Li Qi

Xi'an Railway Survey and Design Institute

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Jinhai He

Nanjing University of Information Science and Technology

Wenjun Zhang

Nanjing University of Information Science and Technology

Xiangyu He

Hohai University

Wenming Yan

Hohai University

Tingfeng Wu

Hohai University

Yan Yin

Fujian Agriculture and Forestry University

Kui Chen

China Meteorological Administration

Minjuan Li

Hohai University

Shaofei Kong

China University of Geosciences

Liang Yuan

Chengdu University of Information Technology

Cooperative Institutions

Nanjing University of Information Science and Technology

Chinese Academy of Sciences

China Meteorological Administration

University of Chinese Academy of Sciences

Chinese Academy of Meteorological Sciences

Hohai University

Ministry of Natural Resources

Ministry of Ecology and Environment

Nanjing University

China Geological Survey

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April-June rainfall features in South China in relation to the establishment of summer monsoon in the South-China Sea

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2006)

Chi Yan-zhen Zhaoyong Guan Jinhai He Li Qi Zhang Xue-fen

In the context of daily rainfall from 58 stations in South China and day-to-day gridded reanalysis from NCEP/NCAR, study is performed of April-June precipitation features at different time intervals in the research area in relation to the establishment of summer monsoon in the South-China Sea (SCS). Results show that the rainfall consists of frontal and monsoon rainfall, the former occurring dominantly in April and the latter largely in June as its principal phase, indicating that the vapor transport, dynamic and thermal features vary greatly for both. Further analysis shows that the amount of the frontal precipitation bears an intimate relation to the time of monsoon onset. In the year of deficient frontal rainfall the Sri Lanka vortex appears earlier and spreads northwards, in combination with northward-advancing convective band from Sumatra to cause the Indo-Burma trough to be established, as well as the subtropical high-pressure belt to break and eastward retreat - all happen earlier than usual, a situation that favors the establishment of westerlies in the SCS, leading to earlier establishment of SCS summer monsoon. In years of plentiful frontal rainfall, however, the formation of the Bengal Bay trough depends mainly on the displacement of Sumatra convection into the Indo-China peninsula, a situation unfavorable for the earlier breaking of the subtropical high-pressure belt and its eastward movement, resulting in later establishment of west winds in the SCS, so that SCS summer monsoon has its establishment delayed.

Westerlies

Trough (economics)

Subtropical ridge

BENGAL

East Asian Monsoon

Monsoon trough

10.1117/12.678946

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Arsenic distribution characteristics and release mechanisms in aquaculture lake sediments

Journal of Hazardous Materials (2024)

Xiangyu He Wenming Yan Xiang Chen Yan Wang Minjuan Li

10.1016/j.jhazmat.2024.135141

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Citations (4)

Correction to: Critical influence of the Northeast cold vortex in different positions on precipitation

Climate Dynamics (2022)

Shujie Xu Li Qi

10.1007/s00382-022-06400-3

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Citations (0)

Changes in the Observed Trends in Extreme Temperatures over China around 1990

Journal of Climate (2012)

Li Qi Yuqing Wang

Abstract Based on the daily temperature data from weather stations in China, linear trends of the seasonal mean and extreme temperatures in summer and winter are analyzed and compared for the periods of 1960–89 and 1990–2009. The results show prominent changes in those trends since the early 1990s, in particular in winter—a signal of climate shift as previously identified. The changes, however, are found to be strongly region dependent. In summer, both seasonal mean and extreme temperatures show a considerable cooling trend in central China and a warming trend in north and south China before 1990. After 1990 all temperature indices show significant warming trends throughout China with the largest trend up to 4.47°C (10 yr)−1 in north China. In winter in north China, with the most prominent warming trend during 1960–89, there is a significant cooling trend in both the seasonal mean temperature and the cold temperature indices after 1990. The warming trends over the Tibetan Plateau are substantially enhanced since 1990. All indices for the diurnal temperature range (DTR) show consistent decreasing trends in both summer and winter throughout China before 1990 while they turn to increasing trends in northeast China in summer and over the Tibetan Plateau in winter after 1990. The annual temperature range displays a decreasing trend throughout China before 1990 while it is dominated by an increasing trend after 1990 except over the Tibetan Plateau and in a narrow band along the Yangtze River. Possible mechanisms for the observed trend changes are discussed.

Mean radiant temperature

Trend analysis

10.1175/jcli-d-11-00437.1

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Citations (65)

Seasonal patterns of water quality and phytoplankton dynamics in surface waters in Guangzhou and Foshan, China

The Science of The Total Environment (2017)

Yanggui Xu Adela Jing Li Junhao Qin Li Qi Jonathan G. Ho

Turbidity

Wet season

10.1016/j.scitotenv.2017.02.032

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Citations (53)

Secondary Organic Aerosol Formation from Volatile Chemical Product Emissions: Model Parameters and Contributions to Anthropogenic Aerosol

Environmental Science & Technology (2023)

Sreejith Sasidharan Yicong He Ali Akherati Li Qi Weihua Li

Volatile chemical products (VCP) are an increasingly important source of hydrocarbon and oxygenated volatile organic compound (OVOC) emissions to the atmosphere, and these emissions are likely to play an important role as anthropogenic precursors for secondary organic aerosol (SOA). While the SOA from VCP hydrocarbons is often accounted for in models, the formation, evolution, and properties of SOA from VCP OVOCs remain uncertain. We use environmental chamber data and a kinetic model to develop SOA parameters for 10 OVOCs representing glycols, glycol ethers, esters, oxygenated aromatics, and amines. Model simulations suggest that the SOA mass yields for these OVOCs are of the same magnitude as widely studied SOA precursors (e.g., long-chain alkanes, monoterpenes, and single-ring aromatics), and these yields exhibit a linear correlation with the carbon number of the precursor. When combined with emissions inventories for two megacities in the United States (US) and a US-wide inventory, we find that VCP VOCs react with OH to form 0.8–2.5× as much SOA, by mass, as mobile sources. Hydrocarbons (terpenes, branched and cyclic alkanes) and OVOCs (terpenoids, glycols, glycol ethers) make up 60–75 and 25–40% of the SOA arising from VCP use, respectively. This work contributes to the growing body of knowledge focused on studying VCP VOC contributions to urban air pollution.

Carbon fibers

Volatile organic compound

10.1021/acs.est.3c00683

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Citations (12)

Over-projected Pacific warming and extreme El Niño frequency due to CMIP5 common biases

National Science Review (2021)

Tao Tang Jing‐Jia Luo Ke Peng Li Qi Shaolei Tang

Extreme El Niño events severely disrupt the global climate, causing pronounced socio-economic losses. A prevailing view is that extreme El Niño events, defined by total precipitation or convection in the Niño3 area, will increase 2-fold in the future. However, this projected change was drawn without removing the potential impacts of Coupled Model Intercomparison Project phase 5 (CMIP5) models' common biases. Here, we find that the models' systematic biases in simulating tropical climate change over the past century can reduce the reliability of the projected change in the Pacific sea surface temperature (SST) and its related extreme El Niño frequency. The projected Pacific SST change, after removing the impacts of 13 common biases, displays a 'La Niña-like' rather than 'El Niño-like' change. Consequently, the extreme El Niño frequency, which is highly linked to the zonal distribution of the Pacific SST change, would remain mostly unchanged under CMIP5 warming scenarios. This finding increases confidence in coping with climate risks associated with global warming.

Climate extremes

10.1093/nsr/nwab056

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Citations (28)

Distribution characteristics of salt-out particles in steam turbine stage

Energy (2019)

Pengfei Hu Lihua Cao Jingkai Su Li Qi Yong Li

Chord (peer-to-peer)

Axial Compressor

10.1016/j.energy.2019.116626

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Citations (69)

Interdecadal Change of the South China Sea Summer Monsoon Onset around 2010

Research Square (Research Square) (2023)

Cihuang Wu Li Qi

Abstract The onset of the South China Sea summer monsoon (SCSSM) implies the transition of East Asian monsoon circulation from winter to summer, which affects not only the local weather and climate near the South China Sea (SCS) but also other regions through remote teleconnection. In this paper, the interdecadal variability characteristics of the SCSSM onset is analyzed by using various datasets as well as its possible causes. The results show that there is a significant interdecadal change in the onset date of the SCSSM around 2010. The onset is early around May 12 during 1994-2009, conversely, the onset is significantly late during 1980-1993 and 2010-2020 with an average of May 29. Besides, the SCS May climate also took significantly decadal shift around 2010 and manifested itself in atmospheric forcing on the ocean, thus the SCSSM onset is mainly influenced remotely by tropical Pacific SST anomaly. However, the close relationship between the SCS precipitation and tropical eastern Pacific SST drops dramatically after 1998, while its correlation with the tropical central Pacific SST rises up to -0.8 after 2010, playing a leading role. The related anomalous anticyclone over the SCS not only prevents the western Pacific subtropical high withdrawing eastward, but also weakens the activity of low-frequency oscillation and, both unfavorable for the convection formation and SCSSM onset. Therefore, besides the tropical eastern Pacific SST, more and special attentions should be paid on the tropical central Pacific SST condition, it will help us to monitor and predict the SCSSM onset effectively and improve the seasonal prediction of East Asia summer monsoon greatly.

Teleconnection

Anticyclone

Subtropical ridge

Anomaly (physics)

Forcing (mathematics)

10.21203/rs.3.rs-3065772/v1

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Atlantic Multidecadal Oscillation Modulates the Relation of ENSO With the Precipitation in the Central-Western Indian Ocean

Frontiers in Earth Science (2022)

Chiyu Zhao Xin Geng Li Qi

It is well known that the El Niño-Southern Oscillation (ENSO) could affect the precipitation anomalies in the central-western Indian Ocean (CWIP) through modifying the Walker circulation, with an El Niño generally accompanied by an enhanced CWIP. In this study, we find that this positive association is modulated by the Atlantic Multidecadal Oscillation (AMO). When ENSO and AMO are out-of-phase combinations (i.e., AMO-/El Niño and AMO+/La Niña), the CWIP is significantly stronger than that when they are in-phase cooperated. It is suggested that the AMO’s modulating effect mainly comprises two pathways that influence ENSO’s linkage with the CWIP. On one hand, AMO could modulate the SST variability in the central-eastern tropical Pacific with a stronger ENSO SST amplitude during its negative phase, thus influencing the ENSO-CWIP relationship. On the other hand, AMO is associated with a multidecadal atmospheric variation in the Walker circulation. The weakened circulation during the negative AMO phase favors an anomalous ascending flow over the central-western Indian Ocean, thereby favoring an enhanced CWIP there. Therefore, El Niño is accompanied by a more pronounced CWIP during the negative AMO phase compared to that during a positive AMO phase. For La Niña episodes, however, these two pathways have opposite modulation effects. Although AMO+/La Niña is weaker than AMO-/La Niña, the accompanied CWIP is relatively stronger as an multidecadal dry background induced by the Atlantic warming reinforces the negative CWIP anomaly generated by La Niña. We here highlight that the AMO decadal forcing needs to be considered when investigating the Indian Ocean atmospheric variabilities during ENSO events.

Anomaly (physics)

Walker circulation

10.3389/feart.2022.866241

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Citations (4)