Long-term winter warming trend in the Siberian Arctic during the mid to late Holoceneстатья
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: 2 апреля 2015 г.
Аннотация:Relative to the past 2,000 years1,2, the Arctic region has
warmed significantly over the past few decades. However,
the evolution of Arctic temperatures during the rest of the
Holocene is less clear. Proxy reconstructions, suggest a longterm
cooling trend throughout the mid- to late Holocene3–5,
whereas climate model simulations show only minor changes
or even warming6–8. Here we present a record of the oxygen
isotope composition of permafrost ice wedges from the Lena
River Delta in the Siberian Arctic. The isotope values, which
reflect winter season temperatures, became progressively
more enriched over the past 7,000 years, reaching unprecedented
levels in the past five decades. This warming trend
during the mid- to late Holocene is in opposition to the
cooling seen in other proxy records3,5,9. However, most of
these existing proxy records are biased towards summer
temperatures. We argue that the opposing trends are related
to the seasonally dierent orbital forcing over this interval.
Furthermore, our reconstructed trend as well as the recent
maximum are consistent with the greenhouse gas forcing and
climate model simulations, thus reconciling diering estimates
of Arctic and northern high-latitude temperature evolution
during the Holocene.