Article
Geosciences, Multidisciplinary
Meng Meng, Daoyi Gong
Summary: This study investigated the influence of winter North Atlantic sea surface temperature on spring Eurasian wildfire and found two possible pathways. Firstly, the anomalous SST pattern in winter can persist to spring, leading to high air-pressure anomaly over southeastern Siberia and enhancing aridity conditions and wildfire risk. Secondly, the negative snow cover anomalies during winter can result in negatively anomalous soil moisture, providing a favorable environment for wildfire activities.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Yinchen Zhang, X. San Liang
Summary: The study demonstrates the significant influence of the South China Sea on the Pacific-North American (PNA) teleconnection pattern through causal inference with information flow. It reveals a robust causal pattern within the South China Sea and shows that anomalies in the South China Sea sea surface temperature can trigger PNA-like responses. This suggests that the South China Sea effect should be considered when interpreting and predicting the PNA.
Article
Meteorology & Atmospheric Sciences
Yumi Cha, Jae Won Choi, Joong-Bae Ahn
Summary: This study conducted a correlation analysis between tropical cyclone genesis frequency (TCGF) in the western North Pacific (WNP) and heatwave days (HWD) in Korea during July and August for 1973-2018 and found a strong positive correlation between them. The study also found that during high TCGF years, there were strengthened anticyclonic and cyclonic circulations in the East Asia mid-latitude region and the WNP, respectively. Additionally, the local Hadley circulation was strengthened during high TCGF years. The wave activity flux from the North Atlantic was also found to be related to the situations in Korea and the WNP.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2022)
Article
Multidisciplinary Sciences
Zhongfang Liu, Camille Risi, Francis Codron, Xiaogang He, Christopher J. Poulsen, Zhongwang Wei, Dong Chen, Sha Li, Gabriel J. Bowen
Summary: Recent studies have shown that the western Arctic experiences the fastest sea-ice decline, with the Pacific North American pattern playing a crucial role in driving sea-ice variability and accelerating sea-ice loss.
NATURE COMMUNICATIONS
(2021)
Article
Meteorology & Atmospheric Sciences
Shizuo Liu, Qigang Wu, Yonghong Yao, Steve Schroeder, Lei Wang
Summary: Previous empirical studies have shown that autumn and winter Tibetan Plateau snow cover anomalies have significant influences on winter Pacific-North American and East Atlantic teleconnection patterns. This study further investigates the impacts of these anomalies on North Atlantic-Europe and Arctic climate. Results indicate that the hydrological effect of Tibetan Plateau snow water equivalent differs from the albedo effect of snow cover extent in snow-atmosphere teleconnections. Numerical experiments using observed snow anomalies as forcing in a coupled atmosphere-ocean general circulation model simulate a winter negative NAO/WA response. These results demonstrate the widespread impacts of Tibetan Plateau snow anomalies on the Northern Hemisphere.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Meteorology & Atmospheric Sciences
Sining Ling, Riyu Lu
Summary: The study revealed that tropical cyclones in the western North Pacific contribute significantly to the East Asia-Pacific teleconnection pattern during summer, enhancing various atmospheric anomalies in the region.
ADVANCES IN ATMOSPHERIC SCIENCES
(2022)
Article
Meteorology & Atmospheric Sciences
Zheng Chen, Bolan Gan, Fei Huang, Jianping Li, Lixin Wu, Lei Fan, Yina Diao
Summary: This study investigates the impact of the enhancing Pacific-North American teleconnection (PNA) on the intensity of the first mode of winter-time North Pacific sea surface temperature anomalies (SSTa) under global warming. The results suggest that the PNA has a significant effect on the intensity of the sea surface temperature anomalies. Future projections indicate that the intensity of the sea surface temperature anomalies will increase 2.2 times under the influence of the enhancing PNA.
Article
Environmental Sciences
Anran Zhuge, Benkui Tan
Summary: The ZNPO pattern is a newly identified teleconnection pattern that oscillates mass in the troposphere between the eastern and western North Pacific, affecting severe weather and hydroclimate events in North Pacific and North America during winter. It is primarily driven by baroclinic energy conversion and feedback forcing by transient eddies, acting as a major source of kinetic energy to maintain the pattern.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Ya Wang, Kaiming Hu, Gang Huang, Weichen Tao
Summary: The asymmetric impacts of El Nino and La Nina on the Pacific-North American teleconnection pattern are influenced by the varying tropical convective heating and discrepancy of the subtropical jet stream. This leads to the eastward (westward) shift of the STJ during El Nino (La Nina) years, ultimately contributing to the asymmetry of the teleconnection pattern.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Meteorology & Atmospheric Sciences
Shizuo Liu, Qigang Wu, Yonghong Yao, Steven R. Schroeder
Summary: Previous studies have found the influence of Tibetan Plateau (TP) snow-cover anomalies on the winter Pacific-North American (PNA) teleconnection. This study uses atmospheric and oceanic general circulation models to simulate the response to TP snow forcing and identify the role of atmosphere-ocean interactions. The results show that the interaction amplifies the PNA response to TP snow forcing through the formation of a horseshoe-like North Pacific sea surface temperature (SST) pattern and the strengthening of the Aleutian low.
JOURNAL OF CLIMATE
(2023)
Article
Geosciences, Multidisciplinary
Yi Liu, Ziguang Li, Xiaopei Lin, Jun-Chao Yang
Summary: The study suggests that under greenhouse warming, the connection between El Nino and the tropical North Atlantic will strengthen, leading to an increase in anomalous warming/cooling and related weather extremes in the future.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Meteorology & Atmospheric Sciences
Jinjie Song, Philip J. Klotzbach, Yihong Duan
Summary: This study investigates the influence of the Pacific-North American (PNA) pattern on the accumulated cyclone energy (ACE) of tropical cyclones (TCs) over the western North Pacific (WNP). The study finds a significant inverse relationship between ACE and the PNA index, with lower ACE observed when the PNA is positive, primarily due to a decrease in TC frequency. When examining the results spatially, lower ACE is observed over almost the entire WNP when the PNA index is positive.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2022)
Article
Meteorology & Atmospheric Sciences
Shangfeng Chen, Wen Chen, Renguang Wu, Bin Yu, Jun Ying
Summary: This study investigates the combined impacts of the winter North Pacific Oscillation (NPO) and early spring Aleutian Low intensity (ALI) on the subsequent El Nino-Southern Oscillation (ENSO). Opposite-sign NPO-ALI years lead to pronounced sea surface temperature (SST) anomalies in the central and eastern Pacific in the following winter, while same-sign NPO-ALI years result in small SST anomalies. The constructive superposition of anomalies induced by NPO and ALI enhances the subtropical North Pacific SST and precipitation anomalies in late spring, which affects the tropical western central Pacific and subsequent winter ENSO occurrence. The observed joint impacts of NPO and ALI on ENSO are reproduced in most CMIP6 models.
Article
Geosciences, Multidisciplinary
Gaku Nishihira, Shusaku Sugimoto
Summary: La Nina typically lasts for two years, unlike El Nino. In the first winter of La Nina, there is increased diabatic heating over the tropical northwestern Pacific, leading to a teleconnection across the North Pacific and cold winters in Japan. In the second winter, there is reduced diabatic heating over the tropical northwestern Pacific, resulting in a shift of the teleconnection eastward and severe cold winters in northwestern North America, with no impact on Japan.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Guangzhi Xu, Lin Wang, Shuyu Wang
Summary: This study analyzed the variability of North Pacific Atmospheric Rivers (ARs) using a rotated Empirical Orthogonal Function (EOF) analysis and identified four major modes of AR occurrence. Each mode is influenced by different climate patterns and has potential predictive power for wintertime AR occurrences.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)