DOI: 10.5194/cp-9-2789-2013
Scopus记录号: 2-s2.0-84891348299
论文题名: High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core
作者: Schüpbach S. ; Federer U. ; Kaufmann P.R. ; Albani S. ; Barbante C. ; Stocker T.F. ; Fischer H.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 6 起始页码: 2789
结束页码: 2807
语种: 英语
Scopus关键词: calcium
; carbon dioxide
; climate variation
; dust
; Holocene
; ice core
; ice cover
; interglacial
; Last Glacial Maximum
; late glacial
; paleoceanography
; paleoclimate
; resolution
; sea ice
; sea salt
; sodium
; Antarctica
; East Antarctica
; Queen Maud Land
; South America
; Southern Ocean
; Talos Dome
英文摘要: In this study we report on new non-sea salt calcium (nssCa2+, mineral dust proxy) and sea salt sodium (ssNa+, sea ice proxy) records along the East Antarctic Talos Dome deep ice core in centennial resolution reaching back 150 thousand years (ka) before present. During glacial conditions nssCa2+ fluxes in Talos Dome are strongly related to temperature as has been observed before in other deep Antarctic ice core records, and has been associated with synchronous changes in the main source region (southern South America) during climate variations in the last glacial. However, during warmer climate conditions Talos Dome mineral dust input is clearly elevated compared to other records mainly due to the contribution of additional local dust sources in the Ross Sea area. Based on a simple transport model, we compare nssCa 2+ fluxes of different East Antarctic ice cores. From this multi-site comparison we conclude that changes in transport efficiency or atmospheric lifetime of dust particles do have a minor effect compared to source strength changes on the large-scale concentration changes observed in Antarctic ice cores during climate variations of the past 150 ka. Our transport model applied on ice core data is further validated by climate model data. The availability of multiple East Antarctic nssCa2+ records also allows for a revision of a former estimate on the atmospheric CO2 sensitivity to reduced dust induced iron fertilisation in the Southern Ocean during the transition from the Last Glacial Maximum to the Holocene (T1). While a former estimate based on the EPICA Dome C (EDC) record only suggested 20 ppm, we find that reduced dust induced iron fertilisation in the Southern Ocean may be responsible for up to 40 ppm of the total atmospheric CO2 increase during T1. During the last interglacial, ssNa+ levels of EDC and EPICA Dronning Maud Land (EDML) are only half of the Holocene levels, in line with higher temperatures during that period, indicating much reduced sea ice extent in the Atlantic as well as the Indian Ocean sector of the Southern Ocean. In contrast, Holocene ssNa+ flux in Talos Dome is about the same as during the last interglacial, indicating that there was similar ice cover present in the Ross Sea area during MIS 5.5 as during the Holocene. © 2013 Author(s). 资助项目: SNSF, Swiss National Science Foundation
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49334
Appears in Collections: 气候变化与战略
There are no files associated with this item.
Recommended Citation:
Schüpbach S.,Federer U.,Kaufmann P.R.,et al. High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core[J]. Climate of the Past,2013-01-01,9(6)