气候变化领域集成服务门户(CCPortal): Regional patterns and temporal evolution of ocean iron fertilization and CO2 drawdown during the last glacial termination

CCPortal

DOI	10.1016/j.epsl.2020.116675
	Regional patterns and temporal evolution of ocean iron fertilization and CO2 drawdown during the last glacial termination
	Lambert F.; Opazo N.; Ridgwell A.; Winckler G.; Lamy F.; Shaffer G.; Kohfeld K.; Ohgaito R.; Albani S.; Abe-Ouchi A.
发表日期	2021
ISSN	0012821X
卷号	554
英文摘要	The last time Earth's climate experienced geologically rapid global warming was associated with the last glacial termination, when atmospheric CO2 concentrations rose from 180 ppmv during the Last Glacial Maximum (LGM, 26-19 kaBP) to ∼260 ppmv by the early Holocene (12-8 kaBP). About one quarter of that difference is thought to be due to a stronger biological pump during glacial times, driven by increased aeolian dust deposition and hence greater iron availability in ocean surface waters. However, dust supply did not change uniformly or in synchrony over the deglacial transition and what is not known is the relative importance of different oceanic regions and how this may have changed in time. Using an Earth system model of intermediate complexity, we quantify the sensitivity of atmospheric CO2 to regional changes in iron supply, and test six different global dust reconstructions in order to explore uncertainty in past dust changes. We confirm the Southern Ocean (>34°S) as the region most sensitive to iron fertilization, with the Atlantic and Pacific sectors accounting for about 41±23% and 16±10%, respectively, of the total CO2 reduction from global iron fertilization. However, the North Pacific contributes 28±3% to the total implying an important role for Northern Hemisphere processes in driving deglacial CO2 rise. In addition, our analysis reveals an unexpected regional-temporal disparity, and while Southern Hemisphere iron fertilization influences atmospheric CO2 relatively constantly throughout the termination the impact of the Northern Hemisphere only occurs during the later stages of the termination. © 2020 The Author(s)
关键词	CO2 dust iron fertilization paleoclimate termination
英文关键词	Biology; Carbon dioxide; Dust; Earth (planet); Glacial geology; Global warming; Surface waters; CO2 concentration; Earth system model of intermediate complexity; Iron fertilization; Last Glacial Maximum; Last glacial terminations; Northern Hemispheres; Southern Hemisphere; Temporal evolution; Iron; carbon dioxide; dust; global warming; iron; Last Glacial Maximum; Northern Hemisphere; paleoclimate; reconstruction; temporal evolution
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203175
作者单位	Department of Physical Geography, Pontifical Catholic University of Chile, Chile; Department of Earth and Planetary Sciences, University of California, Riverside, United States; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, United States; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, 27570, Germany; Research Center GAIA Antarctica, University of Magallanes, Chile; Niels Bohr Institute, University of Copenhagen, Denmark; School of Resource and Environmental Management, Simon Fraser University, Canada; School of Environmental Science, Simon Fraser University, Canada; Japan Agency for Marine-Earth Science and Technology, Yokohama, 236-0001, Japan; Department of Environmental and Earth Sciences, Università degli Studi di Milano-Bicocca, Italy; Atmosphere Ocean Research Institute, University of Tokyo, Kashiwa, Chiba 277-8564, Japan
推荐引用方式 GB/T 7714	Lambert F.,Opazo N.,Ridgwell A.,et al. Regional patterns and temporal evolution of ocean iron fertilization and CO2 drawdown during the last glacial termination[J],2021,554.
APA	Lambert F..,Opazo N..,Ridgwell A..,Winckler G..,Lamy F..,...&Abe-Ouchi A..(2021).Regional patterns and temporal evolution of ocean iron fertilization and CO2 drawdown during the last glacial termination.Earth and Planetary Science Letters,554.
MLA	Lambert F.,et al."Regional patterns and temporal evolution of ocean iron fertilization and CO2 drawdown during the last glacial termination".Earth and Planetary Science Letters 554(2021).