A fast version of LASG/IAP climate system model and its 1000-year control integration

• Published in: Advances in Atmospheric Sciences
• Main Authors: Zhou Tianjun, Wu Bo, Wen Xinyu, Li Lijuan, Wang Bin
• Other Authors: Zhou, TJ (reprint author), Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China., Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing 100029, Peoples R China., Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China., Peking Univ, Dept Atmospher Sci, Beijing 100871, Peoples R China.
• Format: Journal/Newspaper
• Language: English
• Published: 大气科学进展英文版 2008
• Subjects: fast ocean-atmosphere coupled model; low resolution; model evaluation; GENERAL-CIRCULATION MODEL; MERIDIONAL OVERTURNING CIRCULATION; ATLANTIC THERMOHALINE CIRCULATION; SURFACE AIR-TEMPERATURE; IAP/LASG GOALS MODEL; COUPLED MODEL; NORTH PACIFIC; OCEAN SIMULATION; TIBETAN PLATEAU; LOW-RESOLUTION; Pacific; Sea ice
• Online Access: https://hdl.handle.net/20.500.11897/248700; https://doi.org/10.1007/s00376-008-0655-7

A fast version of the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG)/Institute of Atmospheric Physics (IAP) climate system model is briefly documented. The fast coupled model employs a low resolution version of the atmospheric component Grid Atmospheric Model of IAP/LASG (GAMIL), with the other parts of the model, namely an oceanic component LASG/IAP Climate Ocean Model (LICOM), land component Common Land Model (CLM), and sea ice component from National Center for Atmospheric Research Community Climate System Model (NCAR CCSM2), as the same as in the standard version of LASG/IAP Flexible Global Ocean Atmosphere Land System model (FGOALS_g). The parameterizations of physical and dynamical processes of the atmospheric component in the fast version are identical to the standard version, although some parameter values are different. However, by virtue of reduced horizontal resolution and increased time-step of the most time-consuming atmospheric component, it runs faster by a factor of 3 and can serve as a useful tool for long-term and large-ensemble integrations. A 1000-year control simulation of the present-day climate has been completed without flux adjustments. The final 600 years of this simulation has virtually no trends in global mean sea surface temperatures and is recommended for internal variability studies. Several aspects of the control simulation's mean climate and variability are evaluated against the observational or reanalysis data. The strengths and weaknesses of the control simulation are evaluated. The mean atmospheric circulation is well simulated, except in high latitudes. The Asian-Australian monsoonal meridional cell shows realistic features, however, an artificial rainfall center is located to the eastern periphery of the Tibetan Plateau persists throughout the year. The mean bias of SST resembles that of the standard version, appearing as a "double ITCZ" (Inter-Tropical Convergence Zone) associated with a westward extension of the equatorial eastern Pacific cold tongue. The sea ice extent is acceptable but has a higher concentration. The strength of Atlantic meridional overturning is 27.5 Sv. Evidence from the 600-year simulation suggests a modulation of internal variability on ENSO frequency, since both regular and irregular oscillations of ENSO are found during the different time periods of the long-term simulation. Meteorology & Atmospheric Sciences SCI(E) 中国科技核心期刊(ISTIC) 中国科学引文数据库(CSCD) 27 ARTICLE 4 655-672 25