TY - JOUR

T1 - Gas-emission craters of the Yamal and Gydan peninsulas

T2 - A proposed mechanism for lake genesis and development of permafrost landscapes

AU - Dvornikov, Yury A.

AU - Leibman, Marina O.

AU - Khomutov, Artem V.

AU - Kizyakov, Alexander I.

AU - Semenov, Petr

AU - Bussmann, Ingeborg

AU - Babkin, Evgeny M.

AU - Heim, Birgit

AU - Portnov , Alexey

AU - Babkina, Elena A.

AU - Streletskaya, Irina D.

AU - Chetverova, Antonina A.

AU - Kozachek, Anna

AU - Meyer, Hanno

N1 - Publisher Copyright: © 2019 John Wiley & Sons, Ltd.

PY - 2019/7

Y1 - 2019/7

N2 - This paper describes two gas-emission craters (GECs) in permafrost regions of the Yamal and Gydan peninsulas. We show that in three consecutive years after GEC formation (2014–2017), both morphometry and hydrochemistry of the inner crater lakes can become indistinguishable from other lakes. Craters GEC-1 and AntGEC, with initial depths of 50–70 and 15–19 m respectively, have transformed into lakes 3–5 m deep. Crater-like depressions were mapped in the bottom of 13 out of 22 Yamal lakes. However, we found no evidence that these depressions could have been formed as a result of gas emission. Dissolved methane (dCH4) concentration measured in the water collected from these depressions was at a background level (45 ppm on average). Yet, the concentration of dCH4 from the near-bottom layer of lake GEC-1 was significantly higher (824–968 ppm) during initial stages. We established that hydrochemical parameters (dissolved organic carbon, major ions, isotopes) measured in GEC lakes approached values measured in other lakes over time. Therefore, these parameters could not be used to search for Western Siberian lakes that potentially resulted from gas emission. Temperature profiles measured in GEC lakes show that the water column temperatures in GEC-1 are lower than in Yamal lakes and in AntGEC – close to values of Gydan lakes. Given the initial GEC depth > 50 m, we suggest that at least in GEC-1 possible re-freezing of sediments from below might take place. However, with the present data we cannot establish the modern thickness of the closed talik under newly formed GEC lakes.

AB - This paper describes two gas-emission craters (GECs) in permafrost regions of the Yamal and Gydan peninsulas. We show that in three consecutive years after GEC formation (2014–2017), both morphometry and hydrochemistry of the inner crater lakes can become indistinguishable from other lakes. Craters GEC-1 and AntGEC, with initial depths of 50–70 and 15–19 m respectively, have transformed into lakes 3–5 m deep. Crater-like depressions were mapped in the bottom of 13 out of 22 Yamal lakes. However, we found no evidence that these depressions could have been formed as a result of gas emission. Dissolved methane (dCH4) concentration measured in the water collected from these depressions was at a background level (45 ppm on average). Yet, the concentration of dCH4 from the near-bottom layer of lake GEC-1 was significantly higher (824–968 ppm) during initial stages. We established that hydrochemical parameters (dissolved organic carbon, major ions, isotopes) measured in GEC lakes approached values measured in other lakes over time. Therefore, these parameters could not be used to search for Western Siberian lakes that potentially resulted from gas emission. Temperature profiles measured in GEC lakes show that the water column temperatures in GEC-1 are lower than in Yamal lakes and in AntGEC – close to values of Gydan lakes. Given the initial GEC depth > 50 m, we suggest that at least in GEC-1 possible re-freezing of sediments from below might take place. However, with the present data we cannot establish the modern thickness of the closed talik under newly formed GEC lakes.

KW - газоэмиссионные кратеры

KW - озёра

KW - Гыдан

KW - Ямал

KW - метан

KW - CARBON

KW - IN-GROUND ICE

KW - MACKENZIE DELTA REGION

KW - METHANE

KW - NORTHWEST-TERRITORIES

KW - SEDIMENTS

KW - SHELF

KW - ZONE

KW - gas-emission craters

KW - gydan

KW - lakes

KW - methane

KW - yamal

UR - http://www.scopus.com/inward/record.url?scp=85069818328&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/gasemission-craters-yamal-gydan-peninsulas-proposed-mechanism-lake-genesis-development-permafrost-la

U2 - 10.1002/ppp.2014

DO - 10.1002/ppp.2014

M3 - Article

AN - SCOPUS:85069818328

VL - 30

SP - 146

EP - 162

JO - Permafrost and Periglacial Processes

JF - Permafrost and Periglacial Processes

SN - 1045-6740

IS - 3

ER -