Has the Problem of a Permanent El Nio been Resolved for the Mid-Pliocene?  

作　　者：ZHANG Zhong-Shi YAN Qing SU Jing-Zhi GAO Yong-Qi 

机构地区：[1]Bjerknes Centre for Climate Research, UniResearch, Bergen 5007, Norway [2]Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China [3]Chinese Academy of Meteorological Sciences, Beijing 100081, China [4]Nansen Environmental and Remote Sensing Center, Bergen 5006, Norway

出　　处：《Atmospheric and Oceanic Science Letters》2012年第6期445-448,共4页大气和海洋科学快报（英文版）

基　　金：supported by the National Basic Research Program of China(973 Program,Grant No.2010CB950102);the Strategic and Special Frontier Project of Science and Technology of the Chinese Academy of Sciences(Grant No. XDA05080803);the National Natural Science Foundation of China(Grant No.40902054)

摘　　要：The mid-Pliocene, the most recent warm geological period, is thought to be indicative of the fate of the Earth's climate under global warming. Earlier evidence has suggested that permanent El Nio-like conditions existed in the mid-Pliocene, though the concept of a permanent El Nio remains controversial. Here, the authors analyzed Nio 3.4 SST in pre-industrial and mid-Pliocene simulations with the low-resolution version of the Norwegian Earth System Model (NorESM-L). The simulated mid-Pliocene Nio3.4 SST, with a smaller standard deviation, indicated that a weaker ENSO existed in the mid-Pliocene relative to the pre-industrial experiment. Compared with earlier modeling studies, our simulations show that the problem of ENSO's standard deviations in the mid-Pliocene remains unresolved, although the mean and the period of ENSO in the mid-Pliocene have been resolved by earlier geological and modeling studies.The mid-Pliocene, the most recent warm geological period, is thought to be indicative of the fate of the Earth’s climate under global warming. Earlier evidence has suggested that permanent El Nio-like conditions existed in the mid-Pliocene, though the concept of a permanent El Nio remains controversial. Here, the authors analyzed Nio 3.4 SST in pre-industrial and mid-Pliocene simulations with the low-resolution version of the Norwegian Earth System Model （NorESM-L）. The simulated mid-Pliocene Nio3.4 SST, with a smaller standard deviation, indicated that a weaker ENSO existed in the mid-Pliocene relative to the pre-industrial experiment. Compared with earlier modeling studies, our simulations show that the problem of ENSO’s standard deviations in the mid-Pliocene remains unresolved, although the mean and the period of ENSO in the mid-Pliocene have been resolved by earlier geological and modeling studies.

关 键 词：mid-Pliocene ENSO permanent El Nio-like conditions 

分 类 号：P732.6[天文地球—海洋科学] P534.622