Identifying the Predominant Sources of Atmospheric Dust to the Antarctic using Peat Cores from Ombrotrophic Sphagnum Bogs in Patagonia

利用巴塔哥尼亚环营养泥炭沼泽的泥炭芯确定南极大气尘埃的主要来源

• 批准号: 5409458
• 负责人: Professor Dr. William Shotyk
• 金额: --
• 依托单位: Department of Renewable Resources
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5409458?language=en
• 关键词: Identifying; Predominant; Sources; Atmospheric; Dust

Antarctic ice cores document considerable variation in the fluxes of atmospheric soil dust, volcanic ash particles, and trace metals, but the records are incomplete and the predominant sources of these aerosols are poorly characterised with respect to space and time. Ombrotrophic peat bogs are excellent archives of most atmospheric particles and a wide range of trace metals, and are abundant in Tasmania, New Zealand and Patagonia. The study proposed here will represent the first complete, long term (13.000 yr), high resolution reconstruction of atmospheric dust and trace metal deposition for the southern hemisphere. Conservative, lithogenic trace metals (Ti, Y, Zr, Hf, REE) will be used to quantify the changing rates of atmospheric soil dust deposition, and the ration of these elements to Sc will document changes in mineralogy and particle size. Lead and Sr isotope data will be used to identify changes in predominant dust source areas which will provide new insight into Holocene climate change in the southern hemisphere. Arsenic, Ag, Cd, Sb and Pb will be used to estimate anthropogenic contributions to the metal fluxes. In addition, trace elements supplied by volcanoes will be identified using changes in Au and Bi concentrations, and cosmogenic dust using Os and Ir. These new terrestrial records will complement the existing trace metal and dust records from Antarctica snow and ice archives, and fill in a number of important research gaps.

南极冰芯记录了大气土壤尘埃、火山灰颗粒和微量金属通量的相当大的变化，但记录不完整，这些气溶胶的主要来源在空间和时间上的特征也很差。全营养泥炭沼泽是大多数大气颗粒物和各种微量金属的优秀档案，在塔斯马尼亚，新西兰和巴塔哥尼亚丰富。这里提出的研究将代表第一个完整的，长期的（13.000年），高分辨率重建的大气尘埃和微量金属沉积的南半球。保守的，岩石微量金属（钛，钇，锆，铪，稀土元素）将被用来量化大气土壤粉尘沉积的变化率，这些元素的比例，钪将记录矿物学和粒度的变化。铅和锶同位素数据将用于确定主要灰尘源区的变化，这将为南半球全新世气候变化提供新的见解。砷，银，镉，锑和铅将被用来估计人为贡献的金属通量。此外，将利用Au和Bi浓度的变化确定火山提供的微量元素，并利用Os和Ir确定宇宙尘。这些新的陆地记录将补充南极洲冰雪档案中现有的微量金属和尘埃记录，并填补一些重要的研究空白。