Impact of Aerosol Forcing on East Asia Summer Monsoon Seasonal Cycle

By Trend News Line 2024-06-21 00:00:00.

Pacific Ocean, promoting the northward migration of the EASM. In the upper troposphere (Fig. 2h), the anomalous southwest wind in eastern China intensifies, demonstrating a closed cyclonic circulation over Shaanxi province. The horizontal convergence at 200 hPa triggers subsidence motion from the mid-to-upper troposphere, generating weak northerly winds at the surface over South China. The overall impact of aerosols in this phase results in a delay in the onset time of the EASM over the Yangtze-Huaihe River basin.

Transitioning to the PD3 phase (Fig. 2c, f, i), the surface temperature difference between land and sea remains relatively stable. Anomalous northerly winds at 850 hPa persist over North China and Northeast China, while southerly winds at 200 hPa intensify. The zonal wind at 200 hPa exhibits a cyclonic circulation pattern over Shaanxi province, indicative of anomalous subsidence motion in the mid-to-upper troposphere. The convergence of horizontal winds at 200 hPa leads to the weakening of the EASM, resulting in a delay in the onset time over North China and Northeast China.

In conclusion, the seasonal march of the East Asian Summer Monsoon (EASM) is influenced by anthropogenic aerosols, leading to delays in the onset time of the monsoon across different regions. The impact of aerosols on the EASM is evident in the atmospheric circulation patterns observed in the lower to upper troposphere during distinct phases of the monsoon progression. These findings shed light on the complex interactions between aerosols and the EASM, highlighting the need for further research to understand the implications of human activities on the regional climate systems.

Through the utilization of advanced simulation experiments and indices, scientists can unravel the intricate mechanisms underlying the seasonal progression of the EASM and its susceptibility to external forcings. By integrating observational data with model simulations, researchers can enhance our understanding of how anthropogenic activities shape the dynamics of the EASM and devise strategies to mitigate potential impacts on regional climate patterns.

As we delve deeper into the complexities of the seasonal march of the EASM, it becomes increasingly apparent that human activities play a significant role in modulating the onset time and intensity of the monsoon. By continuing to investigate the interactions between aerosols and the EASM, we can develop innovative solutions to address the challenges posed by climate change and ensure the sustainability of our planet’s ecosystems..

– aerosol forcing East Asia summer monsoon
– seasonal march East Asia summer monsoon.