大气CO2浓度非均匀分布及其对地表升温影响的研究进展与展望     

张帆  宣鑫  邓祥征 《地球信息科学学报》2021,23(8):1362-1371

在气候变化和全球治理挑战日益严峻的背景下,CO₂排放及代价评估日益受到学术界和决策者的关注。当前全球范围包括联合国政府间气候变化专门委员会（IPCC）评估在内的几乎所有研究都是基于全球平均CO₂浓度来驱动气候模式的,但基于全球CO₂平均分布设定开展模拟影响评估在学术界多有争议。首先,综述了大气CO₂非均匀分布的证据,评述了大气CO₂浓度非均匀分布与地表升温过程的互馈机制。其次,从自然和人为2个维度,梳理了大气CO₂浓度非均匀分布形成的原因,并评估了其对地表升温的影响。最后,评述了当前大气CO₂浓度非均匀分布研究中存在的问题,进一步展望了其发展趋势,为把握全球与区域碳排放现状及气候变化影响提供科学判据。  相似文献   

南黄海盆地北凹多幕正反转构造特征及其动力学分析     

祁鹏  王鹏  崔敏  蔡佳 《现代地质》2017,31(3):443

利用重处理的二维地震测线对南黄海盆地北凹进行了精细的构造解释,揭示了三种不同类型的正反转构造样式,分别是中南部的逆冲型、东部的压扭型和北部的褶皱型,主要受控于其所处的不同构造位置。通过典型地震测线的平衡剖面分析,并结合区域构造动力学背景分析,认为北凹至少发生了三幕构造正反转,主要受控于不同地质时期太平洋板块对欧亚大陆俯冲速度和角度的改变。其中,三垛组沉积之后,太平洋板块俯冲角度逐步由北西向转为南西西向,并且俯冲速度明显增大,使得北凹处于北东南西向挤压环境中,广泛发育正反转构造,这也是最强烈的一幕正反转,表现为强烈的逆断层活动和地层剥蚀。过度的正反转作用可能对北凹油气藏的形成造成了不利的影响。  相似文献   

Flow Experience Study of Eco-tourists: A Case Study of Hunan Daweishan Mountain Ski Area     

ZHENG Qunming  TANG Rong  MO Ting  DUAN Nijing  LIU Jia 《资源与生态学报(英文版)》2017,8(5):494-501

Mountain skiing has become a popular winter ecotourism activity in China. Studying the loyalty of eco-tourists from the perspective of tourist experience is important to the continued development of mountain ski tourism. Based on the flow experience theory, we developed and tested a structural equation model to examine relationships among flow experience, positive emotions and the loyalty of eco-tourists. Survey data from 324 eco-tourists with skiing experience at Daweishan Mountain Ski Resort was used for exploratory factor, confirmatory factor and path analyses. Results revealed five dimensions of flow experiences of eco-tourists: Concentration on task at hand, Loss of self-consciousness, Transformation of time, Autotelic experience, and Challenge-skill balance. As hypothesized, influences of Transformation of time, Autotelic experience and Challenge-skill balance on positive emotions were significant and positive. Concentration on task at hand, Autotelic experience, Challenge-skill balance and positive emotions positively influenced the loyalty of eco-tourists. Suggestions for developing ecotourism products are discussed such as designing a conductive environment to activate flow experience, providing personalized service to promote positive emotion, and developing experiential tourism activities.  相似文献