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Journal Article

Increased frequency of torrential rainstorms during a regional late Holocene eastern Mediterranean drought

Authors
/persons/resource/marieke

Ahlborn,  Marieke
5.2 Climate Dynamics and Landscape Evolution, 5.0 Geoarchives, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Armon,  Moshe
External Organizations;

Ben Dor,  Yoav
External Organizations;

Neugebauer,  Ina
External Organizations;

/persons/resource/mschwab

Schwab,  M. J.
5.2 Climate Dynamics and Landscape Evolution, 5.0 Geoarchives, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/tjalling

Tjallingii,  Rik
5.2 Climate Dynamics and Landscape Evolution, 5.0 Geoarchives, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Shoqeir,  Jawad Hasan
External Organizations;

Morin,  Efrat
External Organizations;

Enzel,  Yehouda
External Organizations;

/persons/resource/brau

Brauer,  A.
5.2 Climate Dynamics and Landscape Evolution, 5.0 Geoarchives, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Ahlborn, M., Armon, M., Ben Dor, Y., Neugebauer, I., Schwab, M. J., Tjallingii, R., Shoqeir, J. H., Morin, E., Enzel, Y., Brauer, A. (2018): Increased frequency of torrential rainstorms during a regional late Holocene eastern Mediterranean drought. - Quaternary Research, 89, 2, 425-431.
https://doi.org/10.1017/qua.2018.9


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_3131910
Abstract
Identifying climates favoring extreme weather phenomena is a primary aim of paleoclimate and paleohydrological research. Here, we present a well-dated, late Holocene Dead Sea sediment record of debris flows covering 3.3 to 1.9 cal ka BP. Twenty-three graded layers deposited in shallow waters near the western Dead Sea shore were identified by microfacies analysis. These layers represent distal subaquatic deposits of debris flows triggered by torrential rainstorms over the adjacent western Dead Sea escarpment. Modern debris flows on this escarpment are induced by rare rainstorms with intensities exceeding >30 mm h−1 for at least one hour and originate primarily from the Active Red Sea Trough synoptic pattern. The observed late Holocene clustering of such debris flows during a regional drought indicates an increased influence of Active Red Sea Troughs resulting from a shift in synoptic atmospheric circulation patterns. This shift likely decreased the passages of eastern Mediterranean cyclones, leading to drier conditions, but favored rainstorms triggered by the Active Red Sea Trough. This is in accord with present-day meteorological data showing an increased frequency of torrential rainstorms in regions of drier climate. Hence, this study provides conclusive evidence for a shift in synoptic atmospheric circulation patterns during a late Holocene drought.