本文利用美国国家大气研究中心(NCAR)的通用地球系统模式(Community Earth System Model,简称CESM)的低分辨率版本(CESM1.0.3,T31_g37)在国际国内率先进行了多组过去2000年瞬变积分模拟试验,在与历史重建资料和观测资料进行对比验证的基础上,对过去2000年中的典型暖期(中世纪暖期与现代暖期)的特征和成因机制进行了初步探讨,结果表明:中世纪暖期太阳辐射加强是导致其“暖化”的主要原因之一,而温室气体浓度的激增是现代全球变暖的最主要原因;在中世纪暖期,自然因子(包括太阳辐射和火山活动)对降水量的影响之和比温室气体的影响高一个数量级;而在现代暖期,温室气体对降水量的影响比自然因子(包括太阳辐射和火山活动)对降水量的影响之和高一个数量级;在不同外强迫条件下的海表温度变化在热带太平洋区域截然不同,即自然因子影响下为类-拉尼娜态,而温室气体影响下为类-厄尔尼诺态;无论在中世纪暖期还是现代暖期,相对于1000~1850年的平均情况,沃克(Walker)环流均处于增强状态. 相似文献
Exploring hydraulic connections between brine mining wells is of great significance to the development of geological resources; however, there are still challenges to accurately identifying these connections. In this study, a combination of hydrochemical and biological analyses was used to investigate the hydraulic connections between three saltworks (Yangkou, Hanting, and Changyi) in southern Laizhou Bay, China. The results showed that the groundwater recharge sources at Yangkou saltworks, and therefore the associated salts and hydrochemical composition of the brine, were different from those of the other two saltworks. The diversity and composition of the microbial community among the three saltworks were identified based on a high-throughput DNA sequencing method. The brines of Hanting and Changyi saltworks had greater similarity in terms of microbial diversity and composition, which was consistent with the hydrochemical results. Based on microbial analysis combined with hydrochemistry, the depths of the mining wells at Hanting saltworks were identified, along with the hydraulic connection with Changyi saltworks. As a tool to judge the hydraulic connections of geological reservoirs, microbial analysis combined with hydrochemistry may be applicable to a wider range of subsurface resources, such as oil and gas, which will provide new ideas for the rational development of underground resources.