基于2012 年夏季野外考察、微粒粒度测试和扫描电镜(SEM-EDX) 微观形貌观测研究, 对位于我国青藏高原东北缘的祁连山西段典型极大陆型冰川区老虎沟12 号冰川、野牛沟十一冰川积雪中大气粉尘沉积进行了分析研究。两冰川区积雪中微粒的平均质量浓度分别是3461 μg/kg、2876 μg/kg, 年均沉积通量分别是207.6 μg/cm2、143.8 μg/cm2。将本研究区与其他区域冰川积雪中粉尘浓度对比研究表明, 冰川受周边粉尘源区影响较大。雪坑微粒浓度剖面和离子相关性分析表明, 祁连山西段冰川积雪中污化层富含亚洲粉尘的富Ca2+、Na+矿物;微粒体积—粒径分布众数介于3~22 μm, 两冰川区的粒径众数分别为12.6 μm和12 μm, 粒径分布均显示了单结构模式, 同时反映了祁连山冰川区与毗邻的天山地区雪冰中粉尘粒径分布模式的相似性和粒径众数的差异性。通过SEM-EDX对粉尘颗粒的微观结构研究发现, 颗粒绝大多数为形貌不规则的矿物粉尘颗粒, 和很少数量的飞灰颗粒等。同时, 对粉尘来源结合Sr-Nd同位素测定和气团后向轨迹分析进行验证, 认为位于研究区北边的巴丹吉林沙漠是祁连山12号冰川区粉尘最可能的源区。
[1] Osada K, Hajime I, Mizuka K M et al. Mineral dust layers in snow at Mount Tateyama, central Japan: Formationprocesses and characteristics. Tellus, 2004, 56B: 382-392.
[2] Liu Chunping, Yao Tandong, Thompson L G et al. Microparticle concentration within the Dunde ice core and itsrelationship with dust storm and climate. Journal of Glaciology and Geocryology, 1999, 21(1): 9-14. [刘纯平, 姚檀栋,Thompson L G等. 敦德冰芯中微粒含量与沙尘暴及气候的关系. 冰川冻土, 1999, 21(1): 9-14.]
[3] Liu Chunping, Yao Tandong, Xie Shucheng. Characteristics of microparticle variation and record of atmosphericenvironment in Dunde ice. Journal of Glaciology and Geocryology, 1999, 19(3): 105-113. [刘纯平, 姚檀栋, 谢树成. 祁连山敦德冰芯微粒变化特征和大气环境记录. 海洋地质与第四纪地质, 1999, 19(3): 105-113.]
[4] Zdanowicz′ C M, Zielinski G A, Wake C P et al. Characteristics of modern atmospheric dust deposition in snow on thePenny Ice Cap, Baffin Island, Arctic Canada. Tellus, 1998, 50B: 506-520.
[5] Prospero J M, Ginoux P, Torres O et al. Environmental charatierization of global sources of atmospheric soli dustidentified with the nimbus 7 total ozone mapping spectrometer (TOMS) absorbing aerosol product. Reviews ofGeophysics, 2002, 40 (1): 4-1-4-30.
[6] Gao Y, Arimoto R M, Zhou Y et al. Relationships between the dust concentrations over Eastern Asia and the remoteNorth Pacific. Journal of Geophysical Research, 1992, 97, D9: 9867-9872.
[7] Thompson E M, Thompson L G. Glaciological interpretation of the microparticle concentration in the 905-meter DomeC core. Antarctic Journal of the Unite States, 1980, 11: 71-75.
[8] John T M, Mitsuo U. Meteorological analysis of long range transport of mineral aerosols over the North Pacific.Journal of Geophysical Research, 1989, 94, D6: 8584-8598.
[9] Oerlemans J, Anderson B, Hubbard A et al. Modeling the response of glaciers to climate warming. Climate Dynamics,1998, 4: 267-274.
[10] Prospero J M, Uematsu M, Savoie D L. Marine aerosol transport to the Pacific Ocean. Chemical Oceanography, 1989,10: 188-218.
[11] Thompson L G, Thompson E M, Davis M E et al. Holocene-Late Pleistocene climatic ice core records fromQinghai-Tibetan Plateau. Science, 1989, 246: 474-477.
[12] Steffensen J P. The size distributions of microparticle from selected segments of the Greenland Ice Core Project icecore representing different climatic periods. Journal of Geophysical Research, 1997, 102(C12): 26755-26763.
[13] Thompson L G, Wayne L. Climatological implications of microparticle concentrations in the ice core from "Byrd"station, Western Antarctica. Journal of Glaciology, 1975, 14(72): 433-444.
[14] Thompson L G, Thompson E M. Microparticle concentration variations linked with climatic change: Evidence frompolar ice cores. Science, 1981, 212: 812-816.
[15] Thompson L G, Thompson E M. A 25,000-year tropical climate history from Bolivian ice cores. Science, 1998, 282:1858-1864.
[16] Uematsu M, Duce R A, Prospero J M et al. Transport of mineral aerosol from Asia over the North Pacific Ocean.Journal of Geophysical Research, 1983, 88: 5343-5352.
[17] Wake C P, Mayewski P A, Li Z et al. Modern eolian dust deposition in central Asia. Tellus, 1994, 46B: 220-223.
[18] Wang S, Gong D, Zhu J. Twentieth-century climatic warming in China in the context of the Holocene. The Holocene,2001, 11(3): 313-321.
[19] Wu Guangjian, Yao Tandong. Progress in studies on insoluble microparticle in ice cores. Journal of Glaciology and Geocryology, 2005, 27(4): 528-538. [邬光剑, 姚檀栋. 冰芯中不溶微粒的研究进展. 冰川冻土, 2005, 27(4): 528-538.]
[20] Zhang X L, Wu G J, Yao T D et al. Characterization of individual fly ash particles in surface snow at Urumqi GlacierNo.1, Eastern Tianshan. Chinese Science Bulletin, 2011, 56: 3464-3473, doi: 10.1007/s11434-011-4684-8.
[21] Xu J, Yu G, Kang S et al. Sr-Nd isotope evidence for modern aeolian dust sources in mountain glaciers of westernChina. Journal of Glaciology, 2012, 58(211): 859-865, doi: 10.3189/2012JoG12J006.
[22] Zhu Yuman, Li Zhongqin, You Xiaoni. Application and technique in glacier by Accusizer 780A optical particle sizer.Modern Science Apparatus, 2006, (3): 81-84. [朱宇漫, 李忠勤, 尤晓妮. 利用光学粒径检测仪测定雪冰样品中的微粒. 现代科学仪器, 2006, (3): 81-84.]
[23] Li Z, Edwards R, Thompson E M et al. Seasonal variability of ionic concentrations in surface snow and elutionprocesses in snow-firn packs at the PGPI site on Urumqi Glacier No.1, eastern Tien Shan, China. Annals ofGlaciology, 2006, 43: 250-256.
[24] Dong Zhiwen, Li Zhongqin, Wang Feiteng et al. Characteristics of modern atmospheric dust deposition in snow on theglaciers of east Tianshan Mountains, China. Acta Geographica Sinica, 2008, 63(5): 544-552. [董志文, 李忠勤, 王飞腾等. 天山东部冰川积雪中大气粉尘的沉积特征. 地理学报, 2008, 63(5): 544-552.]
[25] Cong Z Y, Kang S C, Dong S P et al. Elemental and individual particle analysis of atmospheric aerosols from highHimalayas. Environmental Monitoring and Assessment, 2010, 160: 323-335.
[26] Xu J, Hou S, Chen F et al. Tracing the sources of particles in the East Rongbuk ice core from Mt. Qomolangma.Chinese Science Bulletin, 2009, 54, doi: 10.1007/s11434-009-0050-5.
[27] Dong Z W, Li Z Q. Characteristics of atmospheric dust deposition in snow on Glacier No.72, Mt Tuomuer, China.Arctic, Antarctic, and Alpine Research, 2011, 43(4): 517-526.
[28] Wu G, Zhang C, Zhang X et al. Sr and Nd isotopic composition of dust in Dunde ice core, northern China:Implications for source tracing and use as an analogue of long-range transported Asian dust. Earth and PlanetaryScience Letters, 2010, 299: 409-416.
[29] Chen J, Li G J, Yang J D et al. Nd and Sr isotopic characteristics of Chinese deserts: Implications for the provenancesof Asian dust. Geochimica et Cosmochimica Acta, 2007, 71: 3904-3914.