Abstract
Climate change influences the temperature, ice and thermal regimes of lakes in the Northern Hemisphere. This study discusses the change in the heat content of the water column in the slope area of the southern basin of Lake Baikal under the influence of climate for the past 20 years. We clarify the seasonal variability of heat content in different water layers selected taking into account temperature and dynamic characteristics. During the study period, the value of heat content increased in the upper water layer (45–100 m) only in May (12.4 (MJ/m2)/year). In the water layers deeper than 100 m, the value of heat content decreased: −3–−4 (MJ/m2)/year from July to September in a layer of 100–300 m, −9–−13 (MJ/m2)/year in all months in a layer of 300–1100 m and −1.5–−3 (MJ/m2)/year in all months, except for January in a layer of 1100 m–bottom. Despite the revealed trends of the change in the heat content, the annual heat circulation remained within the normal range and did not have any trends.
Highlights
Slope Area of the Southern Basin ofThe influence of climate on the water temperature of the surface and deep-water layers is being investigated in many lakes of the world, e.g., [1,2,3,4,5,6,7,8,9]
This study aims to investigate seasonal and interannual changes in the heat content and the annual heat circulation in the water column of the slope area in the southern basin of Lake Baikal under the influence of climate for the past 20 years
±0.05 ◦ C, installed until March 2009 in the upper water layers where significant seasonal changes in water temperature were observed) series were used for records, which were installed at depths of 15–43 m to the bottom
Summary
The influence of climate on the water temperature of the surface and deep-water layers is being investigated in many lakes of the world, e.g., [1,2,3,4,5,6,7,8,9]. Some studies assess the influence of climate on ice regime, stratification and stability of waters, e.g., [10,11,12,13,14]. Baikal and temperature in the upper water layer of the lake in the second half of the 20th century. It was revealed that the trend value increases from south to north due to lower (i) wind intensity over the northern basin of Lake Baikal and (ii) epilimnion capacity
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