DF2021 chronology and Dome Fuji gas data (O2/N2, d15N, CH4) (0 - 207 kyr BP) ...

• Main Authors: Oyabu, Ikumi, Kawamura, Kenji, Buizert, Christo, Parrenin, Frederic, Orsi, Anais, Kitamura, Kyotaro, Aoki, Shuji, Nakazawa, Takakiyo
• Format: Dataset
• Language: English
• Published: Arctic Data archive System (ADS), Japan 2022
• Subjects: CLIMATE INDICATORS>PALEOCLIMATE INDICATORS>ICE CORE RECORDS>ICE CORE AIR BUBBLES; CLIMATE INDICATORS>PALEOCLIMATE INDICATORS>ICE CORE RECORDS>ISOTOPES>NITROGEN ISOTOPES; CLIMATE INDICATORS>PALEOCLIMATE INDICATORS>ICE CORE RECORDS>ISOTOPES>OXYGEN ISOTOPES; CLIMATE INDICATORS>PALEOCLIMATE INDICATORS>ICE CORE RECORDS>METHANE; CRYOSPHERE>GLACIERS/ICE SHEETS>ICE SHEETS; PALEOCLIMATE>ICE CORE RECORDS>ISOTOPES; CRYOSPHERE>GLACIERS/ICE SHEETS>AGE AT ICE-THICKNESS-NORMALIZED DEPTHS; Dome Fuji; ice core
• Online Access: https://dx.doi.org/10.17592/001.2022061303; https://ads.nipr.ac.jp/dataset/A20220613-003

Precise ice-core chronologies are essential for identifying the timing and duration of polar climatic changes as well as their phasing with the changes in other parts of the globe. However, existing ice-core chronologies beyond the last 60 kyr show relatively large disagreements with each other and with U-Th chronologies of speleothems. Here, we constructed new ice and gas age scales for the Dome Fuji (DF) core (DF2021) over the last 207 kyr by combining a Bayesian dating model and firn densification model, constrained by various types of chronological and glaciological information including new O2/N2 age markers, precise synchronization to other high-quality chronologies (volcanic, cosmogenic, and CH4 signals), and high-resolution d15N of N2 (reflecting past firn thickness). The new chronology is tightly constrained by synchronization to other well-dated records for the last 60 kyr, whereas it is independent from other chronologies for the older period. For the last 60 kyr, the DF2021 chronology agrees with ...