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Geoscience Frontiers 2023年第5期14卷 91-107页

作者： Miruo Lin Kelai Xi Yingchang Cao Rukai Zhu Xiaobing Niu Honggang Xin Weijiao Ma Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao 266580China Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China PetroChina Changqing Oilfield Company Xi’an 700018China

The formation mechanism of micron-to centimeter-scale sedimentary cycles in lacustrine shales is a hot topic of research,because these small-scale sedimentary cycles significantly influence shale-oil distribution heterogeneity.High-frequency paleoenvironmental evolution is an important controlling factor for the formation of small-scale sedimentary cycles.However,the driving factors of high-frequency paleoenvironmental evolution and the formation process of sedimentary cycles under its constraint remain speculative.In this study,which focuses on lacustrine shales,we find that the alternating deposition of variable thickness of organic-rich lamina(ORL)and silty-grained felsic lamina(SSFL)form sedimentary cycles on the micron to centimeter scale in the Chang 73 sub-member of the Yanchang Formation in the Ordos Basin.Based on detailed petrographic characterization,in-situ geochemical parameter testing,and high-resolution cycle analysis,the formation process of cyclical sedimentary records and related paleoenvironmental evolution are investigated.Three solar activity cycles were identified from the shales,namely the 360–500 yr,81–110 yr,and 30–57 yr cycles(cycles I,II,and III,respectively).Highfrequency paleoenvironmental evolution caused by solar activity induced lake-level fluctuation,which further controlled silty-grained sediment deposition and organic matter preservation in deep lake areas.Cycle I controlled relatively long-term lake-level fluctuation,driving several pairs of SSFL and ORL deposition at the centimeter scale.Cycles II and III were short-term cycles and acted on the millimeter to micrometer scale,further complicating the sedimentary strata forming during the period of lake-level fall induced by cycle I.The cyclic deposition of SSFL and ORL correspond to cycle III.Lake-level fluctuation influenced by cycle II mainly caused SSFL thickness variation in each lamina couplet.During the period of lake-level rise induced by cycle I,periods of lake level rise during cycles II,and III show cyclic variation i

关键词： Triassic Lacustrine shales solar activity Lake-level fluctuation Shale-oil exploration

Semiannual oscillation,annual oscillation,quasibiennial oscillation,and solar cycle variation of the OH airglow emission in the mesopause region

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Earth and Planetary Physics 2024年第3期8卷 479-496页

作者： Sheng-Yang Gu Dong Wang YuSong Qin Liang Tang YaFei Wei XianKang Dou Electronic Information School Wuhan UniversityWuhan 430072China School of Optoelectronic Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China

The vertically integrated emission rate,centroid altitude,peak emission rate,and peak height of the hydroxyl(OH)airglow were calculated from Thermosphere Ionosphere Mesosphere Energetics and Dynamics(TIMED)/Sounding of the Atmosphere using Broadband Emission Radiometry(SABER)observations to study the seasonal and interannual variations in the intensity and location of the OH emission.The emission rate is inversely proportional to the height of the emission,with the semiannual oscillation dominating at low latitudes and the annual oscillation dominating at higher latitudes.The OH emission is modulated by the quasibiennial oscillation at the equator,and the quasibiennial oscillation signal is weak at other latitudes.We represented the vertical transport of atomic oxygen by using atomic oxygen concentrations obtained from a global atmospheric model,the Specified Dynamics Whole Atmosphere Community Climate Model with thermosphere and ionosphere eXtension simulations.Compared with the amplitudes of the migrating diurnal tide(DW1)calculated from temperature data observed by TIMED/SABER,we found that both the vertical transport of atomic oxygen and DW1 amplitudes in the equatorial region exhibit semiannual oscillation and quasibiennial oscillation,which have a strong correlation with the variations in the amplitude and phase of semiannual oscillation and quasibiennial oscillation in OH emission.It is likely that the DW1 affects the vertical transport of atomic oxygen that is involved in the reaction to produce O3,thus affecting the OH emission.We analyzed the relationship between OH emission and solar activity by using the solar radio flux at 10.7 cm as a proxy for solar activity.The results showed that the OH emission is well correlated with solar activity,and the modulation of OH emission by solar activity has a significant latitudinal variation.The small correlation between emission height and solar activity indicates that solar activity modulates OH emission mainly through chemical rather than dynamic processes.

关键词： OH airglow semiannual oscillation quasibiennial oscillation solar activity diurnal tide

Comparative analysis of extreme ultraviolet solar radiation proxies during minimum activity levels

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Earth and Planetary Physics 2023年第5期7卷 540-547页

作者： A.G.Elias C.R.Martinis B.F.de Haro Barbas F.D.Medina B.S.Zossi M.Fagre T.Duran Laboratorio de Ionosfera Atmosfera Neutra y MagnetosferaFacultad de Ciencias Exactas y Tecnologia(FACET)Universidad Nacional de Tucuman(UNT)Tucuman 4000Argentina Instituto de Física del Noroeste Argentino Consejo Nacional de Investigaciones Cientificas y Tecnicas(CONICET)-UNTTucuman 4000Argentina Center for Space Physics Astronomy DepartmentBoston UniversityMA 02215USA CONICET Tucuman 4000Argentina Laboratorio de Telecomunicaciones Departamento de ElectricidadElectrónica y ComputaciónFACETUNTTucuman4000Argentina Departamento de Física Universidad Nacional del Sur(UNS)Bahia Blanca 8000Argentina Instituto de Física del Sur CONICET-UNSBahia Blanca 8000Argentina

Four extreme ultraviolet(EUV)solar radiation proxies(Magnesium II core-to-wing ratio(MgII),Lymanαflux(Fα),10.7-cm solar radio flux(F10.7),and sunspot number(Rz))were analyzed during the last four consecutive solar activity minima to investigate how they differ during minimum periods and how well they represent solar EUV radiation.Their variability within each minimum and between minima was compared by considering monthly means.A comparison was also made of their role in filtering the effect of solar activity from the critical frequency of the ionospheric F2 layer,foF2,which at mid to low latitudes depends mainly on EUV solar radiation.The last two solar cycles showed unusually low EUV radiation levels according to the four proxies.Regarding the connection between the EUV“true”variation and that of solar proxies,according to the foF2 filtering analysis,MgII and Fαbehaved in a more stable and suitable way,whereas Rz and F10.7 could be overestimating EUV levels during the last two minima,implying they would both underestimate the inter-minima difference of EUV when compared with the first two minima.

关键词： solar EUV radiation solar minimum foF2 solar activity solar EUV proxy

Interdecadal and decadal variation of temperature over North Pole area and the relation with solar activity

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Acta Oceanologica Sinica 2011年第2期30卷 53-61页

作者： QU Weizheng ZHAO Jinping DU Ling HUANG Fei FAN Tingting OceanUniversityofChina Qingdao266003China

Obvious tendency and periodicity of the air temperature can be detected over the North Pole area.They are reflected as follows： a.the air temperature at the earth surface and in the middle layer of the stratosphere tends to be increased either in winter or in summer.The air temperature has increased 1.3 °C for about 50 years at a speed about 0.025 °C/year in January,and 0.013 °C/year in July.The air temperature in the middle layer of the stratosphere （10 hPa） in January has increased 10 °C.The temperature rising speed in July is 0.14 °C/year.Generally speaking,the temperature rising speed is quicker in winter than in summer and quicker in the upper layer than at the earth surface.b.The air temperature at the top layer of the troposphere （100 hPa） over the North Pole area tends to be increased either in winter or in summer.The air temperature in January has decreased 5.0 °C for about 50 years at a temperature decreasing speed about 0.094 °C/year,and at a temperature decreasing speed about 0.032 °C/year in July.The speed of the temperature decreasing is greater in winter than in summer.c.Periodicity.The air temperature respectively at different altitudes over the North Pole possesses interdecadal variation with a period of 22 years.In July the amplitude of the variation with a period of 22 years decreases rapidly from the high altitude to the low.This means that the 22–year’s period is more obvious at the high altitude than at the low altitude.At the earth surface layer in North Pole there also is obvious decadal variation with a period of 11 years.The analysis indicates that the 22-years’ period temperature variation is associated with the periodic variation of the solar magnetic field.The 11-year period temperature variation is corresponding to 11 year’ period of the variation of the sunspot number.

关键词： decadal variation of air temperature solar activity North Pole area

Summer Monsoon Rainfall Variability in Central China over the Past 4700 Years and Its Possible Link to solar activity

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Journal of Meteorological Research 2021年第4期35卷 594-606页

作者： Jingwei ZHANG Kan ZHAO Xinggong KONG Yongjin WANG Xianfang WANG Shushuang LIU Zhenjun WANG Hai CHENG R.Lawrence EDWARDS School of Geography and Environment Jiangxi Normal UniversityNanchang 330022China School of Geography Science Nanjing Normal UniversityNanjing 210023China Key Laboratory ofPoyang LakeWetland and Watershed Research of Ministry of Education Jiangxi Normal UniversityNanchang 330022China Lanling NO.4 Middle School Linyi 277700China Institute of Global Environmental Change Xi'an Jiaotong UniversityXi'an 710049China Department of Geology and Geophysics University of MinnesotaMinneapolis MN55455USA

Based on 467 pairs ofδ^(18)O andδ^(13)C records and 8230 Th dates from a stalagmite(BF4)from Xiniu Cave,central China,we present a reconstruction of 9-yr resolution monsoon rainfall record for the past 4700 years.Ourδ^(18)O record shows good coherence with East Asian summer monsoon(EASM)rainfall proxies from adjacent regions during the overlapping intervals,suggesting thatδ^(18)O signal in BF4 can be interpreted as a monsoon rainfall proxy.Theδ^(13) C variations are related to changes in local processes at the cave site,and regional rainfall and temperature changes.Based on theδ18 O record,a series of dry periods can be identified at 4500-4200,3500-3200,2800-2500,1900-1600,1400-1200,700-500,and 400-200 yr BP,while a series of wet periods can be identified at 4200-3600,2400-2200,3200-2800,1100-900,600-400,and 200-100 yr BP.Power spectrum analysis on ourδ^(18) O record reveals significant cycles at 470 and 80 yr,coinciding with the typical solar periodic variations.This result suggests that changes in solar activity play a dominant role in driving centennial-decadal monsoon rainfall variation in central China.Due to minor changes in solar irradiance(less than 1.5 W m^(-2))over the past 4700 years,our record was further compared to the El Nino-Southern Oscillation(ENSO)and Pacific Decadal Oscillation(PDO)proxies,confirming that solar forcing on monsoon rainfall changes might be amplified by the ENSO and PDO variations.From 600 to 150 yr BP(the Little Ice Age,LIA),a positive shift of 2‰can be revealed in both theδ^(18)O andδ^(13)C records,indicating a cold/dry climatic pattern.By comparing ourδ^(18)O andδ^(13)C records with historical documents,we suggest that the climatic deteriorations between 450 and 250 yr BP may have caused serious social unrest at the end of the Ming Dynasty.

关键词： stalagmite record Xiniu Cave solar activity El Nino-Southern Oscillation(ENSO) Pacific Decadal Oscillation(PDO) amplify mechanism Little Ice Age(LIA)

Investigation of a Possible Link between solar activity and Climate Change in Saudi Arabia: Rainfall Patterns

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大气和气候科学(英文) 2023年第4期13卷 478-490页

作者： Abdullrahman H. Maghrabi Hadeel A. Alamoudi Aied S. Alruhaili National Centre for Applied Physics King Abdulaziz City for Science and Technology Riyadh Saudi Arabia Astronomy and Space Science Department King Abdulaziz University Jeddah Saudi Arabia

In this study, annual, quarterly, and monthly mean precipitation data in Saudi Arabia were correlated with sunspot number (SSN) and galactic cosmic ray (CR) flux over 35 years (1985-2019). The results show that the strength, magnitude, proportion and statistical significance of the relationship between precipitation and the two variables varied by season and month. We find that mean annual precipitation in Saudi Arabia, from May to November, and summer and autumn are correlated with cosmic rays and inversely correlated with SSN. Correlations of varying intensities and scales were found during the remaining months and during winter and spring. The relationships between the rainfall and SSN and CR for each solar cycle were investigated and showed that for all three cycles, the annual rainfall over Saudi Arabia has a positive correlation with CR. Different results were obtained when the seasonal rainfall data correlated with the SSNs and CRs during each cycle. The results obtained, in terms of their strength and magnitude, are affected by terrestrial and extra-terrestrial factors. These factors have been briefly presented and discussed. These findings represent a step towards understanding the possible role of solar activity in climate change for future meteorological phenomenon forecasting, even if the physical mechanism is still poorly quantified.

关键词： Precipitation Cosmic Rays solar activity Climate Change Sunspot Saudi Arabia

Rainfall and Temperature Variations over Burkina Faso: Possible Influence of Geomagnetic activity, solar activity and Associated Energies from 1975 to 2020

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Atmospheric and Climate Sciences 2022年第4期12卷 603-612页

作者： Yacouba Sawadogo Somaïla Koala Jean Louis Zerbo Laboratoire de Matériaux d’Héliophysique et Environnement (La.M.H.E) Université Nazi Boni Bobo-Dioulasso Burkina Faso Unité de Formation et de Recherche en Sciences Exactes et Appliquées (UFR/SEA) Université Nazi Boni Bobo-Dioulasso Burkina Faso

This study investigates climatic parameters (rainfall, and temperature) over Burkina Faso and the possible role of solar activity and its induced energies. Through morphological investigations, we analyzed solar activity indices (sunspot number, IMF, PC index, Cosmic rays) over the last three solar cycles (1975-2020). Results about interplanetary heating show that joule heating is well correlated with the dynamic pressure of the solar plasma. Climate parameters (rainfall, Temperature) variabilities are modulated by disturbances in solar activity: 1) quiet solar characterized by a drop in solar plasma’s parameters is associated with important cloud cover and consequently bring important rainfall which chills terrestrial atmosphere, 2) active solar characterized by important input energy is associated with weak incident cosmic ray consequently with low cloudiness which brings warming. Thus, the possible natural link can be suggested between solar activity and climatic parameters even if it is not the only factor of global warming.

关键词： Temperature Rainfall solar activity Geomagnetic activity Climate Burkina Faso

Response of the Intensity of Subtropical High in the Northern Hemisphere to solar activity

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Advances in Atmospheric Sciences 1993年第3期10卷 325-334页

作者：徐群杨秋明 Jiangsu Meteorological Institute Nanjing 210008 Jiangsu Meteorological Observatory Nanjing 210008

Using the intensity data of each northern subtropical high measured by monthly 500 hPa height charts for the recent 38 years (1954-1991), we calculate their correlations with the monthly sunspot number and monthly solar radio flux at 10.7 cm wave length, respectively. Through strict test, we further confirm a series of high correlations. Next, using a method called the non-integer (year) wave, the significant response of each subtropical high's intensity to solar activity at its main period of 10.9-year length is found. Special attention is paid to that of the eastern Pacific high, the possible mechanism of such sensible response is also analysed.

关键词： solar activity solar constant Intensity of subtropical high

Interdecadal correlation of solar activity with Tibetan Plateau snow depth and winter atmospheric circulation in East Asia

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Research in Cold and Arid Regions 2016年第6期8卷 524-535页

作者： ZhiCai Li Yan Song Wei Zhang Jing Zhang ZiNiu Xiao Shanxi Climate Centre Taiyuan Shanxi 030006 China China Meteorological Administration Training Centre Beijing 100081 China Fang Shan District Meteorological Service Beijing 102488 China Zoology and Agricultural Meteorological Centre of Shenyang Meteorological Administration Shenyang Liaoning 110168 China Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

Studies on the impact of solar activity on climate system are very important in understanding global climate change. Previous studies in this field were mostly focus on temperature, wind and geopotential height. In this paper, interdecadal correlations of solar activity with Winter Snow Depth Index （WSDI） over the Tibetan Plateau, Arctic Oscillation Index （AOI） and the East Asian Winter Monsoon Index （EAWMI） are detected respectively by using solar Radio Flux （SRF）, Total solar Irradiance （TSI） and solar Sunspot Number （SSN） data and statistical methods. Arctic Oscillation and East Asian winter monsoon are typical modes of the East Asian atmospheric circulation. Research results show that on inter-decadal time scale over 11-year solar cycle, the sun modulated changes of winter snow depth over the Tibetan Plateau and East Asian atmospheric circulation. At the fourth lag year, the correlation coefficient of SRF and snow depth is 0.8013 at 0.05 significance level by Monte-Carlo test method. Our study also shows that winter snow depth over the Tibetan Plateau has significant lead and lag correlations with Arctic Oscillation and the East Asian winter monsoon on long time scale. With more snow in winter, the phase of Arctic Oscillation is positive, and East Asian winter monsoon is weak, while with less snow, the parameters are reversed. An example is the winter of 2012/2013, with decreased Tibetan Plateau snow, phase of Arctic Oscillation was negative, and East Asian winter monsoon was strong.

关键词： solar activity interdecadal correlation analysis snow depth over the Tibetan Plateau Arctic Oscillation （AO） East Asian Winter Monsoon