Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Jesper Sjolte

Jesper Sjolte

Forskare

Jesper Sjolte

Modelling the response of stable water isotopes in Greenland precipitation to orbital configurations of the previous interglacial

Författare

  • Jesper Sjolte
  • Georg Hoffmann
  • Sigfus Johann Johnsen

Summary, in English

The relation between delta O-18 of precipitation and temperature has been used in numerous studies to reconstruct past temperatures at ice core sites in Greenland and Antarctica. During the past two decades, it has become clear that the slope between delta O-18 and temperature varies in both space and time. Here, we use a general circulation model driven by changes in orbital parameters to investigate the Greenland delta O-18-temperature relation for the previous interglacial, the Eemian. In our analysis, we focus on changes in the moisture source regions, and the results underline the importance of taking the seasonality of climate change into account. The orbitally driven experiments show that continental evaporation over North America increases during summer in the warm parts of the Eemian, while marine evaporation decreases. This likely flattens the Greenland delta O-18 response to temperature during summer. Since the main climate change in the experiments occurs during summer this adds to a limited response of delta O-18, which is more strongly tied to temperature during winter than during summer. A south-west to north-east gradient in the delta O-18-temperature slope is also evident for Greenland, with low slopes in the south-west and steeper slopes in the north-east. This probably reflects the proportion of continental moisture and Arctic moisture arriving in Greenland, with more continental moisture in the south-west and less in the north-east, and vice versa for the Arctic moisture.

Avdelning/ar

  • Kvartärgeologi
  • MERGE: ModElling the Regional and Global Earth system

Publiceringsår

2014

Språk

Engelska

Publikation/Tidskrift/Serie

Tellus. Series B: Chemical and Physical Meteorology

Volym

66

Dokumenttyp

Artikel i tidskrift

Förlag

Taylor & Francis

Ämne

  • Geology

Nyckelord

  • stable water isotopes
  • modelling
  • moisture source
  • seasonality
  • previous
  • interglacial

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0280-6509