检索结果-南通市图书馆

Quasi-3-yr Cycle of rainy Season Precipitation in Tibet Related to Different Types of ENSO during 1981–2015

Journal of Meteorological Research 2018年第2期32卷 181-190页

作者： Chunxue WANG Zhenfeng MA Climate Center of sichuan province Chengdu 610072 key laboratory of sichuan province for heavy rain and drought-Hood disasters in plateau and basin Chengdu 610072

The rainy season precipitation in Tibet（RSPT） is a direct cause for local floods/droughts. It also indirectly affects the thermal conditions of the Tibetan plateau, which can result in anomalous patterns of atmospheric circulation over East Asia. The interannual variability of the RSPT is often linked with the El Ni？o–Southern Oscillation（ENSO）, but the relevant mechanisms are far from being understood, particularly for different types of ENSO events. We investigated the interannual variation of the RSPT in association with different types of ENSO. A quasi-3-yr period of the RSPT（less–more–more precipitation） was significant at the 95% confidence level. A joint multi-taper method with singular value decomposition analysis of the coupled field between the RSPT and the sea surface temperature（SST）revealed that the developing eastern Pacific type El Ni？o was accompanied by a decrease in the RSPT. The shift from the central Pacific type El Ni？o to the eastern Pacific La Ni？a was accompanied by an increase in the RSPT. Weakening of the central Pacific La Ni？a was accompanied by an increase in the RSPT. Analysis of the mechanism of this coupling, using the same analysis method but other climatic factors, indicated that the gradually strengthening eastern Pacific El Ni？o can inhibit the Walker circulation, weakening the South Asian summer monsoon, and resulting in transport of less water vapor from the Bay of Bengal to Tibet. The change from the central Pacific El Ni？o to the eastern Pacific La Ni？a led to continued strengthening of the Walker circulation with westward movement of the ascending area. This enhanced the South Asian summer monsoon over the Arabian Sea and transported more water vapor to Tibet. The decreasing central Pacific La Ni？a accompanied by persistent cooling of SSTs in the equatorial Pacific led to a strong eastern North Pacific summer monsoon, causing an anomaly in the easterly transport of water vapor from the Sea of Japan to Tibet and increased RSPT

关键词： Tibet multi-taper method with singular value decomposition E1 Nifio-Southern Oscillation period

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 Cotton Yield in China from 1961 to2010 Based on Provincial Data

引用

Journal of Meteorological Research 2015年第3期29卷 515-524页

作者：陈超庞艳梅潘学标张立祯 Institute of plateau Meteorology China Meteorological Administration heavy rain and drought-flood disasters in plateau and basin key laboratory of sichuan province College of Resources and Environment China Agricultural University

To develop scientific countermeasures, the impacts of climate change on cotton yield during 1961-2010 in three major cotton-producing regions of China were studied by using the available provincial data. The results indicate that （1） a rise in average temperature increased the cotton yield in most provinces of Northwest China and the Yellow River valley; however, the rise in average temperature decreased the cotton yield in the Yangtze River valley. Moreover, cotton production across the entire study region was reduced by approximately 0.1% relative to the average during 1961-2010. （2） A decrease in diurnal temperature range （DTR） reduced cotton yield in some provinces, while a beneficial DTR effect was observed in the other provinces. Changes in DTR resulted in an average decrease in production by approximatly 5.5% across the entire study region. （3） A change in the amount of precipitation increased the cotton yield in some provinces; however, it caused a decrease in other provinces. The decrease in average production due to the change in precipitation was approximately 1.1%. We concluded that the changes in temperature and precipitation decreased cotton yields in China, while beneficial effects of temperature and precipitation existed in the cotton-growing regions of Northwest China during 1961-2010.

关键词： climate change impact cotton yield provincial data China temperature precipitation

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

An Interdecadal Change of Summer Atmospheric Circulation over Asian Mid-High Latitudes and Associated Effects

引用

Journal of Tropical Meteorology 2020年第3期26卷 363-376页

作者： ZHOU Chang-yan LI Di REN Qian QI Dong-mei Institute of plateau Meteorology China Meteorological Administration/Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan ProvinceChengdu 610072 China

The atmospheric circulation over the mid-high latitudes in Asia has an important influence on regional climate,yet its long-term variation has not been fully *** main task of this study is to reveal the interdecadal variation features of summer atmospheric circulation over Asian mid-high latitudes in recent *** results show that the atmospheric circulation over mid-high latitudes of Asia has stronger interdecadal fluctuations than that over low latitudes and one significant change center appears near Lake *** is found that the atmospheric circulation near Lake Baikal has a significant interdecadal change around 1996 and a deep anomalous anticyclonic circulation has been controlling this region since then,which contributes to the significant increase in the surface temperature near Lake Baikal since 1997 and makes the region a remarkable warming center in Asia in recent 40 *** 1997-2015,the pattern of less precipitation in the north and more precipitation in the south of east China is closely related to the anomalous anticyclonic circulation near Lake ***,this anomalous circulation near Lake Baikal has been found to contribute to the obvious interdecadal decrease of the precipitation in northeast China and north China *** sea surface temperature(SST)of northwestern Atlantic is an important influence factor to the interdecadal change in the atmospheric circulation near Lake Baikal around 1996.

关键词： Asian mid-high latitudes interdecadal change effect Atlantic SST

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

Evaluation of CMPAS precipitation products over sichuan,China

引用

Atmospheric and Oceanic Science Letters 2022年第2期15卷 47-53页

作者： Shiying Li Xiaolong Huang Wei Wu Bing Du Yuhe Jiang sichuan Meteorological Observation and Data Center Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan ProvinceChengduChina

High-quality and high-resolution precipitation data are the basis for mesoscale numerical weather forecasting,model verification,and hydrological monitoring,which play an important role in meteorological and hydrological disaster prevention and *** this study,high-density rain gauge data are used to evaluate the fusion accuracy of the China Meteorological Administration Multisource Precipitation Analysis System(CMPAS),and four CMPAS products with different spatial and temporal resolution and different data sources are compared,to derive the applicability of *** show that all the CMPAS products show high accuracy in the sichuan basin,followed by Panxi Area and the western sichuan *** errors of the four products all rise with the increase in *** overestimates precipitation in summer and autumn and underestimates it in spring and ***,the applicability of these fused data in the sichuan basin is quite *** to the lack of observations and the influence of the terrain and meteorological conditions,the evaluation of CMPAS in the plateau area needs further analysis.

关键词： Multisource precipitation products High-resolution precipitation CMPAS Applicability assessment

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

Global rainstorm Disaster Risk Monitoring Based on Satellite Remote Sensing

引用

Journal of Meteorological Research 2022年第1期36卷 193-207页

作者： Suling REN Xiuzhen HAN Jun YANG Shihao TANG Yang ZHANG Tianchan SHAN Cheng LIU National Satellite Meteorological Center China Meteorological AdministrationBeijing 100081 heavy rain and drought-flood disasters in plateau and basin key laboratory of sichuan province Chengdu 610072

Methods of rainstorm disaster risk monitoring(RDRM)based on retrieved satellite rainfall data are *** to significant regional differences,the global rainstorm disasters are not only affected by geography(such as topography and surface properties),but also by climate *** is necessary to study rainstorm disaster-causing factors,hazard-formative environments,and hazard-affected incidents based on the climate distribution of precipitation and rainstorms *** to a global flood disaster dataset for the last 20 years,the top four flood disaster causes(accounting for 96.8%in total)related to rainstorms,from most to least influential,are heavy rain(accounting for 61.6%),brief torrential rain(16.7%),monsoonal rain(9.4%),and tropical cyclone/storm rain(9.1%).A dynamic global rainstorm disaster threshold is identified by using global climate data based on 3319 rainstorm-induced floods and rainfall data retrieved by satellites in the last 20 *** the 7-day accumulated rainfall,3-and 12-h maximum rainfall,24-h rainfall,rainstorm threshold,and others as the main parameters,a rainstorm intensity index is *** and global mapping of hazard-formative environmental factor and hazard-affected body factor of rainstorm disasters are performed based on terrain and river data,population data,and economic ***,a satellite remote sensing RDRM model is developed,incorporating the above three factors(rainstorm intensity index,hazard-formative environment factor,and hazard-affected body factor).The results show that the model can well capture the rainstorm disasters that happened in the middle and lower reaches of the Yangtze River in China and in South Asia in 2020.

关键词： satellite-retrieved precipitation flood rainstorm disaster risk monitoring rainstorm disaster risk index

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

Correction of CMPAS Precipitation Products over Complex Terrain Areas with Machine Learning Models

引用

Journal of Tropical Meteorology 2023年第2期29卷 264-276页

作者：李施颖黄晓龙吴薇杜冰蒋雨荷 sichuan Meteorological Observation and Data Center Chengdu 610072 China heavy rain and drought-flood disasters in plateau and basin key laboratory of sichuan province Chengdu 610072 China

Machine learning models were used to improve the accuracy of China Meteorological Administration Multisource Precipitation Analysis System(CMPAS)in complex terrain areas by combining rain gauge precipitation with topographic factors like altitude,slope,slope direction,slope variability,surface roughness,and meteorological factors like temperature and wind *** results of the correction demonstrated that the ensemble learning method has a considerably corrective effect and the three methods(Random Forest,AdaBoost,and Bagging)adopted in the study had similar *** mean bias between CMPAS and 85%of automatic weather stations has dropped by more than 30%.The plateau region displays the largest accuracy increase,the winter season shows the greatest error reduction,and decreasing precipitation improves the correction ***,the heavy precipitation process’precision has improved to some *** individual stations,the revised CMPAS error fluctuation range is significantly reduced.

关键词： machine learning models ensemble learning precipitation correction error correction high-resolution precipitation complex terrain

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

Variations of extreme temperature in the Mount Qomolangma region in China during 1971-2020

引用

Journal of Mountain Science 2023年第12期20卷 3488-3499页

作者： WANG Shun-jiu sichuan Provincial Climate Centre Chengdu 610072China Institute of plateau Meteorological China Meteorological AdministrationChengdu 610072China heavy rain and drought-flood disasters in plateau and basin key laboratory of sichuan province Chengdu 610072China

According to observational daily temperature data from the meteorological stations during 1971-2020,the variations of the extreme temperature event in the Mount Qomolangma(also known as Mount Everest) region in China have been analyzed using statistical *** extreme temperature indices recommended by the World Meteorological Organization are selected to describe the extreme temperature *** RClimDEX 1.0 software is used to calculate the extreme temperature *** are no tropical nights,and just three summer days at the last 50 *** frost days are the main extreme temperature events all year *** temperature in the north slope is more extreme than that in the south slope of the Mount *** is remarkable decadal variation for the extreme temperature indices except diurnal temperature *** are the warm extremes increasing,however,the cold extremes decreasing with the decadal lapse,which is more remarkable into the 21^(th) *** tendencies for the extreme temperature indices in the north slope are consistent with those in the south *** are statistically significant trends for most extreme temperature indices during the study *** shows that the warm extremes would be more prominent in the future with the global continued *** abrupt changes of the extreme temperature index have occurred mainly in the 20^(th) century especially from the mid to late 1980s and *** periodic changes in the south slope do not synchronize those in the north slope for the most extreme temperature *** is different for most extreme temperature indices between the south and north slope,which has demonstrated that the regional or local changes are not neglectable for extreme temperature *** results of this study are also the consistent response of extreme temperature event to the global warming.

关键词： Extreme temperature Variation Trend Statistical analysis Mount Qomolangma Mount Everest

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

Analysis of the Characteristics of Inertia-Gravity Waves during an Orographic Precipitation Event

引用

Advances in Atmospheric Sciences 2018年第5期35卷 604-620页

作者： Lu LIU Lingkun RAN Shouting GAO State key laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China Institute of Atmosphere Physics Chinese Academy Sciences Beijing 100029 China heavy rain and drought-flood disasters in plateau and basin key laboratory of sichuan province Chengdu 610072 China plateau Atmosphere and Environment key laboratory of sichuan province Sichuan 610103 China

A numerical experiment was performed using the Weather Research and Forecasting（WRF） model to analyze the generation and propagation of inertia-gravity waves during an orographic rainstorm that occurred in the sichuan area on 17 August 2014. To examine the spatial and temporal structures of the inertia-gravity waves and identify the wave types, three wavenumber-frequency spectral analysis methods（Fourier analysis, cross-spectral analysis, and wavelet cross-spectrum analysis）were applied. During the storm, inertia-gravity waves appeared at heights of 10-14 km, with periods of 80-100 min and wavelengths of 40-50 km. These waves were generated over a mountain and propagated eastward at an average speed of 15-20 m s^（-1）. Meanwhile, comparison between the reconstructed inertia-gravity waves and accumulated precipitation showed there was a mutual promotion process between them. The Richardson number and Scorer parameter were used to demonstrate that the eastward-moving inertia-gravity waves were trapped in an effective atmospheric ducting zone with favorable reflector and critical level conditions, which were the primary causes of the long lives of the waves. Finally, numerical experiments to test the sensitivity to terrain and diabatic heating were conducted, and the results suggested a cooperative effect of terrain and diabatic heating contributed to the propagation and enhancement of the waves.

关键词： inertia-gravity waves orographic precipitation Fourier analysis wavelet cross-spectrum analysis

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

Characteristics and future projections of summer extreme precipitation in sichuan province, China

引用

Journal of Mountain Science 2020年第7期17卷 1696-1711页

作者： YANG Xian-yu ZHANG Shao-bo LYU Ya-qiong ZHAO Yong LYU Shi-hua plateau Atmosphere and Environment key laboratory of sichuan province School of Atmospheric SciencesChengdu University of Information TechnologyChengdu610225China heavy rain and drought-flood disasters in plateau and basin key laboratory of sichuan province Meteorological Bureau of Sichuan ProvinceChengdu610447China Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu610041China

Based on the precipitation data observed by stations and data simulated by 23 CMIP5 models,the features and future changes of summer(Jun-JulAug)extreme precipitation events in sichuan province of China were *** found that the total precipitation(RSum),extreme precipitation threshold(Threshold90),extreme precipitation(TR90),extreme precipitation percentage(TR90 pct)and extreme precipitation intensity(TR90 str)decreased from the southeast to the northwest in sichuan province,reflecting the differences between eastern sichuan(ESC,basins)and western sichuan(WSC,mountains).Compared with the observations,most of the CMIP5 models showed that there were wet biases in WSC and an unclear bias pattern in ESC for the RSum,Threshold90,TR90,and TR90 ***,the extreme precipitation days(ND90)and TR90 pct values simulated by the models were generally overestimated and underestimated,*** with the historical period,most models showed obvious increases in the TR90 and TR90 pct in the 21 century,while the characteristics of Rsum,ND90,and TR90 str were *** with the mid-21 st century,the extreme precipitation in the late-21 st century exhibited a certain degree of *** during the same period,the results of RCP8.5 were higher than those of RCP4.5,especially for the ND90,TR90,and TR90 pct.

关键词： Extreme precipitation Precip Nation threshold CMIP5 Representative concentration pathways

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

Vegetation Index Reconstruction and Linkage with drought for the Source Region of the Yangtze River Based on Tree-ring Data

引用

Chinese Geographical Science 2021年第4期31卷 684-695页

作者： LI Jinjian WANG Shu QIN Ningsheng LIU Xisheng JIN Liya School of Atmospheric Sciences Plateau Atmosphere and Environment Key Laboratory of Sichuan ProvinceChengdu University of Information TechnologyChengdu 610225China Institute of plateau Meteorology China Meteorological AdministrationChengdu/Heavy Rain and Drought-Flood Disasters in Plateau and BasinKey Laboratory of Sichuan ProvinceChengdu 610072China Hydrology and Water Resources Bureau of Qinghai province Xining 810000China

Variations in vegetation are closely related to climate change, but understanding of their characteristics and causes remains limited. As a typical semi-humid and semi-arid cold plateau region, it is important to understand the knowledge of long term Normalized Difference Vegetation Index(NDVI) variations and find the potential causes in the source region of the Yangtze River. Based on four tree-ring width chronologies, the regional mean NDVI for July and August spanning the period 1665–2013 was reconstructed using a regression model, and it explained 43.9% of the total variance during the period 1981–2013. In decadal, the reconstructed NDVI showed eight growth stages(1754–1764, 1766–1783, 1794–1811, 1828–1838, 1843–1855, 1862–1873, 1897–1909, and 1932–1945)and four degradation stages(1679–1698, 1726–1753, 1910–1923, and 1988–2000). And based on wavelet analysis, significant cycles of2–3 yr and 3–8 yr were identified. In additional, there was a significant positive correlation between the NDVI and the Palmer drought Severity Index(PDSI) during the past 349 yr, and they were mainly in phase. However, according to the results of correlation analysis between different grades of drought/wet and NDVI, there was significant asymmetry in extreme drought years and extreme wet years. In extreme drought years, NDVI was positively correlated with PDSI, and in extreme wet years they were negatively correlated.

关键词： Normalized Difference Vegetation Index(NDVI) reconstruction dendrochronology tree ring Source Region of the Yangtze River

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

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：