检索结果-南通市图书馆

Relationships between the Oxygen Isotopes in East Asian Stalagmites and Large-Scale Atmospheric and Oceanic Modes

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6期7卷 540-545页

作者： JING Yuan-Yuan li shuanglin WAN Jiang-Hua LUO Fei-Fei Institute of Atmospheric Physics Chinese Academy of Sciences College of Atmospheric Sciences Chengdu University of Information Technology

The stalagmite δ18O record is known to be associated with the climate, but the specifics of the relationship remain unclear. It may not represent variation in air temperature or precipitation, but instead reflect integral changes of monsoon circulation, especially water vapor sources(the so-called "circulation effect"). Since large-scale atmospheric-oceanic modes such as the Atlantic Multidecadal Oscillation(AMO), Pacific Decadal Oscillation(PDO), and North Atlantic Oscillation(NAO) exert significant effects on Asian monsoon, in this paper the authors investigate the relationships of the East Asian stalagmite δ18O record with these modes. The last three centuries form the focus of our study, for which the authors use reconstructed as well as instrumental data. Considering the impacts of human activity, our analysis is conducted with respect to two periods—the pre- and post-industrial periods. The results show significant lead-lag connections: a positive correlation peaks when the PDO leads East Asian stalagmite δ18O by 3 years, which is persistent over the past 300 years; while the relationships of the AMO and NAO with the East Asian stalagmite δ18O record show significant differences in the post-industrial relative to the pre-industrial period. This implies that the East Asian stalagmite δ18O record may primarily reflect the PDO signal.

关键词：海洋模式石笋东亚氧同位素大气北大西洋涛动太平洋年代际振荡亚洲季风

A New Method for Predicting the Decadal Component of Global SST

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2012年第6期5卷 521-526页

作者： LUO Fei-Fei li shuanglin GAO Yong-Qi Tore FUREVIK Nansen-Zhu International Research Centre and Climate Change Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Nansen Environmental and Remote Sensing Center/Bjerknes Center for Climate Research Bergen Norway Geophysical Institute and Bjerknes Center for Climate Research University of Bergen Bergen Norway

A simple approach that considers both internal decadal variability and the effect of anthropogenic forcing is developed to predict the decadal components of global sea surface temperatures (SSTs) for the three decades 2011-2040. The internal decadal component is derived by harmonic wave expansion analyses based on the quasiperiodic evolution of the Pacific Decadal Oscillation (PDO) and the Atlantic Multidecadal Oscillation (AMO), as obtained from observational SST datasets. Furthermore, the external decadal component induced by anthropogenic forcing is assessed with a second-order fit based on the ensemble of projected SSTs in the experiments with multiple coupled climate models associated with the third Coupled Model Intercomparison Project (CMIP3) under the Intergovernmental Panels on Climate Change (IPCC) Special Reports on Emissions Scenario (SRES) A1B. A validation for the years from 2002 to 2010 based on a comparison of the predicted and the observed SST and their spatial correlation, as well as the root mean square error (RMSE), suggests that the approach is reasonable overall. In addition, the predicted results over the 50°S-50°N global band, the Indian Ocean, the western Pacific Ocean, the tropical eastern Pacific Ocean, and the North and the South Atlantic Ocean are presented.

关键词：年代际变化 SST 预测分量太平洋年代际振荡海洋表面温度表层海水温度耦合模式

Effect of the Morphology of ZnO Support on the Desulfurization and Regeneration Performance of Ni/ZnO Catalyst

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2019年第2期21卷 35-43页

作者： Kang Lei Wang Haiyan Han Bing li shuanglin Sun Na Yang Zhanxu College of Chemical Engineering China University of Petroleum Qingdao2665555 College of Chemistry Chemical Engineering and Environmental Engineering Liaoning Shihua University Fushun 113001

The Ni/ZnO desulfurization catalyst has been highly valued for its high desulfurization rate and low octane value loss. However, during the process of desulfurization, ZnO is prone to deactivation and the active component Ni is susceptible to agglomeration, which can affect the performance of the catalyst. In order to solve these problems, the modification of ZnO support has been extensively studied. The granular, short rod-shaped and nanowire-structured ZnO were synthesized by controlling the concentration of NaOH, and the desulfurization catalyst was prepared with ZnO serving as the support after loading of metallic Ni. The catalyst was characterized by X-ray diffraction, N2 adsorption-desorption, SEM, TEM and other analytical methods. The desulfurization performance of the catalyst was investigated with n-heptane - thiophene used as model compounds. Test results showed that the morphology and size of ZnO support has great influence on the desulfurization performance of the catalyst. Desulfurization catalyst prepared with nanowire-structured ZnO support has the best desulfurization performance, with its desulfurization rate reaching 98.2%. The result was achieved mainly due to the nanowire structure of ZnO support which could effectively restrain the agglomeration of metallic Ni on the surface and reduce the particle size of the active component of metallic Ni so as to improve its dispersion on the surface of the support. In addition, the nanowire structure can reduce the diffusion resistance of thiophene in the reaction process and provide a channel conducive to sulfur transfer and diffusion, which makes it perform well in the desulphurization reaction process and regeneration process.

关键词： ZnO morphology nanowires desulphurization regeneration

Projecting the Summer Climate of China's Mainland in the Middle 21st Century: Will the Droughts in North China Persist?

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2008年第1期1卷 12-17页

作者： li shuanglin Nansen-Zhu International Research Centre （NZC） Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

Since no consensus has been reached in previous studies about how the summer climate in China will evolve in the first half of the 21st century, this issue is addressed here through sensitivity experiments by forcing an atmospheric general circulation model (AGCM), the Geophysical Fluid Dynamics Laboratory (GFDL)'s Atmospheric Model Version 2.0 (AM2) with projected sea surface temperature (SST) trend. A total of two SST trends from the Intergovernmental Panels on Climate Change (IPCC) Special Report on Emissions Scenario (SRES) A1B are used. The two trends are from two coupled climate system models, the National Center for Atmospheric Research (NCAR) Community Climate System Model Version 3.0 (CCSM3) and the GFDL Climate Model Version 2.0 (CM2), respectively. Results consistently suggest a substantial warming and drying trend over much of China, with a surface air temperature increase of 1.0 2.0 ℃ and a 10% 20% decrease in rainfall. Exceptions are the areas from northwestern China to western North China as well as the southern Tibetan Plateau, which are projected to be wetter with a rainfall anomaly percentage increase of 10% 50%. The drying in eastern North China has not been documented to date but appears to be reasonable. Physically, it is attributed to anomalous northeasterly winds at the rear of a low-level cyclone over the South China Sea, the Philippines and the subtropical western North Pacific. These conditions, which govern the climate of eastern China, are forced by the northward shift of convection over warm waters due to additional warming.

关键词：夏季气候中国 21世纪中期气候学海面温度

大西洋多年代际振荡对冬季乌拉尔山地区季节内变率的影响（英文）

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2018年第6期11卷 445-453页

作者： li shuanglin li Ding CHEN Ying Institute of Atmospheric Physics Chinese Academy of SciencesBeijingChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina Joint Center for Global Change Studies(JCGCS) BeijingChina dShanxi Climate Center Shanxi Provincial Meteorological AdministrationTaiyuanChina Shanxi Climate Center Shanxi Provincial Meteorological AdministrationTaiyuanChina

利用多套再分析资料,结合大气环流模式试验,研究了大西洋海温多年代振荡(AMO)对冬季乌拉尔山地区上空大气季节内变率的影响。结果发现:AMO暖位相增强北大西洋上空大气季节内活动,有利于乌拉尔大气季节内变率大值中心向南移动,使得北部... 详细信息

利用多套再分析资料,结合大气环流模式试验,研究了大西洋海温多年代振荡(AMO)对冬季乌拉尔山地区上空大气季节内变率的影响。结果发现:AMO暖位相增强北大西洋上空大气季节内活动,有利于乌拉尔大气季节内变率大值中心向南移动,使得北部大气季节内活动减弱,而南部增强。相比较而言,AMO暖位相期间乌拉尔山上空强大气季节内活动个例明显少于冷位相期间,但不同位相期间季节内活动的发展演变过程并没有明显差异。机制上,AMO通过在北大西洋上空引起热力异常,影响大气准静止波活动,进而调制乌拉尔季节内变率。

关键词：大西洋多年代振荡(AMO) 调制大气季节内变率大气静止波

The Asymmetric Connection of SST in the Tasman Sea with Respect to the Opposite Phases of ENSO in Austral Summer

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2022年第11期39卷 1897-1913页

作者： Xueqian SUN shuanglin li Stefan liESS Climate Change Research Center(CCRC) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Department of Atmospheric Science/Centre for Severe Weather and Climate and Hydro-geological Hazards China University of GeosciencesWuhan 430074China College of Earth and Planetary Science University of Chinese Academy of SciencesBeijing 100049China Department of Soil Waterand ClimateUniversity of MinnesotaTwin CitiesSt.Paul MN 55108MinnesotaUSA

This study uses linear regression and composite analyses to identify a pronounced asymmetric connection of sea surface temperature(SST)in the Tasman Sea with the two opposite phases of El Ni?o-Southern Oscillation(ENSO)during austral summer.In El Ni?o years,the SST anomalies(SSTAs)in the Tasman Sea exhibit a dipolar pattern with weak warmth in the northwest and modest cooling in the southeast,while during La Ni?a years the SSTAs exhibit a basin-scale warmth with greater amplitude.Investigations into the underlying mechanism suggest that this asymmetry arises from a mechanism related to oceanic heat transport,specifically the anomalous Ekman meridional heat transport induced by the zonal wind stress anomalies,rather than the surface heat fluxes on the air-sea interface.Further analysis reveals that the asymmetry of oceanic heat transport between El Ni?o and La Ni?a years is driven by the asymmetric atmospheric circulation over the Tasman Sea stimulated by the asymmetric diabatic heating in the tropical Pacific between the two opposite ENSO phases.

关键词： El Ni?o-Southern Oscillation SST in the Tasman Sea asymmetric connection surface heat fluxes oceanic heat transport

A New Approach for Classifying Two Types of El Nio Events

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2012年第5期5卷 414-419页

作者： li shuanglin WANG Qin Nansen-Zhu International Research Centre and Climate Change Research Center Institute of Atmospheric Physics Chinese Acad-. emy of Sciences Beijing 100029 China Chengdu University of lnformation Technology Chengdu 610225 China

In recent decades, the typical El Nio events with the warmest SSTs in the tropical eastern Pacific have become less common, and a different of El Nio with the warmest SSTs in the central Pacific, which is flanked on the east and west by cooler SSTs, has become more fre-quent. The more recent type of El Nio was referred to as central Pacific El Nio, warm pool El Nio, or dateline El Nio, or the El Nio Modoki. Central Pacific El Nio links to a different tropical-to-extratropical teleconnection and exerts different impacts on climate, and several classification approaches have been proposed. In this study, a new classification approach is proposed, which is based on the linear combination (sum or difference) of the two leading Empirical Orthogonal Functions (EOFs) of tropical Pacific Ocean sea surface temperature anomaly (SSTA), and the typical El Ni o index (TENI) and the central El Nio index (CENI) are able to be derived by projecting the observed SSTA onto these combinations. This classification not only reflects the characteristics of non-orthogonality between the two types of events but also yields one period peaking at approximate two to seven years. In particular, this classification can distin-guish the different impacts of the two types of events on rainfall in the following summer in East China. The typical El Nio events tend to induce intensified rainfall in the Yangtze River valley, whereas the central Pacific El Nio tends to induce intensified rainfall in the Huaihe River valley. Thus, the present approach may be appropriate for studying the impact of different types of El Nio on the East Asian climate.

关键词：分类方法类型事件太平洋海温热带太平洋 El 表层海水温度经验正交函数

A Review of Seasonal Climate Prediction Research in China

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2015年第2期32卷 149-168页

作者： WANG Huijun FAN Ke SUN Jianqi li shuanglin liN Zhaohui ZHOU Guangqing CHEN lijuan LANG Xianmei li Fang ZHU Yali CHEN Hong ZHENG Fei Nansen-Zhu International Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Climate Change Research Center Chinese Academy of Sciences Institute of Atmospheric Physics Chinese Academy of Sciences National Climate Center China Meteorological Administration

The ultimate goal of climate research is to produce climate predictions on various time scales. In China, efforts to predict the climate started in the 1930 s. Experimental operational climate forecasts have been performed since the late 1950 s,based on historical analog circulation patterns. However, due to the inherent complexity of climate variability, the forecasts produced at that time were fairly inaccurate. Only from the late 1980 s has seasonal climate prediction experienced substantial progress, when the Tropical Ocean and Global Atmosphere project of the World Climate Research program（WCRP） was launched. This paper, following a brief description of the history of seasonal climate prediction research, provides an overview of these studies in China. Processes and factors associated with the climate variability and predictability are discussed based on the literature published by Chinese scientists. These studies in China mirror aspects of the climate research effort made in other parts of the world over the past several decades, and are particularly associated with monsoon research in East Asia. As the climate warms, climate extremes, their frequency, and intensity are projected to change, with a large possibility that they will increase. Thus, seasonal climate prediction is even more important for China in order to effectively mitigate disasters produced by climate extremes, such as frequent floods, droughts, and the heavy frozen rain events of South China.

关键词： seasonal prediction,climate variability,predictability

The Combined Effects of the Tropical and Extratropical Quasi-biweekly Oscillations on the Record-setting Mei-yu Rainfall in the Summer of 2020

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2023年第4期40卷 663-681,I0002-I0014页

作者： Zhen HUANG shuanglin li Jianying li Chao ZHANG Department of Atmospheric Science/Centre for Severe Weather and Climate and Hydro-geological Hazards China University of GeosciencesWuhan 430074China China Climate Change Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Severe Weather(LASW) Chinese Academy of Meteorological SciencesBeijing 100081China

During June-July 2020,the strongest recorded mei-yu rainfall occurred in the middle and lower reaches of the Yangtze River.The rainfall processes exhibited an obvious quasi-biweekly(biweekly in brief)variability,and there are altogether five cycles.It is found that the biweekly rainfall cycle mainly arises from the collaborative effects of biweekly variabilities from both the tropics and extratropics.As for the tropics,the biweekly meridional march and retreat of the western Pacific subtropical high(WPSH)is particularly evident.As for the extratropics,geopotential height anomalies near Lake Baikal are active.The former is attributed to the intensified biweekly activity of the southwest-northeast oriented EastAsian Pacific wave train(EAP)originating from the tropical western Pacific,while the latter is associated with the biweekly activities of the eastward propagating Eurasia mid-high latitudinal wave train and the westward propagating North Pacific wave train.Why the biweekly activities of these wave trains intensified is further diagnosed from the perspective of thermodynamical forcing and also from the modulation of interannual background on intraseasonal variability.It is found that the strongest recorded convection anchoring over the tropical western Indian Ocean(IO)triggers anomalous descent over the tropical western Pacific,which modulates the biweekly activity of the EAP.Meanwhile,the anomalous diabatic heating over the IO causes changes of the meridional thermodynamic contrast across the IO to the high latitudes,which modulates the extratropical wave trains.A further diagnosis of barotropic kinetic energy conversion suggests that the active occurrence of two extratropical biweekly wave trains is attributed to the increased efficiency of energy conversion from basic flow.The westward propagation of the extratropical North Pacific wave train is attributed to the weakened and northshifted upper-level westerly,which is caused by the SST warmth near the Kuroshio extension.

关键词： strongest recorded mei-yu rainfall in summer 2020 quasi-biweekly variability tropical convection westward propagation of the extratropical North Pacific wave train SSTA in the North Pacific