DOI: 10.5194/cp-13-379-2017
Scopus记录号: 2-s2.0-85018469214
论文题名: Development and evaluation of a system of proxy data assimilation for paleoclimate reconstruction
作者: Okazaki A. ; Yoshimura K.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2017
卷: 13, 期: 4 起始页码: 379
结束页码: 393
语种: 英语
Scopus关键词: data assimilation
; experimental design
; feasibility study
; general circulation model
; isotopic analysis
; paleoclimate
; precipitation (climatology)
; proxy climate record
; reconstruction
; temperature
; Atlantic Ocean
; Indian Ocean
; Pacific Ocean
; Pacific Ocean (East)
; Anthozoa
英文摘要: Data assimilation (DA) has been successfully applied in the field of paleoclimatology to reconstruct past climate. However, data reconstructed from proxies have been assimilated, as opposed to the actual proxy values. This prevented full utilization of the information recorded in the proxies. This study examined the feasibility of proxy DA for paleoclimate reconstruction. Isotopic proxies (δ18O in ice cores, corals, and tree-ring cellulose) were assimilated into models: an isotope-enabled general circulation model (GCM) and forward proxy models, using offline data assimilation. First, we examined the feasibility using an observation system simulation experiment (OSSE). The analysis showed a significant improvement compared with the first guess in the reproducibility of isotope ratios in the proxies, as well as the temperature and precipitation fields, when only the isotopic information was assimilated. The reconstruction skill for temperature and precipitation was especially high at low latitudes. This is due to the fact that isotopic proxies are strongly influenced by temperature and/or precipitation at low latitudes, which, in turn, are modulated by the El Niño-Southern Oscillation (ENSO) on interannual timescales. Subsequently, the proxy DA was conducted with real proxy data. The reconstruction skill was decreased compared to the OSSE. In particular, the decrease was significant over the Indian Ocean, eastern Pacific, and the Atlantic Ocean where the reproducibility of the proxy model was lower. By changing the experimental design in a stepwise manner, the decreased skill was suggested to be attributable to the misrepresentation of the atmospheric and proxy models and/or the quality of the observations. Although there remains a lot to improve proxy DA, the result adequately showed that proxy DA is feasible enough to reconstruct past climate. © Author(s) 2017. 资助项目: JSPS, Japan Society for the Promotion of Science
; JSPS, Japan Society for the Promotion of Science
; JSPS, Japan Society for the Promotion of Science
; JSPS, Japan Society for the Promotion of Science
; JST, Japan Science and Technology Agency
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48927
Appears in Collections: 气候变化与战略
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Recommended Citation:
Okazaki A.,Yoshimura K.. Development and evaluation of a system of proxy data assimilation for paleoclimate reconstruction[J]. Climate of the Past,2017-01-01,13(4)