In:
Geoscientific Model Development, Copernicus GmbH, Vol. 12, No. 5 ( 2019-05-14), p. 1909-1963
Abstract:
Abstract. 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.
Type of Medium:
Online Resource
ISSN:
1991-9603
DOI:
10.5194/gmd-12-1909-2019
DOI:
10.5194/gmd-12-1909-2019-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2019
detail.hit.zdb_id:
2456725-5