Long-term Changes of Water Flow, Water Temperature and Heat Flux of the Largest Siberian Riversстатья

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Дата последнего поиска статьи во внешних источниках: 6 мая 2019 г.

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1. Полный текст Long-term_Changes_of_Water_Flow_Water_Temperature_and_Hea... 4,5 МБ 23 октября 2018 [kategeo]

[1] Georgiadi A. G., Kashutina Е. A., Milyukova I. P. Long-term changes of water flow, water temperature and heat flux of the largest siberian rivers // Polarforschung. — 2018. — Vol. 87, no. 2. — P. 167–176. Long – more than 15 to 20 years – phases of increased and de– creased water flow, water temperature and heat flux with respect to the average values, calculated for the entire period of observation in the largest rivers of Siberia (Ob’, Yenisei and Lena) were analysed. Time delimitation of the contrasting phases (change point detection) was determined via statistical criteria (Mann-Whitney-Pettit test, cumulative deviation test, sequential regime shift detector) as well as by normalized cumulative deviation curves. The identified phases display statistically significant differences in average values for the considered characteristics. The long-term changes in water flow and heat flux, which occurred in the last 70 to 80 years, are mainly characterized by two major long phases with a border in the 1970s to 1990s with the exception of the Yenisei, where additional phase of increased heat flux presents. The long-term changes in water temperature have more complex behaviour. On the Lena, there were also two contrasting phases, whereas on the Yenisei and the Ob’, apart from the two main phases, there were respectively one and two additional phases. In addition, the contribution of anthropogenic impact and climate change to total changes in the water flow and heat flux was estimated during the period of the most intense anthropogenic impact (since the 1960s), mainly related to the operation of the water reservoir system. [ DOI ]

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