Why super sandstorm 2021 in North China?

Area of Science:

• Atmospheric Science
• Environmental Science
• Climatology

Background:

• North China experienced severe sandstorms in spring 2021, the first in over a decade.
• The dust source region in Mongolia faced extreme winter temperature fluctuations, leading to land degradation.

Purpose of the Study:

• Investigate the causes of the severe 2021 spring sandstorms in North China.
• Identify the climatic factors contributing to the dust storms and their intensity.

Main Methods:

• Analyzed meteorological data and climate anomalies in the dust source region.
• Utilized large-ensemble Coupled Model Intercomparison Project Phase 6 (CMIP6) simulations.
• Compared model results with reanalysis data.

Main Results:

• Dry soil and sparse vegetation in Mongolia, caused by winter climate anomalies, created favorable conditions for dust transport.
• A powerful Mongolian cyclone effectively transported large amounts of sand particles.
• Teleconnections, including sea ice shifts and sea surface temperature anomalies in the Pacific and Atlantic, influenced the regional climate anomalies.

Conclusions:

• A combination of large-scale climate variabilities and synoptic disturbances drove the strongest spring sandstorm in North China in the last decade.
• Understanding these complex interactions is crucial for predicting and mitigating future sandstorm events.