TY - JOUR

T1 - Inflow of surface and groundwater to Lake Ladoga based on stable isotope (2H, 18O) composition

AU - Tokarev, Igor

AU - Rumyantsev, Vladislav

AU - Rybakin, Vladimir

AU - Yakovlev, Evgeny

N1 - Publisher Copyright: © 2022 International Association for Great Lakes Research

PY - 2022/8

Y1 - 2022/8

N2 - Stable isotope (deuterium – 2H and oxygen-18 – 18O) surveys of water in Lake Ladoga and several rivers and small lakes within its watershed were conducted during 2012–2018. Over these 6 years, specific spatial and time differences in water isotope composition of Ladoga and small water bodies and streams were found. These differences depended firstly, on wetland type and the lakes distribution on the watershed and secondly, on groundwater discharge and type of lithological substrate (geological sediments or crystalline rocks). Besides landscape, climate (air temperature, precipitation, evapotranspiration) is a main physical factor which controls all scales of the stable isotope variations. In modern times, the sub-latitudinal gradient of climate but also presence of permafrost in the past effects the stable isotope variation. The isotopic composition divides the tributaries of Ladoga into three groups with a wide range of δ18O seasonal variations, and a significant atmospheric component. The isotopic composition of Ladoga water is generally stable ranging from δ18O = −11.7 to −9.5‰ (average δ18O = −10.6‰), δ2H = −84 to −74‰ (average δ2H = −78‰). The effect of evaporation is clearly seen due to accumulation of deuterium and oxygen-18 and a shift to the right from the Local Meteoric Water Line of δ2H versus δ18O diagram. In Lake Ladoga there is a local deviation of δ18O which can be explained by subaqueous discharge of groundwater from Riphean sediments.

AB - Stable isotope (deuterium – 2H and oxygen-18 – 18O) surveys of water in Lake Ladoga and several rivers and small lakes within its watershed were conducted during 2012–2018. Over these 6 years, specific spatial and time differences in water isotope composition of Ladoga and small water bodies and streams were found. These differences depended firstly, on wetland type and the lakes distribution on the watershed and secondly, on groundwater discharge and type of lithological substrate (geological sediments or crystalline rocks). Besides landscape, climate (air temperature, precipitation, evapotranspiration) is a main physical factor which controls all scales of the stable isotope variations. In modern times, the sub-latitudinal gradient of climate but also presence of permafrost in the past effects the stable isotope variation. The isotopic composition divides the tributaries of Ladoga into three groups with a wide range of δ18O seasonal variations, and a significant atmospheric component. The isotopic composition of Ladoga water is generally stable ranging from δ18O = −11.7 to −9.5‰ (average δ18O = −10.6‰), δ2H = −84 to −74‰ (average δ2H = −78‰). The effect of evaporation is clearly seen due to accumulation of deuterium and oxygen-18 and a shift to the right from the Local Meteoric Water Line of δ2H versus δ18O diagram. In Lake Ladoga there is a local deviation of δ18O which can be explained by subaqueous discharge of groundwater from Riphean sediments.

KW - Deuterium

KW - Groundwater

KW - Lake Ladoga

KW - Oxygen-18

KW - Tributaries

UR - http://www.scopus.com/inward/record.url?scp=85130451304&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/f02cd166-1941-3b48-a737-271d9e0fb822/

U2 - 10.1016/j.jglr.2022.04.019

DO - 10.1016/j.jglr.2022.04.019

M3 - Article

AN - SCOPUS:85130451304

VL - 48

SP - 890

EP - 902

JO - Journal of Great Lakes Research

JF - Journal of Great Lakes Research

SN - 0380-1330

IS - 4

ER -