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您的检索式：作者名="Stephen P.HESSELBO"
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| 1 | 冰室-(超)温室气候动荡期湖平面演化及天文轨道气候作用显示文摘湖平面变化是影响陆相湖盆沉积与资源赋存、陆地碳收支及环境生态演化的重要因子.湖平面波动受气候作用明显,早侏罗世处在冰室、(超)温室气候动荡期,发生了全球性大洋缺氧(托阿尔期,~183Ma)和气候变冷等极端气候事件(普林斯巴赫期,~185Ma).为研究气候动荡背景下湖平面演化及地球表层水循环和调控机制,选取柴达木盆地早侏罗世湖相连续沉积记录,采用岩石粉末色度(CIE b*)序列开展米兰科维奇旋回分析,建立了基于东特提斯陆相沉积记录的早侏罗世天文年代标尺(~174.2Ma至~190.9Ma),通过沉积噪声模型重建盆地相对湖平面变化曲线,发现5~10Myr尺度湖平面变化响应于长趋势气候演化及极端气候事件;1~2.5Myr尺度湖平面波动显著受控于天文轨道气候作用(~2.4Myr偏心率和~1.2Myr斜率周期).其中,普林斯巴赫期~1.2Myr湖平面周期波动与全球海平面呈“同相位”共变,~1.2Myr斜率周期通过控制极地地区存在的间歇性或永久性冰盖生长和消亡影响全球海平面及湖平面升降;托阿尔期~1.2Myr湖平面波动与全球海平面呈“反相位”关系,在(超)温室气候期极地地区不存在明显冰盖情况下,湖平面受控于~1.2Myr斜率周期控制下的陆地储水单元(湖泊和地下水)和全球海洋间的“起翘板”作用.~2.4Myr长偏心率周期主要通过控制小型冰盖的消长来调控湖(海)平面升降,主要体现在普林斯巴赫期.以上发现表明,气候动荡期地球表层水循环样式及气候调控出现了明显转换,为理解全球海平面变化机制(例如, Glacio-eustasy和Aquifer-eustasy)提供了新的视角和证据. | 李猛 李昕 Stephen P.HESSELBO 李明杰 刘文进 吴伟 潘结南 高瑞珍 | 2024 | 中国科学:地球科学2024，54，1： | 0 |
| 2 | Orbital pacing and secular evolution of lake-level changes reconstructed by sedimentary noise modeling during the Early Jurassic icehouses-(super)greenhouses显示文摘Lake-level changes can significantly affect paleoenvironmental evolution,resource occurrence,terrestrial carbon budget,and biodiversity in continental basins.Climate is one of the most critical factors controlling lake-level changes.Paleoclimate of the Early Jurassic has been evidenced by oscillating icehouses to(super)greenhouses with interrupted intermittent extreme climatic events(hyperthermal and cooling),e.g.,the Toarcian oceanic anoxic event(~183 Ma)and the late Pliensbachian cooling event(~185 Ma).Lake-level evolution and hydrologic cycling on Earth’s surface during the Early Jurassic icehouses-to-(super)greenhouses are thus far poorly understood due to a lack of continuous high-resolution nonmarine evidence.Here we present a super-long nonmarine lake level record for this pivotal interval from the early Pliensbachian to Toarcian by sedimentary noise modeling,and construct a 16.7-Myr-long astronomical time scale(174.2 Ma to 190.9 Ma)based on cyclostratigraphy analysis of rock color datasets(CIE b*)of the Qaidam Basin.Our results document lake-level oscillations on a 5-to 10-million-year(Myr)scale which shows a pronounced correlation with long-term climate variation and extreme climatic events,and 1-to 2.5-Myr-scale lake-level changes that are prominently paced by the 2.4-Myr long-eccentricity forcing and the 1.2-Myr obliquity forcing.At the Pliensbachian Stage,the 1.2-Myr-scale lake-level changes are in phase with the coeval sealevel variations.Orbitally forced growth and decay of the ephemeral or permanent ice sheets in polar regions are interpreted to control the synchronous ups-and-downs of continental lake level and global sea level.However,during the Toarcian ice-free greenhouses to(super)greenhouses,the 1.2-Myr-scale lake-level variations show an anti-phase relationship with global sea level,indicating a‘seesaw’interaction between continental reservoirs(lakes and groundwater)and global oceans.The 2.4-Myr longeccentricity cycles mainly regulate variations of lake level and sea level by controlling the growth and decay of small-scale continental ice sheets,which is especially notable during the Pliensbachian Stage.These findings indicate a remarkable transition of hydrological cycling pattern during the Pliensbachian-Toarcian icehouses to(super)greenhouses,which provides new perspectives and evidence for investigating the hypothesis of global sea-level changes(e.g.,glacio-eustasy and aquifer-eustasy)and long-period astronomical forcing in nonmarine stratigraphy. | Meng LI Xin LI Stephen P.HESSELBO Mingjie LI Wenjin LIU Wei WU Jienan PAN Ruizhen GAO | 2024 | Science China Earth Sciences2024，67，1： | 0 |
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