近2000年来福建南部海岸沙丘记录的风沙活动序列

发布时间：2018-07-09 19:18

本文选题：海岸沙丘 + 光释光(OSL)测年　；参考：《海洋科学》2017年06期

【摘要】：对福建南部漳浦地区赤湖海岸沙丘(CH)和大澳海岸沙丘(CDS)近2 000年以来海岸风沙活动历史及其东亚冬季风(EAWM)的关系进行研究。在野外沙丘剖面沉积构造考察基础上,通过光释光(OSL)测年技术重建研究区海岸风沙活动序列。结果表明:(1)漳浦海岸有近2 000年来发育的多期海岸风沙沉积,其中,CH沙丘记录的风沙活动期分别为BC100 AD300年、AD500 AD870年、AD1050 AD1380年;CDS沙丘记录了AD200年左右、AD1040 AD1280年以及AD1410 AD1710年3个风沙活动期。(2)研究区海岸风沙活动期与我国东部海岸、东北亚及西北欧海岸风沙活动期大体一致。可能反映了近2 000年以来北半球气候环境发生了大范围的阶段性变化,各个区域海岸风沙活动起止时间的不同,反映了各地所处大气环流系统位置的分异或是地方性因素的差异。(3)东亚冬季风对福建南部沿海的风沙活动有明显影响。一般来讲,EAWM强盛时,海岸风沙沉积比较活跃。虽然在最近2 000年的冷暖期都有海岸风沙沉积,但在暖期仅限于EAWM相对强盛的时期。EAWM影响范围广阔,是东亚海岸风沙活动周期具有准同时性的基本驱动因素。此外,北大西洋涛动(NAO)通过影响EAWM的强度驱动海岸风沙活动的阶段性发生,因而对研究区海岸沙丘发育产生间接影响。本文讨论近2 000年以来季风区海岸沙丘演变序列及驱动机制,可提取百年尺度上的海岸沉积古环境信息,探讨东亚冬季风演化特征。
[Abstract]:The history of coastal aeolian activity and the relationship between East Asian Winter Monsoon (EAWM) and coastal sand activity (Ch) in Chaangpu area, southern Fujian Province, in recent 2000 years were studied in the red lake coastal dunes (Ch) and Tai O coastal dunes (CDS). Based on the investigation of sedimentary structures in the sand dune profile in the field, the sequence of aeolian sand activity in the study area was reconstructed by means of OSL dating technique. The results are as follows: (1) there are several periods of coastal aeolian sediments developed in recent 2000 years in Zhangpu coast. The active periods of aeolian sand activity recorded in Ch dunes are respectively BC100 / AD300 / AD500 / AD870 / AD1050 / AD1380 / CDS dunes recorded three periods of aeolian sand activity in AD1040 / AD1280 and AD1410 / AD1710 respectively. (2) Coastal aeolian activities in the study area and the east coast of China; The period of wind-blown sand activity in northeast Asia and western northern Europe is roughly the same. It may reflect that the climate and environment of the Northern Hemisphere have undergone large-scale periodic changes in the past 2000 years, and the onset and end time of the coastal sandstorm activities in various regions are different. It reflects the difference of the location of the atmospheric circulation system or the difference of local factors. (3) the East Asian winter monsoon has obvious influence on the wind-sand activity in the southern coastal area of Fujian. Generally speaking, the coastal aeolian sediment is active when EAWM is strong. Although the coastal aeolian sediment was deposited in the last 2000 years, it is limited to the relatively strong EAWM in the warm period. EAWM has a wide range of influence, which is the basic driving factor of the east-Asia coastal wind-sand activity cycle with quasi-synchronism. In addition, the North Atlantic Oscillation (NAO) has an indirect effect on the development of coastal dunes by influencing the intensity of EAWM. In this paper, the evolution sequence and driving mechanism of coastal dunes in monsoon region in recent 2000 years are discussed. The information of coastal sedimentary paleoenvironment on a century-scale can be extracted and the evolution characteristics of East Asian winter monsoon can be discussed.
【作者单位】：福建师范大学地理科学学院;湿润亚热带生态地理过程省部共建教育部重点实验室;福建师范大学地理研究所;
【基金】：国家自然科学基金项目(41771020,41271031,41301012) 福建省自然科学基金项目(2017J01460) 福建师范大学地理科学学院研究生创新基金项目~~
【分类号】：P736.22

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