The Met Office Unified Model Global Atmosphere 7.0/7.1 and JULES Global Land 7.0 configurations
The Met Office Unified Model Global Atmosphere 7.0/7.1 and JULES Global Land 7.0 configurations
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DOI：
10.5194/gmd-12-1909-2019
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发表时间：
2019-05-14
影响因子：
5.1
通讯作者：
Zerroukat, Mohamed
中科院分区：
文献类型：
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作者：
Walters, David;Baran, Anthony J.;Zerroukat, Mohamed
我们描述了全球大气 7.0 和全球陆地 7.0 (GA7.0/GL7.0)、英国气象局统一模型 (UM) 的最新科学配置以及为跨天气和气候时间尺度使用而开发的英国联合陆地环境模拟器 (JULES) 陆地表面模型。 GA7.0和GL7.0包括增量开发和有针对性的改进，它们解决了先前配置中发现的四个关键错误：印度上空的过度降水偏差、热带对流层顶层（TTL）的温暖和潮湿偏差、平流方案中的能源不守恒以及南大洋上空的过度表面辐射偏差。它们还包括两个新的参数化，即英国化学和气溶胶 (UKCA) GLOMAP 模式（全球气溶胶过程模型）气溶胶方案和 JULES 多层雪方案，它们提高了模拟的保真度，并且需要在第六次耦合模型比对项目 (CMIP6) 之前纳入全球大气/全球陆地配置。此外，我们还描述了 GA7.1 分支 配置，可减少 GA7.0 中过度负的人为气溶胶有效辐射强迫 (ERF)，同时保持当今气候的模拟质量。 GA7.1/GL7.0 将构成向 CMIP6 提交的 HadGEM3-GC3.1 和 UKESM1 气候模型中的物理大气/陆地部分。
We describe Global Atmosphere 7.0 and Global Land 7.0 (GA7.0/GL7.0), the latest science configurations of the Met Office Unified Model (UM) and the Joint UK Land Environment Simulator (JULES) land surface model developed for use across weather and climate timescales. GA7.0 and GL7.0 include incremental developments and targeted improvements that, between them, address four critical errors identified in previous configurations: excessive precipitation biases over India, warm and moist biases in the tropical tropopause layer (TTL), a source of energy non-conservation in the advection scheme and excessive surface radiation biases over the Southern Ocean. They also include two new parametrisations, namely the UK Chemistry and Aerosol (UKCA) GLOMAP-mode (Global Model of Aerosol Processes) aerosol scheme and the JULES multi-layer snow scheme, which improve the fidelity of the simulation and were required for inclusion in the Global Atmosphere/Global Land configurations ahead of the 6th Coupled Model Intercomparison Project (CMIP6).In addition, we describe the GA7.1 branch configuration, which reduces an overly negative anthropogenic aerosol effective radiative forcing (ERF) in GA7.0 whilst maintaining the quality of simulations of the present-day climate. GA7.1/GL7.0 will form the physical atmosphere/land component in the HadGEM3-GC3.1 and UKESM1 climate model submissions to the CMIP6.