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| 1 | Brown carbon in the cryosphere: Current knowledge and perspective显示文摘Recently, the light-absorbing organic carbon, i.e., brown carbon(Br C), has received an increasing attention, because they could significantly absorb the solar radiation in the range of short wavelengths rather than the purely scattering effect. Br C is ubiquitous in the troposphere. It could undergo long range transport within the atmospheric circulation. After the deposition on the surface of snow or ice in the cryospheric region, as the major light absorbing impurities with black carbon and dust, Br C could reduce the snow albedo and accelerate the glacier melting. In this context, this paper summarized the current knowledge of Br C(in aerosols and snow) in the cryospheric regions including the Arctic, Antarctic,and Alpines. Although some works have been conducted in those region, the current dataset on the optical properties of Br C like Absorption?ngstr€om Exponent(AAE) and Mass Absorption Efficiency(MAE) is still limited, which hampers stimulating an accurate evaluation of its climate effects. Especially in the Himalayas and Tibetan Plateau, where very limited information concerning Br C is available. Considering biomass burning as a dominant source of Br C, a large amount of emissions from biomass burning in South Asia could reach the Himalayas and Tibetan Plateau, where the climate effect of Br C merits more investigation in the future. | WU Guang-Ming CONG Zhi-Yuan KANG Shi-Chang Kimitaka KAWAMURA FU Ping-Qing ZHANG Yu-Lan WAN Xin GAO Shao-Peng LIU Bin | 2016 | Advances in Climate Change Research2016，7，1： | 4 |
| 2 | Seasonal changes in TC and WSOC and their ^13C isotope ratios in Northeast Asian aerosols: land surface–biosphere–atmosphere interactions显示文摘In order to understand the relative importance of anthropogenic and biological sources of carbonaceous aerosols in Northeast Asia,we measured total carbon(TC)and water-soluble organic carbon(WSOC)and their stable carbon isotope ratios(d^(13)C)in total suspended particulates collected from Sapporo,northern Japan(43.07°N,141.36°E)over a 1-year period(during 2 September 2009and 5 October 2010).Temporal variations of TC showed a gradual decrease from mid-autumn to winter followed by a gradual increase to growing season with a peak in early summer.Both d^(13)C_(TC)and d^(13)C_(WSOC)showed very similar temporal trends with a gradual enrichment of^(13)C from mid-autumn to winter followed by a depletion in the^(13)C to early summer and thereafter it remained stable,except for few cases.Based on the results obtained together with the air mass trajectories,we found that biogenic emissions including biological particles(e.g.,pollen)and secondary organic aerosol formation from biogenic volatile organic compounds are the important sources of carbonaceous aerosols in spring/summer whereas fungal spores from soil and biomass burning and enhanced fossil fuel combustion contribute significantly in autumn/winter and in winter,respectively,in Northeast Asia. | Chandra Mouli Pavuluri Kimitaka Kawamura | 2017 | Acta Geochimica2017，36，3： | 2 |
| 3 | 北极Alert地区有机气溶胶的分子组成及来源贡献显示文摘北极地区大气气溶胶的来源及有机分子组成的研究相对较少。本文通过采集Alert地区从冬季到夏季的气溶胶样品,利用气相色谱仪以及气相色谱-质谱(GC-MS)联用仪研究其有机分子组成及季节性变化趋势。结果表明,所检测到的有机化合物总浓度范围为18.3~109ng m-3,其中二元酸的浓度最高。α-蒎烯来源的二次有机碳(SOC)含量高于β-石竹烯来源的SOC;它们比异戊二烯来源的SOC高数倍。SOC明显高于生物质燃烧和真菌孢子来源的有机碳。本研究表明,北极地区气溶胶的分子组成与中低纬度地区有显著差异;并且,夏季北冰洋向大气释放有机质的贡献也不能被忽视。 | 傅平青 KAWAMURA Kimitaka | 2013 | 矿物岩石地球化学通报2013，32，4： | 2 |
| 4 | Homologous series of C1I - C10 monocarboxylic acids and C1 - C6 carbonyls in Los Angeles air and motor vehicle exhausts 显示文摘 | Kimitaka Kawamura Spencer Steinberg Isaac R Kaplan | 2000 | Atmosph Environ2000，34，： | 1 |
| 5 | Distributions of low molecular weight dicarboxylic acids in the North Pacific aerosol samples显示文摘 | Kimitaka Kawamura Kouichi Usukura | 1993 | Journal of Oceanography1993，，3： | 1 |
| 6 | Molecular, seasonal, and spatial distributions of organic aerosols from fourteen Chinese cities 显示文摘 | Wang Gehui Kawamura Kimitaka Lee Shuncheng | 2006 | Environmental Science and Technology2006，40，15： | 1 |
| 7 | Molecular composition and size distribution of sugars, sugar-alcohols and carboxylic acids in airborne particles during a severe urban haze event caused by wheat straw burning显示文摘 | Gehui Wang Chunlei Chen Jianjun Li Bianhong Zhou Mingjie Xie Shuyuan Hu Kimitaka Kawamura Yan Chen | 2011 | Atmospheric Environment2011，，15： | 1 |
| 8 | Paleoenvironmental significance of compound- specific δ^13 C variations in n-alkanes in the Hongyuan peat sequence from southwest China over the last 13 ka 显示文摘 | Shinya Yamamoto Kimitaka Kawamura Osamu Seki | 2010 | Organic Geochemistry2010，41，： | 1 |
| 9 | High abundance of low molecular weight organic acids in hypersaline spring water associated with a salt diaper显示文摘 | Kimitaka Kawamura Arie Nissenbaum | 1992 | Organic Geochemistry1992，18，4： | 1 |
| 10 | Seasonal variations of sugars in atmospheric particulate matter from Gosan, Jeju Island: Significant contributions of airborne pollen and Asian dust in spring显示文摘 | Pingqing Fu Kimitaka Kawamura Minoru Kobayashi Bernd R.T. Simoneit | 2012 | Atmospheric Environment2012，，： | 1 |
| 11 | 广州市城区站点冬季PM2.5时间变化及碳氮同位素组成特征显示文摘于2018年冬季在广州城区磨碟沙站点开展细颗粒物(PM_(2.5))样品采集,并获得PM_(2.5)中水溶性离子、含碳组分、稳定碳氮同位素的组成及时间变化特征,重点讨论了PM_(2.5)浓度升高时段的化学组成特征变化,进而利用稳定碳氮同位素变化特征探究了主要污染来源。结果表明:采样期间,研究站点PM_(2.5)平均质量浓度为22.1μg/m^(3),共出现两个PM_(2.5)浓度水平升高时段,所对应的平均质量浓度分别达46.0μg/m^(3)和63.0μg/m^(3)。风速降低、温度升高等不利气象条件是导致上述时段PM_(2.5)浓度上升的重要原因。在上述时段,伴随着PM_(2.5)浓度的升高,NO_(3)^(-)和NH_(4)^(+)浓度均出现显著升高,NO_(3)^(-)与SO_(4)^(2-)的摩尔质量比(NO_(3)^(-)/SO_(4)^(2-))同时出现高值,表明当地PM_(2.5)浓度主要受到机动车排放的影响。研究发现,伴随着PM_(2.5)浓度的升高,稳定氮同位素比值(δ15 N)显著升高,而稳定碳同位素比值(δ^(13) C)则出现降低。δ^(13) C与NH_(4)^(+)、NO_(3)^(-)、NO_(3)^(-)/SO_(4)^(2-)之间均呈现显著的负相关关系,说明机动车排放对δ^(13) C有重要影响。硝酸盐氮(NO_(3)^(-)-N)和铵盐氮(NH_(4)^(+)-N)表现出与δ15 N相似的变化趋势。其中,NH_(4)^(+)对总氮(TN)的贡献为46%,高于NO_(3)^(-)对TN的贡献(36%)。在PM_(2.5)浓度升高时段,NH_(4)^(+)/SO_(4)^(2-)表现出高值,NO_(3)^(-)也出现浓度高值,表明PM_(2.5)中富含铵盐,并进一步证明机动车排放对PM_(2.5)污染贡献较大。 | 史璐涵 张颖仪 KUNWAR Bhagawati DESHMUKH Dhananjay Kumar KAWAMURA Kimitaka 岳玎利 赵燕 赖森潮 | 2023 | 中国环境监测2023，39，1： | 0 |
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