Article
Meteorology & Atmospheric Sciences
Gareth J. Marshall, Ryan L. Fogt, John Turner, Kyle R. Clem
Summary: The study demonstrates that ERA5 best reproduces Antarctic near-surface air temperatures in the early period and is also the most homogeneous reanalysis across the early and late periods, indicating a significant change in the relationship between Southern Annular Mode (SAM) and Antarctic near-surface air temperatures between the two periods.
Article
Meteorology & Atmospheric Sciences
Qiuyan Zhang, Yang Zhang, Zhaohua Wu
Summary: Using the ensemble empirical mode decomposition method, this study investigates the multiple timescales of the southern annular mode (SAM) and identifies the importance of longer-timescale variabilities, especially the cross-seasonal variability, for the persistence of SAM. The study also shows that the cross-seasonal variability of SAM is associated with extratropical air-sea interaction.
Article
Meteorology & Atmospheric Sciences
O. Morgenstern
Summary: The analysis of CMIP6 simulations reveals that the trends in the Southern Annular Mode (SAM) are primarily attributed to ozone depletion, with seasonal variations due to the influences of greenhouse gas increases and stratospheric ozone changes. Models with interactive ozone chemistry show significant differences in attributing SAM changes to these influences compared to models without interactive chemistry.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Meteorology & Atmospheric Sciences
Mengzhou Yang, Xia Shi, Chaoxia Yuan, Xinyu Lu, Jingchan Liu
Summary: The study investigates the extreme precipitation (EP) in the early and late rainy seasons in Southern China from the perspective of moist static energy (MSE). The EP is accompanied by the charge-discharge paradigm of the vertically integrated MSE, which is dominated by horizontal and vertical advection. The synoptic systems responsible for MSE charge differ between the early and late rainy seasons due to the different horizontal distributions of climatological MSE in the lower troposphere.
JOURNAL OF CLIMATE
(2023)
Article
Geosciences, Multidisciplinary
Yue Dong, Lorenzo M. Polvani, David B. Bonan
Summary: Despite global warming, the Southern Ocean has experienced cooling over recent decades. Previous studies have suggested that this cooling is caused by the strengthening of surface winds associated with the positive trend of the Southern Annular Mode. However, our analysis shows that the SAM trend is unlikely to be the main cause of the observed long-term cooling.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Oceanography
Darryn W. Waugh, Kial Stewart, Andrew McC Hogg, Matthew H. England
Summary: The response of ventilation of mode and intermediate waters to abrupt changes in the Southern Annular Mode (SAM) differs between the central Pacific Ocean and other basins, with large decreases in age of waters in the central Pacific and small changes in the Atlantic and Indian Oceans. These interbasin differences can be explained by zonal variations in wind stress changes associated with the SAM.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Multidisciplinary Sciences
Jonathan King, Kevin J. Anchukaitis, Kathryn Allen, Tessa Vance, Amy Hessl
Summary: This study uses data assimilation to reconstruct the Southern Annular Mode over the last 2000 years and finds that its history reflects natural climate variability, except for the most-recent positive trend. The Southern Annular Mode is the leading mode of atmospheric variability in the extratropical Southern Hemisphere and has wide-ranging effects on ecosystems and societies. The study also suggests that the modern positive trend of the Southern Annular Mode is likely a response to anthropogenic climate change.
NATURE COMMUNICATIONS
(2023)
Article
Geosciences, Multidisciplinary
P. Khatri, T. Hayasaka, B. Holben, S. N. Tripathi, P. Misra, P. K. Patra, S. Hayashida, U. C. Dumka
Summary: Aerosols emitted in the densely populated and industrialized Indo-Gangetic Plain have significant impacts on regional climate and water cycle. Reductions in aerosol loadings during the COVID-19 lockdown period led to atmospheric warming, increased cloud optical thickness and cloud-particle effective radius, and decreased air temperature in the lower troposphere.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Willem Huiskamp, Shayne McGregor
Summary: This study uses a pseudoproxy framework to reconstruct SAM from the output of a global climate model, finding that reconstructions based on precipitation fields perform better. Non-stationarity of proxy-SAM teleconnections plays a role in reconstructions, and networks with proxies sourced from a geographically broad region with at least 70 proxies are most likely to be successful.
CLIMATE OF THE PAST
(2021)
Article
Geosciences, Multidisciplinary
Tariq Ejaz, Waliur Rahaman, C. M. Laluraj, K. Mahalinganathan, Meloth Thamban
Summary: El Nino Southern Oscillation (ENSO), Interdecadal Pacific Oscillations (IPO), and their phase relation with the Southern Annular Mode (SAM) play a significant role in controlling Antarctic climate variability. This study presents a new ice core record from coastal Dronning Maud Land (DML) and explores the influence of these climate modes on Antarctic temperature variability. The findings reveal that a significant portion of the variability in the oxygen isotope (delta O-18) records is related to late spring to summer temperature. The reconstruction of the DML temperature record shows a cooling trend in the 19th century followed by a warming trend in the 20th and early 21st centuries, coinciding with an increase in ENSO events and its antiphase relation with SAM.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Meteorology & Atmospheric Sciences
Fei Zheng, Jianping Li, Shuailei Yao
Summary: The Southern Annular Mode (SAM) is crucial in regulating Southern Hemisphere circulation, and models show variation in simulating its long-term changes. A study on SAM trends in CMIP5 models suggests that extratropical sea surface temperature (SST) anomalies, such as the Southern Ocean Dipole (SOD), play a role in influencing the SAM trend. Models with a strong SOD-SAM relationship tend to better simulate the SAM trend, indicating the importance of improving the simulation of this relationship for accurately representing long-term SAM changes.
ADVANCES IN ATMOSPHERIC SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
M. Jucker, R. Goyal
Summary: Southern Hemisphere Stratospheric Warming Events (SWEs) are usually associated with a negative phase of the tropospheric Southern Annular Mode (SAM) during the following summer. However, through ensemble climate model simulations, it is shown that these SWEs can cause periods of positive tropospheric SAM in austral spring by increasing lower stratospheric static stability and changing troposphere-to-stratosphere wave propagation. Eventually, the tropospheric SAM switches sign to its negative phase in late spring/early summer due to the downward propagation of the stratospheric signal, which is forced dynamically and radiatively by adiabatic heating and increased shortwave absorption by ozone, respectively.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Divya Prakash, Sunita Verma, Swagata Payra, Vivek Kumar
Summary: This study identified the impact of a solar eclipse on meteorological parameters and trace gases using statistical analyses. The solar eclipse led to a rapid decrease in solar direct radiation, a decrease in temperature, and a slight increase in relative humidity. The eclipse also had an inverse correlation with the variations in trace gases.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Meteorology & Atmospheric Sciences
Suneet Dwivedi, Pushpa Pandey, B. N. Goswami
Summary: This study found that the relationship between the Southern Annular Mode Index (SAMI) and Indian Summer Monsoon Rainfall (ISMR) is non-stationary and may have multi-decadal variability. However, there is a strong correlation between SAMI and June-July ISMR, which is linked to sea surface temperature anomalies in the Southern Hemisphere.
Article
Meteorology & Atmospheric Sciences
Iago Perez, Marcelo Barreiro, Cristina Masoller
Summary: The study assesses the impact of low-frequency climate modes on Rossby Wave Packets (RWPs) in the southern hemisphere summer, focusing on long-lived RWPs. It found that the occurrence of long-lived RWPs is influenced by SAM phases, with negative SAM events promoting their occurrence. ENSO influence was found to be weak and inconsistent.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Meteorology & Atmospheric Sciences
Yue Sun, Jianping Li, Hao Wang, Ruize Li, Xinxin Tang
Summary: The September rainfall over Northern China in 2021 was the heaviest since 1961 and had unprecedented socioeconomic impacts. The study found that the warm sea surface temperature anomalies over the tropical Atlantic, cold sea surface temperature anomalies over the tropical Pacific, Southern Annular Mode-like pattern in the Southern Hemisphere, and North Pacific Oscillation-like pattern in the Northern Hemisphere jointly strengthened the Indian monsoon and led to this rainfall event. Additionally, the extreme air acceleration in the east Asian upper-level jet entrance region played a crucial role.
Article
Meteorology & Atmospheric Sciences
Bolan Gan, Tianyu Wang, Lixin Wu, Jianping Li, Bo Qiu, Haiyuan Yang, Li Zhang
Summary: Through the study of short-term climate variations on a decadal scale, we found that the Kuroshio Extension system undergoes periodic changes between stable and unstable states. This variation is caused by a coupled ocean-atmosphere delayed oscillator, with the winter oceanic surface conditions and slow oceanic Rossby wave adjustment playing a key role.
JOURNAL OF CLIMATE
(2023)
Article
Meteorology & Atmospheric Sciences
Qian Zou, Quanjia Zhong, Jiangyu Mao, Ruiqiang Ding, Deyu Lu, Jianping Li, Xuan Li
Summary: Based on a simple coupled Lorenz model, this study investigates how to assess an appropriate initial perturbation scheme for ensemble forecasting in a multiscale system. Four initial perturbation approaches are used, and the results show that the ensemble averages perform better than the control forecast after short lead times in a fast subsystem and after a relatively long period of time in a slow subsystem. Adding perturbations to fast variables or slow variables can contribute to an improvement in the forecasting skill for these variables. The nonlinear local Lyapunov vectors (NLLVs) show higher forecasting skill compared to bred vectors (BVs) or random perturbations (RPs).
ADVANCES IN ATMOSPHERIC SCIENCES
(2023)
Article
Environmental Sciences
Ai Zhang, Rui Wang, Qianfeng Liu, Zhengjun Yang, Xiaohui Lin, Jing Pang, Xiaoyu Li, Dan Wang, Jiayu He, Jianping Li, Mingyue Zhang, Yue Yu, Xu-Chen Cao, Xi Chen, Nai-jun Tang
Summary: This study investigated the association between TBBPA levels in breast adipose and breast cancer, as well as the mediating role of adipose metabolites. TBBPA was found to be significantly associated with breast cancer, and significant perturbation was observed in the linoleic acid metabolism pathway. The phospho-lipid PC (16:0/16:0) was identified as a potential mediator of the association between TBBPA exposure and breast cancer risks.
ENVIRONMENTAL POLLUTION
(2023)
Article
Chemistry, Analytical
Lianming Zhang, Dan Li, Shuhuai Li, Jianping Li, Xionghui Ma, Mingyue Wang
Summary: A dual recognition strategy based on a protein and an ion-imprinted polymer (IIP) was proposed to develop highly sensitive sensors for copper(II) ions (Cu2+). The sensor showed high sensitivity due to the amplification effect of GO/Au NPs. The sensor exhibited a recovery rate of 93.2-105.6% for Cu2+ detection in actual samples.
MICROCHEMICAL JOURNAL
(2023)
Article
Materials Science, Biomaterials
Chenchen Zhao, Jianping Li, Huihua Cai, Dingwei Wu, Suwan Tao, Chaoran Pi, Lian Zhu, Na Xu, Tongcun Zhang
Summary: Chronic endometritis is a common gynecological disease caused by recurrent infections, and it is closely related to myositis, miscarriage, and infertility. Current clinical therapy lacks satisfactory treatment methods. Mesenchymal stem cell (MSC)-derived exosomes, which have promising immunomodulatory and tissue repair abilities, have been used to treat inflammatory diseases. This study proposes that exosomes derived from inflammation-stimulated MSCs have stronger inhibition ability for inflammation.
BIOMATERIALS SCIENCE
(2023)
Article
Environmental Sciences
Xuanliang Ji, Juan Feng, Jianping Li, Xingrong Chen
Summary: This study investigates the modulation of Indo-Pacific warm pool (IPWP) thermal conditions on the relationships between the Hadley circulation (HC) and different tropical sea surface temperature (SST) meridional structures. The study finds that the relationship between HC and tropical SST is suppressed in cold IPWP conditions, while it is equivalent to the climatology in warm IPWP conditions. This suppression is attributed to the association between the La Nina decay phase and significant equatorially asymmetric SST anomalies within the IPWP.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Agronomy
Yu Ru, Chenming Hu, Xuyang Chen, Fengbo Yang, Chao Zhang, Jianping Li, Shuping Fang
Summary: The study examines the interaction between the canopy of fruit trees, the airflow field, and the droplet penetration ratio using a mobile LIDAR system and wind tunnel experiments. The results show that wind velocity decreases during canopy penetration, with the lowest value at the back of the canopy. A quadratic exponential regression model is found to be the most accurate in predicting the droplet penetration ratio. This research provides valuable information for optimizing spraying parameters and improving pesticide utilization.
Article
Meteorology & Atmospheric Sciences
Xuan Li, Ruiqiang Ding, Jianping Li
Summary: In this study, the local predictability of summer heatwave events in south China was investigated using the BNLLE method. The results showed the high predictability of summer temperature and the wide range of local predictability limits for major heatwave events. The error dynamics and regional dynamical information revealed the heterogeneous spatial distribution of error growth and limitations in heatwave forecasting in the northern regions of south China.
Article
Meteorology & Atmospheric Sciences
Hao Wang, Jianping Li, Fei Zheng, Fei Li
Summary: This study investigates the synergistic effect of the summer positive North Atlantic Oscillation (pNAO) and positive northwest Pacific (pNWP) sea surface temperature anomaly (SSTA) on the interannual variability of extreme heat events in central-eastern China (CEC). The results show that the two factors act synergistically in strengthening extreme heat events in the CEC through a series of atmospheric bridges. The pNWP SSTA increases the strength of pNAO, leading to a stronger eastward propagation of Rossby waves and an anomalous anticyclone over the CEC, resulting in extreme heat events.
Article
Meteorology & Atmospheric Sciences
Xinxin Tang, Jianping LI, Yazhou Zhang, Yanjie LI, Ssen Zhao
Summary: This study reveals that the increase in winter precipitation over the southeastern United States (SEUS) is linked to El Nin similar to o and the negative phase of North Atlantic Oscillation (NAO2). The synergy between El Nin similar to o and NAO2 leads to the enhancement of transient eddies and stationary waves, promoting the propagation of stronger stationary waves from the Pacific to SEUS and North Atlantic. This results in a positive phase of the meridional dipole and induces precipitation in the SEUS.
JOURNAL OF CLIMATE
(2023)
Article
Multidisciplinary Sciences
Ruiqiang Ding, Hyacinth C. Nnamchi, Jin-Yi Yu, Tim Li, Cheng Sun, Jianping Li, Yu-Heng Tseng, Xichen Li, Fei Xie, Juan Feng, Kai Ji, Xumin Li
Summary: The connection between the North Tropical Atlantic (NTA) sea surface temperature (SST) anomalies and El Nino-Southern Oscillation (ENSO) events varies considerably over multidecadal timescales and is mainly controlled by the multidecadal variability of the North Atlantic Oscillation (NAO). During the positive phase of the NAO, the NTA impact on ENSO is amplified due to strengthening of precipitation over the equatorial Atlantic and enhancement of the persistence of NTA SST anomalies.
NATURE COMMUNICATIONS
(2023)
Article
Meteorology & Atmospheric Sciences
Qi Tian, Ruiqiang Ding, Jianping Li
Summary: This study evaluates the simulations of the NTA mode and NTA-ENSO connection using CMIP5 and CMIP6 historical simulations. The results show that most models can reproduce the spatial pattern of the NTA mode reasonably, although there are some differences in the central values and position. Furthermore, the analysis indicates that the CMIP5/CMIP6 models have a large diversity in the NTA-ENSO connection, which may be attributed to their differences in simulating the spring climatological mean Atlantic ITCZ precipitation and spring-to-summer NTA SST persistence. The CMIP6 models perform better in simulating the NTA-ENSO connection compared to the CMIP5 models.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Qin Hong, Juan Feng, Jianping Li
Summary: Based on observational data, this study investigates the effects of Central Pacific (CP) El Nino events on the relationship between the Hadley circulation (HC) and tropical sea surface temperature (SST) under different meridional structures. It is found that the variability of HC and SST, decomposed into equatorially symmetric and asymmetric components, shows decreased explained variances during CP El Nino events. The HC's response to SST under different meridional structures is suppressed, mainly due to the inhomogeneous variations of SST anomalies in the tropical eastern Pacific (EP), particularly with a greater amplitude in the north EP.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Hao Wang, Ziguang Li, Jianping Li, Xiaopei Lin, Xiao-Tong Zheng, Lei Fan, Yu Zhang
Summary: The variability of tropical Atlantic sea surface temperature (SST) can impact the East Asian summer monsoon (EASM). The interannual EASM-TA relationship exhibits interdecadal variation modulated by the Interdecadal Pacific Oscillation (IPO). Understanding the IPO-modulated EASM-TA relationship helps better forecast EASM variability.
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
(2023)
