Work

Stratospheric Quasi‐Biennial Oscillation Modulates the Impact of Boreal Summer Intraseasonal Oscillation on Rainfall Extremes in the Yangtze–Huaihe River Basin

Year: 2024

Type: article

Abstract: The impact of the boreal summer intraseasonal oscillation (BSISO) on rainfall anomalies in the Yangtze–Huaihe River Basin (YHRB) was found to be modulated by the stratospheric quasi‐biennial oscillation (QBO), which is reasonable for the close associations between the QBO and summer extreme precipitation in the YHRB. It was found that the extreme precipitation preferentially occurred in the YHRB during the easterly phase of the QBO (EQBO) compared to the westerly phase of the QBO (WQBO). This was primarily because the BSISO was more prone to cause rainfall extremes in the YHRB during the EQBO summers than during the WQBO summers. The EQBO can induce the background stratospheric easterly wind to arch downward into the troposphere, which enhanced the BSISO‐associated moisture transport and moisture convergence and thus resulted in stronger rainfall extremes in the YHRB.

Source: Geophysical Research Letters

DOI: 10.1029/2024gl110922

Authors: Fang Zhou, Yuqi Wu, Tingting Han, Zhicong Yin

Institution: Nanjing University of Information Science and Technology

Language: English

Topic: Climate variability and models

Subfield: Global and Planetary Change

Field: Environmental Science

Domain: Physical Sciences

SDG: Climate action

Open Access status: gold

Estimated APC paid: $2,900