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Taiwan Earth System Model Version 1: description and evaluation of mean state
Ist Teil von
Geoscientific Model Development, 2020-09, Vol.13 (9), p.3887-3904
Ort / Verlag
Katlenburg-Lindau: Copernicus GmbH
Erscheinungsjahr
2020
Quelle
EZB Free E-Journals
Beschreibungen/Notizen
The Taiwan Earth System Model (TaiESM) version 1 is developed based on
Community Earth System Model version 1.2.2 of National Center for
Atmospheric Research. Several innovative physical and chemical
parameterizations, including trigger functions for deep convection, cloud
macrophysics, aerosol, and three-dimensional radiation–topography
interaction, as well as a one-dimensional mixed-layer model optional for the
atmosphere component, are incorporated. The precipitation variability, such
as diurnal cycle and propagation of convection systems, is improved in
TaiESM. TaiESM demonstrates good model stability in the 500-year
preindustrial simulation in terms of the net flux at the top of the model,
surface temperatures, and sea ice concentration. In the historical
simulation, although the warming before 1935 is weak, TaiESM captures
the increasing trend of temperature after 1950 well. The current climatology of
TaiESM during 1979–2005 is evaluated by observational and reanalysis
datasets. Cloud amounts are too large in TaiESM, but their cloud forcing is
only slightly weaker than observational data. The mean bias of the sea
surface temperature is almost 0, whereas the surface air temperatures
over land and sea ice regions exhibit cold biases. The overall performance
of TaiESM is above average among models in Coupled Model Intercomparison
Project phase 5, particularly in that the bias of precipitation is smallest.
However, several common discrepancies shared by most models still exist,
such as the double Intertropical Convergence Zone bias in precipitation and
warm bias over the Southern Ocean.