DOI: 10.5194/cp-9-1543-2013
Scopus记录号: 2-s2.0-84880202624
论文题名: Inter-annual tropical Pacific climate variability in an isotope-enabled CGCM: Implications for interpreting coral stable oxygen isotope records of ENSO
作者: Russon T. ; Tudhope A.W. ; Hegerl G.C. ; Collins M. ; Tindall J.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 4 起始页码: 1543
结束页码: 1557
语种: 英语
Scopus关键词: annual variation
; calibration
; climate forcing
; climate variation
; El Nino-Southern Oscillation
; general circulation model
; isotopic analysis
; salinity
; spatial analysis
; Pacific Ocean
英文摘要: Water isotope-enabled coupled atmosphere-ocean climate models allow for exploration of the relative contributions to coral stable oxygen isotope (δ18Ocoral) variability arising from sea surface temperature (SST) and the isotopic composition of seawater (δ 18Osw). The unforced behaviour of the isotope-enabled HadCM3 coupled general circulation model suggests that the extent to which inter-annual δ18Osw variability contributes to that in model δ18Ocoral is strongly spatially dependent, ranging from being negligible in the eastern equatorial Pacific to accounting for 50% of δ18Ocoral variance in parts of the western Pacific. In these latter cases, a significant component of the inter-annual δ18Osw variability is correlated to that in SST, meaning that local calibrations of the effective local δ18Ocoral-SST relationships are likely to be essential. Furthermore, the relationship between δ18O sw and SST can be non-linear, such that the model interpretation of central and western equatorial Pacific δ18Ocoral in the context of a linear dependence on SST alone leads to overestimation (by up to 20%) of the SST anomalies associated with large El Niño events. Intra-model evaluation of a salinity-based pseudo-coral approach shows that such an approach captures the first-order features of the model δ 18Osw behaviour. However, the utility of the pseudo-corals is limited by the extent of spatial variability seen within the modelled slopes of the temporal salinity-δ18Osw relationship. © Author(s) 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49455
Appears in Collections: 气候变化与战略
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Recommended Citation:
Russon T.,Tudhope A.W.,Hegerl G.C.,et al. Inter-annual tropical Pacific climate variability in an isotope-enabled CGCM: Implications for interpreting coral stable oxygen isotope records of ENSO[J]. Climate of the Past,2013-01-01,9(4)