Reconstruction of monsoon in western part of Japan since the last Interglacial age viewed from eolian dust

在为期三年的研究期间，对冲绳、细池摩尔和仓吉进行了调查。冲绳是亚洲内陆沙漠经西风输送的风尘的南界。冈山县中国山脉的细池和鸟取县的仓吉是冰河时期亚洲内陆沙漠风成尘分布的北方界限。朝鲜中西部的风成尘是在冰河时期由冬季的西北风从北方前寒武纪岩石区搬运而来的。除此之外，还对北海道、福井和中国东北的黄土样品进行了对比分析。1）自MIS10以来，塔克拉玛干沙漠和戈壁沙漠的风尘通过副热带夏季急流沿着中纬度路径输送到冲绳。红黄壤的母质大部分由风成尘组成。2）在细池摩尔沼泽，在温暖的季节，河流物质沉积占主导地位。 ...更多信息 而在距今30，000年以来的寒冷时期，风尘沉积占主导地位。风成尘是由北方前寒武纪岩石区在冰期的冬季西北风带来的，而风成尘是由中国内陆沙漠在MIS 1.3）在黑屋，从300 ka以来，在火山灰之间沉积了壤土层。从ESR氧空位判断，壤土层中的大部分粉砂级石英被认为是风成尘。4）MIS 10的朝鲜中西部朝鲜黄土由来自北方亚洲大陆的风成尘和冰期沉积的黄海干燥海底的风成尘组成的混合物质组成。北海道和福井的风尘是在冰期从北方亚洲大陆搬运来的。世纪以来，中国东北地区的风沙活动主要是由于人为植被的改变而增加的。少

In the research periods of three years, Okinawa, Hosoike moor and Kurayoshi were investigated. Okinawa Island is the southern limit of eolian dust transported by westerly winds from the Asian Inland deserts. The Hosoike in the Chugoku Mountains in Okayama Prefecture and Kurayoshi in Tottori Pref. are the northern limits of eolian dust from Asian Inland deserts distributed during the ice ages. Eolian dust in the mid-west of Korea was transported,from the northern Precambrian rock regions by winter north-westerly winds during the ice ages. In addition to three areas, loess samples from Hokkaido, Fukui and northeastern China were analyzed in the comparative study.1)Eolian dust from Taklamakan and the Gobi deserts have been transported to Okinawa along a middle latitude course by the sub-tropical summer jet stream since MIS 10. A large portion of the parent material in the Red-Yellow soils consists of eolian dust.2) In the Hosoike moor, fluvial material deposition prevailed during the warm … More er Interstadials, while, eolian dust deposition prevailed during the cold periods since 30,000 years BP. Eolian dust was brought from the northern Precambrian rock regions by the winter northwesterly winds during glacial periods, while, eolian dust was transported from the Chinese Inland deserts by the summer jet stream in MIS 1.3)In Kuroyashi, loam layers have been deposited between tephras since 300 ka. Judging from ESR oxygen vacancy, most of the silt-sized quartz in loam layers is considered to be eolian dust.4)Korean loess in mid-western Korea from MIS 10 consists of mixed material consisting of both eolian dust from the northern Asian continent and from the dried sea floor of the Yellow Sea deposited during glacial periods.5)Judging from ESR high oxygen vacancies, the eolian dust in Hokkaido and that in Fukui were transported from the northern Asian continent during glacial periods. In northeastern China, eolian dust increased through anthropogenic vegetation changes since the 14th century. Less