Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1088/1748-9326/aae285 |
New constraints on massive carbon release and recovery processes during the Paleocene-Eocene Thermal Maximum | |
Penman, Donald E.1; Zachos, James C.2 | |
2018-10-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS
![]() |
ISSN | 1748-9326 |
出版年 | 2018 |
卷号 | 13期号:10 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Recent geochemical and sedimentological evidence constrains the response of seawater chemistry to carbon injection during the Paleocene-Eocene Thermal Maximum (PETM): foraminiferal boron-based proxy records constrain the magnitude and duration of surface ocean acidification, while new deep sea records document a carbonate compensation depth (CCD) over-shoot during the recovery. Such features can be used to more tightly constrain simulations of the event within carbon cycle models, and thus test mechanisms for carbon release, buffering, and sequestration. We use the LOSCAR carbon cycle model to examine first the onset of, and then recovery from the PETM. We systematically varied the mass, rate, and location of Crelease along with changes in ocean circulation patterns as well as initial conditions such as pre-event pCO(2) and the strength of weathering feedbacks. A range of input parameters produced output that successfully conformed to observational constraints on the event's onset. However, none of the successful scenarios featured surface seawater aragonite or calcite undersaturation at even peak PETM conditions (in contrast to anthropogenic acidification projections), and most runs featured approximately a doubling of pCO(2) relative to pre-event conditions (suggesting a high PETM climate sensitivity). Further runs test scenarios of the body and recovery of the PETM against records of sustained acidification followed by rapid pH recovery in boron records, as well as the timing and depth of the CCD overshoot. Successful scenarios all require a sustained release of carbon over many tens of thousands of years following the onset (comparable to the mass released during the onset) and removal of carbon (likely as burial of organic carbon in addition to elevated chemical weathering rates) during the recovery. This sequence of events is consistent with a short-lived feedback involving the release of C-13-depleted C in response to initial warming followed by its subsequent sequestration during the cooling phase. |
英文关键词 | PETM carbon cycle ocean acidification |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000456534700002 |
WOS关键词 | ISOTOPE EXCURSION ; ANTHROPOGENIC CARBON ; OCEAN ACIDIFICATION ; METHANE HYDRATE ; MODEL ; PETM ; DISSOCIATION ; CLIMATE ; CYCLE ; PROXY |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35377 |
专题 | 气候变化 |
作者单位 | 1.Yale Univ, Dept Geol & Geophys, POB 6666, New Haven, CT 06511 USA; 2.Univ Calif Santa Cruz, Earth & Planetary Sci, Santa Cruz, CA 95060 USA |
推荐引用方式 GB/T 7714 | Penman, Donald E.,Zachos, James C.. New constraints on massive carbon release and recovery processes during the Paleocene-Eocene Thermal Maximum[J]. ENVIRONMENTAL RESEARCH LETTERS,2018,13(10). |
APA | Penman, Donald E.,&Zachos, James C..(2018).New constraints on massive carbon release and recovery processes during the Paleocene-Eocene Thermal Maximum.ENVIRONMENTAL RESEARCH LETTERS,13(10). |
MLA | Penman, Donald E.,et al."New constraints on massive carbon release and recovery processes during the Paleocene-Eocene Thermal Maximum".ENVIRONMENTAL RESEARCH LETTERS 13.10(2018). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论