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Influence of August Asian–Pacific Oscillation on September Precipitation in Northern Xinjiang

Guardado en:
Udgivet i:Atmosphere vol. 16, no. 9 (2025), p. 1042-1057
Hovedforfatter: Zhu Yichu
Andre forfattere: Hua, Wei
Udgivet:
MDPI AG
Fag:
Asia
China
Northern Hemisphere
Datasets
Geopotential
Warm air
Arid zones
Atmospheric circulation
Air masses
Precipitation
Cyclonic circulation
Precipitation patterns
Influence
Geopotential height
Circulation patterns
Semiarid zones
Temperature
Atmospheric circulation anomalies
Circulation
Variables
Arid regions
Dynamic height
Anomalies
Semi arid areas
Climate
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Resumen:For arid and semi-arid regions like Xinjiang, analyzing the spatiotemporal patterns of September precipitation and their atmospheric circulation teleconnections is crucial for ecosystem preservation. This research examined how the August Asian–Pacific Oscillation (APO) influenced the September precipitation patterns in northern Xinjiang. The results show that the thermal anomalies resulting from the August APO exhibited persistence into September, triggering atmospheric circulation anomalies that ultimately affected the precipitation patterns in northern Xinjiang, with a notable negative correlation. The positive (negative) August APO phase corresponded to reduced (increased) mid-tropospheric geopotential heights over Asia and the Arabian Sea, significantly enhancing anomalous cyclonic (anticyclonic) circulation patterns in these regions. These circulation patterns induced anomalous northerlies (southerlies) over northern Xinjiang and the region from eastern Iran to the Persian Gulf, thereby reducing (increasing) the moisture transport from the Arabian Sea. Furthermore, the anomalous divergence (convergence) of cold/warm air masses and subsidence (ascent) motions exacerbated (enhanced) these effects, ultimately suppressing (enhancing) the September precipitation in northern Xinjiang.
ISSN:2073-4433
DOI:10.3390/atmos16091042
Fuente:Publicly Available Content Database