English  |  正體中文  |  简体中文  |  Items with full text/Total items : 26988/38789
Visitors : 2348224      Online Users : 37
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search

Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24908

Title: Reassessment of CLIMAP Methods for Estimating Quaternary SeaSurface Temperatures:Examination Using Pacific Coretop Data Sets
Authors: Min-Te Chen;Warren L.Prell
Contributors: NTOU:Institute of Applied Geosciences
Keywords: Reassessment of CLIMAP Methods for Estimating Quaternary SeaSurface Temperatures:Examination Using Pacific Coretop Data Sets Paleoceanography;Planktonic foraminifer;Data base;Pacific Ocean
Date: 1997
Issue Date: 2011-10-20T08:18:11Z
Publisher: Terrestrial, Atmospheric and Oceanic Sciences
Abstract: abstract:Quantitative analyses of planktonic foraminifer faunal data have been applied to reconstruct the past conditions of surface oceans and to verify the results of climate modeling. In the present study, planktonic foraminifer faunal SST (sea-surface temperature) estimates were evaluated using a calibration set and a test set of newly compiled coretop data from the low-latitude Pacific. A standard CLIMAP-type transfer function based on the IKM (Imbrie-Kipp Method) was developed in estimating SST. Comparisons between the SST function and the depth of thermocline (DOT) transfer function developed on the basis of the same calibration coretop data indicated that the correlation between the planktonic foraminiferal abundance distribution and DOT is more significant than that with SST. This comparison suggests that the DOT effect is a more important environmental control on faunal distributions and abundances. After evaluating the functions with a test set of coretop data, the residuals of SST estimates (△SST = estimated – observed SST) were compared with two surface ocean modes which were derived statistically using a principle component analysis of seasonal SST and DOT data of the low-latitude Pacific, as well as an index of carbonate preservation (CPI). The analyses of residuals clearly indicated that the patterns of estimation bias are correlated significantly with the two ocean modes, with a tendency to yield colder estimates for high SST values, and warmer estimates for low SST values, and with a maximum uncertainty around 3 degree to 4 degree. These results also revealed that the carbonate preservation effect may not produce systematic biases. This reevaluation raises questions about the accuracy of faunal SST estimates that are based on the commonly used quantitative techniques, and implies that the CLIMAP low-latitude Pacific SST pattern should be reexamined. From these analyses we suggest that reconstructing DOT or surface ocean modes form planktonic foraminifer faunal data would be more appropriate in future paleoceanographic studies.
Relation: 8(1), pp.111-139
URI: http://ntour.ntou.edu.tw/handle/987654321/24908
Appears in Collections:[應用地球科學研究所] 期刊論文

Files in This Item:

File Description SizeFormat

All items in NTOUR are protected by copyright, with all rights reserved.


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback