On the Dependence of the ice Formation in the Lake Ladoga on the Air Temperature

• Main Authors: S. Karetnikov G., С. Каретников Г.
• Other Authors: The work was carried out according to the research plan of Institute of Limnology RAS for 2019–2023 № FMNG-2019-0001 “Integrated assessment of Lake Ladoga ecosystem dynamics and its watershed under the influence of natural and anthropogenic factors”., Работа выполнена по теме плана НИР ИНОЗ РАН – СПб ФИЦ РАН на 2019– 2023 гг. № FMNG-2019-0001 “Комплексная оценка динамики экосистем Ладожского озера и водоемов его бассейна под воздействием природных и антропогенных факторов”.
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: IGRAS 2023
• Subjects: Lake Ladoga;Primary ice phenomena;air temperature;Lake depths; Ладожское озеро;первичные ледовые явления;температура воздуха;глубины озера; The Cryosphere
• Online Access: https://ice-snow.igras.ru/jour/article/view/1227; https://doi.org/10.31857/S2076673423020096

The purpose of the work was to establish regularities of the ice formation in the largest European Lake Ladoga depending on the air temperature. The average daily air temperatures obtained at the Sortavala weather station for thirty years were used for the analysis. The main task was to determine the sums of accumulated average daily air temperatures necessary for the appearance of primary ice phenomena in areas with different depths of the Lake. To solve this problem digitized remote sensing data of the spatial distribution of ice in the fixed cells with known average depth and data on average daily air temperatures were used. For thirty last winters, the dates of the first ice appearance in each of 180 cells were selected, which were related to the accumulated to this date sum of mean daily air temperatures after its steady transition through 0°С towards the negative values. The resulting scheme of the accumulated sums of air temperatures needed for the ice appearance indicates their regular growth with increasing depth. It is assumed that this dependence will make it possible to assess dynamics of ice formation on other lakes. Приведены дистанционные данные о распределении льда на акватории Ладожского озера за последние тридцать зим. По данным метеостанции Сортавала подсчитывались накопления льда после устойчивого перехода через 0°C в сторону отрицательных значений суммы среднесуточных температур воздуха. Получена схема продвижения кромки льда при замерзании озера в зависимости от накопленной суммы среднесуточных температур воздуха.