Hydrological Conditions Of Drained Lake Basins Of The Anadyr Lowland Under Changing Climatic Conditions
Hydrological Conditions Of Drained Lake Basins Of The Anadyr Lowland Under Changing Climatic Conditions
复制标题
气候变化条件下阿纳德尔低地干涸湖盆的水文条件
DOI：
10.24057/2071-9388-2021-030
复制
发表时间：
2021
影响因子：
--
通讯作者：
V. Shamov
中科院分区：
文献类型：
--
作者：
Оleg D. Tregubov;V. Glotov;P. Konstantinov;V. Shamov
北极低地的湖泊既是气候和冻土变化的唯一指标，也是其结果。利用遥感方法和野外测量方法，研究了阿纳迪尔低地湖泊近65年来形态计量指标动态的模式和特征。分析了位于排涝湖盆底、河漫滩、海滨阶地的面积为0.02~0.3km2的36个湖泊的参数。对22个典型湖泊进行了实地调查。所考虑的季节融化动态是基于对1994-2020年活动层的监测。由于年平均气温升高1.8℃，以及年平均降水量先增后减135毫米，研究区域内湖泊面积的平均份额减少了24%。首次发现，湖滨带的低温作用与降水和气温的影响同时影响湖泊面积的变化。在野外观测的基础上，我们认为天然排水有两个原因：湖泊通过新形成的热岩溶和热侵蚀面流渠道排出，以及由于海岸带季节性融化活跃层深度的变化，导致冻土上地下水补给量减少。
The lakes of the Arctic lowlands are both the unique indicator and the result of climatic and permafrost changes. Remote sensing methods and field measurements were used to consider the patterns and features of the morphometric indicators dynamics of the Anadyr lowland lakes over 65 years. We analyzed the parameters of 36 lakes with an area of 0.02–0.3 km2 located in the bottoms of drained lake basins, in river floodplains, on sea-shore terraces. Field studies were conducted on 22 typical lakes. The considered dynamics of seasonal thawing are based on the monitoring of the active layer for 1994–2020. Due to an increase of mean annual air temperature by 1.8 °C, as well as an increase and then a decrease in the mean annual precipitation by 135 mm, the average share of a lake area in the study area decreased by 24%. It is shown for the first time that cryogenic processes of the lacustrine coastal zone affect the change in the area of lakes simultaneously with the influence of precipitation and air temperature. Based on field observations, we considered two causes of natural drainage: discharge of the lakes through newly formed thermokarst and thermoerosional surface flow channels and decrease in suprapermafrost groundwater recharge as a result of changing depth of seasonally thawed active layer in the coastal zone.