–climate repercussions. Specific topics include but are not limited to observations and numerical simulations of urban flow field, exchange of energy, water, and scalars in the land–atmosphere continuum, and the underlying dynamics of the urban heat island, air pollution, and hydroclimate changes.

Dr. Ting Sun
Dr. Benjamin Crawford
Guest Editors

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• atmospheric transport
• greenhouse gas and air pollution
• heat island and mitigation
• urban canopy layer processes
• urban hydrometeorology
• urban fluid dynamics