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Research Highlight

Major Modes of Short-Term Climate Variability in the Newly Developed NUIST Earth System Model (NESM)

ByCAO Jian, Bin WANG, etcMarch 08,2016
Major Modes of Short-Term Climate Variability in the Newly Developed NUIST Earth System Model (NESM)
Major Modes of Short-Term Climate Variability in the Newly Developed NUIST Earth System Model (NESM)

CAO Jian 1,2,3, Bin WANG1,2,3,4, Baoqiang XIANG∗5, Juan LI3, WU Tianjie1,2,3,Xiouhua FU1,2,3, WU Liguang1,2, and MIN Jinzhong1,2
1Earth System Modeling Center, Nanjing University of Information Science and Technology, Nanjing 210044
2Key Laboratory of Meteorological Disaster of Ministry of Education,
Nanjing University of Information Science and Technology, Nanjing 210044
3International Pacific Research Center, University of Hawaii at Manoa, Honolulu, HI 96822, USA
4Department of Atmospheric Sciences, University of Hawaii at Manoa, Honolulu, HI 96822, USA
5NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ 08540,
and University Corporation for Atmospheric Research, Boulder, CO 80307, USA
 
(Received 17 September 2014; revised 10 December 2014; accepted 10 December 2014)

ABSTRACT
 
A coupled earth system model (ESM) has been developed at the Nanjing University of Information Science and Technology (NUIST) by using version 5.3 of the European Centre Hamburg Model (ECHAM), version 3.4 of the Nucleus for European Modelling of the Ocean (NEMO), and version 4.1 of the Los Alamos sea ice model (CICE). The model is referred to as NUIST ESM1 (NESM1). Comprehensive and quantitative metrics are used to assess the model’s major modes of climate variability most relevant to subseasonal-to-interannual climate prediction. The model’s assessment is placed in a multi-model framework. The model yields a realistic annual mean and annual cycle of equatorial SST, and a reasonably realistic precipitation climatology, but has difficulty in capturing the spring–fall asymmetry and monsoon precipitation domains. The ENSO mode is reproduced well with respect to its spatial structure, power spectrum, phase locking to the annual cycle, and spatial structures of the central Pacific (CP)-ENSO and eastern Pacific (EP)-ENSO; however, the equatorial SST variability, biennial component of ENSO, and the amplitude of CP-ENSO are overestimated. The model captures realistic intraseasonal variability patterns, the vertical-zonal structures of the first two leading predictable modes of Madden–Julian Oscillation (MJO), and its eastward propagation; but the simulated MJO speed is significantly slower than observed. Compared with the T42 version, the high resolution version (T159) demonstrates improved simulation with respect to the climatology, interannual variance, monsoon–ENSO lead–lag correlation, spatial structures of the leading mode of the Asian–Australian monsoon rainfall variability, and the eastward propagation of the MJO.
 
Key words: coupled climate model, earth system model, climate variability
 
Citation: Cao, J., and Coauthors, 2015: Major modes of short-term climate variability in the newly developed NUIST Earth System Model (NESM). Adv. Atmos. Sci., 32(5), 585–600, doi: 10.1007/s00376-014-4200-6.