DOI: 10.1002/grl.50222
论文题名: Terrestrial effects of possible astrophysical sources of an AD 774-775 increase in 14C production
作者: Thomas B.C. ; Melott A.L. ; Arkenberg K.R. ; Snyder II B.R.
刊名: Geophysical Research Letters
ISSN: 0094-9242
EISSN: 1944-8973
出版年: 2013
卷: 40, 期: 6 起始页码: 1237
结束页码: 1240
语种: 英语
英文关键词: carbon-14
; ozone
; solar proton event
Scopus关键词: Astrophysical sources
; Atmospheric effects
; Biological impacts
; Carbon 14
; Coronal mass ejection
; Orders of magnitude
; Solar proton events
; Solar type stars
; Ozone
; Ozone layer
; Protons
; Solar energy
; astrophysics
; carbon isotope
; ice core
; mass extinction
; nitrate
; ozone depletion
; solar radiation
; tree ring
英文摘要: We examine possible sources of a substantial increase in tree ring 14C measurements for the years AD 774-775. Contrary to claims regarding a coronal mass ejection (CME), the required CME energy is not several orders of magnitude greater than known solar events. We consider solar proton events (SPEs) with three different fluences and two different spectra. The data may be explained by an event with fluence about one order of magnitude beyond the October 1989 SPE. Two hard spectrum cases considered here result in moderate ozone depletion, so no mass extinction is implied, though we do predict increases in erythema and damage to plants from enhanced solar UV. We are able to rule out an event with a very soft spectrum that causes severe ozone depletion and subsequent biological impacts. Nitrate enhancements are consistent with their apparent absence in ice core data. The modern technological implications of such an event may be extreme, and considering recent confirmation of superflares on solar-type stars, this issue merits attention. Key Points AD 774-775 14C spike may be explained by solar event Implication for greater likelihood of Significant atmospheric effect but no mass extinction. ©2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876946579&doi=10.1002%2fgrl.50222&partnerID=40&md5=ea4d7f8c5f89cdc1bfe048231836182c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6506
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics and Astronomy, Washburn University, Topeka, KS 66621, United States
Recommended Citation:
Thomas B.C.,Melott A.L.,Arkenberg K.R.,et al. Terrestrial effects of possible astrophysical sources of an AD 774-775 increase in 14C production[J]. Geophysical Research Letters,2013-01-01,40(6).