This study investigated the influence of the stratospheric quasi-biennial oscillation (QBO) on the tropical easterly jet (TEJ), using the ERA5 and QBO series of Singapore and Freie Universität Berlin. Since the 1980s, the easterlies of the TEJ over the Maritime Continent are weaker during easterly QBO (EQBO) than westerly QBO. QBO influences TEJ by affecting convection on the east and west sides of the Maritime Continent. The climatological rising movement on the west side of the Maritime Continent can reach a higher altitude than that on the east side, which implies the convections on the west side are likely to be more effectively promoted by the reduced stability near the tropopause during EQBO. The zonal asymmetry in the stability near the tropopause is also a possible cause for QBO modulating convection. QBO has a significant influence on the Asian summer monsoon and tropical/subtropical precipitation through modulating the TEJ.

中文翻译：

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平流层准两年振荡对海洋大陆上空热带东风急流的影响

本研究使用新加坡和柏林自由大学的 ERA5 和 QBO 系列，调查了平流层准两年振荡 (QBO) 对热带东风急流 (TEJ) 的影响。自 1980 年代以来，海洋大陆上 TEJ 的东风在东风 QBO (EQBO) 期间比在西风 QBO (WQBO) 期间更弱。QBO 通过影响海洋大陆东西两侧的对流来影响 TEJ。海洋大陆西侧的气候上升运动可以达到比东侧更高的高度，这意味着西侧的对流可能更有效地受到EQBO期间对流层顶附近稳定性降低的促进。对流层顶附近稳定性的纬向不对称也是QBO调制对流的一个可能原因。