The Grid‐point Atmospheric Model of the IAP LASG version 3 (GAMIL3) has been developed by upgrading the horizontal resolution, methods of parallel computation, boundary layer scheme, aerosol parameterization, convective parameterization, stratocumulus cloud fraction scheme, land component, and coupler, as well as tuning some moist physical parameters with large uncertainties. Its performance is evaluated, and the results show significant improvements compared with the previous version, GAMIL2. The simulated performance of mean states is notably enhanced, including the energy budget terms at the top of the atmosphere (TOA) and surface, shortwave/longwave cloud radiative forcing (SWCF/LWCF), precipitation, zonal wind, low‐level temperature, 500‐hPa geopotential height, and snow cover fraction in the Northern Hemisphere. The characteristics of internal variability are captured well, such as the frequency band and active areas of quasi‐biweekly (QBW) oscillation, spectral power of convectively coupled equatorial waves (CCEWs), Madden‐Julian Oscillation (MJO) eastward propagation, and heat flux response to El Niño‐Southern Oscillation (ENSO), and these variabilities are generally strengthened in GAMIL3. In addition, the anthropogenic aerosol climate effects are weakened when using the forcings recommended by CMIP6.

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GAMIL3：模型说明和评估

通过升级水平分辨率，并行计算方法，边界层方案，气溶胶参数化，对流参数化，平流积云分数方案，土地成分和耦合器，开发了IAP LASG版本3（GAMIL3）的格点大气模型，以及调整一些不确定性较大的潮湿物理参数。对它的性能进行了评估，结果显示与以前的版本GAMIL2相比有明显的改进。平均状态的模拟性能得到显着增强，包括大气层（TOA）和地表顶部的能量预算项，短波/长波云辐射强迫（SWCF / LWCF），降水，纬向风，低层温度，500 －hPa的地势高度和北半球的积雪分数。内部变率的特征被很好地捕获，例如准双周（QBW）振荡的频带和活动区域，对流耦合赤道波（CCEW）的谱功率，马登-朱利安振荡（MJO）向东传播以及热通量对厄尔尼诺-南方涛动（ENSO）的响应，而这些差异在GAMIL3中通常得到加强。此外，使用CMIP6建议的强迫时，人为气溶胶对气候的影响会减弱。