Instituto de Ecorregiones Andinas (INECOA), CONICET-UNJu, Av. Bolivia 1239, San Salvador de Jujuy, Jujuy Y4600, Argentina; Instituto de Geología y Minería, Universidad Nacional de Jujuy, Av. Bolivia 1661, San Salvador de Jujuy, Jujuy Y4600, Argentina; Facultad de Ingeniería, Universidad Nacional de Jujuy, Av. Ítalo Palanca 10, San Salvador de Jujuy, Jujuy Y4600, Argentina.
Instituto de Ecorregiones Andinas (INECOA), CONICET-UNJu, Av. Bolivia 1239, San Salvador de Jujuy, Jujuy Y4600, Argentina; Instituto de Geología y Minería, Universidad Nacional de Jujuy, Av. Bolivia 1661, San Salvador de Jujuy, Jujuy Y4600, Argentina; Facultad de Ciencias Agrarias, Universidad Nacional de Jujuy, J. B. Alberdi 47, San Salvador de Jujuy, Jujuy Y4600, Argentina.
Sci Total Environ. 2021 May 1;767:144926. doi: 10.1016/j.scitotenv.2020.144926. Epub 2021 Jan 29.
The Altiplano-Puna Plateau holds several shallow lakes, which are very sensitive to climate changes. This work is focused on a high-altitude lake system called Lagunas de Vilama (LVS), located in a complex climatic transition area with scarcity of continuous and homogeneous instrumental records. The objective of this study is to determine the regional spatial-temporal variability of precipitation and evaluate the seasonal and interannual lake responses. We use a lake-surfaces record derived from Landsat images to investigate links with regional precipitations and different climatic forcings. The results reveal that austral summer and autumn precipitations control the variability of the annual lake-surfaces. Also, we found intra-annual and interannual lags in the lake responses to precipitations, and identified several wet and dry stages. Our results show negative trends in precipitations and lake-surfaces, whose were strengthened by a shift to a warm phase of the Atlantic Multidecadal Oscillation in the 1990s. The El Niño Southern Oscillation, Pacific Decadal Oscillation, and Southern Annular Mode also exert a strong influence in the region. This study demonstrates that the variability of LVS lakes is strongly related to the South American Monsoon System dynamics and large-scale climate forcings from the Pacific and Atlantic Oceans. This work provides novel indices which demonstrated to be good indicators of regional hydro-climatological variability for this region of South America.
高原普纳高原拥有几个浅湖，这些湖泊对气候变化非常敏感。这项工作集中在一个名为拉古纳斯·德·维拉马（LVS）的高海拔湖泊系统上，该系统位于气候过渡区，气候复杂，缺乏连续和均匀的仪器记录。本研究的目的是确定降水的区域时空变化，并评估季节性和年际湖泊响应。我们使用从陆地卫星图像中获得的湖泊表面记录来调查与区域降水和不同气候强迫之间的联系。结果表明，南半球夏季和秋季降水控制着年湖泊表面的变化。此外，我们发现湖泊对降水的年内和年际响应存在滞后现象，并确定了几个干湿阶段。我们的结果表明，降水和湖泊表面呈负趋势，这种趋势在 20 世纪 90 年代大西洋多年代际振荡向暖相位转变时得到加强。厄尔尼诺南方涛动、太平洋年代际振荡和南极环模态也对该地区有强烈影响。本研究表明，LVS 湖泊的变化与南美季风系统的动态以及来自太平洋和大西洋的大规模气候强迫密切相关。本研究提供了新的指数，这些指数被证明是该南美地区区域水文气候变化的良好指标。
