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Surface air temperature change in the Wuyi Mountains,southeast China

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Journal of Mountain Science 2024年第6期21卷 1992-2004页

作者： QIN Yihui WEI Yuxing LU Jiayi MAO Jiahui CHEN Xingwei GAO Lu CHEN Ying LIU Meibing DENG Haijun Institute of Geography Fujian Normal UniversityFuzhou 350117China National Demonstration Center for Experimental Geography Education Fujian Normal UniversityFuzhou 350117China School of Geographical Science Fujian Normal UniversityFuzhou 350117China Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters Fujian Normal UniversityFuzhou 350117China Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education Fujian Normal UniversityFuzhou 350117China

Detecting changes in surface air temperature in mid-and low-altitude mountainous regions is essential for a comprehensive understanding of warming trend with *** use daily surface air temperature data from 64 meteorological stations in Wuyi Mountains and its adjacent regions to analyze the spatio-temporal patterns of temperature *** results show that Wuyi Mountains have experienced significant warming from 1961 to *** warming trend of the mean temperature is 0.20℃/decade,the maximum temperature is 0.17℃/decade,and the minimum temperature is 0.26℃/*** 1961-1990,more than 63%of the stations showed a decreasing trend in annual mean temperature,mainly because the maximum temperature decreased during this ***,in 1971-2000,1981-2010 and 1991-2018,the maximum,minimum and mean temperatures *** fastest increasing trend of mean temperature occurred in the southeastern coastal plains,the quickest increasing trend of maximum temperature occurred in the northwestern mountainous region,and the increase of minimum temperature occurred faster in the southeastern coastal and northwestern mountainous regions than that in the central ***,this study suggests that elevation does not affect warming in the Wuyi *** results are beneficial for understanding climate change in humid subtropical middle and low mountains.

关键词： Climate change Surface air temperature Temporal and spatial changes Mann-Kendall nonparametric test Wuyi Mountains

Assessment of Typhoon Disaster Development Situation based on Online Social Media Data 6

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Assessment of Typhoon Disaster Development Situation based o...

6th International Conference on Artificial Intelligence and Big Data, ICAIBD 2023

作者： Huixian, Jiang Lijing, Chen Yao, Chen Fujian Normal University Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters Institute of Geograph Fuzhou China Fujian Normal University School of Mathematics and Statisice Fuzhou China Fujian Normal University Institute of Geograph Fuzhou China

ISBN: (纸本)9781665491259

Social media, an emerging source of disaster data, provides a new information channel for the assessment of disaster development situation. Aiming at the assessment of typhoon disaster development situation, this paper creates a typhoon disaster dictionary based on topic identification and disaster classification knowledge base, by integrating the natural language processing technology and information characteristics of typhoon disasters, and mining the information in microblog texts of typhoon disaster that can reflect people's sentiment, discussions about disaster, user information, location, etc. on the basis of social media microblog data. Besides, it also determines the disaster - sentiment indexes, and combines the typhoon disaster - sentiment indexes and multi-source data to design a method of assessing the typhoon disaster development situation based on the microblog data. Meanwhile, it further develops a typhoon disaster situation awareness system, and realizes the process of disaster information and visualization of disaster development, so as to help disaster emergency managers to grasp the spatial distribution pattern of disaster development situation and make reasonable relief strategies. © 2023 IEEE.

关键词： disasters

Spatiotemporal pattern of climate change in the China-Myanmar Economic Corridor from 1901 to 2018

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Journal of Mountain Science 2024年第1期21卷 131-145页

作者： YANG Xiaoliu LI Yungang GAO Lu Institute of Geography Fujian Normal UniversityFuzhou 350117China School of Geographical Sciences Fujian Normal UniversityFuzhou 350117China Institute of International Rivers and Eco-Security Yunnan UniversityKunming 650500China Fujian Provincial Engineering Research Center for Monitoring and Accessing Terrestrial Disasters Fujian Normal UniversityFuzhou 350117China Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education Fujian Normal UniversityFuzhou 350117China

The China-Myanmar Economic Corridor(CMEC) is an important part of China's Belt and Road Initiative and an important area for global ecology and biodiversity. In this study, the annual and seasonal spatiotemporal patterns of temperature and precipitation in the CMEC over the past century were investigated using linear tendency estimation, the Mann-Kendall mutation test, the T-test, and wavelet analysis based on the monthly mean climatic data from 1901 to 2018 released by the Climatic research Unit(CRU) of the University of East Anglia, UK. The results show that the CMEC demonstrated a trend of warming and drying over the past 100 years, and the rate of change in Myanmar was stronger than that in Yunnan Province of China. The warming rate was 0.039 ℃/10a. Precipitation decreased at a rate of -6.1 mm/10a. From the perspective of spatial distribution, temperature was high in the central and southern, low in the north of the CMEC, and the high-temperature centers were mainly distributed in the southern plain and river valley. Precipitation decreased from west to east and from south to north of the CMEC. From the perspective of the rate of change, warming was stronger in central and northern CMEC than in southern and northeastern CMEC. The rate of precipitation decline was stronger in the central and western regions than in the eastern region. This study provides a scientific reference for the CMEC to address climate change and ensure sustainable social and economic development and ecological security.

关键词： China-Myanmar Economic Corridor CRU Air temperature Precipitation Spatiotemporal pattern

Spatial and temporal variations in nitrogen retention effects in a subtropical mountainous basin in Southeast China

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Journal of Mountain Science 2021年第10期18卷 2672-2687页

作者： LIU Mei-bing CHEN Xing-wei CHEN Ying GAO Lu DENG Hai-jun State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province Fujian Normal UniversityFuzhou 350007China College of Geographical Sciences Fujian Normal UniversityFuzhou 350007China Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters Fujian Normal UniversityFuzhou 350007China

Nitrogen retention within a watershed reduces the amount of N exported to the ocean;however, it worsens environmental problems, including surface water eutrophication, aquifer pollution, acid rain, and soil acidification. Here, we adopted the Soil and Water Assessment Tool(SWAT) model to describe the riverine N output and retention effects in the Shanmei Reservoir Basin, a subtropical mountainous basin located in Quanzhou City, Southeast China. The results revealed that farmlands and orchards in the upstream and central parts of the basin were the dominant land use types, which contributed large N yields. Fertilizer application was the key source of riverine N output and N retention within the basin. On average, approximately 64% of anthropogenic N inputs were retained within the basin, whereas 36% of total N was exported to the downstream and coastal areas. The average N retention efficiency was 80% in a dry year, and within the year, N retention occurred in spring and summer and N release occurred in autumn and winter. The annual variation in N retention within the basin was largely dominated by changes in rainfall and runoff, whereas the seasonal characteristics of N retention were mainly affected by fertilization. Even with a large decrease in fertilizer application, owing to the contributions of the residual N pool and river background, the riverine N output still maintained a certain base value. The effects of precipitation, land use types, and agricultural fertilizer on N retention should be comprehensively considered to implement reasonable N management measures.

关键词： Nitrogen retention Riverine nitrogen output Precipitation and runoff Fertilization management Subtropical mountainous basin

Assessment of Typhoon Disaster Development Situation based on Online Social Media Data

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Assessment of Typhoon Disaster Development Situation based o...

International Conference on Artificial Intelligence and Big Data (ICAIBD)

作者： Jiang Huixian Chen Lijing Chen Yao Institute of Geograph Fujian Normal University Fujian Provincial Engineering Research Center For Monitoring And Assessing Terrestrial Disasters Fuzhou China School of Mathematics and Statisice Fujian Normal University Fuzhou China Institute of Geograph Fujian Normal University Fuzhou China

Social media, an emerging source of disaster data, provides a new information channel for the assessment of disaster development situation. Aiming at the assessment of typhoon disaster development situation, this paper creates a typhoon disaster dictionary based on topic identification and disaster classification knowledge base, by integrating the natural language processing technology and information characteristics of typhoon disasters, and mining the information in microblog texts of typhoon disaster that can reflect people’s sentiment, discussions about disaster, user information, location, etc. on the basis of social media microblog data. Besides, it also determines the disaster - sentiment indexes, and combines the typhoon disaster - sentiment indexes and multi-source data to design a method of assessing the typhoon disaster development situation based on the microblog data. Meanwhile, it further develops a typhoon disaster situation awareness system, and realizes the process of disaster information and visualization of disaster development, so as to help disaster emergency managers to grasp the spatial distribution pattern of disaster development situation and make reasonable relief strategies.

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Spatiotemporal Patterns and Propagation of Meteorological and Hydrological Drought in a Humid Basin of Southeast China

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SSRN 2024年

作者： Gan, Beibei Liu, Meibing Cui, Hongming Chen, Xingwei Chen, Ying Gao, Lu Deng, Haijun Institute of Geography Fujian Normal University Fuzhou350117 China School of Geographical Sciences School of Carbon Neutrality Future Technology Fujian Normal University Fuzhou350117 China Key Laboratory of Humid Subtropical Eco-geographical Process of Ministry of Education Fujian Normal University Fuzhou350117 China Fujian Provincial Engineering Research Center for Monitoring and Accessing Terrestrial Disasters Fuzhou350117 China

Quantifying the temporal and spatial variation characteristics, propagation processes, and influential factors of meteorological drought (MD) and hydrological drought (HD) is of vital importance for effectively managing drought risk in a constantly changing environment. This study analyzed the spatiotemporal patterns of MD and HD using the standardized precipitation index (SPI) and standardized runoff index (SRI) during the period 1975–2020. The drought propagation time (DPT) from MD to HD at the seasonal scale was determined by the maximum Pearson correlation coefficient. The effects of climate change and large reservoirs on the spread of drought were further *** results indicate that MRB experienced relatively severe MD and HD after 2000. HD generally lags behind MD, and the severity of HD is alleviated in the short term but lasts longer. The DPT from MD to HD generally varies from 3 to 7 months, with an average of 3 months, and the DPT in spring and summer is generally shorter than that in autumn and winter. The factors affecting MD and HD in the MRB vary with the season. In particular, precipitation is always the dominant factor, while high temperatures can easily induce drought in spring and summer. El Niño Southern Oscillation (ENSO) is an important factor influencing seasonal drought. The propagation time in summer and winter is prolonged due to the operation of large reservoirs. © 2024, The Authors. All rights reserved.

关键词： Climate change

Spatiotemporal Variation of Water Cycle Components in Minjiang River Basin Based on a Correction Method for Evapotranspiration Products

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SSRN 2023年

作者： Zheng, Meiling Chen, Xingwei Ruan, Weifang Yao, Huaxia Gu, Zipeng Geng, Kaili Li, Xiaocheng Deng, Haijun Chen, Ying Liu, Meibing School of Geographical Science Fujian Normal University Fuzhou350117 China Fujian Province Engineering Research Center for Monitoring and Assessing Terrestrial Disasters Fuzhou350117 China State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology Fuzhou350117 China Fujian Institute of Water Resources & Hydropower Research Fuzhou350001 China Department of Geography Nipissing University North BayON Canada

Study region: Minjiang River Basin of *** focus ：This paper aimed to study the spatiotemporal changes in water cycle components including evapotranspiration (ET) and terrestrial water storage in a watershed. To achieve this, we proposed a method to correct ET products based on the water balance and measured annual precipitation and runoff data. Subsequently, the annual terrestrial water storage changes were derived, and the trend analysis of water cycle components was conducted using the Mann-Kendall trend *** hydrological insights for the region: (1) The Global Land Data Assimilation System (GLDAS) product overestimated ET in the Minjiang River Basin from 2000 to 2019, which was 105.18mm higher than ET. Through sub-basin validation, the relative error between the corrected ET and the ET is less than 5.1%. The terrestrial water storage change fluctuated between -400 and 355 mm. The proposed method can construct a reasonable annual dataset of water cycle components. (2) Precipitation and runoff in the Minjiang River Basin from 2000 to 2019 showed non-significant increasing trends, while ET exhibited a significant increase with a Mann-Kendall trend test Z-value of 2.63. Temperature and normalized difference vegetation index (NDVI) were the main influencing factors on the variation of ET, with correlation coefficients of 0.37 and 0.48, respectively. © 2023, The Authors. All rights reserved.

关键词： Evapotranspiration

Multi-Metric Insights on Humid Heatwaves in China: Regional Shifts and Climate Adaptation

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SSRN 2025年

作者： Lin, Sinuo You, Jiewen Yin, Fangxu Gao, Lu School of Geographical Sciences Fujian Normal University Fuzhou China Key Laboratory for Humid Subtropical Eco-geographical Processes Ministry of Education Fujian Normal University Fuzhou China Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters Fujian Normal University Fuzhou China

Humid heatwaves (HHW) are becoming increasingly significant threats to public health and the socio-economy, particularly in China. However, little is known about the differences among various metrics used to quantify HHW events. Here, we employed three metrics to identify HHW events, including wet‒bulb temperature (Tw), simplified wet‒bulb globe temperature (sWBGT) and heat index (HI). We investigated the spatiotemporal evolutions of comprehensive HHW characteristics, including exposure, intensity, duration, and onset-offset across China from 1961 to 2022. The results show that: 1) since the 1990s, more than 90% of regions have experienced HHW exposure (proportion and number) and duration (cumulative duration and longest continuous) increased significantly (P © 2025, The Authors. All rights reserved.

关键词： Risk management

Influence of Typical Clay Minerals on Aggregation and Settling of Pristine and Aged Polyethylene Microplastics

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SSRN 2022年

作者： Wang, Yi Chen, Xingwei Wang, Feifeng Cheng, Niansheng Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters Fujian Normal University Fuzhou350007 China School of Geographical Sciences Fujian Normal University Fuzhou350007 China State Key Laboratory for Subtropical Mountain Ecology Ministry of Science and Technology Fujian Normal University Fujian Province Fuzhou350007 China Fujian Province Key Laboratory of Pollution Control and Resource Recycling Fujian Normal University Fuzhou350007 China Ocean College Zhejiang University Zhoushan316021 China

Microplastics (MPs) are emerging as a class of pollutants that are a potential threat to biological and human health. The aging process can alter the physicochemical properties of MPs, which is critical to their fate and transport in the aquatic environment. This study investigated the effect of typical clay minerals on the aggregation and settling behavior of pristine and aged polyethylene microplastics (PEs) in different electrolyte solutions. The results showed that clay minerals enhance the stability of PEs by increasing electrostatic repulsion during heteroaggregation, and electrostatic interactions dominate the process of heteroaggregation. Moreover, the Hamaker constant decreases after ageing of PEs and the increased surface negative charge inhibits homoaggregation in NaCl solutions. In contrast, the specific reaction of divalent cations with the O-containing groups on the surface of aged PEs weakens the electrostatic repulsion. The aggregation mechanism is consistent with the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Interestingly, typical clay minerals cause PEs, which are always suspended or floating in the upper layers of the water column, to settle through a heteroaggregation process in NaCl solutions. These results provide new insights into the environmental fate and distribution of MPs in natural waters. © 2022, The Authors. All rights reserved.

关键词： Agglomeration