Transition from arid to hyper-arid environment in the southern Levant deserts as recorded by early Pleistocene cummulic Aridisols

Amit, Rivka; Simhai, Ori; Ayalon, Avner; Enzel, Yehouda; Matmon, Ari; Crouvi, Onn; Porat, Naomi; McDonald, Eric V.

doi:10.1016/j.quascirev.2010.11.007

Cited by 43 publications

(22 citation statements)

References 68 publications

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“…PC can accumulate in soils in a wide range of temperatures from very hot conditions in hot deserts (Amit et al, 2011;Thomas, 2011) to cold climatic zones such as tundra (Courty et al, 1994;Pustovoytov, 1998). Increasing temperature decreases CO 2 solubility (Krauskopf and Bird, 1994), which directly affects the supersaturation of soil solution with CaCO 3 (Barker and Cox, 2011).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Pedogenic carbonates: Forms and formation processes

Zamanian

Pustovoytov

Kuzyakov

2016

Earth-Science Reviews

389

234

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Section: Accepted Manuscriptmentioning

confidence: 99%

Pedogenic carbonates: Forms and formation processes

Zamanian

Pustovoytov

Kuzyakov

2016

Earth-Science Reviews

389

234

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“…In contrast to the assumptions of Bull and Schick in the 1970s, extensive research in the past 30 yr concerning the Aridisols of the Negev (Gerson et al, 1985;Amit and Gerson, 1986;Gerson and Amit, 1987;Amit and Yaalon, 1996;Amit et al, 1993Amit et al, , 1995Amit et al, , 2006Amit et al, , 2011 indicates that no Bk-soil horizons were formed in fl at alluvial surfaces of this region since at least the middle Pleistocene (Amit et al, 2006) or even since the earliest Pleistocene (Amit et al, 2011). The Cca/Bca/Bk horizons reported earlier from stable alluvial surfaces are actually (1) By/Bmy soil horizons, i.e., gypsic-B horizons rather than calcic horizons ( Fig.…”

Section: Calcic Versus Gypsic-salic Soil Horizons In Stable Alluvial mentioning

confidence: 99%

“…Specifi cally, recent studies of soils and sediment in the southern Negev Desert and chronologies of alluvial surfaces (e.g., Amit et al, 1993Amit et al, , 2006Amit et al, , 2007Amit et al, , 2011Porat et al, 1996Porat et al, , 1997Porat et al, , 2009Porat et al, , 2010Matmon et al, 2009) support prevailing hyperarid conditions for most of the Quaternary, at least since the middle Pleistocene. If the southern Negev has remained hyperarid during the late Pleistocene, then what force is changing the geomorphic response of Nahal Yael?…”

Section: Introductionmentioning

confidence: 95%

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Late Quaternary weathering, erosion, and deposition in Nahal Yael, Israel: An "impact of climatic change on an arid watershed"?

Enzel¹,

Amit²,

Grodek³

et al. 2012

Geological Society of America Bulletin

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In their seminal paper in 1979, Bull andSchick proposed a conceptual model for the geomorphic response to Pleistocene to Holocene climate change, based on the hyperarid Nahal Yael watershed in the southern Negev Desert. In this model, the change from semiarid late Pleistocene to hyperarid early Holo cene climates reduced vegetation cover, increased the yield of sediment from slopes, and accelerated aggradation of terraces and alluvial fans. The model is now over 30 yr old, and during this time, chronologic, paleoenvironmental, and hydrogeomorphic research has advanced. Here, we reevaluate the model using data acquired in Nahal Yael over the 30 yr since the original model was proposed. Recent studies indicate that the late Pleistocene climate was hyperarid, and a transition from semiarid to hyperarid climates did not occur. The revised chronology reveals a major 35-20 ka episode of accelerated late Pleistocene sediment production on slopes (with lower rates probably already at ca. 50 ka) due to increased frequency of wetting-drying cycles caused by frequent extreme storms and fl oods between 35 and 27 ka. Without lag time, these sediments were transported and aggraded in depositional landscape components (fl uvial terraces and alluvial fans). This intensifi ed sediment production and delivery phase is unrelated to the Pleistocene-Holocene transition. The depositional landforms were rapidly incised between 20 and 18 ka. Since and/or soon after this Last Glacial Maximum (LGM) incision, most material leaving the basin originated from sediments stored in depositional landforms and was not produced from bedrock.Using these new data, we propose a revision to the Bull and Schick model in this hyperarid environment. Our revision suggests that the model should include the frequent storms and fl oods responsible for a late Pleistocene pulse of intense weathering due to numerous cycles of wetting and drying on slopes and coeval sediment transport to fl uvial terraces and alluvial fans. We also discuss the common use and pitfalls of using the Bull and Schick conceptual model to explain observations in diverse arid environments, usually without suffi cient data on basin-specifi c stratigraphic, chronologic, paleoenvironmental, and paleoclimatic information.

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“…Roskin et al, 2011aRoskin et al, , 2011bRoskin et al, , 2012Amit et al, 2011), or on the Negev highlands (Avni et al, 2012) where fluvio-loess with bright but partially bleached luminescence signals was dated. Few studies examine luminescence characteristics and provide OSL ages of wadi sediments in the study area.…”

Section: Introductionmentioning

confidence: 99%