globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2012.08.019
论文题名:
Improving coral-base paleoclimate reconstructions by replicating 350years of coral Sr/Ca variations
作者: DeLong K.L.; Quinn T.M.; Taylor F.W.; Shen C.-C.; Lin K.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 373
起始页码: 6
结束页码: 24
语种: 英语
英文关键词: 230Th ; New Caledonia ; Oxygen isotopes ; Porites ; Sr/Ca
英文摘要: Coral-based climate reconstructions are typically based on a single record and this lack of replication leads to questions in regards to chronology accuracy and reliability of the inclusive geochemical variations to record climate viability. Here we present two multi-century coral Sr/Ca records recovered from a Porites lutea colony offshore of Amédée Island, New Caledonia (22°28.8'S, 166°27.9'E). The chronology was developed by cross dating the coral Sr/Ca time series and verifying the chronology with high precision absolute 230Th dating. We identify chronological discrepancies of -2.3 and +3.7years century-1 for reconstructions based on a single core with uncertainty increasing after ~250years. We assess the impact of Porites skeletal architecture on coral geochemistry by characterizing centimeter-scale architectural structures with respect to sampling. Optimal sampling paths are those on the slab surface parallel to the growth direction of individual corallites along the central axis of an actively extending corallite fan. Coral Sr/Ca time series extracted from optimal skeletal structures are highly reproducible with a mean absolute difference of 0.021mmolmol-1 or 0.39°C for monthly determinations. Suboptimal skeletal architecture is characterized by corallites extending through the slab surface, and the coral Sr/Ca determinations derived from suboptimal paths tend to produce a warm bias that varies between +0.04 and +2.30°C. Disorganized skeletal architecture is characterized by small, terminating, or unclear corallite fans that produce a cold bias of -0.11 to -2.45°C in coral Sr/Ca determinations. These problematic architecture types also produce biases in coral δ18O determinations, but to a lesser extent. We assess the impact of sampling a coral colony along paths that vary from vertical to horizontal in large and small Porites colonies with extension rates >6mmyear-1 and we determine there is no significant difference in the coral Sr/Ca records. © 2012 Elsevier B.V.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69821
Appears in Collections:过去全球变化的重建

Files in This Item:

There are no files associated with this item.


作者单位: College of Marine Science, University of South Florida, 140 7th Avenue South, St. Petersburg, FL 33701, United States; Department of Geography and Anthropology, Louisiana State University, 227 Howe-Russell Geoscience Complex, Baton Rouge, LA 70803, United States; Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, J.J. Pickle Research Campus Bldg. 196, 10100 Burnet Road, R2200, Austin, TX 78758, United States; Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, 1 University Station C1100, Austin, TX 78712, United States; High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan

Recommended Citation:
DeLong K.L.,Quinn T.M.,Taylor F.W.,et al. Improving coral-base paleoclimate reconstructions by replicating 350years of coral Sr/Ca variations[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,373
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[DeLong K.L.]'s Articles
[Quinn T.M.]'s Articles
[Taylor F.W.]'s Articles
百度学术
Similar articles in Baidu Scholar
[DeLong K.L.]'s Articles
[Quinn T.M.]'s Articles
[Taylor F.W.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[DeLong K.L.]‘s Articles
[Quinn T.M.]‘s Articles
[Taylor F.W.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.