Article
Meteorology & Atmospheric Sciences
Haili Wang, Chunzai Wang
Summary: Based on observational data, this study finds that there are large-scale anomalous cyclones and anticyclones in the western North Pacific (WNP), with similar occurrence numbers. The WNP anomalous cyclone is identified as an interannual circulatory anomaly that can persist from autumn to spring during La Niña years and from spring to summer during developing El Niño years. The central equatorial Pacific warming contributes to the WNP anomalous cyclone during developing El Niño years, while the combination of central equatorial Pacific cooling, tropical Indian Ocean cooling, and central WNP warming induces the WNP anomalous cyclone during La Niña years.
JOURNAL OF CLIMATE
(2023)
Article
Geosciences, Multidisciplinary
Antoine Blanc, Juliette Blanchet, Jean-Dominique Creutin
Summary: This study analyzes the link between Western Europe large-scale circulation and precipitation variability in the Northern French Alps from 1950 to 2017. The maximum pressure difference and singularity of geopotential shapes are found to explain a significant part of precipitation variability, especially in winter.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Mathematics
A. Constantin, R. S. Johnson
Summary: This study derives a generic system of equations to describe the dynamics of the steady atmosphere based on well-defined approximation methods. The new system recovers classical models such as the Ekman, geostrophic and thermal-wind, and is used to present solutions for various atmospheric phenomena. It enables a detailed description of the velocity field and identification of heat sources necessary to maintain motion.
JOURNAL OF DIFFERENTIAL EQUATIONS
(2021)
Article
Environmental Sciences
Mengtian Fan, Jianhua Xu, Wenzheng Yu, Yaning Chen, Minghua Wang, Wen Dai, Yuanwei Wang
Summary: This study analyzed the driving factors of temperature changes in Tianshan using multiple methods and found some important conclusions, including the rate of warming in Tianshan over the past 40 years as well as the seasonal and spatial variations. Additionally, several large-scale climate teleconnections associated with warming in Tianshan were identified.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Oceanography
Carsten Eden, Dirk Olbers, Thomas Eriksen
Summary: A new closure for lee wave drag on large-scale circulation has been developed and tested in both idealized and realistic ocean model simulations. The closure is based on the radiative transfer equation for internal gravity waves and consists of two energy compartments for up- and downward propagating waves. The simulations demonstrate how lee waves interact with the mean flow, contribute to mixing, and exhibit parameter sensitivities.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2021)
Article
Geosciences, Multidisciplinary
Susan L. Hautala, Garrett Finucane
Summary: This study used GO-SHIP's observational data to test the assumption of steady-state for deep ocean circulation, finding that, except for boundary currents, most regions in the deep ocean show quasi-steady-state planetary-scale potential density gradients during the modern observational period, with higher variability in some areas and shorter sections.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Xinyu Li, Riyu Lu, Xidong Wang
Summary: This study investigates the tropical and extratropical circulation anomalies that directly affect the summer rainfall over the Yangtze River basin (YRB). It is found that the heavier the YRB rainfall, the more necessary the cooperation between the tropical Western North Pacific anticyclonic anomaly and the midlatitude northeasterly anomalies. Furthermore, the midlatitude northeasterly anomalies can more efficiently induce the YRB rainfall compared to the tropical Western North Pacific anticyclonic anomaly.
JOURNAL OF CLIMATE
(2023)
Article
Multidisciplinary Sciences
Petru Vaideanu, Christian Stepanek, Mihai Dima, Jule Schrepfer, Fernanda Matos, Monica Ionita, Gerrit Lohmann
Summary: This study analyzes the coupled variability of sea ice concentration (SIC) and sea surface temperature (SST) and investigates the influence of different forcing factors on their variability. The findings highlight the importance of correctly representing the coupled SST-SIC variability induced by AMOC in climate models for understanding sea-ice evolution.
Article
Meteorology & Atmospheric Sciences
Yuanhuang Zhuang, Jingyong Zhang, Lingyun Wu
Summary: This study investigates the dominant modes of surface air temperature variations in Central Asia during the cold and warm seasons from 1979 to 2016. It found that the cold season temperature is influenced by the Scandinavia pattern and Arctic Oscillation, while the warm season temperature is closely tied to the East Atlantic/Western Russia pattern and North Atlantic Oscillation.
THEORETICAL AND APPLIED CLIMATOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Jun Xu, Rumeng Li, Qinghong Zhang, Yun Chen, Xudong Liang, Xiujie Gu
Summary: This study investigates the large-scale atmospheric circulation patterns during a severe flooding event in Henan province, China. The results show a strong association between the extreme precipitation event and the Type 8 circulation pattern, characterized by specific wind direction and high pressure location driven by geopotential height. The extreme precipitation during this event is mainly influenced by tropical cyclones and the West Pacific subtropical high, with possible contributions from other dynamics related to meso-scale convective storms.
SCIENCE CHINA-EARTH SCIENCES
(2022)
Article
Multidisciplinary Sciences
Mathilde Jutras, Carolina O. O. Dufour, Alfonso Mucci, Lauryn C. C. Talbot
Summary: The Labrador Current transports its cold, fresh, and well-oxygenated waters either towards the subpolar North Atlantic or the eastern American coast depending on large-scale forcing, which is partly driven by winds over the North Atlantic. The relative contribution of these waters to each region depends on the retroflection of the Labrador Current at the Grand Banks of Newfoundland, which is influenced by a large-scale circulation adjustment and wind patterns. Since 2008, a strong northward shift of the Gulf Stream dominates the other drivers, affecting the water properties and marine life in both export regions.
NATURE COMMUNICATIONS
(2023)
Article
Meteorology & Atmospheric Sciences
Chenbin Gao, Shujuan Hu, Jiankai Zhang, Wenxin Zhang, Deqian Li, Guolin Feng
Summary: In this study, the three-pattern decomposition of global atmospheric circulation (3P-DGAC) is used to investigate the dynamic synergistic effects of horizontal circulation, local meridional circulation, and local zonal circulation on the record-breaking extreme cold wave (ECW) in February 2021 across North America. The study reveals that the strengthening of blocking highs over the North Pacific and North Atlantic, along with the development of the North American trough and the subsequent strengthening of local meridional and zonal circulations, played significant roles in the formation and persistence of this ECW. The research highlights the effectiveness of 3P-DGAC in investigating the three-dimensional structural characteristics of anomalous circulations in ECWs.
ATMOSPHERIC RESEARCH
(2023)
Article
Meteorology & Atmospheric Sciences
Martin S. Singh, Sramana Neogi
Summary: A simple steady-state model is used to study the interaction between moist convection and large-scale ascent in the tropics. The model accurately describes the characteristics of the ascent region and provides a framework to understand the link between the large-scale structure of the tropical overturning circulation and mixing and microphysical processes in moist convection.
JOURNAL OF CLIMATE
(2022)
Article
Oceanography
S. M. Hamze-Ziabari, U. Lemmin, M. Foroughan, R. S. Reiss, D. A. Barry
Summary: Dome-shaped thermoclines form in the center of cyclonic gyres in large lakes, caused by pelagic upwelling. Field observations in Lake Geneva confirm the presence of intense pelagic upwelling within the surface mixed layer. A 3D numerical model suggests that nonlinear divergent flows and 3D ageostrophic strain are responsible for the chimney-like upwelling in the surface mixed layer.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Meteorology & Atmospheric Sciences
Graham P. Taylor, Paul C. Loikith, Hugo Kyo Lee, Enjamin Lintner, Hristina M. Aragon
Summary: This study uses a novel method to analyze the projections of large-scale atmospheric circulation over the Pacific Northwest of North America and reduces the uncertainties of changes in circulation patterns under high emissions scenarios. The results show significant changes in the frequency, temperature, and precipitation of climate model projections for the region in the next few decades.
JOURNAL OF CLIMATE
(2023)
Article
Environmental Sciences
Bin Liu, Jian Liu, Liang Ning, Weiyi Sun, Mi Yan, Chen Zhao, Kefan Chen, Xiaoqing Wang