Article
Meteorology & Atmospheric Sciences
Breanna L. Zavadoff, Ben P. Kirtman
Summary: The study reveals that the Pacific decadal oscillation (PDO) influences the frequency of North Atlantic Rossby wave breaking (RWB), with a greater number of anticyclonic RWB events recorded in the eastern half of the North Atlantic when the PDO is in its positive phase. Furthermore, the largest changes in RWB statistics occur when positive SST anomalies are present in the North Pacific, suggesting that they serve as fuel for high frequency Rossby wave train development and more dramatic changes to North Atlantic RWB statistics.
Article
Meteorology & Atmospheric Sciences
Chuan-chieh Chang, Sandro w. Lubis, Karthik Balaguru, L. ruby Leung, Samson m. Hagos, Philip j. Klotzbach
Summary: This study investigates the combined impacts of the Madden-Julian oscillation (MJO) and extratropical an-ticyclonic Rossby wave breaking (AWB) on subseasonal Atlantic tropical cyclone (TC) activity and their physical connections. The results show that both the MJO and AWB play a role in suppressing TC activity during certain phases, with AWB events in phases 6-7 having a greater impact on TC development than their phases 2-3 counterparts. The study also finds that the influence of the MJO on AWB in the western subtropical Atlantic can be attributed to the modulation of the convectively forced Rossby wave source over the tropical eastern Pacific.
JOURNAL OF CLIMATE
(2023)
Article
Environmental Sciences
Tingting Han, Shengping He, Botao Zhou, Shangfeng Li, Xin Hao
Summary: This study identified the impact of the North Pacific Oscillation (NPO) on summer precipitation in Northeast China. The results showed a significant positive correlation between the May NPO and midsummer precipitation during the period 1986-2010, while the correlation was not statistically significant during 1961-1985/2011-2020. The study also found that the NPO stimulated a stronger Rossby wave source over the North Pacific in the period 1986-2010. The anomalies of the Rossby wave source shifted to North America in June and to the North Atlantic in midsummer, influencing the midsummer precipitation in Northeast China through modulation of the atmospheric circulation.
Article
Meteorology & Atmospheric Sciences
Kayla Besong, Ben Kirtman
Summary: This study compares the impact of different blocking indices on the relationship between North Atlantic blocking and the North Atlantic Oscillation (NAO). The results show that the choice of index significantly affects the correlation results, with the AGP index showing a stronger correlation with the NAO. These findings suggest that different blocking events are being measured between the two indices, contributing to the observed differences in correlation analysis.
Article
Meteorology & Atmospheric Sciences
Jilan Jiang, Yimin Liu
Summary: The relationship between North Atlantic Oscillation (NAO) and Indian Ocean Dipole (IOD) has been investigated. The study found a significant correlation between March NAO and boreal summer and autumn IOD, independent of the El Nino-Southern Oscillation signal. The study also revealed the physical mechanism through which March NAO affects subsequent IOD, involving air-sea interaction over the western North Pacific.
Article
Environmental Sciences
Yifei Dai, Bin Wang, Na Wei, Jinjie Song, Yihong Duan
Summary: This study investigates the impact of the North Pacific Gyre Oscillation (NPGO) on tropical cyclone genesis (TCG) in the western North Pacific (WNP). The findings show that the NPGO has opposite effects on TCG in the west and east WNP, resulting in an overall negative correlation between the NPGO and WNP total TCG number. The study highlights the importance of the NPGO's climate impact and its implications for predicting changes in WNP TCG.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Ioana Ivanciu, Thando Ndarana, Katja Matthes, Sebastian Wahl
Summary: Ridging South Atlantic Anticyclones play an important role in precipitation over South Africa. This study distinguishes ridging highs (RHs) with and without Rossby wave breaking (RWB) and shows that RHs with RWB contribute more precipitation. The two types of RHs exhibit distinct sea level pressure anomalies and influence the flow of moisture-laden air onto land. Furthermore, RWB mediates the impact of climate change on RHs, with RHs without RWB showing little change and RHs with RWB contributing more precipitation over southern South Africa and less precipitation over northeastern South Africa in the future.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Rajat Joshi, Rong Zhang
Summary: Using a high-resolution climate model, it is found that changes in the North Atlantic can impact the upper troposphere/lower stratosphere temperature and vertical motion over the extratropical North Pacific during winter. The warming temperature response in the upper troposphere/lower stratosphere is caused by biases in the North Atlantic cold surface temperature, while the vertical motion response is associated with the North Atlantic induced Walker circulation response over the tropical North Pacific.
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
(2023)
Article
Oceanography
Hanshi Wang, Ziguang Li, Xiaopei Lin, Jian Zhao, Dexing Wu
Summary: The rapid warming in the subpolar North Atlantic is partially generated by wind stress anomalies, which trigger topographic and planetary Rossby waves. These waves redistribute heat in the upper ocean and warm the Labrador Sea and Irminger Sea with a time lag. The baroclinic mode dominates the magnitude of the adiabatic warming in the subpolar North Atlantic.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Jun-Hyeok Son, Jae-Il Kwon, Ki-Young Heo
Summary: The Tibetan Plateau plays a key role in impacting the tracks of Western Pacific typhoons by modulating downstream Rossby waves, resulting in a westward shift of the typhoon tracks over North East Asia. This dynamic relationship has implications for both seasonal weather prediction and an understanding of long-term climate change.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Meteorology & Atmospheric Sciences
Shabin Hao, Jiandong Li, Jiangyu Mao
Summary: This study investigates the interannual relationship between the summer North Atlantic Oscillation (SNAO) and autumn precipitation anomalies over Yunnan, Southwest China. The results show that SNAO has a significant positive correlation with Yunnan precipitation in November. The physical mechanisms involve changes in sea surface temperature anomalies and the propagation of middle-upper tropospheric wave trains.
JOURNAL OF METEOROLOGICAL RESEARCH
(2022)
Article
Meteorology & Atmospheric Sciences
Xiaowei Hong, Riyu Lu, Shangfeng Chen, Shuanglin Li
Summary: This study investigates the relationship between the summer North Atlantic Oscillation (SNAO) and the Silk Road pattern (SRP) and classifies the SNAO into two categories: strongly linked and weakly linked. It finds that the strongly linked SNAO is associated with precipitation and wind anomalies in northwestern Europe, leading to the formation of the SRP. The study also discusses the interdecadal correspondence between SNAO and SRP and finds similar results.
JOURNAL OF CLIMATE
(2022)
Article
Meteorology & Atmospheric Sciences
Biyo Thomas, Ravi Kumar Kunchala, Bhupendra Bahadur Singh, Kondapalli Niranjan Kumar
Summary: The weather of the subtropical Indian region is influenced by Rossby Wave Breaking (RWB), which causes dynamic changes in the atmosphere. However, there are limited studies on RWB events in the region. This study detects 513 RWB events during the period of 1979-2021 and analyzes their climatology and variability. The frequency and intensity of RWB events have significantly increased in the last two decades, particularly during winter months in the northwest parts of the Indian subcontinent. RWB promotes extreme rainfall and is influenced by sea surface temperature conditions in the Pacific ocean.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Biyo Thomas, Ravi Kumar Kunchala, Bhupendra Bahadur Singh, Kondapalli Niranjan Kumar
Summary: The weather in the subtropical Indian region is influenced by Rossby Wave Breaking (RWB) triggered atmospheric changes. This study investigates the RWB events in the region using a Potential Vorticity (PV) contour searching algorithm. A total of 513 RWB events were detected during the period of analysis, with an increase in frequency and intensity observed during the last two decades. The spatial distribution of RWB occurrences is prominent in the northwest parts of the Indian subcontinent during winter.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Geosciences, Multidisciplinary
Shuai-Lei Yao, Wen Zhou, Fei-Fei Jin, Fei Zheng
Summary: The study suggests that a cooling in sea surface temperature due to Atlantic Multidecadal Variability can trigger a pan-Pacific response through wind-induced anomalies, leading to the development of a warm-phase pattern similar to IPO.
GEOPHYSICAL RESEARCH LETTERS
(2021)