Abstract
Compound Effect of Local and Remote Sea Surface Temperatures on the Unusual 2018 Western North Pacific Summer Monsoon
Highlights
The tropical western North Pacific (WNP) was characterized by active tropical cyclone (TC) activity in July and August (JA) 2018
The 500-hPa geopotential height (GHT500) exceeding the 95th percentile between 30°N and 40°N revealed a strong anticyclonic anomaly that manifested in the northward-shifted subtropical high in the WNP (Fig. 3d), whereas the region lower than the 30th percentile in the south reflected an enhanced monsoon trough
In the WNP during JA 2018, the anomalously northward-shifted Pacific subtropical high and the enhanced monsoon trough resulted in rainfall deficit and record-breaking heat in Northeast Asia and an anomalously active WNP summer monsoon and excessive rainfall in the South China Sea and Philippine
Summary
The tropical western North Pacific (WNP) was characterized by active tropical cyclone (TC) activity in July and August (JA) 2018. A strong northern circumpolar perturbation, characterized by zonally distributed positive 500-hPa geopotential height (GHT) anomalies between 30°N and 60°N circumglobally in the upper troposphere, was observed and associated with the widespread heat wave events in the northern extratropics, including Northeast Asia, North America, northern Europe, and the Arctic, from May to August 2018 (Chen, L. et al 2019; Kobayashi and Ishikawa 2019; Liu et al 2019; Vogel et al 2019; Ha et al 2020) These anomalous events in the WNP were accompanied by an unusually northward shift in the subtropical high and an enhanced monsoon trough (Wang et al 2019).
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