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DTSTAMP:20210916T132528Z
LOCATION:Jean Calvin
DTSTART;TZID=Europe/Stockholm:20210706T110000
DTEND;TZID=Europe/Stockholm:20210706T130000
UID:submissions.pasc-conference.org_PASC21_sess109@linklings.com
SUMMARY:Towards Kilometer-Scale Global Storm-Resolving Weather and Climate
  Simulations, Part I
DESCRIPTION:Minisymposium\n\nThe predictive skill of weather and climate m
 odels has significantly improved over the past few decades, thanks to a hu
 ge increase in resolution facilitated by increased supercomputing capacity
 . A million-fold increase in computational power has allowed the resolutio
 n of operational global weather models to increase from 500 km to 10 km si
 nce 1980, for example. Further increases towards 1 km resolution would del
 iver significant improvements in the skill of weather and climate simulati
 ons. However, these simulations are still not viable for operational predi
 ctions due to the vast increase in computational cost. The computational s
 peed of global kilometer-scale simulations on today’s supercomputers is be
 low a practical level by at least two orders of magnitude. Furthermore, ta
 king advantage of future exascale supercomputers with heterogeneous archit
 ectures will require a substantial rethink of traditional coding paradigms
 .\nThis two-part minisymposium will bring together researchers on global k
 ilometer-scale atmosphere and ocean models from around the world. Speakers
  will discuss both the scientific and computational challenges of 1 km res
 olution. They will present the state-of-the-art of their respective simula
 tion systems and their roadmaps for the future. The challenge of kilometer
 -scale global simulations can be met, but only by the synthesis of ideas a
 cross Earth-System science and supercomputing.\n\nThe Quasi-Biennial Oscil
 lation – from the km-Scale of Deep Convection to a Global Scale Wind Oscil
 lation in the Stratosphere\n\nGiorgetta\n\nThe quasi-biennial oscillation 
 is observed in the zonal wind in the equatorial stratosphere where alterna
 tively westerly and easterly winds are generated in the upper stratosphere
 , then propagate downwards until the tropopause is reached. A full cycle l
 asts a bit more than 2 years. These global scal...\n\n--------------------
 -\nIs a 1Km Global Model Possible? Challenges for LFRic, Perspectives from
  the UM\n\nMaynard\n\nThe scale of parallelism required to exploit Exascal
 e computing is extreme. Weather and Climate models have traditionally empl
 oyed data parallelism to exploit parallelism. Exascale computing represent
 s both a challenge and an opportunity. The high resolution necessary would
  bring obvious scientific ...\n\n---------------------\nKm-Resolution Clim
 ate Models: from Regional to Global Approaches\n\nSchär, Gruber\n\nCurrent
 ly major efforts are underway toward refining the horizontal resolution (o
 r grid spacing) of climate models to about 1 km, using both global and reg
 ional climate models (GCMs and RCMs). There is the well-founded hope that 
 this increase in resolution represents a major stride in climate modeli...
 \n\n---------------------\nExtremely High-Resolution Modeling on Unstructu
 red Meshes with FESOM2\n\nKoldunov, Sidorenko, Danilov\n\nUnstructured mes
 h global geophysical models becoming more mature, and already contributing
  to major intercomparison projects like CMIP6 and OMIP. We will use ocean 
 model FESOM2 as an example, to discuss advantages and challenges that come
 s with unstructured global models. In particular we will cover...\n\n\nDom
 ain: CS and Math, Climate and Weather, Physics
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