检索结果-南通市图书馆

conomic losses from reduced freshwater under future climate scenarios: An example from the Urumqi River,tianshan Mountains

引用

Journal of Arid Land 2022年第2期14卷 139-153页

作者： ZHANG Xueting CHEN Rensheng LIU Guohua Qilian Alpine Ecology and Hydrology research station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100012China College of Urban and Environment Sciences Northwest UniversityXi'an 710000China

As important freshwater resources in alpine basins,glaciers and snow cover tend to decline due to climate warming,thus affecting the amount of water available downstream and even regional economic ***,impact assessments of the economic losses caused by reductions in freshwater supply are quite *** study aims to project changes in glacier meltwater and snowmelt of the Urumqi River in the tianshan Mountains under future climate change scenarios(RCP2.6(RCP,Representative Concentration Pathway),RCP4.5,and RCP8.5)by applying a hydrological model and estimate the economic losses from future meltwater reduction for industrial,agricultural,service,and domestic water uses combined with the present value method for the 2030 s,2050 s,2070 s,and 2090 *** results indicate that total annual glacier meltwater and snowmelt will decrease by 65.6%and 74.5%under the RCP4.5 and RCP8.5 scenarios by the 2090 s relative to the baseline period(1980-2010),*** to the RCP2.6 scenario,the projected economic loss values of total water use from reduced glacier meltwater and snowmelt under the RCP8.5 scenario will increase by 435.10×10^(6) and 537.20×10^(6) CNY in the 2050 s and 2090 s,respectively,and the cumulative economic loss value for 2099 is approximately 2124.00×10^(6) *** also find that the industrial and agricultural sectors would likely face the largest and smallest economic losses,*** economic loss value of snowmelt in different sectorial sectors is greater than that of glacier *** findings highlight the need for climate mitigation actions,industrial transformation,and rational water allocation to be considered in decision-making in the tianshan Mountains in the future.

关键词： glacier meltwater snowmelt freshwater supply water use economic losses future climate scenario climate change tianshan Mountains

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Growth trends and environmental drivers of major tree species of the northern hardwood forest of eastern North America

引用

Journal of Forestry research 2023年第1期34卷 37-50页

作者： Rebecca L.Stern Paul G.Schaberg Shelly A.Rayback Christopher F.Hansen Paula F.Murakami Gary J.Hawley Rubenstein School of Environment and Natural Resources The University of VermontBurlingtonVT 05405USA ERM MalvernPA 19355USA Forest Service United States Department of AgricultureNorthern Research StationBurlingtonVT 05405USA Department of Geography The University of VermontBurlingtonVT 05405USA

The future health and productivity of tree species in the northern hardwood forest of eastern North America are uncertain considering changes in climate and pollution loading *** better understand the trajectory of the northern hardwood forest,we studied the growth of three tree species emblematic of it:sugar maple(Acer saccharum Marsh),American beech(Fagus grandifolia Ehrh.),and yellow birch(Betula alleghaniensis Britton),plus a fourth species,red maple(Acer rubrum L.),whose abundance has increased in the *** also analyzed the link between growth and several factors for690 trees in 45 plots throughout Vermont,USA:tree age and size,site elevation,and climate and acid deposition *** their chronologies(1945-2014),all four species exhibited increasing growth followed by plateaued growth indicative of a maturing *** all species,summer moisture was positively correlated with growth,summer temperature was negatively associated with growth,and winter moisture or snow were positively correlated with *** last association was expected for sugar ***,our data suggest that winter snowpack may be more broadly relevant in sustaining tree growth in a region where snow has historically insulated the soil from freezing that can damage roots and lead to reduced aboveground *** of pollution deposition were also correlated with growth for all species except American beech—a species with documented tolerance to pollutant *** the four species studied,red maple had the fewest associations with environmental variables,which suggests that it may be less susceptible to growth reductions as the climate changes.

关键词： Climate change Sugar maple Yellow birch American beech Red maple

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The triggering mechanisms for different types of snow avalanches in the continental snow climate of the central tianshan Mountains

引用

Science China Earth Sciences 2022年第12期65卷 2308-2321页

作者： Jiansheng HAO Peng CUI Xueqin ZHANG Lanhai LI Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China China-Pakistan Joint research Center on Earth Sciences Chinese Academy of Sciences-Higher Education Commission of PakistanIslamabad 45320Pakistan State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Ili station for Watershed Ecosystem research Chinese Academy of SciencesXinyuan 835800China

Climate change and human activities have increased avalanche risks in alpine ***,strengthening the research on mitigating and controlling avalanche disasters is indispensable for sustainable socio-economic development in mountainous *** avalanche warning is an essential means of avalanche disaster ***,the theoretical development and application of avalanche warning strategies remain limited due to the lack of systematic understanding of the triggering mechanisms of *** on observational data(2015–2019)of avalanches,snowpack,meteorological parameters,surface soil temperature and moisture,and topography in avalanche-prone areas in the central tianshan Mountains,we analyzed the characteristics of different types of avalanches under a continental snow climate and the environmental factors(such as meteorological conditions and snowpack)that trigger avalanches,as well as the triggering mechanisms for different types of avalanches under the continental snow climate in terms of snow-layer shear fracture *** found that the snowpack parameters,weather conditions,and soil temperature and moisture varied significantly among the stages of snow accumulation,stabilization,and melting,resulting in different avalanches prevailing in different stages of snowpack ***,the snow-layer fractures were driven by single external factors or the combined multiple factors under the continental snow ***-four percent of the avalanche events in the study area occurred during or after a snowfall,with 36%related to sudden increases in *** considering different triggering scenarios,snowpack evolution stages,and the coupling of intrinsic and extrinsic drivers of triggering snow-layer shear failure,we constructed five snow-layer shear fracture modes and twelve avalanche-triggering modes on mountain slopes under a continental snow climate.

关键词： Continental snow climate avalanche disaster snow-layer failure Shear fracture modes avalanche-triggering modes Central tianshan Mountains

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chemical Characteristics and Environmental Records of a snow-Pit at the Glacier No.12 in the Laohugou Valley, Qilian Mountains

引用

Journal of Earth Science 2014年第2期25卷 379-385页

作者： Xiaoqing Cui Jiawen Ren Xiang Qin Weijun Sun Guangming Yu Zebin Wang Weigang Liu State Key Laboratory of Cryospheric Science Cold and Arid Region Environment and Engineering Research InstituteChinese Academy of Sciences Qilian Shan station of Glaciology and Ecologic Environment Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province Institute of Arid MeteorologyChina Meteorological Administration

In June 2006, samples were collected from a 90 cm snow-pit at an elevation of 5 040 m a.s.l, in the northern branch firn basin of the Glacier No. 12, Laohugou Valley, in the western part of Qilian Mountain, China. Oxygen isotopes （6180） and major soluble ions were measured. Results showed that Ca2＋ is the dominant cation, and SO42 is the dominant anion. All major ions have close positive correlations with eachother except NO3 and NH4＋. 6180 show positive correlation with air temperature. The method of correlation analysis, sea-salt ion tracer and trend analysis were used to determine the source of the chemical components. The correlation analysis and HYSPLIT backward trajectory analysis suggest that atmospheric soluble dust species dominate the chemical signature.

关键词： snow-pit glaciochemistry Glacier No. 12 at Laohugou ion Qilian Mountain.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Loss of total phenols from leaf litter of two shrub species: dual responses to alpine forest gap disturbance during winter and the growing season

引用

Journal of Plant Ecology 2020年第3期13卷 369-377页

作者： Wei He Wanqin Yang School of Life Science Taizhou UniversityTaizhou 318000ZhejiangChina Long-term research station of Alpine Forest Ecosystem Institute of Ecology&ForestrySichuan Agricultural UniversityChengdu 611130SichuanChina College of Horticulture and Forestry Sciences/Hubei Engineering Technology research Center for Forestry Information Huazhong Agricultural UniversityWuhan 430070HubeiChina

Aims Alpine forest gaps can control understory ecosystem processes by manipulating hydrothermal ***,we aimed to test the role of alpine forest gap disturbance on total phenol loss(TPL)from the decomposing litter of two typical shrub species(willow,Salix paraplesia Schneid.,and bamboo,Fargesia nitida(Mitford)Keng f.).Methods We conducted a field litterbag experiment within a representative fir(Abies faxoniana Rehd.)forest based on‘gap openness treatments’(plot positions in the gap included the gap center south,gap center north,canopy edge,expanded edge and closed canopy).The TPL rate and litter surface microbial abundance(fungi and bacteria)of the two shrub species were measured during the following periods over 2 years:snow formation(SF),snow cover(SC),snow melting(ST),the early growing season(EG)and the late growing season(LG).Important Findings At the end of the study,we found that snow cover depth,freeze–thaw cycle frequency and the fungal copies g−1 to bacterial copies g−1 ratio had significant effects on litter *** abundances of fungi and bacteria decreased from the gap center to the closed canopy during the SF,SC,ST and LG periods and showed the opposite trend during the EG *** rate of TPL among plot positions closely followed the same trend as microbial abundance during the first year of *** addition,both species had higher rates of TPL in the gap center than at other positions during the first winter,first year and entire 2-year *** findings suggest that alpine forest gap formation accelerates litter TPL,although litter TPL exhibits dual responses to gap disturbance during specific critical *** conclusion,reduced snow cover depth and duration during winter warming under projected climate change scenarios or as gaps vanish may slow litter TPL in alpine biomes.

关键词： alpine forest gap freeze–thaw cycle fungi to bacteria ratio snow cover depth total phenols

来源：

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

Analyses on the air and snow temperatures near ground with observations of an AWS at Dome A,the summit of Antarctic Plateau

引用

Chinese Science Bulletin 2010年第14期55卷 1430-1436页

作者： CHEN BaiLian ZHANG RenHe XIAO CunDe BIAN LinGen ZHANG TingJun Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Chinese Academy of Meteorological Sciences Beijing 100081 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Cold and Arid Regions Environmental and Engineering research Institute Chinese Academy of Sciences Lanzhou 730000 China The National snow and Ice Data Center University of Colorado Boulder CO 80309-0449 USA

As the summit of the Antarctic Plateau, Dome A has been received international *** this paper, observational data of an automatic weather station (AWS) at Dome A in 2005–2007 were used to analyze the seasonal variations of air temperatures near the ground and snow temperatures within a depth of 10 m. Analyses on the air temperatures show a typical feature of the coreless winter, and strong inversion maintains during the long winter. Accordingly the stratification near the ground is dominated by the near-neutral stable states. Seasonal fluctuations of the snow temperature decrease in amplitude and lag in phase with depth increasing, which leads to distinct seasonal temperature profiles within the depth of 10 m. Measurements show the mean annual air temperature near ground is about 5°C higher than the 10 m firn temperature due to the strong inversion near the ground. However, our estimation of the annual mean of air temperature at the ground based on the boundary layer theory is close to the mean 10 m firn temperature. The lowest air temperature (–82.7°C) currently measured at the Dome A is not the lowest one ever recorded in Antarctica, but the extremely low mean 10 m firn temperature (–58.2°C) indicates very low ground temperature. Given the prominent inversion near the ground, it is expected that Dome A might house the lowest ground temperature on the planet.

关键词：温度分布自动气象站地面气温空气温度观测数据南极洲冰穹积雪

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impacts of Climate Change on snow avalanche Activity Along a Transportation Corridor in the tianshan Mountains

引用

International Journal of Disaster Risk Science 2023年第4期14卷 510-522页

作者： Jiansheng Hao Xueqin Zhang Peng Cui Lanhai Li Yan Wang Guotao Zhang Chaoyue Li Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China China-Pakistan Joint research Center on Earth Sciences Chinese Academy of Sciences-Higher Education Commission of PakistanIslamabad 45320Pakistan State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Ili station for Watershed Ecosystem research Chinese Academy of SciencesXinyuan 835800China

snow avalanches can repeatedly occur along the same track under diferent snowpack and meteorological conditions during the snow season in areas of snow avalanche *** snowfall,air temperature,and snow cover can change dramatically in a warming climate,causing signifcant changes in the snow avalanche *** how the risk of snow avalanche activity during the snow season will change under a warming climate remains an open *** on the observed meteorological and snowpack data from 1968 to 2021 and the snow avalanche activity data during the 2011–2021 snow seasons along a transportation corridor in the central tianshan Mountains that has a typical continental snow climate,we analyzed the temporal distribution of the snow avalanche activity and the impacts of climate change on *** results indicate that the frequency of the snow avalanche activity is characterized by a Gaussian bimodal distribution,resulting from interactions between the snowfall,air temperature,and snowpack *** addition,the active period of wet snow avalanches triggered by temperature surges and high solar radiation has gradually moved forward from the second half to the frst half of March with climate *** frequency and size of snowfall-triggered snow avalanches showed only a slight and insignifcant *** fndings are important for rationally arranging snow avalanche relief resources to improve the risk management of snow avalanche disasters,and highlight the necessity to immediately design risk mitigation strategies and disaster risk policies to improve our adaptation to climate change.

关键词： Climate change Continental snow climate Risk management snow avalanches tianshan mountains

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

snow cover estimation from MODIS and Sentinel-1 SAR data using machine learning algorithms in the western part of the tianshan Mountains

引用

Journal of Mountain Science 2020年第4期17卷 884-897页

作者： LIU Yang CHEN Xi HAO Jian-Sheng LI Lan-hai State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Ili station for Watershed Ecosystem research Chinese Academy of SciencesXinyuan 835800China research Center for Ecology and Environment of Central Asia Chinese Academy of SciencesUrumqi 830011China Xinjiang Regional Center of Resources and Environmental Science Instrument Chinese Academy of SciencesUrumqi 830011China

Obtaining the spatial distribution of snow cover in mountainous areas using the optical image of remote sensing technology is difficult because of cloud and fog. In this study, the object-based principle component analysis–support vector machine(PCA–SVM) method is proposed for snow cover mapping through the integration of moderateresolution imaging spectroradiometer(MODIS) snow cover products and the Sentinel-1 synthetic aperture radar(SAR) scattering characteristics. First, derived from the Sentinel-1 A SAR images, the feature parameters, including VV/VH backscatter, scattering entropy, and scattering alpha, were used to describe the variations of snow and non-snow covers. Second, the optimum feature combinations of snow cover were formed from the feature parameters using the principle component analysis(PCA) algorithm. Finally, using the optimum feature combinations, a snow cover map with a 20 m spatial resolution was extracted by means of an object-based SVM classifier. This method was applied in the study area of the Xinyuan County, which is located in the western part of the tianshan Mountains in Xinjiang, China. The accuracies in this method were analyzed according to the data observed at different experimental sites. Results showed that the snow cover pixels of the extraction were less than those in the actual situation(FB1=93.86, FB2=59.78). The evaluation of the threat score(TS), probability of detection(POD), and false alarm ratio(FAR) for the snow-covered pixels obtained from the two-stage SAR images were different(TS1=86.84, POD1=90.10, FAR1=4.01;TS2=56.40, POD2=57.62, FAR2=3.62). False and misclassifications of the snow cover and non-snow cover pixels were found. Although the classifications were not highly accurate, the approach showed potential for integrating different sources to retrieve the spatial distribution of snow covers during a stable period.

关键词： snow cover Estimation Sentinel-1/2 MODIS Machine learning

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Historical and real-time estimation of snow depth in Eurasia based on multiple passive microwave data

引用

气候变化研究进展:英文版 2023年第4期14卷 537-545页

作者： Li-Yun DAI Li-Juan MA Su-Ping NIE Si-Yu WEI Tao CHE Key Laboratory of Remote Sensing of Gansu Province Heihe Remote Sensing Experimental Research StationNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China National Climate Centre China Meteorological AdministrationBeijing 1000101China University of Chinese Academy of Sciences Beijing 1000101China

Current snow depth datasets demonstrate large discrepancies in the spatial pattern in Eurasia,and the lagging updates of datasets do not meet the operational requirements of the meteorological service *** study developed a dynamic retrieval method for daily snow depth over Eurasia based on cross-sensor calibrated microwave brightness temperatures to enhance retrieval accuracy and meet the requirements of operational *** brightness temperatures were detected by microwave radiometer imager carried on the FengYun 3(FY-3)satellite and the special sensor microwave imager/sounder carried on the USA Defense Meteorological Satellite Program series satellites,which use the fewest sensors to provide the longest data and consequently introduce minimal errors during inter-sensor ***,inter-sensor calibration was conducted amongst brightness temperatures collected by the three sensors.A spatiotemporal dynamic relationship between snow depth and microwave brightness temperature gradient was then established,overcoming the large uncertainties induced by varying snow *** relationship can be utilised in FY-3 satellite data for operational service to obtain real-time snow *** generated daily snow depth dataset from 1988 to 2021 presents similar spatial patterns of snow depth to those observed in *** in situ snow depth,the overall bias and root mean square error are−2.04 and 6.49 cm,respectively,facilitating considerable improvements in accuracy compared with the Advanced Microwave Scanning Radiometer 2 snow depth product,which adopts the static *** analysis shows an overall decreasing trend from 1988 to 2021 for annual and monthly mean snow depths,demonstrating a noticeable reduction since around *** reduction in monthly mean snow depth started earlier in shallow snow months than in deep snow months.

关键词： snow depth Passive microwave remote sensing Eurasia

来源：

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

Intercomparison measurements from commonly used precipitation gauges in the Qilian Mountains

引用

Advances in Climate Change research 2023年第3期14卷 394-405页

作者： Yan-Ni ZHAO Ren-Sheng CHEN Lei WANG Chun-Tan HAN Jian-Ping YANG Qilian Alpine Ecology and Hydrology research station Key Laboratory of Ecological Safety and Sustainable Development in Arid LandsNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China College of Geography and Environment Shandong Normal UniversityJinan 250014China

Precipitation data is vital fundamental data for climate ***,obtaining precise gauge-measured precipitation in high-altitude mountains is challenging,and the precipitation obtained from various gauge types at the same station may *** understand the differences in precipitation observations among the three commonly used gauges in China(Chinese Standard Precipitation Gauges(CSPG),Total Rain weighing Sensor(TRwS),and Geonor T-200B(T200B))in high-altitude mountains and to recommend a stable and cost-effective weighing gauge,a precipitation intercomparison experiment was conducted at Hulu-1 station in the Qilian *** wind-induced error in measurement was corrected with the‘universal’transfer function recommended by the Word Meteorological *** comparison results,adjusted for systematic errors,showed that the rain,snow and mixed precipitation of CSPG and TRwS equipped with the same octagonal vertical double fence shields(CSPGDF and TRwSDF)and single-Alter shields(CSPG_(s)and TRwSs)were close,while the precipitation of Tretyakov-shielded T200B was notably higher than that of CSPG_(s)and *** average differences in annual and daily precipitation between CSPGDF and TRwSDF from 2017 to 2021 were 12.9 mm and 0.10 mm,*** daily precipitation difference between CSPG_(s)and TRwSs from April 2019–December 2021 was 0.10 mm,while the differences between T200Bs and CSPG_(s)and TRwSs was 0.28 mm and 0.38 mm,*** wind shield performance of Alter and Tretyakov was not much different at Hulu-1 site with low wind speed,thus the measurement principle of T200Bs was the primary cause of the high *** the corrected CSPGDF measurement as the standard,the dynamic loss of CSPG_(s)was 17.6%,while that of CSPGUn was 55.6%,indicating that the single-Alter shield could effectively reduce the impact of wind on precipitation *** the comparison results and the price difference of the instruments,it was r

关键词： Precipitation intercomparison experiment Chinese standard precipitation gauge Total rain weighing sensors Geonor T-200B weighing Gauge Qilian mountains

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：