Browsing by Subject "LAURENTIAN GREAT-LAKES"

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  • Su, Dongsheng; Wen, Lijuan; Gao, Xiaoqing; Leppäranta, Matti; Song, Xingyu; Shi, Qianqian; Kirillin, Georgiy (2020)
    Qinghai Lake is the largest lake in China. However, its influence on the local climate remains poorly understood. By using an atmosphere-lake coupled model, we investigated the impact of the lake on the local climate. After the adjustment of four key parameters, the model reasonably reproduced the lake-air interaction. Superimposed by the orographic effects on lake-land breeze circulation, the presence of the lake enhanced precipitation over the southern part of the lake and its adjacent land, while slightly reduced precipitation along the northern shore of the lake. The lake effect on local precipitation revealed a distinct seasonal and diurnal variability, reducing precipitation in May (-6.6%) and June (-4.5%) and increasing it from July (5.7%) to November (125.6%). During the open water season, the lake's daytime cooling effect weakened and the nighttime warming effect strengthened, affecting spatial distribution and intensity of lake-induced precipitation. In early summer, precipitation slightly decreased over the north part of the lake due to the lake's daytime cooling. In turn, lake-induced nighttime warming increased precipitation over the southern section of the lake and its adjacent land. With the start of the autumn cooling in September, heat and moisture fluxes from the lake resulted in precipitation increase in both daytime and nighttime over the entire lake. In October, the background atmospheric circulation coupled with the strong lake effects lead to a small amount but high proportion of lake-induced precipitation spreading evenly over the lake.
  • Yang, Yu; Cheng, Bin; Kourzeneva, Ekaterina; Semmler, Tido; Rontu, Laura; Lepparanta, Matti; Shirasawa, Kunio; Li, Zhijun (2013)
  • Jenny, Jean-Philippe; Anneville, Orlane; Arnaud, Fabien; Baulaz, Yoann; Bouffard, Damien; Domaizon, Isabelle; Bocaniov, Serghei A.; Chevre, Nathalie; Dittrich, Maria; Dorioz, Jean-Marcel; Dunlop, Erin S.; Dur, Gael; Guillard, Jean; Guinaldo, Thibault; Jacquet, Stephan; Jamoneau, Aurelien; Jawed, Zobia; Jeppesen, Erik; Krantzberg, Gail; Lenters, John; Leoni, Barbara; Meybeck, Michel; Nava, Veronica; Noges, Tiina; Noges, Peeter; Patelli, Martina; Pebbles, Victoria; Perga, Marie-Elodie; Rasconi, Serena; Ruetz, Carl R.; Rudstam, Lars; Salmaso, Nico; Sapna, Sharma; Straile, Dietmar; Tammeorg, Olga; Twiss, Michael R.; Uzarski, Donald G.; Ventela, Anne-Mari; Vincent, Warwick F.; Wilhelm, Steven W.; Wangberg, Sten-Ake; Weyhenmeyer, Gesa A. (2020)
    Large lakes of the world are habitats for diverse species, including endemic taxa, and are valuable resources that provide humanity with many ecosystem services. They are also sentinels of global and local change, and recent studies in limnology and paleolimnology have demonstrated disturbing evidence of their collective degradation in terms of depletion of resources (water and food), rapid warming and loss of ice, destruction of habitats and ecosystems, loss of species, and accelerating pollution. Large lakes are particularly exposed to anthropogenic and climatic stressors. The Second Warning to Humanity provides a framework to assess the dangers now threatening the world's large lake ecosystems and to evaluate pathways of sustainable development that are more respectful of their ongoing provision of services. Here we review current and emerging threats to the large lakes of the world, including iconic examples of lake management failures and successes, from which we identify priorities and approaches for future conservation efforts. The review underscores the extent of lake resource degradation, which is a result of cumulative perturbation through time by long-term human impacts combined with other emerging stressors. Decades of degradation of large lakes have resulted in major challenges for restoration and management and a legacy of ecological and economic costs for future generations. Large lakes will require more intense conservation efforts in a warmer, increasingly populated world to achieve sustainable, high-quality waters. This Warning to Humanity is also an opportunity to highlight the value of a long-term lake observatory network to monitor and report on environmental changes in large lake ecosystems. (C) 2020 The Authors. Published by Elsevier B.V. on behalf of International Association for Great Lakes Research.