DOI: 10.1007/s00382-012-1488-8
Scopus记录号: 2-s2.0-84876841372
论文题名: Mid-Holocene and Last Glacial Maximum climate simulations with the IPSL model-part I: Comparing IPSL_CM5A to IPSL_CM4
作者: Kageyama M. ; Braconnot P. ; Bopp L. ; Caubel A. ; Foujols M.-A. ; Guilyardi E. ; Khodri M. ; Lloyd J. ; Lombard F. ; Mariotti V. ; Marti O. ; Roy T. ; Woillez M.-N.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-09-10 起始页码: 2447
结束页码: 2468
语种: 英语
英文关键词: IPSL climate model
; Last Glacial Maximum
; Mid-Holocene
; PMIP/CMIP
英文摘要: The climates of the mid-Holocene (MH), 6,000 years ago, and of the Last Glacial Maximum (LGM), 21,000 years ago, have extensively been simulated, in particular in the framework of the Palaeoclimate Modelling Intercomparion Project. These periods are well documented by paleo-records, which can be used for evaluating model results for climates different from the present one. Here, we present new simulations of the MH and the LGM climates obtained with the IPSL_CM5A model and compare them to our previous results obtained with the IPSL_CM4 model. Compared to IPSL_CM4, IPSL_CM5A includes two new features: the interactive representation of the plant phenology and marine biogeochemistry. But one of the most important differences between these models is the latitudinal resolution and vertical domain of their atmospheric component, which have been improved in IPSL_CM5A and results in a better representation of the mid-latitude jet-streams. The Asian monsoon's representation is also substantially improved. The global average mean annual temperature simulated for the pre-industrial (PI) period is colder in IPSL_CM5A than in IPSL_CM4 but their climate sensitivity to a CO2 doubling is similar. Here we show that these differences in the simulated PI climate have an impact on the simulated MH and LGM climatic anomalies. The larger cooling response to LGM boundary conditions in IPSL_CM5A appears to be mainly due to differences between the PMIP3 and PMIP2 boundary conditions, as shown by a short wave radiative forcing/feedback analysis based on a simplified perturbation method. It is found that the sensitivity computed from the LGM climate is lower than that computed from 2 × CO2 simulations, confirming previous studies based on different models. For the MH, the Asian monsoon, stronger in the IPSL_CM5A PI simulation, is also more sensitive to the insolation changes. The African monsoon is also further amplified in IPSL_CM5A due to the impact of the interactive phenology. Finally the changes in variability for both models and for MH and LGM are presented taking the example of the El-Niño Southern Oscillation (ENSO), which is very different in the PI simulations. ENSO variability is damped in both model versions at the MH, whereas inconsistent responses are found between the two versions for the LGM. Part 2 of this paper examines whether these differences between IPSL_CM4 and IPSL_CM5A can be distinguished when comparing those results to palaeo-climatic reconstructions and investigates new approaches for model-data comparisons made possible by the inclusion of new components in IPSL_CM5A. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55065
Appears in Collections: 过去全球变化的重建
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作者单位: LSCE/IPSL, UMR CEA-CNRS-UVSQ 8212, CE Saclay, L'Orme des Merisiers, Bâtiment 701, 91191 Gif-sur-Yvette Cedex, France; Institut Pierre-Simon Laplace, Case 101, UPMC, 4 place Jussieu, 75252 Paris Cedex 5, France; LOCEAN/IPSL, Boîte 100-4, place Jussieu, 75252 Paris Cedex 05, France; Observatoire Océanographique de Villefranche, Université Pierre et Marie Curie (Paris 6), BP 28, 06234 Villefranche-sur-Mer, France; National Centre for Atmospheric Science (NCAS), University of Reading, Reading, United Kingdom
Recommended Citation:
Kageyama M.,Braconnot P.,Bopp L.,et al. Mid-Holocene and Last Glacial Maximum climate simulations with the IPSL model-part I: Comparing IPSL_CM5A to IPSL_CM4[J]. Climate Dynamics,2013-01-01,40(2017-09-10)