Yue Zhang

Fudan University

This study analyzes the response of East Asian surface air temperature (SAT) to the quasi-biennial oscillation (QBO) in boreal winter using the JRA-55 reanalysis dataset and the CAM6 model. East Asian SAT patterns in response to the boreal winter QBO vertical profile are derived from singular value decomposition (SVD) analysis. The leading mode of...

Under global warming, understanding the long-term variation in different types of heatwaves is vital for China’s preparedness against escalating heat stress. This study investigates dry and wet heatwave shifts in eastern China over recent decades. Spatial trend analysis displays pronounced warming in inland midlatitudes and the Yangtze River Valley...

In this study, we discuss the influence of the Southern Indian Ocean Dipole (SIOD) on the location variation of the Intertropical Convergence Zone (ITCZ) over the Indian Ocean and its possible reasons using observations and the Community Earth System Model version 1.0.4 (CESM1.0.4). The results indicate that positive SIOD (PSIOD) and negative SIOD...

China is significantly impacted by torrential rainfall induced by tropical cyclone (TC) activity particularly in South China (SC) and East China (EC). This study delineates the distinct TC activities associated with these regions over the western North Pacific (WNP). Our analysis reveals that in SC, positive TC rainfall is largely attributed to a s...

East Asian floods and droughts in summer show a typical dipole pattern with a north-south oscillation centered near 30°N, called the southern drought–northern flood (SDNF) pattern, which has caused significant economic losses and casualties in the past three decades. However, effective explanations and predictions are still challenging, making suit...

This work explores the modulation of the Pacific decadal oscillation (PDO) on the relationship between the occurrence position of rapid intensification (RI) events of tropical cyclones (TCs) over the western North Pacific (WNP) in boreal autumn and El Niño–Southern Oscillation (ENSO). From the warm to cold phase of the PDO, the occurrence position...

This study investigates the coupled variability of temperature and precipitation in eastern China during summer using empirical orthogonal function (EOF) analysis to better understand and mitigate simultaneous occurrences of extreme events, such as compound droughts and heat waves. Two dominant modes are identified: the first exhibits a strong warm...

The El Niño–Southern Oscillation (ENSO) plays a critical role in predicting the winter surface temperature over East Asia. Numerous studies have attempted to improve the seasonal forecasting skill in view of the combined effects of ENSO and oceanic–tropospheric factors. However, high uncertainty and notable challenges still exist in using the ENSO...

The impact of El Niño–Southern Oscillation (ENSO) on the winter stratospheric polar vortex intensity (PVI) is re-examined, using JRA-55 datasets and the CESM2 model. Our results show that the negative correlation between ENSO and PVI has weakened in recent decades and is no longer statistically significant after the mid-1990s. This weakening ENSO–P...

Droughts and associated near-surface temperature anomalies can be attributed to amplified vertical subsidence and anomalous anticyclonic circulations from dynamic perspectives. However, two open and interesting issues remain unknown: 1) whether hydrometeorological situations under droughts can be reproduced directly utilizing variability of atmosph...

Previous studies have revealed that extratropical forcing can lead to changes in the intertropical convergence zone (ITCZ). Based on reanalysis data from 1979 to 2019, this paper discusses the influence of the South Pacific Ocean Dipole (SPOD, a dominant mode between the subtropics and extratropics in the South Pacific) and its coordination with EN...

Southern China has experienced a discernible early-spring drying trend in recent decades. This drying trend is a direct result of a severe deficiency of water vapor, which is induced by local descent anomalies and strong anomalous northerlies from the northwestern Pacific. The predominant anomalous northerlies are directly associated with two anoma...

Southeast Australia (SEA) experienced a wet February as well as an extremely wet March accompanied by devastating floods during 2021. Regional water vapor balance analysis at different levels indicates the leading role of water vapor inflow through zonal boundaries during February, and the dominant contribution of water vapor input through meridion...

This study investigates the variation in available potential energy of stationary eddies in the mid-troposphere over the midlatitude Northern Hemisphere (30˚ to 60˚N) from 1950 to 2021, based on the ERA5 reanalysis and its preliminary back extension. The variation is attributed mainly to change in the wavenumber-1 eddy. It is also noted that potent...

Eastern China was extremely wet in summer 2020, which is found to be related to the potential delayed effects of the Indian Ocean Dipole (IOD). Additional knowledge is warranted to improve our understanding of detailed mechanisms of such an effect. In this study, we compared physical processes associated with delayed effects of the IOD and El Niño–...

This study examines changes in tropical cyclone (TC) rainfall and the associated contributing factors over China during 1960–2018. The dominant mode of TC rainfall decreases from south to north, with a maximum in Guangdong Province. The associated time series of principal components reveals clear interdecadal variation, and three change points can...

This study investigates seasonal precipitation variation over eastern China associated with Indian Ocean Dipole (IOD) forcing and emphasizes the distinction of such responses to preceding IOD events compared with responses to El Niño–Southern Oscillation (ENSO). Precipitation evolution patterns in response to the IOD from autumn to the ensuing summ...

The spatiotemporal variability of southwest China (SWC) spring (March–April–May) rainfall (SWCSR) during 1961–2017 is investigated using rainfall data from 75 meteorological stations over SWC in this study. It is found that (1) SWC can be divided into four subregions using the rotated empirical orthogonal function (REOF) method: southern Yunnan pro...

This study attempts to measure the spatial correlation length (SCL) of summer extreme heat stress in any location by using a characterized scale identification method. Daily datasets of multiple meteorological variables from 2,134 observation stations over eastern China during 1961–2010 were used. Three types of heat indexes (a total of seven index...

The complex interaction between the Indian Ocean Dipole (IOD) and El Niño-Southern Oscillation (ENSO) is further investigated in this study, with a focus on the impacts of the IOD on ENSO in the subsequent year (ENSO(+1)). The interaction between the IOD and the concurrent ENSO (ENSO(0)) can be summarized as follows: ENSO(0) can trigger and enhance...

Significant anomalous signals are found during the ensuing summer after the Indian Ocean Dipole (IOD) forcing mode dissipates over the tropical Indian Ocean. These signals manifest as increased summer precipitation over the Yangtze–Huaihe River (YHR) region associated with abnormal water vapor convergence contributed mainly by southerly water vapor...

In this study, long-term change in winter synoptic temperature variations in Southwest China and the northern Indochina Peninsula from 1979 to 2017 (39 years) is documented. A sharp increase in synoptic temperature variation is found after 2010, indicating stronger day-to-day temperature change in the last decade. The increasing variation is attrib...

This paper identifies the seasonal relationships between monsoon activities over South China (SC) in winter and summer, which can help improve seasonal predictability. A predefined unified monsoon index that can well represent monsoon characteristics in both winter and summer over SC is employed. A time series of this unified monsoon index in summe...

This study investigates the modulation of the southern Indian Ocean dipole (SIOD) upon the impacts of the El Niño–Southern Oscillation (ENSO) on Australian summer rainfall (ASR) on an inter‐annual timescale. First the SIOD is identified as an important factor influencing rainfall anomalies over northeastern Australia via a zonal vertical circulatio...