Observed and Projected Changes of Large-Scale Environments Conducive to Spring MCS Initiation Over the US Great Plains

Fengfei Song, L. Ruby Leung, Zhe Feng, Xingchao Chen, Qiu Yang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Mesoscale convective systems (MCSs) are frequent over the US Great Plains during spring. The link between large-scale environments and spring MCS initiation were well established. Here, historical and future changes of spring large-scale environments favorable for MCS initiation are investigated using an MCS tracking data set, ERA5 reanalysis, and 20 Coupled Model Intercomparison Project Phase 6 (CMIP6) models. The frequency of Great Plains low-level jet (GPLLJ)-related MCS environments is found to have increased by ∼41% from 1979 to 2019, consistent with the enhanced GPLLJ and more frequent MCSs. Comparing CMIP6 AMIP and historical experiments, we find that the observed GPLLJ strengthening and more frequent MCS environments are mainly due to the decadal sea-surface temperature variations rather than external forcings. Under a high emission scenario, the frequency of GPLLJ-related environments favorable for MCS initiation will increase by ~65% during 2015–2100, along with a stronger GPLLJ, suggesting more frequent MCSs over the US Great Plains in a warming world.

Original languageEnglish (US)
Article numbere2022GL098799
JournalGeophysical Research Letters
Volume49
Issue number15
DOIs
StatePublished - Aug 16 2022

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences

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