CAJ | 학술논문

中生代不仅是地球发展和生命演化的重要阶段，同时也是距离现代最近的典型温室气候期。其中，白垩纪被视为地球历史时期温室气候的最佳范例之一。通过古植物气孔参数、古土壤同位素以及地球化学模型等途径的研究，可以勾勒出白垩纪这一典型温室气候环境下古大气二氧化碳浓度变化的大致轮廓。在整个白垩纪时期大气二氧化碳水平相对较高，但在白垩纪早期较低，白垩纪中期达到最高，而白垩纪晚期逐渐降低。更重要的是，借助于这些地质参数还更精确地识别出在白垩纪关键时期出现了几次显著的古大气二氧化碳的短期快速波动变化，表明白垩纪的温室气候状态并非之前所想象的那么稳定，而是发生了几次大规模快速气候扰动事件，并伴随着二氧化碳浓度的短期波动变化。这项研究质疑了整个白垩纪期间气候温度均匀分布且呈现单一稳定温室状态的观点。
중생대불부시지구발전화생명연화적중요계단，동시야시거리현대최근적전형온실기후기。기중，백성기피시위지구역사시기온실기후적최가범례지일。통과고식물기공삼수、고토양동위소이급지구화학모형등도경적연구，가이구륵출백성기저일전형온실기후배경하고대기이양화탄농도변화적대치륜곽。재정개백성기시기대기이양화탄수평상대교고，단재백성기조기교저，백성기중기체도최고，이백성기만기축점강저。경중요적시，차조우저사지질삼수환경정학지식별출재백성기관건시기출현료궤차현저적고대기이양화탄적단기쾌속파동변화，표명백성기적온실기후상태병비지전소상상적나요은정，이시발생료궤차대규모쾌속기후우동사건，병반수착이양화탄농도적단기파동변화。저항연구질의료정개백성기기간기후온도균균분포차정현단일은정온실상태적관점。
Mesozoic era is a crucial stage for the Earth development and life evolution, and is particularly significant for bearing typical greenhouse climate that is the closest to today. Among them, the Cretaceous is considered as one of the best example of the greenhouse climate in Earth history. Recent progresses including fossil plant stomata parameters, paleosol isotope and geochemical model, made it possible to synthesize the CO2 variations throughout the Cretaceous. The results showed that atmospheric CO2 levels remained relatively high throughout the Cretaceous, but they were lower in the early Cretaceous, highest in the mid-Cretaceous and gradually declined during the late Cretaceous. However, this overall trend was interrupted by several rapid changes of paleo-CO2 associated with some geological events. It thus showed that the Cretaceous greenhouse climate condition is not as stable as we thought before, but instead with some short-term fluctuations related to the brief episodes of climate change.