DOI: 10.5194/cp-9-1029-2013
Scopus记录号: 2-s2.0-84878002316
论文题名: Spatial gradients of temperature, accumulation and δ18O- ice in Greenland over a series of Dansgaard-Oeschger events
作者: Guillevic M. ; Bazin L. ; Landais A. ; Kindler P. ; Orsi A. ; Masson-Delmotte V. ; Blunier T. ; Buchardt S.L. ; Capron E. ; Leuenberger M. ; Martinerie P. ; Prié F. ; Vinther B.M.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 3 起始页码: 1029
结束页码: 1051
语种: 英语
Scopus关键词: climate modeling
; Dansgaard-Oeschger cycle
; firn
; flow modeling
; ice core
; ice flow
; interstadial
; oxygen isotope
; precipitation (climatology)
; sea ice
; seasonality
; snow accumulation
; spatial variation
; stable isotope
; temperature gradient
; Arctic
; Arctic Ocean
; Greenland
; Norwegian Sea
英文摘要: Air and water stable isotope measurements from four Greenland deep ice cores (GRIP, GISP2, NGRIP and NEEM) are investigated over a series of Dansgaard- Oeschger events (DO 8, 9 and 10), which are representative of glacial millennial scale variability. Combined with firn modeling, air isotope data allow us to quantify abrupt temperature increases for each drill site (1σ = 0.6 °C for NEEM, GRIP and GISP2, 1.5 °C for NGRIP). Our data show that the magnitude of stadial-interstadial temperature increase is up to 2 °C larger in central and North Greenland than in northwest Greenland: i.e., for DO 8, a magnitude of +8.8 °C is inferred, which is significantly smaller than the +11.1 °C inferred at GISP2. The same spatial pattern is seen for accumulation increases. This pattern is coherent with climate simulations in response to reduced sea-ice extent in the Nordic seas. The temporal water isotope (δ18O)-temperature relationship varies between 0.3 and 0.6 (±0.08)°C-1 and is systematically larger at NEEM, possibly due to limited changes in precipitation seasonality compared to GISP2, GRIP or NGRIP. The gas age-ice age difference of warming events represented in water and air isotopes can only be modeled when assuming a 26% (NGRIP) to 40% (GRIP) lower accumulation than that derived from a Dansgaard-Johnsen ice flow model. © Author(s) 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49463
Appears in Collections: 气候变化与战略
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Recommended Citation:
Guillevic M.,Bazin L.,Landais A.,et al. Spatial gradients of temperature, accumulation and δ18O- ice in Greenland over a series of Dansgaard-Oeschger events[J]. Climate of the Past,2013-01-01,9(3)