Isotopic evidence for Holocene January air temperature variability on the East Chukotka PeninsulaстатьяИсследовательская статья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 6 декабря 2018 г.
Аннотация:Ice‐wedge ice can provide a valuable record of past winter climate variability at high
latitudes yet to date this proxy has been applied only sparsely across the Chukotka
region of Siberia. Here we present and data from eight ice‐wedges at four sites across
a 600‐km transect in Eastern Chukotka which we use to reconstruct regional Holocene
winter paleotemperature. The Holocene age of ice‐wedges was established by
radiocarbon dating of peat surrounding individual ice‐wedges. Our suite of
radiocarbon ages suggests that the studied ice‐wedges formed between 12.9–11.8
and 3–2.5 cal ka BP. δ18O and δ2H values from ice‐wedge ice indicate that in
coastal areas of Eastern Chukotka mean January air temperatures in the first half of
the Holocene were on average 2–3°С lower than modern values, a finding that
corresponds well with winter climate reconstructions for the other areas of Beringia.
The variability of reconstructed mean January air temperatures in the study area did
not exceed 2–4°C during the early to mid‐Holocene.