Preprints
https://doi.org/10.5194/egusphere-2022-530
https://doi.org/10.5194/egusphere-2022-530
29 Jun 2022
 | 29 Jun 2022

Spatio-temporal synchronization of heavy rainfall events triggered by atmospheric rivers in North America

Sara M. Vallejo-Bernal, Frederik Wolf, Niklas Boers, Dominik Traxl, Norbert Marwan, and Jürgen Kurths

Abstract. Atmospheric rivers (ARs) are filaments of extensive water vapor transport in the lower troposphere, that play a crucial role in the distribution of water, but can also cause natural and economical damage by facilitating heavy rainfall. Here, we investigate the large-scale spatio-temporal synchronization patterns of heavy rainfall over the western coast and the continental regions of North America (NA), during the period from 1979 to 2018. In particular, we utilize event synchronization and a complex network approach incorporating varying delays to examine the temporal evolution of spatial patterns of heavy rainfall events in the aftermath of land-falling ARs. For that, we employ the SIO-R1 catalog of ARs that land-fall over the western coast of NA, categorized in terms of strength and persistence on an AR-intensity scale which varies from category 1 to 5, along with daily rainfall estimates from the ERA5 reanalysis with 0.25° spatial resolution. Our analysis reveals a cascade of synchronized heavy rainfall events, triggered by ARs of category 3 or higher: in the first 3 days after the first day of an AR strike, rainfall events mostly occur and synchronize along the western coast of NA. In the subsequent days, moisture can be transported to central and eastern Canada and cause synchronized but delayed heavy rainfall there. Furthermore, we assess the robustness of our findings by studying an additional AR detection method. Finally, analyzing the anomalies of integrated water vapor transport, geopotential height, upper-level meridional wind, and rainfall, we find atmospheric circulation patterns that are consistent with the spatio-temporal evolution of the synchronized heavy rainfall events. Understanding and revealing the effects of ARs in the rainfall patterns over NA will lead to better anticipating the evolution of the climate dynamics of the region in the context of a changing climate.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
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Journal article(s) based on this preprint

19 Jul 2023
The role of atmospheric rivers in the distribution of heavy precipitation events over North America
Sara M. Vallejo-Bernal, Frederik Wolf, Niklas Boers, Dominik Traxl, Norbert Marwan, and Jürgen Kurths
Hydrol. Earth Syst. Sci., 27, 2645–2660, https://doi.org/10.5194/hess-27-2645-2023,https://doi.org/10.5194/hess-27-2645-2023, 2023
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

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Employing event synchronization and complex networks analysis, we reveal a cascade of heavy...
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