Performance of the medium and high horizontal resolution models from HighResMIP-CMIP6 in simulating synoptic-scale cyclones over South America

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10491459" target="_blank" >RIV/00216208:11320/25:10491459 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=nkioaCWtaC" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=nkioaCWtaC</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00382-024-07579-3" target="_blank" >10.1007/s00382-024-07579-3</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Performance of the medium and high horizontal resolution models from HighResMIP-CMIP6 in simulating synoptic-scale cyclones over South America

Popis výsledku v původním jazyce

The future behavior of synoptic-scale cyclones remains uncertain due to various factors; in terms of modeling it relies on the global climate models (GCMs) settings, such as their dynamical core, parameterizations, horizontal and vertical resolutions, etc. To cover one part of these examples, this study aims to understand how high (similar to 25/50 km) and medium (similar to 50/100 km) horizontal resolutions in HighResMIP-CMIP6 GCMs affect the climatology of cyclones over South America and southwestern South Atlantic Ocean. Present climate simulations of six GCMs are compared with CFSR and ERA5 reanalyses, the simulations reproduce the three main cyclogenetic regions near the eastern coast of South America very well. Nevertheless, high-resolution (HR) simulations slightly overestimate the frequency of cyclones compared to medium-resolution (MR) simulations. Models have smaller errors in simulating cyclone&apos;s intensity than lifecycle, since they overestimate the long-lived events. The centered composites reveal that synoptic patterns (mean sea level pressure, 10-m winds and precipitation) of the cyclones show more organized and stronger fields in the simulations than reanalyses, especially close to the cyclone&apos;s center. Mid-upper levels cyclogenesis mechanisms are well captured by simulations. While the differences between HR and MR composites are not visually pronounced, the Kling-Gupta efficiency (KGE) index indicates that HR performs better than MR in the representation of the cyclone spatial structures for almost all variables in all cyclogenetic regions. Although there are notable improvements in the HR simulations, synoptic-scale studies in South America using MR simulations (which are refined compared to most CMIP6 GCMs) can also be trustful.

Název v anglickém jazyce

Performance of the medium and high horizontal resolution models from HighResMIP-CMIP6 in simulating synoptic-scale cyclones over South America

Popis výsledku anglicky

The future behavior of synoptic-scale cyclones remains uncertain due to various factors; in terms of modeling it relies on the global climate models (GCMs) settings, such as their dynamical core, parameterizations, horizontal and vertical resolutions, etc. To cover one part of these examples, this study aims to understand how high (similar to 25/50 km) and medium (similar to 50/100 km) horizontal resolutions in HighResMIP-CMIP6 GCMs affect the climatology of cyclones over South America and southwestern South Atlantic Ocean. Present climate simulations of six GCMs are compared with CFSR and ERA5 reanalyses, the simulations reproduce the three main cyclogenetic regions near the eastern coast of South America very well. Nevertheless, high-resolution (HR) simulations slightly overestimate the frequency of cyclones compared to medium-resolution (MR) simulations. Models have smaller errors in simulating cyclone&apos;s intensity than lifecycle, since they overestimate the long-lived events. The centered composites reveal that synoptic patterns (mean sea level pressure, 10-m winds and precipitation) of the cyclones show more organized and stronger fields in the simulations than reanalyses, especially close to the cyclone&apos;s center. Mid-upper levels cyclogenesis mechanisms are well captured by simulations. While the differences between HR and MR composites are not visually pronounced, the Kling-Gupta efficiency (KGE) index indicates that HR performs better than MR in the representation of the cyclone spatial structures for almost all variables in all cyclogenetic regions. Although there are notable improvements in the HR simulations, synoptic-scale studies in South America using MR simulations (which are refined compared to most CMIP6 GCMs) can also be trustful.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10509 - Meteorology and atmospheric sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Climate Dynamics

ISSN

0930-7575

e-ISSN

1432-0894

Svazek periodika

63

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

23

Strana od-do

83

Kód UT WoS článku

001396257000001

EID výsledku v databázi Scopus

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