检索结果-南通市图书馆

Integrated assessment of air quality and climate change for policy-making: highlights of IPCC AR5 and research challenges

在线全文

学校读者我要写书评

暂无评论

National Science Review 2014年第2期1卷 176-179页

作者： hong liao Wenyuan Chang Institute of Atmospheric Physics Chinese Academy of Sciences Climate Change Research Center Chinese Academy of Sciences

Recently,air quality in China has received signiicant atention,especially since the unprecedented heavily polluted haze episodes were observed in populated areas of central and eastern China[1].Major atmospheric air pollutants include tropospheric ozone(O3)and aerosols(small liquid or solid particles,also called PM2.5 when referring to particles with diameters of 2.5μm or

关键词： IPCC Integrated assessment of air quality and climate change for policy-making highlights of IPCC AR5 and research challenges AR

Organic acid anions:An effective defensive weapon for plants against aluminum toxicity and phosphorus deficiency in acidic soils

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2016年第11期43卷 631-638页

作者： Zhi Chang Chen hong liao Root Biology Center Fujian Agriculture and Forestry University

Aluminum （AI） toxicity and phosphorous （P） deficiency are two major limiting factors for plant growth on acidic soils. Thus, the physiological mechanisms for AJ tolerance and P acquisition have been intensively studied. A commonly observed trait is that plants have developed the ability to utilize organic acid anions （OAs; mainly malate, citrate and oxalate） to combat AI toxicity and P deficiency. OAs secreted by roots into the rhizosphere can externally chelate Al^3＋ and mobilize phosphate （Pi）, while OAs synthesized in the cell can internally sequester Al^3＋ into the vacuole and release free Pi for metabolism. Molecular mechanisms involved in OA synthesis and transport have been described in detail. Ensuing genetic improvement for AI tolerance and P efficiency through increased OA exudation and/or synthesis in crops has been achieved by transgenic and marker-assisted breeding. This review mainly elucidates the crucial roles of OAs in plant Al tolerance and P efficiency through summarizing associated physiological mechanisms, molecular traits and genetic manipulation of crops.

关键词： Organic acid anions Al toxicity P defidency Acidic soils

Role of the Radiative Effect of Black Carbon in Simulated PM_(2.5) Concentrations during a Haze Event in China

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2014年第5期7卷 434-440页

作者： liao Li liao hong State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC) Institute of Atmospheric Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

The authors quantify the radiative effect of black carbon （BC） on simulated aerosol concentrations during the heavily polluted haze event of 11-14 January 2013 in northern China using the chemistry version of the Weather Research and Forecasting Model （WRF-Chem）. As a result of the stable synoptic conditions, simulated concentrations of BC and PM2.5 averaged over the study period were about 8-16 μg m-3 and 80-100 μg m-3, respectively, in the control simulation （CTRL）. When BC emissions were doubled （2BC）, tripled （3BC）, and quad- rupled （4BC） relative to the CTRL run, the simulated concentrations of aerosols in different regions showed distinct changes. The radiative effect of BC was simulated to increase concentrations of aerosols over Tianjin （Doml） and southern Henan （Dora3）, but to decrease in southern Hebei （Dora2）. Relative to the CTRL simulation, concen- trations of PM2s over Doml, Dom2, and Dom3 were simulated in 4BC to change by ＋18.6 1μg m-3 （＋32.3%）, -5.7 μg m 3 （-7.3%）, and ＋7.2 μg m3 （＋12.6%）, respec- tively. The BC-induced increases in aerosol concentra- tions corresponded mainly to the reductions in planetary boundary layer height over Doml and Dom3. The reduc- tions of aerosol concentrations in Dora2 were mainly caused by the weakened wind convergence at 850 hPa and reduced concentrations of sulfate and nitrate associ- ated with the reduced surface-layer ozone levels and rela- tive humidity.

关键词： aerosol black carbon PM2.5

Interannual and Decadal Changes in Tropospheric Ozone in China and the Associated Chemistry–Climate Interactions: A Review

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2019年第9期36卷 975-993页

作者： Yu FU hong liao Yang YANG Climate Change Research Center Chinese Academy of SciencesBeijing 100029China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China

China has been experiencing widespread air pollution due to rapid industrialization and urbanization in recent *** two major concerns of ambient air quality in China are particulate matter(PM)and tropospheric ozone(O3).With the implementation of air pollution prevention and control actions in the last five years,the PM pollution in China has been substantially *** contrast,under the conditions of the urban air pollution complex,the elevated O3 levels in city clusters of eastern China,especially in warm seasons,have drawn increasing *** of air pollutants and their precursors not only contribute to regional air quality,but also alter *** change in turn can change chemical processes,long-range transport,and local meteorology that influence air *** to PM,less is known about O3 pollution and its climate effects over ***,we present a review of the main findings from the literature over the period 2011-18 with regard to the characteristics of O3 concentrations in China and the mechanisms that drive its interannual to decadal variations,aiming to identify robust conclusions that may guide decision-making for emissions control and to highlight critical knowledge *** also review regional and global modeling studies that have investigated the impacts of tropospheric O3 on climate,as well as the projections of future tropospheric O3 owing to climate and/or emission changes.

关键词： tropospheric ozone chemistry-climate interactions interannual and decadal variations China

Improving crop nutrient efficiency through root architecture modifications

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2016年第3期58卷 193-202页

作者： Xinxin Li Rensen Zeng hong liao College of Life Sciences Fujian Agriculture and Forestry University Haixia Institute of Science and Technology Root Biology CenterFujian Agriculture and Forestry University

Improving crop nutrient ef ficiency becomes an essential consideration for environmentally friendly and sustainable agriculture. Plant growth and development is dependent on 17 essential nutrient elements,among them,nitrogen（N） and phosphorus（P） are the two most important mineral nutrients. Hence it is not surprising that low N and/or low P availability in soils severely constrains crop growth and productivity,and thereby have become high priority targets for improving nutrient ef ficiency in crops. Root exploration largely determines the ability of plants to acquire mineral nutrients from soils. Therefore,root architecture,the 3-dimensional con figuration of the plant＇s root system in the soil,is of great importance for improving crop nutrient ef ficiency. Furthermore,the symbiotic associations between host plants and arbuscular mycorrhiza fungi/rhizobial bacteria,are additional important strategies to enhance nutrient acquisition. In this review,we summarize the recent advances in the current understanding of crop species control of root architecture alterations in response to nutrient availability and root/microbe symbioses,through gene or QTL regulation,which results in enhanced nutrient acquisition.

关键词： Nitrogen nutrient efficiency phosphorus root architecture symbiosis

Partnering crops with root-associated microbes for soil health and agricultural sustainability

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2024年第1期34卷 26-29页

作者： Cunhu WANG Yongjia Zhong hong liao Root Biology Center College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China

Increasing global demand for food presents a significant challenge to maintaining soil health and sustainable production of agricultural crops. As plant root-associated microbial fitness is greatly impacted by community growth, development, and nutrient acquisition, the cultivation of functional assembly of root-associated microbes may provide solutions for achieving food security while maintaining healthy soils. Here, we propose a four-part strategy to promote soil health and agricultural productivity by partnering crops with root-associated microbes.

关键词： crops soil agricultural

Blood Pressure and Heart Rate Measurements Using Photoplethysmography with Modified LRCN

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第4期71卷 1973-1986页

作者： Chih-Ta Yen Cheng-hong liao Department of Electrical Engineering Taiwan Ocean UniversityKeelung City202301Taiwan Department of Electrical Engineering National Formosa UniversityYunlin County632Taiwan

In this study,single-channel photoplethysmography(PPG)signals were used to estimate the heart rate(HR),diastolic blood pressure(DBP),and systolic blood pressure(SBP).A deep learning model was proposed using a long-term recurrent convolutional network(LRCN)modified from a deep learning algorithm,the convolutional neural network model of the modified inception deep learning module,and a long short-term memory network(LSTM)to improve the model’s accuracy of BP and HR *** PPG data of 1,551 patients were obtained from the University of California Irvine Machine Learning *** to design a filter of PPG signals and how to choose the loss functions for deep learning model were also discussed in the ***,the stability of the proposed model was tested using a 10-fold cross-validation,with an MAE±SD of 2.942±5.076 mmHg for SBP,1.747±3.042 mmHg for DBP,and 1.137±2.463 bpm for the *** with its existing counterparts,the model entailed less computational load and was more accurate in estimating SBP,DBP,and *** results established the validity of the model.

关键词： Photoplethysmography(PPG)signal deep learning blood pressure systolic blood pressure(SBP) diastolic blood pressure(DBP) heart rate(HR)

Simulated Spatial Distribution and Seasonal Variation of Atmospheric Methane over China:Contributions from Key Sources

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2014年第2期31卷 283-292页

作者： ZHANG Dingyuan liao hong WANG Yuesi State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

We used the global atmospheric chemical transport model,GEOS-Chem,to simulate the spatial distribution and seasonal variation of surface-layer methane （CH4） in 2004,and quantify the impacts of individual domestic sources and foreign transport on CH4 concentrations over *** surface-layer CH4 concentrations over China exhibit maximum concentrations in summer and minimum concentrations in *** annual mean CH4 concentrations range from 1800 ppb over western China to 2300 ppb over the more populated eastern *** emissions were found to have large impacts on CH4 concentrations over China,contributing to about 85％ of the CH4 concentrations over western China and about 80％ of those over eastern *** tagged simulation results showed that coal mining,livestock,and waste are the dominant domestic contributors to CH4 concentrations over China,accounting for 36％,18％,and 16％,respectively,of the annual and national mean increase in CH4 concentration from all domestic *** from rice cultivation were found to make the largest contributions to CH4 concentrations over China in the summer,which is the key factor that leads to the maximum seasonal mean CH4 concentrations in summer.

关键词： methane GEOS-Chem seasonal variation foreign and domestic contributions

Climatic Effects of Air Pollutants over China:A Review

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2015年第1期32卷 115-139页

作者： liao hong CHANG Wenyuan YANG Yang State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC) Institute of Atmospheric Physics Chinese Academy of Sciences

Tropospheric ozone（O3） and aerosols are major air pollutants in the atmosphere. They have also made significant contributions to radiative forcing of climate since preindustrial times. With its rapid economic development, concentrations of air pollutants are relatively high in China; hence, quantifying the role of air pollutants in China in regional climate change is especially important. This review summarizes existing knowledge with regard to impacts of air pollutants on climate change in China and defines critical gaps needed to reduce the associated uncertainties. Measured monthly, seasonal, and annual mean surface-layer concentrations of O3 and aerosols over China are compiled in this work, with the aim to show the magnitude of concentrations of O3 and aerosols over China and to provide datasets for evaluation of model results in future studies. Ground-based and satellite measurements of O3 column burden and aerosol optical properties, as well as model estimates of radiative forcing by tropospheric O3 and aerosols are summarized. We also review regional and global modeling studies that have investigated climate change driven by tropospheric O3and/or aerosols in China; the predicted sign and magnitude of the responses in temperature and precipitation to O3/aerosol forcings are presented. Based on this review, key priorities for future research on the climatic effects of air pollutants in China are highlighted.

关键词： tropospheric ozone aerosols radiative forcing climate change