Lin et al. (2026) Is the recently enhanced mesoscale convective systems in East Asia due to global warming or decadal variability?

⚠️ Warning: This summary was generated from the abstract only, as the full text was not available.

Identification

• Journal: Environmental Research Letters
• Year: 2026
• Date: 2026-03-10
• Authors: Zhongxi Lin, Bao Wang, Lanqiang Bai, Chuanfeng Zhao, Ji Nie
• DOI: 10.1088/1748-9326/ae4fe6

Research Groups

Not specified in abstract.

Short Summary

This study investigates the drivers of increased mesoscale convective system (MCS) precipitation in the Yangtze River Basin, finding that decadal variability, primarily through increased MCS frequency, is the main cause, with anthropogenic warming playing a smaller, reinforcing role.

Objective

• To distinguish the relative roles of anthropogenic warming and decadal variability in driving the observed increase in mesoscale convective system (MCS) precipitation in the Yangtze River Basin.

Study Configuration

• Spatial Scale: Yangtze River Basin (YRB)
• Temporal Scale: Since the beginning of the 21st century (for observed trend); decadal variability (for analysis period)

Methodology and Data

• Models used: High-resolution experiments using a pseudo global warming approach; CMIP6 piControl simulations
• Data sources: Observational data (implied by "observed pattern" and "observed increase"); CMIP6 model output

Main Results

• Mesoscale convective system (MCS) precipitation in the Yangtze River Basin (YRB) has increased by approximately 25% per decade since the beginning of the 21st century.
• The increasing trend of MCS precipitation does not necessitate a warming trend.
• Increased MCS frequency, largely independent of warming, accounts for most of the precipitation increase.
• MCS rain rate intensifies only under warming scenarios, providing a slight reinforcement to the MCS frequency contribution.
• Atmospheric circulation trends resembling observed patterns, which drive increases in MCS precipitation, frequently occur in internal-forcing-only (piControl) CMIP6 scenarios.
• The observed circulation trends in recent decades are likely manifestations of decadal variability.
• Overall, the observed increase in MCS precipitation in the YRB is mainly driven by a circulation trend likely arising from decadal variability, with global warming providing a smaller, overlying contribution.

Contributions

• Quantifies the relative contributions of anthropogenic warming and decadal variability to the observed increase in MCS precipitation in the Yangtze River Basin.
• Identifies increased MCS frequency, driven by decadal variability in atmospheric circulation, as the primary mechanism for the precipitation increase.
• Demonstrates that the observed MCS precipitation trend does not solely depend on a warming trend.
• Utilizes a pseudo global warming approach and CMIP6 piControl analysis to disentangle drivers.

Funding

Not specified in abstract.

Citation

@article{Lin2026Is,
  author = {Lin, Zhongxi and Wang, Bao and Bai, Lanqiang and Zhao, Chuanfeng and Nie, Ji},
  title = {Is the recently enhanced mesoscale convective systems in East Asia due to global warming or decadal variability?},
  journal = {Environmental Research Letters},
  year = {2026},
  doi = {10.1088/1748-9326/ae4fe6},
  url = {https://doi.org/10.1088/1748-9326/ae4fe6}
}