资源环境科技发展态势分析平台

Previous studies showed that Antarctic ozone could modulate the Hadley circulation (HC) and precipitation in the Southern Hemisphere. However, whether and how, if any, Arctic stratospheric ozone (ASO) modulates the northern HC and subtropical precipitation remains unclear. We found an out-of-phase relationship between the northern HC extent (HCE) and ASO during boreal spring on interannual timescales during 1979-2014. Decreased (increased) ASO tends to result in an equatorward (poleward) shift of HCE by +0.67 degrees (-0.45 degrees) latitude per one standard deviation of decreased (increased) ASO year. Observational analysis and model simulations show that increased ASO leads to an equatorward shift of HCE and subtropical moistening via weakened eddy momentum flux and decreased subtropical static stability, accompanied with negative eddy momentum flux divergence anomalies and northward meridional wind anomalies over the subtropics. Our results may help to understand the linkage between the Arctic and midlatitudes, especially important for the subtropical precipitation and hydrological cycle.