海洋风尘沉积的古气候学研究进展  

RESEARCH PROGRESS OF MARINE EOLIAN DEPOSITION ON PALEOCLIMATOLOGY

作　　者：万世明[1] 李安春[1] 

机构地区：[1]中国科学院海洋研究所

出　　处：《地球科学进展》2004年第6期955-962,共8页Advances in Earth Science

基　　金：国家自然科学基金重大项目"东亚古季风的海洋记录"之"南海沉积作用与环境演变"(编号:49732060)资助.

摘　　要：海洋风尘沉积是一门海洋沉积学、古气候学、古海洋学的交叉学科,它在古气候、古环境和现代环境研究方面均具有重要意义。总结了近20年来国内外海洋风尘沉积研究领域的成就和进展,重点论述了其研究方法、手段和理论的进展,特别是化学分离石英在提取海洋风尘沉积组分中的应用,以及海洋风尘沉积在古气候学等方面的研究理论和取得的认识。阐明了风尘通量与源区干旱度、风尘粒度与风力强度以及它们与冰期旋回、米兰科维奇(Milankovitch)轨道参数旋回之间复杂的非线性关系。最后指出了该领域还存在的一些问题,并简要展望了未来的研究方向。Marine eolian deposition is a cross subject among marine sedimentation, paleoclimate and paleoceanography, and it's important in the research of paleoclimate, paleoenvironment and modern environment. This paper summarized the international research progress of marine eolian deposition in the past 20 years and put emphases on the progress of methods and theory, especially the application of chemical isolation of quartz minerals from bulk samples of marine sediment and the understanding of the paleoclimatic record provided by eolian deposition in the deep sea. There has been much discussion about the connection between eolian flux and the aridity of the eolian source region, eolian grain size and wind intensity, and about the complex nonlinear relation among eolian parameters, paleoclimate, glaciation cycles, and Milankovitch orbital forcing. The eolian flux records in the deep-sea show the humid environments at the time of Paleocene, Eocene, and Oligocene in the South America and East Asia and the significant phased increasing of Asian continental aridity degree since the late Miocene along with the expanding of northern hemisphere glacier. The consistency between flux record of marine eolian, deep-sea (δ^(18)O) records, and magnetic susceptibility of loess and interbedded soils indicates that it may be possible to link continental paleoclimatic records to marine records of similar resolution through marine eolian records. In comparison with eolian flux, the grain-size of eolian component varied with higher frequency and its dominant periodicities is 23 ka. The intensity of atmospheric circulation reflected by grain-size of eolian deposition denotes the independent atmosphere circulation of southern and northern hemisphere, and the evolution of west wind and intertropical convergence zone (ITCZ). At last some existent problems at present and prospect in the field of marine eolian deposition were put forward.

关 键 词：海洋风尘沉积 古气候 古大气环流 米兰科维奇周期性 

分 类 号：P736[天文地球—海洋地质]