The rise and fall of Lake Bonneville between 45 and 10.5 ka

Abstract

The rise and fall of Lake Bonneville between 45 and 10.5 ka The rise and fall of Lake Bonneville between 45 and 10.5 ka Part of the Geology Commons, Oceanography and Atmospheric Sciences and Meteorology Commons, Other Earth Sciences Commons, and the Other Environmental Sciences Commons Benson, L.V.; Lund, S.P.; Smoot, J.P.; Rhode, D.E.; Spencer, R.J.; Verosub, K.L.; Louderback, L.A.; Johnson, C.A.; Rye, R.O.; and Negrini, R.M., "The rise and fall of Lake Bonneville between 45 and 10.5 ka" (2011). USGS Staff --Published Research. 726. a b s t r a c tA sediment core taken from the western edge of the Bonneville Basin has provided high-resolution proxy records of relative lake-size change for the period 45.1e10.5 calendar ka (hereafter ka). Age control was provided by a paleomagnetic secular variation (PSV)-based age model for Blue Lake core BL04-4.Continuous records of d 18 O and total inorganic carbon (TIC) generally match an earlier lake-level envelope based on outcrops and geomorphic features, but with differences in the timing of some hydrologic events/states. The Stansbury Oscillation was found to consist of two oscillations centered on 25 and 24 ka. Lake Bonneville appears to have reached its geomorphic highstand and began spilling at 18.5 ka. The fall from the highstand to the Provo level occurred at 17.0 ka and the lake intermittently overflowed at the Provo level until 15.2 ka, at which time the lake fell again, bottoming out at w14.7 ka.The lake also fell briefly below the Provo level at w15.9 ka. Carbonate and d 18 O data indicate that between 14.7 and 13.1 ka the lake slowly rose to the Gilbert shoreline and remained at about that elevation until 11.6 ka, when it fell again. Chemical and sedimentological data indicate that a marsh formed in the Blue Lake area at 10.5 ka.Relatively dry periods in the BL04-4 records are associated with Heinrich events H1eH4, suggesting that either the warming that closely followed a Heinrich event increased the evaporation rate in the Bonneville Basin and (or) that the core of the polar jet stream (PJS) shifted north of the Bonneville Basin in response to massive losses of ice from the Laurentide Ice Sheet (LIS) during the Heinrich event. The second Stansbury Oscillation occurred during Heinrich event H2, and the Gilbert wet event occurred during the Younger Dryas cold interval. Several relatively wet events in BL04-4 occur during Dansgaard-Oeschger (DO) warm events.The growth of the Bear River glacier between 32 and 17 ka paralleled changes in the values of proxy indicators of Bonneville Basin wetness and terminal moraines on the western side of the Wasatch Mountains have ages ranging from 16.9 to 15.2 ka. This suggests a near synchroneity of change in the hydrologic and cryologic balances occurring in the Bonneville drainage system and that glacial extent was linked to lake size.

Temporal correspondence between pluvial lake highstands in the southwestern US and Heinrich Event 1

“…(A) Summed probability density function (PDF) of calibrated 14 C ages for dated highstand beach ridges, weighted to reflect confidence. (B) Hydrograph for pluvial Lake Bonneville (Oviatt, 1997;Benson et al, 2011;Godsey et al, 2011). Dashed line represents a hypothetical trajectory had overflow not occurred.…”

“…Shortly before H1 the mean position of the PJS reached a latitude centered over the Bonneville and Lahontan basins ($418N), raising the water level in both lakes, initiating Bonneville overflow at ca. 18.5k cal a BP (Oviatt, 1997;Benson et al, 2011) and causing sub-basins of Lake Lahontan to coalesce (Benson et al, 2012). This arrangement preconditioned the hydrology of the northern Great Basin so that augmentation of westerly moisture flow in response to H1-induced strengthening of the Aleutian Low at ca.…”

Insights from a synthesis of old and new climate-proxy data from the Pyramid and Winnemucca lake basins for the period 48 to 11.5 cal ka

“…The PLC08-1 proxy-climate data sets also are compared to previously published (Benson et al, 2011) high-resolution proxyclimate data sets from the Bonneville Basin (Fig. 1), which also were registered within a PSV-based age model.…”

“…3e5 and Supplementary Figs. 1e5) of Benson et al (2011). The PSV data sets determined on core PLC08-1 will be included in a forthcoming paper which documents the existence of both the Mono Lake and Laschamp magnetic excursions in sediments of the Pyramid and Mono lake basins.…”

Essentials of Endorheic Basins and Lakes: A Review in the Context of Current and Future Water Resource Management and Mitigation Activities in Central Asia

“…The decrease of water levels between 1973 and 1976 caused the lake to split into Big Lake Chad (northern) and Small Lake Chad (southern) [16]. 3 Cross et al [10], 4 Dejoux [13], 5 Gao et al [15], Isiorho and Matisof [18], 6 Habeck-Fardy and Nanson [19].…”