|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Interannual variations of dust activity in western Iran and their possible mechanisms显示文摘Through an analysis of station observations and reanalysis data,in this study,we investigate the variations of dust activity during 1979-2015 in western and southwestern Iran and their associated mechanisms.The dust day frequency(DDF)is used to identify dust activities.The results show larger interannual variabilities in the DDF in spring and summer,with standard deviations(σ)of 10%and 13%,respectively.Correlation analyses reveal that the interannual variability of DDF in western Iran is largely regulated by wind speed,precipitation and soil moisture in the region.The regional mean spring(March-May)DDF shows strong negative correlations with spring precipitation(correlation coefficient R=−0.5)and soil moisture(R=−0.6)over western to southwestern Iran,but strong positive correlations between the springtime DDF and surface winds can be found with the R reaching 0.4-0.6.Dust activity in the summer dry season(June-August)is mainly associated with surface winds over southwestern Iran,especially in regions near the Persian Gulf,where the R between the DDF and surface winds reaches 0.5.Meanwhile,the summer DDF also shows strong negative correlations(R<−0.4)with soil moisture of the top layer in the middle to southern part of the region.These results highlight the key roles of wind speed,precipitation and soil moisture in determining the interannual variation of dust activities in western and southwestern Iran. | Alireza Kamal Chenglai Wu Zhaohui Lin | 2020 | Big Earth Data2020，4，2： | 1 |
| 2 | Fractionation mechanism of iron isotopes in highly fractionated granites from the Xinxian Pluton,Western Dabie Orogen,Central China显示文摘Iron isotopes are important for tracing the magmatic process.The fractionation of iron isotopes in granite is up to 0.55‰.In this study,Wangjiagou(XWJ)granite and Tayueping(XTY)granite in the Xinxian pluton of the Western Dabie orogen were evaluated.Both the XTY and XWJ granite belong to monzogranites,with high SiO2(74.42-76.82 wt.%)contents.The granites are depleted of Nb and Ti but enriched with Pb and K,and they display negative Eu anomalies(Eu/Eu^(*)=0.40-0.52)on REE plots that are normalized by chondrite.Theδ^(56)Fe values of the XTY granites vary from 0.19±0.03‰to0.27±0.04‰,and theδ^(56)Fe values of the XWJ granites are 0.34±0.02‰and 0.36±0.01‰,respectively.Both the XTY and the XWJ granites belong to highly fractionated granites due to their SI(solidification index),DI(differentiation index),and content of CaO.Evidence from the iron isotopes shows that neither fluid exsolution,alteration,weathering,nor partial melting can explain the enrichment of the heavy iron isotopes.The results modeled using the Rayleigh equation showed that fractional crystallization can produceΔ^(56)Femelt-crystalwith the value of0.08-0.15‰.In conclusion,fractional crystallization was the main factor controlling the fractionation of iron isotopes,and the change of melt composition may also lead to the enrichment of heavy iron isotopes in the residual melt. | Chenglai Deng Changqing Hu Qiuyu Wen Wenbin Yang Wu Li | 2022 | Acta Geochimica2022，41，6： | 0 |
| 3 | 不同代表性浓度路径情景下2045-2050年中国气溶胶分布变化的分析显示文摘基于来自于CMIP5中CESM模式的三种RCP情景下的气象场的降尺度模拟,应用区域空气质量模式系统RAMSCMAQ模拟2045-2050年中国地区气溶胶浓度.三种RCP情景下气象场的降尺度模拟表明,与RCP2.6相比,在RCP4.5和RCP8.5下,华北和华南的近地表温度差减小,风速在华北和华南地区增加,在中部地区下降.RCP2.6情景下,模拟的2045年到2050年平均的PM_(2.5)浓度在华北平原,长三角的部分地区和四川盆地最高,约为40-50μg m^(-3),在中国中部和珠三角的部分地区约为30-40μg m^(-3).与RCP2.6相比,在RCP4.5和RCP8.5下,PM_(2.5)增加了4-12μg m^(-3),其中在RCP4.5和RCP8.5下,SO_(4)^(2-)和NH_(4+)的浓度增加,在RCP4.5下,NO^(3-)浓度降低,在RCP8.5下,NO^(3-)浓度升高,在RCP4.5和RCP8.5下,BC浓度变化很小,而OC浓度下降,其中在RCP8.5下,西南和东南部分地区的OC有所增加.不同的气溶胶物种浓度在RCP4.5和RCP2.6之间的差异以及RCP8.5和RCP2.6之间的差异具有相似的年度变化,这表明气候变化对不同物种的影响趋于一致. | Yi Gao Meigen Zhang Chenglai Wu | 2021 | Atmospheric and Oceanic Science Letters2021，14，2： | 0 |
| 4 | Comparison of the Anthropogenic Emission Inventory for CMIP6 Models with a Country-Level Inventory over China and the Simulations of the Aerosol Properties显示文摘Anthropogenic emission inventory for aerosols and reactive gases is crucial to the estimation of aerosol radiative forcing and climate effects.Here,the anthropogenic emission inventory for AerChemMIP,endorsed by CMIP6,is briefly introduced.The CMIP6 inventory is compared with a country-level inventory(i.e.,MEIC)over China from 1986 to 2015.Discrepancies are found in the yearly trends of the two inventories,especially after 2006.The yearly trends of the aerosol burdens simulated by CESM2 using the two inventories follow their emission trends and deviate after the mid-2000s,while the simulated aerosol optical depths(AODs)show similar trends.The difference between the simulated AODs is much smaller than the difference between model and observation.Although the simulated AODs agree with the MODIS satellite retrievals for country-wide average,the good agreement is an offset between the underestimation in eastern China and the overestimation in western China.Low-biased precursor gas of SO_(2),overly strong convergence of the wind field,overly strong dilution and transport by summer monsoon circulation,too much wet scavenging by precipitation,and overly weak aerosol swelling due to low-biased relative humidity are suggested to be responsible for the underestimated AOD in eastern China.This indicates that the influence of the emission inventory uncertainties on simulated aerosol properties can be overwhelmed by model biases of meteorology and aerosol processes.It is necessary for climate models to perform reasonably well in the dynamical,physical,and chemical processes that would influence aerosol simulations. | Tianyi FAN Xiaohong LIU Chenglai WU Qiang ZHANG Chuanfeng ZHAO Xin YANG Yanglian LI | 2022 | Advances in Atmospheric Sciences2022，39，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员