Vis enkel innførsel

dc.contributor.authorServettaz, Aymeric P. M.
dc.contributor.authorOrsi, Anaïs
dc.contributor.authorCurran, Mark A. J.
dc.contributor.authorMoy, Andrew D.
dc.contributor.authorLandais, Amaelle
dc.contributor.authorAgosta, Cécile
dc.contributor.authorWinton, V. Holly L.
dc.contributor.authorTouzeau, Alexandra
dc.contributor.authorMcConnell, Joseph R.
dc.contributor.authorWerner, Martin
dc.contributor.authorBaroni, Mélanie
dc.date.accessioned2021-06-24T11:07:25Z
dc.date.available2021-06-24T11:07:25Z
dc.date.created2020-12-14T11:44:20Z
dc.date.issued2020
dc.PublishedJournal of Geophysical Research (JGR): Space Physics. 2020, 125 (17), .
dc.identifier.issn2169-9380
dc.identifier.urihttps://hdl.handle.net/11250/2761109
dc.description.abstractUnderstanding climate proxy records that preserve physical characteristics of past climate is a prerequisite to reconstruct long-term climatic conditions. Water stable isotope ratios (δ18O) constitute a widely used proxy in ice cores to reconstruct temperature and climate. However, the original climate signal is altered between the formation of precipitation and the ice, especially in low-accumulation areas such as the East Antarctic Plateau. Atmospheric conditions under which the isotopic signal is acquired at Aurora Basin North (ABN), East Antarctica, are characterized with the regional atmospheric model Modèle Atmosphérique Régional (MAR). The model shows that 50% of the snow is accumulated in less than 24 days year−1. Snowfall occurs throughout the year and intensifies during winter, with 64% of total accumulation between April and September, leading to a cold bias of −0.86°C in temperatures above inversion compared to the annual mean of −29.7°C. Large snowfall events are associated with high-pressure systems forcing warm oceanic air masses toward the Antarctic interior, which causes a warm bias of +2.83°C. The temperature-δ18O relationship, assessed with the global atmospheric model ECHAM5-wiso, is primarily constrained by the winter variability, but the observed slope is valid year-round. Three snow δ18O records covering 2004–2014 indicate that the anomalies recorded in the ice core are attributable to the occurrence of warm winter storms bringing precipitation to ABN and support the interpretation of δ18O in this region as a marker of temperature changes related to large-scale atmospheric conditions, particularly blocking events and variations in the Southern Annular Mode.en_US
dc.language.isoengen_US
dc.publisherAGUen_US
dc.titleSnowfall and Water Stable Isotope Variability in East Antarctica Controlled by Warm Synoptic Eventsen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2020. American Geophysical Union. All Rights Reserved.en_US
dc.source.articlenumbere2020JD032863en_US
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.fulltextpostprint
cristin.qualitycode2
dc.identifier.doi10.1029/2020JD032863
dc.identifier.cristin1859454
dc.source.journalJournal of Geophysical Research (JGR): Space Physicsen_US
dc.source.40125
dc.source.1417
dc.identifier.citationJournal of Geophysical Research (JGR): Space Physics. 2020, 125(17), e2020JD032863en_US
dc.source.volume125en_US
dc.source.issue17en_US


Tilhørende fil(er)

Thumbnail
Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel