THE HYDROLOGIC RESPONSE OF DESERT WETLANDS TO ABRUPT CLIMATE CHANGE IN THE SOUTHERN GREAT BASIN AND MOJAVE DESERTS

2016 ◽  
Author(s):  
Kathleen B. Springer ◽  
◽  
Jeffrey S. Pigati ◽  
Shannon A. Mahan ◽  
Jordon Bright ◽  
...  
2016 ◽  
Author(s):  
Kathleen B. Springer ◽  
◽  
Jeffrey S. Pigati ◽  
Jeffrey S. Pigati ◽  
Craig R. Manker ◽  
...  

2015 ◽  
Vol 112 (47) ◽  
pp. 14522-14526 ◽  
Author(s):  
Kathleen B. Springer ◽  
Craig R. Manker ◽  
Jeffrey S. Pigati

Desert wetlands are keystone ecosystems in arid environments and are preserved in the geologic record as groundwater discharge (GWD) deposits. GWD deposits are inherently discontinuous and stratigraphically complex, which has limited our understanding of how desert wetlands responded to past episodes of rapid climate change. Previous studies have shown that wetlands responded to climate change on glacial to interglacial timescales, but their sensitivity to short-lived climate perturbations is largely unknown. Here, we show that GWD deposits in the Las Vegas Valley (southern Nevada, United States) provide a detailed and nearly complete record of dynamic hydrologic changes during the past 35 ka (thousands of calibrated 14C years before present), including cycles of wetland expansion and contraction that correlate tightly with climatic oscillations recorded in the Greenland ice cores. Cessation of discharge associated with rapid warming events resulted in the collapse of entire wetland systems in the Las Vegas Valley at multiple times during the late Quaternary. On average, drought-like conditions, as recorded by widespread erosion and the formation of desert soils, lasted for a few centuries. This record illustrates the vulnerability of desert wetland flora and fauna to abrupt climate change. It also shows that GWD deposits can be used to reconstruct paleohydrologic conditions at millennial to submillennial timescales and informs conservation efforts aimed at protecting these fragile ecosystems in the face of anthropogenic warming.


2015 ◽  
Vol 387 ◽  
pp. 145-146 ◽  
Author(s):  
Kathleen Springer ◽  
Craig R. Manker ◽  
Jeffrey S. Pigati ◽  
Shannon A. Mahan

Author(s):  
Bernhard Weninger ◽  
Lee Clare

Recent advances in palaeoclimatological and meteorological research, combined with new radiocarbon data from western Anatolia and southeast Europe, lead us to formulate a new hypothesis for the temporal and spatial dispersal of Neolithic lifeways from their core areas of genesis. The new hypothesis, which we term the Abrupt Climate Change (ACC) Neolithization Model, incorporates a number of insights from modern vulnerability theory. We focus here on the Late Neolithic (Anatolian terminology), which is followed in the Balkans by the Early Neolithic (European terminology). From high-resolution 14C-case studies, we infer an initial (very rapid) west-directed movement of early farming communities out of the Central Anatolian Plateau towards the Turkish Aegean littoral. This move is exactly in phase (decadal scale) with the onset of ACC conditions (~6600 cal BC). Upon reaching the Aegean coastline, Neolithic dispersal comes to a halt. It is not until some 500 years later—that is, at the close of cumulative ACC and 8.2 ka cal BP Hudson Bay cold conditions—that there occurs a second abrupt movement of farming communities into Southeast Europe, as far as the Pannonian Basin. The spread of early farming from Anatolia into eastern Central Europe is best explained as Neolithic communities’ mitigation of biophysical and social vulnerability to natural (climate-induced) hazards.


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