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Changes of coastline and tidal flat and its implication for ecological protection under human activities: Take China’s Bohai Bay as an example

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China Geology 2024年第1期7卷 26-35页

作者： Yong Li Ming-zheng Wen Heng Yu Peng Yang Fei-cui Wang Fu Wang Tianjin Center China Geological SurveyMinistry of Natural ResourcesTianjin 300170China Key Laboratory of Coast Geo-environment China Geological SurveyMinistry of Natural ResourcesTianjin 300170China Tianjin Key Laboratory of Coast Geological Processes and Environmental Safety Tianjin 300170China Hebei University of Environmental Engineering Qinhuangdao 066102China Hebei Engineering Research Center for Ecological Restoration of seaward Rivers and Coastal Waters Qinhuangdao 066102China Department of Earth and Environment Boston UniversityBoston 02215USA

The change processes and trends of shoreline and tidal flat forced by human activities are essential issues for the sustainability of coastal area,which is also of great significance for understanding coastal ecological environment changes and even global *** on field measurements,combined with Linear Regression(LR)model and Inverse Distance Weighing(IDW)method,this paper presents detailed analysis on the change history and trend of the shoreline and tidal flat in Bohai *** shoreline faces a high erosion chance under the action of natural factors,while the tidal flat faces a different erosion and deposition patterns in Bohai Bay due to the impact of human *** implication of change rule for ecological protection and recovery is also *** should be taken to protect the coastal ecological *** models used in this paper show a high correlation coefficient between observed and modeling data,which means that this method can be used to predict the changing trend of shoreline and tidal *** research results of present study can provide scientific supports for future coastal protection and management.

关键词： Shoreline Tidal flat Erosion deposition patterns changing trend Ecological protection Human activity Linear regression model Inverse distance weighing method Prediction Bohai Bay

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changing trends of Daily Temperature Extremes with Different Intensities in China

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Acta meteorologica Sinica 2012年第4期26卷 399-409页

作者：王遵娅丁一汇张强宋亚芳 National Climate Center China Meteorological Administration National Climate Center China Meteorological Administration China Meteorological Administration

By comparing two sets of quality-controlled daily temperature observation data with and without the inhomogeneity test and adjustment from 654 stations in China during 1956 2004 and 1956-2010, impacts of inhomogeneity on changing trends of four percentile temperature extreme indices, including occurrences of cold days, cold nights, warm days, and warm nights with varying intensities, were discussed. It is found that the inhomogeneity affected the long-term trends averaged over extensive regions limitedly. In order to minimize the inhomogeneity impact, the 83 stations identified with obvious inhomogeneity impacts were removed, and an updated analysis of changing trends of the four temperature extreme indices with varying intensities during 1956 2010 was conducted. The results show that annual occurrences of both cold nights and cold days decreased greatly while those of warm nights and warm days increased significantly during the recent 20 years. The more extreme the event is, the greater the magnitude of changing trends for the temperature extreme index is. An obvious increasing trend was observed in annual occurrences of cold days and cold nights in the recent four years. The magnitude of changing trends of warm extreme indices was greater than that of cold extreme indices, and it was greater in northern China than in southern China. trends for summer occurrence of cold days were not significant. Decreasing trends of occurrences of both cold nights and cold days were the greatest in December, January, and February （DJF） but the least in June, July, and August （JJA）, while increasing trends of warm nights were the greatest in JJA. Cold nights significantly decreased from 1956 to 1990, and then the decreasing trend considerably weakened. The decreasing trend also showed an obvious slowdown in recent years for occurrence of cold days. However, increasing trends of warm nights and warm days both have been accelerated continuously since the recent decades. Further analy

关键词： temperature extremes cold nights cold days warm nights warm days changing trend

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Analysis of Water Quality Variation and trend in the Ji'an Section of the Ganjiang River

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Meteorological and Environmental Research 2021年第6期12卷 59-67页

作者： Yingjie XIAO Fengxiang LANG Peng XU Xiaoyan ZOU Wu ZOU Yan MAO Hydrology and Water Resources Monitoring Center in the Middle Reaches of the Ganjiang River Ji an 343100China

Based on the monitoring data of water quality in the Ji'an section of the Ganjiang River from 2008 to 2018 by the Water Resources Monitoring Center of Ji'an City,single factor evaluation method,comprehensive pollution index method and seasonal Kendall test method were adopted to study and analyze the characteristics of surface water resources and the changing trend of water quality in the river *** results show that the water quality in the Ji'an section of the Ganjiang River was generally good,and the water quality of each function zone reached the target *** comprehensive pollution index was controlled between 0.21 and 0.40 over the years,and there was no significant change in time and space,and the water quality was relatively *** dissolved oxygen and permanganate index tended to improve,and there was no change in five-day biochemical oxygen demand,while ammonia nitrogen and total phosphorus showed an upward *** water quality as a whole showed a trend of *** discussing the influencing factors of the characteristic pollutants,the causes of water quality in the Ji'an section of the Ganjiang River were further *** is suggested to strengthen the supervision and control of non-point source and point source pollution.

关键词： Ji'an section of the Ganjiang River Water function zone Ammonia nitrogen Total phosphorus changing trend

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Quantitative estimation of climate change effects on potential evapotranspiration in Beijing during 1951-2010

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Journal of Geographical Sciences 2014年第1期24卷 93-112页

作者： LIU Haijun LI Yan JOSEF Tanny ZHANG Ruihao HUANG Guanhua College of Water Sciences Beijing Normal University Beijing 100875 China College of Water Resources and Civil Engineering China Agricultural University Beijing 100083 China Institute of Soil Water and Environmental Sciences Agricultural Research Organization The Volcani CenterP. O. Box 6 Bet Dagan 50250 Israel State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of WaterResources and Hydropower Research Beijing 100048 China

℃ Climate change is likely to affect hydrological cycle through precipitation, evapotranspiration, soil moisture etc. In the present study, an attempt has been made to study the climate change and the sensitivity of estimated evapotranspiration to each climatic variable for a semi-arid region of Beijing in North China using data set from 1951 to 2010. Penman-Monteith method was used to calculate reference crop evapotranspiration （ETo）. Changes of ETo to each climatic variable was estimated using a sensitivity analysis method proposed in this study. Results show that in the past 60 years, mean temperature and vapor pressure deficit （VPD） were significantly increasing, relative humidity and sunshine hours were significantly decreasing, and wind speed greatly oscillated without a significant trend. Total precipitation was significantly decreasing in corn season （from June to September）, but it was increasing in wheat season （from October to next May）. The change rates of tem- perature, relative humidity, VPD, wind speed, annual total precipitation, sunshine hours and solar radiation were 0.42℃, 1.47%, 0.04 kPa, 0.05 m.s-1, 25.0 mm, 74.0 hours and 90.7 MJ.m-2 per decade, respectively. In the past 60 years, yearly ETo was increasing with a rate of 19.5 mm per decade, and total ETos in wheat and corn seasons were increasing with rates of 13.1 and 5.3 mm per decade, respectively. Sensitivity analysis showed that mean air temperature was the first key factor for ETo change in the past 60 years, causing an annual total ETo increase of 7.4%, followed by relative humidity （5.5%） and sunshine hours （-3.1%）; the less sensitivity factors were wind speed （0.7%）, minimum temperature （-0.3%） and maximum temperature （-0.2%）. A greater reduction of total ETo （12.3%） in the past 60 years was found in wheat season, mainly because of mean temperature （8.6%） and relative hu- midity （5.4%）, as compared to a reduction of 6.0% in ETo during corn season due to sunshinehours （-6.9%）, relative

关键词： climatic variables reference crop evapotranspiration Penman-Monteith equation changing trend sensitivity analysis

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Current Situation and Evolution of Drought and Flood in Fen-wei Plain

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Meteorological and Environmental Research 2015年第1期6卷 31-36,41页

作者： Lei Xiangjie Li Hualong Zhang Guohong Li Hongmei Wang Juan Lei Tianjiao Shaanxi Climate Center Shaanxi Remote Sensing Information Center for Agriculture Shanxi Climate Center Northwest University

Based on the latest results and data of drought and flood in Fen-wei Plain, current situation and evolution of drought and flood in Fen-wei Plain were analyzed. The results show that in Fen-wei Plain drought and flood are natural disasters bringing about the most serious damage, and drought risk in east central Weihe Plain is serious. In Fen-wei Plain, precipitation tended to decrease, and temperature, drought days and intensity increased over the past 50 years. There were obvious differences between two decades in drought and flood. Drought was the severest in the 1990s, and flood was the most serious in Fenhe Plain in the 1960s and in Weihe Plain from the late 1970s to the early 1980s. Over the past ten years, precipitation and flood frequency increased, and temperature, drought days and intensity decreased. In Fen-wei Plain, temperature will rise and precipitation will increase slightly in next 20 -40 years. Monitoring and early warning capability of drought and flood in Fen-wei Plain have im- proved gradually, but some issues need to be paid more attention to and solved.

关键词： Fen-wei Plain Drought and flood changing trend Decadal variation China

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Analysis of changing Characteristics and trends of Temperature and Precipitation in Yanshi City in Recent 50 Years

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Meteorological and Environmental Research 2015年第10期6卷 1-4页

作者： Zhang Yuan Lightning Protection Center of Henan Province

Based on meteorological observation data of temperature and precipitation in Yanshi City from 1961 to 2010, annual and interdecadal variations of annual average temperature, annual average maximum temperature, annual average minimum temperature, and annual average pre- cipitation in Yanshi City in recent 50 years were analyzed, and then M-K test of changing trend of annual average temperature was conducted. The results showed that from 1961 to 2010, annual average temperature, annual average maximum temperature and annual average minimum tempera- ture showed a significantly increasing trend in Yanshi City, rising by 0.30, 0.20 and 0.50 ~（3/10 a respectively. Annual average temperature was the lowest in the 1970s and the highest in 2000 -2010. There was a sudden change in annual average temperature in 1995. In the 50 years, annual av- erage precipitation in Yanshi City increased by 1.8 mm/10 a, but the increase was not significant. The minimum of annual average precipitation 511.3 mm appeared in the 1960s, while the maximum 553.2 mm appeared in 2000 -2010.

关键词： Temperature changing trend Precipitation M-K test Yanshi City China

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Preliminary Studies on Evaluation and Change trends of Dominant Components in New Types of Tobacco Sheets by Thick Pulp Process

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Agricultural Biotechnology 2022年第6期11卷 126-129,133页

作者： Hao SHU Xiangbing TANG Ziwei WANG Xinge ZHANG Wanxia WANG Dan LI Qunshan YAN Tongfu SU Yanqiu JING Song GAO Bin XIONG Hubei Xinye Reconstituted Tobacco Development Co. Ltd.Wuhan 430212China College of Tobacco Henan Agricultural UniversityZhengzhou 450002China College of Science Henan Agricultural UniversityZhengzhou 450002China

[Objectives]This study was conducted to deeply understand the effects of production process on the quality of new types of tobacco sheets with different flavors.[Methods]Based on the pilot production process of thick pulp method,four different flavors of tobacco sheets were sampled at several links in the production process,for the detection of the contents of the main components in the samples,including propylene glycol,glycerol,menthol and glyceryl triacetate,so as to explore the change trends of various components in the thick pulp process.[Results]The change laws of propylene glycol and glycerol contents had a very high similarity,showing a trend of first decreasing and increasing *** changes of menthol content and glyceryl triacetate content were greatly affected by the specific flavor *** one of the indexes of the new tobacco evaluation system,the alcohol-to-ester ratio data need to be further improved in the actual production and application process.[Conclusions]This study provides basic data support for improving the quality of tobacco sheets.

关键词： New tobacco product Thick pulp process Heat-not-burn tobacco product Tobacco sheets changing trend

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Variation Characteristics and trends of Temperature and Evaporation in Huanren County in Recent 60 Years

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Meteorological and Environmental Research 2016年第3期7卷 7-9页

作者： Zhao Lei Ji Qi Li Ji Wang Junchao Meteorological Bureau of Huanren Manchu Autonomous County Huanren 117200 China Benxi Meteorological Bureau Benxi 117000China

Based on the data of daily average temperature and evaporation in Huanren County from 1953 to 2012, the changing characteristics and trends of temperature and evaporation were analyzed by using climatic tendency rate and sliding Ttest method. The results showed that annual av- erage temperature in Huanren County showed a significant increasing trend in recent 60 years, and its linear tendency rate was 0.26 ℃/10 a. Tem- perature increase was in other seasons except for summer. There was a sudden change in annual average temperature in 1987, and winter average temperature changed suddenly in 1969 and 1985, while there were no sudden changes in average temperature in other seasons. Annual average evaporation also decreased, and its linear trend rate was -8.19 mm/10 a; average evaporation tended to decrease in spring and summer and in- creased in autumn and winter. In a word, the climate tended to be warm and dry in Huanren County.

关键词： Temperature Evaporation changing trend Mutation detection Huanren County China

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Climate change analysis of sea surface temperature in Chengshantou based on homogenized observatory array

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Marine Science Bulletin 2020年第2期22卷 1-10页

作者： Tian Wei ZOU Shuguang LIU lizhao ZOU Yan Information Service Center of Offshore oil production plant SINOPEC Shengli Oilfield CompanyDongying 257000Shandong provinceChina Yantai Oceanic Environmental Monitoring Central Station Rongcheng 264321Shandong provinceChina

The observational sea surface temperature(SST)data from 1960 to 2017 of the Chengshantou marine station has been adjusted by the Penalized Maximal Test(PMT)developed by the Climate Research Center of the Environment Ministry of Canada,based on the metadata *** this study,the homogenous surface air temperature(SAT)data from neighboring meteorological observation stations are used to construct the reference series by correlation coefficient weighted averaged *** climate change characteristics of the Chengshantou SST were analyzed using the homogenized *** show that the annual average SST trend has changed significantly before and after the *** warming trend increased from 0.04℃/10 a before revision to 0.15℃/10 *** warmest five years occurred mostly after 1980,that is,1973,1989,2002,2007 and *** generally showed a significant upward trend and significant inter-decadal *** the 1960s to the end of the 1980s,it was a colder stage,and then began to warm *** was a warmer period from the 1990s to the *** 1960 to 2017,the jump point occurred in 1987,which is very consistent with the temperature characteristics of China's mainland.

关键词： seawater temperature climatic variability changing trend climatic tendency

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Analysis of Season Change in Jiyang from Meteorological Standpoint

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Agricultural Science & Technology 2012年第5期13卷 1073-1075页

作者：刘树峰苏轶济南市气象局山东济南250002

[Objective] The aim was to analyze changing characters of four seasons in Jiyang, providing references for farming and disaster prevention in the area. [Methed] changing characters of initial time and lasting periods of four seasons in Jiyang for 30 years were analyzed from meteorological standpoint with weather information from 1981 to 2010 observed in surface meteorological observation in Jiyang. [Result] Recent 30 years, initial time of spring and winter in Jiyang were earlier than before, especially for spring. In contrast, initial time of summer and autumn were later, especially for autumn. In addition, periods of spring and winter declined and the latter changed more significantly. Meanwhile, periods of summer and autumn extended and rate of linear trend for summer period was 0.042 hou/year. [Conclusion] The research indicated that lasting days of summer extended significantly and of spring and winter shortened under the background of global warming.

关键词： Four seasons Initial time Lasting period changing trend

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