Abstract
Capping inversions act as barriers to the vertical diffusion of pollutants, occasionally leading to significant low-level air pollution episodes in the lower troposphere. Here, we conducted two summer campaigns where global positioning system radiosondes were operated in Haifa Bay on the eastern Mediterranean coast, a region of steep terrain with significant pollution. The campaigns provided unique high resolution measurements related to capping inversions. It was found that the classical definition of a capping inversion was insufficient for an explicit identification of a layer; hence additional criteria are required for a complete spatial analysis of inversion evolution. Based on the vertical temperature derivative, an inner fine structure of inversion layers was explored, and was then used to track inversion layers spatially and to investigate their evolution. The exploration of the inner structure of inversion layers revealed five major patterns: symmetric peak, asymmetric peak, double peak, flat peak, and the zig-zag pattern. We found that the symmetric peak is related to the strongest inversions, double peak inversions tended to break apart into two layers, and the zig-zag pattern was related to the weakest inversions. Employing this classification is suggested for assistance in following the evolution of inversion layers.
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Acknowledgments
The authors would like to thank those who contributed to this study by sharing facilities, data, time, goodwill and advice: Haifa Towns Association for the Environment Protection, Israel Electric Corporation (in Haifa and Tel-Aviv), Kishon River Authority (Haifa), Ministry of the Environment Protection (Air Monitoring division, Tel-Aviv), Sea-Gal Yacht Club (Hertzlia), and special thanks to Jakob Kutsher for his help. We thank Roland Stull for his very helpful comments on the draft, and the anonymous reviewers for their important remarks. This work was supported by the IAEC-Pazi Foundation.
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Haikin, N., Galanti, E., Reisin, T.G. et al. Inner Structure of Atmospheric Inversion Layers over Haifa Bay in the Eastern Mediterranean. Boundary-Layer Meteorol 156, 471–487 (2015). https://doi.org/10.1007/s10546-015-0038-4
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DOI: https://doi.org/10.1007/s10546-015-0038-4