Isotope composition of snow from individual snowfall in the northeast of Europe, December 2003

Isotope composition of snow samples from individual snowfall was measured on the transect of approximately 1400 km through the northeast of Europe from Konosha station through Inta Town and Seida Town up to Polar Ural. Stable isotope contents of Oxygen-18 and Deuterium as well as Deuterium excess are not constant in uniform air mass, but strongly vary depending on condensation temperature. It is demonstrated that the values of Oxygen-18 and deuterium decrease by 1.4 and 10.8 ‰ per 1 degree of latitude. With decreasing Oxygen-18 content by 8.17 ‰ and Deuterium by 60.3 ‰, Deuterium excess increases by 8.1 ‰. Data was collected inthe northeast of Europe between December 23rd and 24th 2003

Isotopic composition of oxygen (δ18О) and hydrogen (δD) of ice-wedge ice in central Yamal Peninsula

A new data on the isotope composition of oxygen (δ18О) and hydrogen (δD) of the ice-wedge ice in central Yamal Peninsula near Bovanenkovo gas field are presented. In the summer of 2019, ice wedges in the thermal circus of the third sea terrace was studied. On the terrace surface a polygon size of about 10-20 m is widespread. The ice wedge № 1 had a width in the upper part of 1.5, the apparent depth in exposure was 2.3 m. The ice wedge № 2 was stretched perpendicular to of the ice wedge № 1 and had a width of about 60 cm. A fragment of ice wedge № 3 in longitudinal section was opened 20 m from the ice wedges. Age of ice is established by AMS dating to be 13.6 cal. BP. The isotopic signature of ice (average δ18О and δD values were -24.8 and -187.6 ‰ respectively), corresponds to ice-wedges of the Yamal Peninsula formed during the MIS-2 isotope stage (end of Late Pleistocene). The oxygen isotope composition of ice indicates temperatures of the cold period of wedges formation around -22.8 ÷ -26.8 ⁰С (on average 7 ⁰С colder than modern), and January temperatures from -34.2 ÷ -40.2 ⁰С (on average 10 ⁰С colder than modern). For some ice samples, high values of deuterium excess were noted (from 12 to 17 ‰), which is unusual for this type of ice

Radiocarbon chronology of Holocene palsa of Bol'shezemel'skaya tundra in Russian North

Six palsa mire in Usa River valley and in Vorkuta area in North-eastern part of European Russia were studied in detail. In total 75 new ¹⁴C dates from different palsa sections were obtained. In palsa mire near Bugry Settlement 3.2 m high palsa dated from 8.6 to 2.1 ka BP. The permafrost and palsa began 2.1 ka BP. In palsa mire near Usa Settlement low moor peat in 2 m high palsa dated 3690 BP, palsa began to heave at least 3700 BP. A low-moor peat of 2.5 m high palsa indicates the change in the hydrological-mineral regime during 7.1 to 6.3 ka BP, heaving commenced 6 ka BP. A number of 8 ¹⁴C dates from 5.6 to 2.7 ka BP obtained from peat of 3 m high palsa. Near Abez' Settlement palsa development began about 2.8 ka BP. There are both large and smaller palsas. Low-moor peat of 3.5 m high palsa is dated between 9180 BP to 6730 BP near Nikita Settlement. In Vorkuta area near Khanovey Settlement the northern most palsa is found. The ¹⁴C age of peat at slope of the palsa is much younger, than in an axial part, there is inversion of the dates: the date 3.5 ka BP is between dates 2.9 and 2.8 ka BP. It is probably caused by creep of peat downwards from a summit. This evidenced this frozen mound is real palsa, but not a residual form as a result of erosion

δ¹⁸O patterns in massive ice, Gyda River terrace I, northern Gydan Peninsula

Lenses of massive ground ice and cryopegs were found at different levels in Holocene deposits in the northeastern Yamal Peninsula. Massive ice, 7 to 9 m thick, occurs at the depth 12 m under the Seyakha (Mutnaya) River. Multistage massive ground ice (four lenses, 0.4 m thick and 8 m long) exists in Gyda terrace I. Lateral and vertical δ18O isotope patterns in the Sabetta and Gyda multistage massive ice complexes indicate their heterogeneity and intrasedimental origin by segregation or a combined intrusive-segregation mechanism