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| 1 | Annual temperatures during the last 2485 years in the mid-eastern Tibetan Plateau inferred from tree rings显示文摘By combining living trees and archaeological wood, the annual mean temperatures were reconstructed based on ring-width indices of the mid-eastern Tibetan Plateau for the past 2485 years. The climate variations revealed by the reconstruction indicate that there were four periods to have average tem- peratures similar to or even higher than that mean of 1970 to 2000 AD. A particularly notable rapid shift from cold to warm, we call it the 'Eastern Jin Event', occurred from 348 AD to 413 AD. Calculation re- sults show that the temperature variations over the mid-eastern Tibetan Plateau are not only repre- sentative for large parts of north-central China, but also closely correspond to those of the entire Northern Hemisphere over long time scales. During the last 2485 years, the downfall of most major dynasties in China coincides with intervals of low temperature. Compared with the temperature records in other regions of China during the last 1000 years, this reconstruction from the Tibetan Plateau shows a significant warming trend after the 1950s. | Hans W. LINDERHOLM | 2009 | Science China Earth Sciences2009，52，3： | 62 |
| 2 | Interannual and Decadal Variations of Snow Cover overQinghai-Xizang Plateau and Their Relationships to Summer Monsoon Rainfall in China显示文摘Interannual and decadal variations of winter snow cover over the Qinghai-Xizang Plateau (QXP) are analyzed by using monthly mean snow depth data set of 60 stations over QXP for the period of 1958 through 1992. It is found that the winter snow cover over QXP bears a pronounced quasi-biennial oscillation. and it underwent an obvious decadal transition from a poor snow cover period to a rich snow cover period in the late 1970’s during the last 40 years. It is shown that the summer rainfall in the eastern China is closely associated with the winter snow cover over QXP not only in the interannual variation but also in the decadal variation. A clear relationship exists in the quasi-biennial oscillation between the summer rainfall in the northern part of North China and the southern China and the winter snow cover over QXP. Furthermore, the summer rainfall in the four climate divisions of Qinling-Daba Mountains, the Yangtze-Huaihe River Plain, the upper and lower reaches of the Yangtze River showed a remarkable transition from drought period to rainy period in the end of 1970’s, in good correspondence with the decadal transition of the winter snow cover over QXP. | 陈烈庭 吴仁广 | 2000 | Advances in Atmospheric Sciences2000，17，1： | 50 |
| 3 | Decadal climatic variations recorded in Guliya ice core and comparison with the historical documentary data from East China during the last 2000 years显示文摘The high-resolution records of δ18O and snow accumulation variations from the Guliya ice core provide valuable data for research on climatic variations at a decadal resolution during the past 2000 years in China. Based on the ice core data, five spells have been divided: the warm and wet period before 270 AD, the cold and dry period between 280 and 970 AD, the moderate and dry period between 970 and 1510 AD, the well-defined' Little Ice Age 'with drastic cold-warm fluctuations between 1510 and 1930 AD and the warming period since 1930 AD. According to the combination of temperature and precipitation, cold events (55 times) surpass warm ones (26 times), and dry events (55 times) surpass wet ones (45 times). Cold-wet events (14 times) are less than cold-dry ones (16 times), while warmwet events (10 times) are more than warm-dry ones (4 times). If the difference of 2‰ in δ18O (corresponding to 3K in temperature) between two or three adjacent decades is taken as the criterion of it, the abrupt | 施雅风 姚檀栋 杨保 | 1999 | Science China Earth Sciences1999，42，S1： | 31 |
| 4 | Interannual and Decadal Changes in Tropospheric Ozone in China and the Associated Chemistry–Climate Interactions: A Review显示文摘China has been experiencing widespread air pollution due to rapid industrialization and urbanization in recent decades.The two major concerns of ambient air quality in China are particulate matter(PM)and tropospheric ozone(O3).With the implementation of air pollution prevention and control actions in the last five years,the PM pollution in China has been substantially reduced.In contrast,under the conditions of the urban air pollution complex,the elevated O3 levels in city clusters of eastern China,especially in warm seasons,have drawn increasing attention.Emissions of air pollutants and their precursors not only contribute to regional air quality,but also alter climate.Climate change in turn can change chemical processes,long-range transport,and local meteorology that influence air pollution.Compared to PM,less is known about O3 pollution and its climate effects over China.Here,we present a review of the main findings from the literature over the period 2011-18 with regard to the characteristics of O3 concentrations in China and the mechanisms that drive its interannual to decadal variations,aiming to identify robust conclusions that may guide decision-making for emissions control and to highlight critical knowledge gaps.We also review regional and global modeling studies that have investigated the impacts of tropospheric O3 on climate,as well as the projections of future tropospheric O3 owing to climate and/or emission changes. | Yu FU Hong LIAO Yang YANG | 2019 | Advances in Atmospheric Sciences2019，36，9： | 27 |
| 5 | Relationship and its instability of ENSO--Chinese variations in droughts and wet spells显示文摘Monthly data of Self-Calibrated Palmer Drought Severity Index (PDSI) from 1951 to 2000 are calculated using historical precipitation and temperature data for Chinese 160 stations. Temporal and spatial pat-terns of the first empirical orthogonal function (EOF) of the PDSI reveals a fairly linear trend resulting from trends in precipitation and surface temperature, which is similar to the linear PDSI trend during 1951―2000 calculated using all monthly data. The EOF analysis also reveals that the leading mode correlates significantly with ENSO events in time and space. The ENSO EOF shows that during the typical warm phase of ENSO, surface conditions are drier in most regions of China, especially North China, but wetter than normal in the southern regions of Changjiang River, and Northwest China. During the typical cold phase of ENSO, these anomalies reverse sign. From 1951 to 2000, there are large multi-year to decadal variations in droughts and wet spells over China, which are all closely related to strong El Nio events. In other words, when one strong El Nio event happens, there is a possible big variability in droughts and wet spells over China on the multi-year or decadal scale. Studies also sug-gest that during the last 2―3 decades climate changes over China, especially North China's drying and northwest China's wetting, are closely related to the shift in ENSO towards warmer events and global warming since the late 1970s. The instability of the relationship is also studied. It is revealed that there is a good correlation between ENSO and Chinese variations in droughts and wet spells in the 3―8-year band, but the correlation between ENSO and Chinese variations in droughts and wet spells is instable. Studies suggest that there are decadal changes in the correlation: the wavelet coherency between ENSO and Chinese variations in droughts and wet spells is high during 1951―1962 and 1976―1991, but low during 1963―1975 and 1992―2000. | SU MingFeng1,2 & WANG HuiJun1 1 Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China 2 Graduate University of Chinese Academy of Sciences, Beijing 100039, China | 2007 | Science China Earth Sciences2007，50，1： | 24 |
| 6 | Seasonal variation in surface ozone and its regional characteristics at global atmosphere watch stations in China显示文摘We investigated the seasonal and spatial ozone variations in China by using three-year surface ozone observation data from the six Chinese Global Atmosphere Watch(GAW)stations and tropospheric column ozone data from satellite retrieval over the period2010–2012. It is shown that the seasonal ozone variations at these GAW stations are rather different, particularly between the western and eastern locations. Compared with western China, eastern China has lower background ozone levels. However, the Asian summer monsoon(ASM) can transport photochemical pollutants from the southern to the northern areas in eastern China, leading to a northward gradual enhancement of background ozone levels at the eastern GAW stations. Over China, the tropospheric column ozone densities peak during spring and summer in the areas that are directly and/or indirectly affected by the ASM, and the peak time lags from the south to the north in eastern China. We also investigated the regional representativeness of seasonal variations of ozone at the six Chinese GAW stations using the yearly maximum tropospheric column month as indicator.The results show that the seasonal variation characteristics of ozone revealed by the Chinese GAW stations are typical, with each station having a considerable large surrounding area with the ozone maximum occurring at the same month. Ozone variations at the GAW stations are influenced by many complex factors and their regional representativeness needs to be investigated further in a broader sense. | Ningwei Liu Weili Lin Jianzhong Ma Wanyun Xu Xiaobin Xu | 2019 | Journal of Environmental Sciences2019，31，3： | 23 |
| 7 | Reliability of geomagnetic secular variations recorded in a loess section at Lingtai, north-central China显示文摘An investigation of the rock magnetic properties using stepwise isothermal remanence (IRM) acquisition, thermomagnetic analysis and temperature-dependent susceptibility history, identifies magnetite as the carrier of the main fraction of the remanence, associated with maghemite and hematite in Malan loess (L1), Holocene soil (SO) and last-glacial paleosol (S1). The presence of short-lived direction fluctuations indicates that no significant smoothing occurs in L1 when its remanence is locked, and thus L1 is capable of recording the geomagnetic secular variation (PSV), while the PSV has been severely smoothed or wiped out by pedogenic processes during S1 formation. It has been suggested that the Mono Lake and Laschamp excursions are two independent geomagnetic events based on this study. | 朱日祥 郭斌 潘永信 刘青松 A.Zeman V.Suchy | 2000 | Science China Earth Sciences2000，43，1： | 13 |
| 8 | Influence of atmospheric heat sources over the Tibetan Plateau and the tropical western North Pacific on the inter-decadal variations of the stratosphere-troposphere exchange of water vapor显示文摘This study investigates the Stratosphere-Troposphere Exchange(STE) of water vapor,emphasizes its interdecadal variations over Asia in boreal summer,and discusses the influences of atmospheric heat sources over the Tibetan Plateau and the tropical western North Pacific(WNP) on them by using the Wei method with reanalysis data from the European Centre for Medium-Range Weather Forecasts(ECMWF) for the years of 1958-2001.The climatology shows that the upward transport of water vapor across the tropopause in boreal summer is the most robust over the joining area of the South Asian Peninsula and Indian-Pacific Oceans(defined as AIPO).The upward transport over there can persistently convey the abundant water vapor into the stratosphere and then influence the distribution and variation of the stratospheric water vapor.The analysis shows that interdecadal variations of the water vapor exchange over the AIPO are significant,and its abrupt change occurred in the mid-1970s and the early 1990s.In these three periods,as important channels of the water vapor exchange,the effect of Bay of Bengal-East Asia as well as South China Sea was gradually weakening,while the role of the WNP becomes more and more important.Further studies show that atmospheric heat sources over the Tibetan Plateau and the WNP are two main factors in determining the interdecadal variations of water vapor exchange.The thermal influences over the Tibetan Plateau and the WNP have been greatly adjusted over the pass 44 years.Their synthesis influences the interdecadal variations of the water vapor exchange by changing the Asian summer monsoon,but their roles vary with time and regions.Especially after 1992,the influence of heat source over the Tibetan Plateau remarkably weakens,while the heat source over the WNP dominates the across-tropopause water vapor exchange.Results have important implications for understanding the transport of other components in the atmosphere and estimating the impact of human activities(emission) on global climate. | ZHAN RuiFen1,2&LI JianPing2 1Shanghai Typhoon Institute of China Meteorological Administration,Shanghai 200030,China 2State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China | 2008 | Science China Earth Sciences2008，51，8： | 11 |
| 9 | Siliceous microplankton fluxes and seasonal variations in the central South China Sea during 1993-1995: monsoon climate and ? Nino responses显示文摘Seasonal variations of radiolarian and diatom fluxes in the central South China Sea during 1993-1995 were overwhelmingly controlled by monsoon climate. Radiolarian and diatom increased obviously during the Northeast (from November to February) and Southwest (from June to September) monsoons and decreased during the periods between the monsoons. The change of circulation driven by the monsoons improved water exchange in the different areas that brought rich nutrient materials for the surface microplankton, thereby enhancing radiolarian and diatom fluxes. Variation of radiolarian flux coincided with organic carbon flux, surface primary and export productivities. High radiolarian flux corresponded to high surface primary productivity. Radiolarian and diatom fluxes raised abnormally during 1994-1995 could be attributed to the El Nino event during the period. | WANG Rujian, LIN Jun, ZHENG Lianfu, CHEN Ronghua & CHEN JianfangLaboratory of Marine Geology of MOE, Tongji University, Shanghai 200092, China The Key Laboratory of Submarine Geoscience, State Oceanic Administration, Hangzhou 310012, China Correspondence should be addressed to Wang Rujian | 2000 | Chinese Science Bulletin2000，45，23： | 10 |
| 10 | Seismogenesis and occurrence of earthquakes as observed by temporally continuous gravity variations in China显示文摘In the last decade and a half, a number of earthquakes of magnitude 4-5 have occurred in the Beijing_Tianjin_Tangshan_Zhangjiakou (BTTZ) region. On the basis of the analysis of the temporally continuous gravity variation data principally from the Baijiatuan (BJTN) semi_permanent gravity base station, a general picture of gravity variation related to the seismogenesis and occurrence of earthquakes has emerged.\;As gravity variation is generally observed on the earth’s surface, the predominant influence is that of the near_surface groundwater. The subsurface fluids are distributed throughout all depths in the crust and respond to the seismogenic processes of earthquakes as well. The influence of the subsurface fluid on gravity variation is, therefore, of equal importance. The fluids, which include the near_surface groundwater and the subsurface fluids distributed throughout all depths in the crust, play a more important role in the gravity variations in terms of the seismogenesis and occurrence of earthquakes than previously realized.\;The abundance of accumulated data shows that the dilatancy instability (IPE) model seems not applicable at least to the seismogenesis and occurrence of earthquakes in the BTTZ region. In order to reflect the physical reality, the earlier proposed combined dilatancy model requires modification. The seismogenic area in the BTTZ region may be modelled as a large pre_stressed volume of a fluid_filled poroelastic medium, including not only the pre_stressed volume surrounding the impending rupture zone but also the volume containing the rupture of the fault zone itself. The pre_stressed volume outside the impending rupture zone is under a state of relatively small change of the pre_existing regional tectonic stress, while the volume containing the impending rupture zone is an induced region of very high local stress concentration, and/or pore over_pressure.\;The calculated gravity variations based on the modified combined dilatancy model (MCDM) with the known physical parameters of the region resemble the observed residual gravity variations. Apparently the residual gravity variations, in addition to responding to the deep_seated seismogenesis and occurrence of earthquakes, predominantly respond to the near_surface groundwater, and the subsurface fluids, which themselves also respond to the seismogenesis and occurrence of earthquakes. On the basis of comparison between the calculated MCDM gravity variations and the observed residual gravity variations, the change of the regional tectonic stress field for the earthquakes of magnitude 4-5 in the BTTZ region could be approximately estimated to be in the neighbourhood of 5%-7%.\;It is apparent that simultaneously monitoring the temporally continuous variations of the near_surface groundwater, subsurface fluids, and gravity coupled with modelling would provide vital information on the history and evolution of the seismogenic processes about 10 months to 1 year prior to the occurrence of an earthquake of magnitude 4-5 and tens of years prior to that of an earthquake of magnitude 7-8 such as the Haicheng earthquake in 1975 and the Tangshan earthquake in 1976 in the BTTZ region. These earthquakes of magnitude 4-5, which so far have occurred in the BTTZ region, may well be the precursory events to a larger earthquake. | Gongxu Gu John T. Kuo Keren Liu Jinhan Zheng Hongyan Lu Duanfa Liu | 1998 | Chinese Science Bulletin1998，43，1： | 10 |
| 11 | Re-Assessing Climatic Warming in China since 1900显示文摘The regional mean surface air temperature(SAT)in China has risen with a rate of 1.3–1.7℃(100 yr)^-1 since 1900,based on the recently developed homogenized observations.This estimate is larger than those[0.5–0.8℃(100 yr)^-1]adopted in the early National Reports of Climate Change in China.The present paper reviews the studies of the longterm SAT series of China,highlighting the homogenization of station observations as the key progress.The SAT series of China in early studies showed a prominent warm peak in the 1940s,mainly due to inhomogeneous records associated with site-moves of a number of stations from urban to outskirts in the early 1950s,thus leading to underestimates of the centennial warming trend.Parts of China were relatively warm around the 1940s but with differentphase interdecadal variations,while some parts were even relatively cool.This fact is supported by proxy data and could partly be explained by interdecadal changes in large-scale circulation.The effect of urbanization should have a minor contribution to the observed warming in China,although the estimates of such contributions for individual urban stations remain controversial.Further studies relevant to the present topic are discussed. | Zhongwei YAN Yihui DING Panmao ZHAI Lianchun SONG Lijuan CAO Zhen LI | 2020 | Journal of Meteorological Research2020，34，2： | 9 |
| 12 | Characteristics of annual laminae gray level variations in a stalagmite from Shihua Cave, Beijing and its climatic significance (II)显示文摘The annual laminae gray level variations in the stalagmite TS9501 of Shihua Cave, Beijing are studied in detail. The environmental factors influencing the laminae gray level are also analyzed. The following conditions may be necessary to the study on the lamina gray level. A) The seasonal differences of climate in the studied area are strong. B) The cave has a rapid and simple hydrological connection with the surface, such that the gray level variation is great; therefore, climatic changes can be more clearly recorded in a stalagmite. C) No water from other sources due to lateral flow adds to the seepage over the cave. D) There are more organic impurities than inorganic ones, whose content changes distinctly with time in the sample. By comparison with the modern instrumental climate records, it was found that the gray level of laminae is mainly related to the air temperature, especially the summer mean temperature. Therefore, the gray level can be used as a proxy of the air temperature. The variation | 秦小光 谭明 刘东生 王先锋 李铁英 吕金波 | 2000 | Science China Earth Sciences2000，43，5： | 9 |
| 13 | ENSO events and interannual variations of winter sea-ice in the Greenland, the Kara and the Barents Seas显示文摘A number of researches show that ENSO is a phenomenon related not only to interannual variations in the tropical atmosphere and ocean, but also to climatic anomalies in the high latitudes. On the one hand, ENSO results in a teleconnection in the middle-high latitudes; on the other hand, the atmospheric circulation anomalies in the middle-high latitudes play an impor- | Wu, BY Gao, DY Huang, RH | 1997 | Chinese Science Bulletin1997，42，16： | 9 |
| 14 | Analysis of the dynamic characteristics and stochastic simulation on variations of beach volumes显示文摘Analysisofthedynamiccharacteristicsandstochasticsimulationonvariationsofbeachvolumes￥ChenZishen(InstituteofEstuarineandCoasta... | Chen Zishen(Institute of Estuarine and Coastal Research of Zhongshan University, Guangzhou 510275, China) | 1995 | Acta Oceanologica Sinica1995，14，3： | 8 |
| 15 | Relationship between the Modes of Winter Tropical Pacific SST Anomalies and the Intraseasonal Variations of the Following Summer Rainfall Anomalies in China显示文摘In present study,EOF analysis and extended singular value decomposition (ESVD) analysis are performed to explore the relationship between the winter tropical sea surface temperature anomalies (SSTAs) in the Pacific and the following summer rainfall anomalies in China.The two leading modes of winter tropical SSTAs in the Pacific are the SSTAs pattern characterized by 'positive anomalies in the East and negative anomalies in the West' like the typical eastern Pacific El Nio and negative anomalies in the West and the central Pacific warming pattern characterized by 'positive anomalies in the central region but negative anomalies in the East and West'.The intraseasonal variations of the rainfall anomalies during the following summer in China that are associated with the eastern Pacific warming mode are characterized by positive anomalies south of the Yangtze River and negative anomalies in the Yangtze-Huai River Valley in June,and negative anomalies in South China and positive anomalies in the Yangtze River Valley and North China in July and August.In contrast,after the central Pacific warming mode,the corresponding intraseasonal variations of China’s summer rainfall are characterized by a nearly consistent pattern during the three summer months,which is positive in the South China coast and North China and negative in the Yangtze River Valley except for the positive anomalies in the Yangtze-Huai River Valley in July.These results may provide a reference for the seasonal prediction of the summer drought and flood distributions in China. | Huang Ping Huang Rong-Hui | 2009 | Atmospheric and Oceanic Science Letters2009，2，5： | 8 |
| 16 | Abrupt variations of the radiolarian fauna at Mid-Pleistocene climate transition in the South China Sea显示文摘Based on a detailed study of the radiolarian fauna, the abundance pattern of planktic foraminifera as well as on isotope and sedimentological records, the Mid-Pleistocene climate transition as a multiple transition phenomenon could be recognized at Core 17957-2 from the South China Sea. Distinct changes in the radiolarian/foraminfera ratio, the coarse fraction and the radiolarian assemblages can be related to the global climate cooling observed at the Mid-Pleistocene revolution (MPR) around 900 ka. A pronounced southward shift of the North Equatorial Current that leads to lower sea-surface temperatures in the South China Sea is documented by the shift of tropical to subtropical radiolarian assemblages at 900 ka. Increasing radiolarian abundance after the MPR can be interpreted as a result of stronger upwelling and nutrient supply. These abrupt variations could result from the northern trade wind system and East Asian monsoon circulation. | Andrea Abelmann | 2000 | Chinese Science Bulletin2000，45，10： | 7 |
| 17 | CHARACTERISTICS OF 10-DAY MEAN SURFACE SENSIBLE HEAT FLUX VARIATIONS IN THE SCS MONSOON REGION AND POSSIBLE CONNECTIONS WITH THE SCS SUMMER MONSOON ONSET显示文摘The time and space variations of the ten-day mean surface sensible heat flux have beenanalyzed in this paper based on the data of NCEP/NCAR from January of 1979 to December of1995 in the South China Sea(SCS)monsoon region.It is found that large variations of the surfacesensible heat flux standard deviations exist in the northwestern Indochina Peninsula and the IndianPeninsula regions,and their locations and strength change significantly during the onset period ofSCS monsoon.The negative deviations appear evidently earlier in the Indocbina Peninsula than inthe Indian Peninsula but the deviation strength in the Indian Peninsula is stronger than that in theIndochina Peninsula.The appearance of the zonal negative mean deviations in the southern part ofthe Indochina Peninsula corresponds to the date of the SCS summer monsoon onset,while theoccurrence of the deviation decrease corresponds to the date of the South Asian monsoon onset.The sensible heat flux increases dekad by dekad before the onset of the summer monsoon in theIndian Peninsula and the Indochina Peninsula and decreases after the monsoon onset.Therefore,the surface sensible heat flux changes in the Indochina and the Indian Peninsula regions maybe havesome connections with the SCS monsoon onset and the Indian monsoon onset,and the IndochinaPeninsula maybe becomes the sensitive or key region to the SCS monsoon onset and the land maybeplays an important role in triggering summer monsoon onset. | 张耀存 钱永甫 | 1999 | Acta meteorologica Sinica1999，13，1： | 7 |
| 18 | 音乐元数据研究现状显示文摘介绍了主要的音乐元数据研究机构和研究项目,分析了有代表性的几种音乐元数据方案,探讨了面向用户的音乐元数据,对研究现状作了总结。 | 韩圣龙 | 2007 | 大学图书馆学报2007，25，2： | 6 |
| 19 | CHARACTERISTICS OF 10-DAY MEAN SURFACE LATENT HEAT FLUX VARIATIONS IN THE SCS MONSOON REGION AND POSSIBLE CONNECTIONS WITH THE SCS SUMMER MONSOON ONSET显示文摘The temporal and spatial variations of the ten-day mean surface latent heat flux (TMLH) havebeen analyzed in this paper based on the data of NCEP from January of 1979 to December of 1995in the South China Sea (SCS) monsoon region. It is found that there exist maximum centers ofTMLH standard deviation in the northwest Indochina and the Indian Peninsula as well as thewestern Pacific, SCS, the Indian Ocean and the Bay of Bengal, and their locations and strengthschange significantly during the period of SCS monsoon onset. A positive zonal deviation of TMLHoccurs first in the Indochina Peninsula, apparently earlier than that in the Indian Peninsula. Theappearance of maximum positive zonal deviations of TMLH approximately coincides with thesummer monsoon onset. Over the Indochina and Indian Peninsulas, the TMLH increases graduallywith a small amplitude of variation before the onset of summer monsoon, and the rate of increase issignificantly enhanced after the onset of the monsoon; whereas over the ocean, TMLH decreasesbefore the monsoon onset, varies little during the period of monsoon and increases gradually afterthe ending of monsoon. Therefore, it seems that the surface latent heat flux plays an importantrole in the maintenance of the summer monsoon, and its variation is an phenomenon accompanyingthe onset of summer monsoon. | 张耀存 钱永甫 | 1999 | Acta meteorologica Sinica1999，13，4： | 6 |
| 20 | Secondary organic aerosols in Jinan, an urban site in North China: Significant anthropogenic contributions to heavy pollution显示文摘Secondary organic aerosols(SOAs) are an important component of particulates, but whether biogenic SOAs(BSOAs) or anthropogenic SOAs(ASOAs) are the dominant contributors to haze pollution remains poorly characterized. In this study, particulate samples were collected from September 2014 to August 2015 at an urban site in Jinan, which is the capital of Shandong Province and a typical city in the North China Plain. The PM2.5 samples were analyzed for BSOA(isoprene(SOAI) and monoterpenes(SOAM)) and ASOA(aromatic(SOAA)) tracers. The concentrations of the SOAAtracer(1.1 ± 1.0 ng/m3) were lowest, and those of SOAItracers(41.8 ± 86.2 ng/m3) were highest, with the concentrations of SOAMtracers(19.4 ± 9.9 ng/m3) being intermediate. The SOAItracers were more abundant in the summer and less abundant in the winter. Both SOAIand SOAMincreased with increasing ozone level but decreased with increasing NOx level. Correlation analysis revealed a good correlation between 2,3-dihydroxy-4-oxopentanoic acid and levoglucosan levels in three seasons. These results suggested that biomass burning activities occurring in the NCP can enhance the emissions of aromatics and should be controlled, especially in the autumn and winter. SOA tracers were classified according to pollution degree, and the results showed that as pollution increases, the contributions of SOAAincrease. These results indicate that reducing anthropogenic emissions is necessary to prevent SOA pollution, especially during heavy pollution episodes. | Yusi Liu Xingru Li Guiqian Tang Lili Wang Bo Lv Xueqing Guo Yuesi Wang | 2019 | Journal of Environmental Sciences2019，31，6： | 6 |
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