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Reduced El Nino variability in the mid-Pliocene according to the PlioMIP2 ensemble

文献类型：期刊论文

作者Oldeman, Arthur M.2; Baatsen, Michiel L. J.2; von Der Heydt, Anna S.2,3; Dijkstra, Henk A.2,3; Tindall, Julia C.4; Abe-Ouchi, Ayako5; Booth, Alice R.6; Brady, Esther C.7; Chan, Wing-Le5; Chandan, Deepak8
刊名CLIMATE OF THE PAST
出版日期2021-12-01
卷号17期号:6页码:2427-2450
ISSN号1814-9324
DOI10.5194/cp-17-2427-2021
英文摘要The mid-Pliocene warm period (3.264-3.025 Ma) is the most recent geological period during which atmospheric CO2 levels were similar to recent historical values (similar to 400 ppm). Several proxy reconstructions for the midPliocene show highly reduced zonal sea surface temperature (SST) gradients in the tropical Pacific Ocean, indicating an El Nino-like mean state. However, past modelling studies do not show these highly reduced gradients. Efforts to understand mid-Pliocene climate dynamics have led to the Pliocene Model Intercomparison Project (PlioMIP). Results from the first phase (PlioMIP1) showed clear El Nino variability (albeit significantly reduced) and did not show the greatly reduced time-mean zonal SST gradient suggested by some of the proxies. In this work, we study El Nino-Southern Oscillation (ENSO) variability in the PlioMIP2 ensemble, which consists of additional global coupled climate models and updated boundary conditions compared to PlioMIP1. We quantify ENSO amplitude, period, spatial structure and "flavour", as well as the tropical Pacific annual mean state in mid-Pliocene and pre-industrial simulations. Results show a reduced ENSO amplitude in the model-ensemble mean (-24 %) with respect to the pre-industrial, with 15 out of 17 individual models showing such a reduction. Furthermore, the spectral power of this variability considerably decreases in the 3-4-year band. The spatial structure of the dominant empirical orthogonal function shows no particular change in the patterns of tropical Pacific variability in the model-ensemble mean, compared to the pre-industrial. Although the timemean zonal SST gradient in the equatorial Pacific decreases for 14 out of 17 models (0.2 degrees C reduction in the ensemble mean), there does not seem to be a correlation with the decrease in ENSO amplitude. The models showing the most "El Nino-like" mean state changes show a similar ENSO amplitude to that in the pre-industrial reference, while models showing more "La Nina-like" mean state changes generally show a large reduction in ENSO variability. The PlioMIP2 results show a reasonable agreement with both time-mean proxies indicating a reduced zonal SST gradient and reconstructions indicating a reduced, or similar, ENSO variability.
WOS关键词SEA-SURFACE TEMPERATURE ; TROPICAL PACIFIC-OCEAN ; EXPERIMENTAL-DESIGN ; GLOBAL CLIMATE ; WARM PERIOD ; MODEL ; ENSO ; SIMULATIONS ; MECHANISMS ; CONSISTENT
资助项目Netherlands Earth System Science Centre (OCW)[024.002.001]
WOS研究方向Geology ; Meteorology & Atmospheric Sciences
语种英语
WOS记录号WOS:000724551100001
出版者COPERNICUS GESELLSCHAFT MBH
资助机构Netherlands Earth System Science Centre (OCW) ; Netherlands Earth System Science Centre (OCW) ; Netherlands Earth System Science Centre (OCW) ; Netherlands Earth System Science Centre (OCW) ; Netherlands Earth System Science Centre (OCW) ; Netherlands Earth System Science Centre (OCW) ; Netherlands Earth System Science Centre (OCW) ; Netherlands Earth System Science Centre (OCW)
源URL[http://ir.iggcas.ac.cn/handle/132A11/103888]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Oldeman, Arthur M.
作者单位1.Columbia Univ, CCSR GISS, New York, NY 10025 USA
2.Univ Utrecht, Inst Marine & Atmospher Res Utrecht IMAU, Dept Phys, NL-3584 CC Utrecht, Netherlands
3.Univ Utrecht, Ctr Complex Syst Sci, NL-3584 CE Utrecht, Netherlands
4.Univ Leeds, Sch Earth & Environm, Woodhouse Lane, Leeds LS2 9JT, W Yorkshire, England
5.Univ Tokyo, Atmosphere & Ocean Res Inst, Kashiwa, Chiba 2778564, Japan
6.Univ Southampton, Natl Oceanog Ctr, Sch Ocean & Earth Sci, Southampton, Hants, England
7.Natl Ctr Atmospher Res, Boulder, CO 80305 USA
8.Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada
9.CEA CNRS UVSQ Univ Paris Saclay, Lab Sci Climat & Environm, LSCE IPSL, F-91191 Gif Sur Yvette, France
10.Univ Connecticut, Coll Liberal Arts & Sci, Dept Geosci, Storrs, CT 06033 USA
推荐引用方式
GB/T 7714		 Oldeman, Arthur M.,Baatsen, Michiel L. J.,von Der Heydt, Anna S.,et al. Reduced El Nino variability in the mid-Pliocene according to the PlioMIP2 ensemble[J]. CLIMATE OF THE PAST,2021,17(6):2427-2450.
APA Oldeman, Arthur M..,Baatsen, Michiel L. J..,von Der Heydt, Anna S..,Dijkstra, Henk A..,Tindall, Julia C..,...&Williams, Charles J. R..(2021).Reduced El Nino variability in the mid-Pliocene according to the PlioMIP2 ensemble.CLIMATE OF THE PAST,17(6),2427-2450.
MLA Oldeman, Arthur M.,et al."Reduced El Nino variability in the mid-Pliocene according to the PlioMIP2 ensemble".CLIMATE OF THE PAST 17.6(2021):2427-2450.

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来源：地质与地球物理研究所

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