caa a22 4500 465814514 CHVBK 20180323112123.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF00209522 doi (NATIONALLICENCE)springer-10.1007/BF00209522 Paleoclimatic implications of the high stand of Lake Lahontan derived from models of evaporation and lake level [Elektronische Daten] [S. Hostetler, L.V. Benson] Based on previous climate model simulations of a split of the polar jet stream during the late Pleistocene, we hypothesize that (1) 20-13.5 ka BP, season-to-season variation in the latitudinal maximum of the jet stream core led to enhanced wetness in the Great Basin, and (2) after 13.5 ka BP, northward movement of the jet stream resulted in increased aridity similar to today. We suggest that the enhanced effective wetness was due to increased precipitation combined with an energy-limited reduction in evaporation rates that was caused by increased summer cloud cover. A physically based thermal evaporation model was used to simulate evaporation for Lake Lahontan under various hypothesized paleoclimates. The simulated evaporation rates, together with hypothetical rates of precipitation and discharge, were input to a water balance model of Lake Lahontan. A 42% reduction in evaporation rate, combined with maximum historical rates of precipitation (1.8 times the mean annual rate) and discharge (2.4 times the mean annual rate), were sufficient to maintain Lake Lahontan at its 20-15 ka BP level. When discharge was increased to 3.8 times the present-day, mean annual rate, the ∼ 13.5 ka BP maximum level of Lake Lahontan was attained within 1400 years. A 135-m drop from the maximum level to Holocene levels was simulated within 300 years under the imposition of the present-day hydrologic balance. Springer-Verlag, 1990 Hostetler S. US Geological Survey, National Center for Atmospheric Research, P.O. Box 3000ML, 80301-3000, Boulder, Co, USA aut Benson L.V. US Geological Survey, National Center for Atmospheric Research, P.O. Box 3000ML, 80301-3000, Boulder, Co, USA aut Climate Dynamics Springer-Verlag 4/3(1990-09-01), 207-217 0930-7575 4:3<207 1990 4 382 https://doi.org/10.1007/BF00209522 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00209522 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hostetler S. US Geological Survey, National Center for Atmospheric Research, P.O. Box 3000ML, 80301-3000, Boulder, Co, USA aut NATIONALLICENCE 700 1- Benson L.V. US Geological Survey, National Center for Atmospheric Research, P.O. Box 3000ML, 80301-3000, Boulder, Co, USA aut NATIONALLICENCE 773 0- Climate Dynamics Springer-Verlag 4/3(1990-09-01), 207-217 0930-7575 4:3<207 1990 4 382 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer