Abstract
The Tibetan Plateau and its surrounding mountains have an average elevation of 4,400 m and a glaciated area of \(\sim \)100,000 \(\hbox {km}^{2}\) giving it the name “Third Pole (TP) region”. The TP is the headwater of many major rivers in Asia that provide fresh water to hundreds of millions of people. Climate change is altering the energy and water cycle of the TP at a record pace but the future of this region is highly uncertain due to major challenges in simulating weather and climate processes in this complex area. The Convection-Permitting Third Pole (CPTP) project is a Coordinated Regional Downscaling Experiment (CORDEX) Flagship Pilot Study (FPS) that aims to revolutionize our understanding of climate change impacts on the TP through ensemble-based, kilometer-scale climate modeling. Here we present the experimental design and first results from multi-model, multi-physics ensemble simulations of three case studies. The five participating modeling systems show high performance across a range of meteorological situations and are close to having ”observational quality” in simulating precipitation and near-surface temperature. This is partly due to the large differences between observational datasets in this region, which are the leading source of uncertainty in model evaluations. However, a systematic cold bias above 2000 m exists in most modeling systems. Model physics sensitivity tests performed with the Weather Research and Forecasting (WRF) model show that planetary boundary layer (PBL) physics and microphysics contribute equally to model uncertainties. Additionally, larger domains result in better model performance. We conclude by describing high-priority research needs and the next steps in the CPTP project.
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Data availability
The datasets generated during and analysed during the current study are available from the corresponding author on reasonable request.
Notes
A list can be found here: https://cordex.org/experiment-guidelines/flagship-pilot-studies/.
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Acknowledgements
UIBK acknowledges PRACE for awarding them access to Piz Daint at the Swiss National Supercomputing Center (CSCS, Switzerland). They also acknowledge the Federal Office for Meteorology and Climatology MeteoSwiss, the Swiss National Supercomputing Centre (CSCS), and ETH Zürich for their contributions to the development of the GPU-accelerated version of COSMO. In addition, they acknowledge DKRZ for providing COSMO-ready ERA5 boundary data. We would like to acknowledge high-performance computing support from Cheyenne (doi:10.5065/D6RX99HX) provided by NCAR’s Computational and Information Systems Laboratory. The MPAS simulations were performed using computational resources provided by the National Energy Research Scientific Computing Center (NERSC), a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract DE-AC02-05CH11231. K.S. and R.L. were supported by the U.S. Department of Energy Office of Science Biological and Environmental Research as part of the Global and Regional Model Analysis program area. S.S acknowledges the Data Analyzer in JAMSTEC for the WRF simulations and is supported by JSPS KAKENHI Grant Number JP20K04095. The computations by the University of Gothenburg were enabled by resources provided by the Swedish National Infrastructure for Computing (SNIC) at the National Supercomputer Centre in Sweden (NSC) partially funded by the Swedish Research Council through grant agreement no. 2018-05973. XC acknowledges the high-performance computing support from the Texas Advanced Computing Center (TACC) and San Diego Supercomputer Center (SDSC). S.J. acknowledges the support provided for the RegCM4 simulations by the IITM Pratyush high performance computing facility. This is a contribution no 10 to CORDEX-FPS-CPTP.
Funding
UHH is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy—EXC 2037 ’CLICCS—Climate, Climatic Change, and Society’—Project Number: 390683824, contribution to the Center for Earth System Research and Sustainability (CEN) of Universität Hamburg. PKP is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)— TRR 301—Project-ID 428312742. SS and LL gratefully acknowledge the support of a Bjerknes Fast Track Initiative from the Norwegian Education Directorate and HPC support through NOTUR/NorStore projects NN9820K/NS9001K. NCAR is sponsored by the National Science Foundation under Cooperative Agreement 1852977. PNNL is operated for the Department of Energy by Battelle Memorial Institute under contract DE-AC05-76RL01830. UGOT is supported by TPE via the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA20060402) and Swedish MERGE. UHH also acknowledges the use of DKRZ resources granted by its Scientific Steering Committee under project ID numbers uc0977 & mh1212.
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All authors contributed to the study conception and design. The first draft of the manuscript was written by Andreas F. Prein and Nikolina Ban and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Prof. BA was added as an author during the revisions of this paper. Prof. Ahrens contributed to the creation of the GUF-ICON2.3.6 simulations and supported the writing of this manuscript.
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Prein, A.F., Ban, N., Ou, T. et al. Towards Ensemble-Based Kilometer-Scale Climate Simulations over the Third Pole Region. Clim Dyn 60, 4055–4081 (2023). https://doi.org/10.1007/s00382-022-06543-3
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DOI: https://doi.org/10.1007/s00382-022-06543-3