Abstract:
The SPECMAP paleoclimate archives at NOAA/NCDC World Data Center for Paleoclimatology consist of four (4) archives:
ARCHIVE 1 contains 101 SPECMAP files, including planktonic counts and isotope values, age and sea surface temperature models, and SST estimates. These data were compiled by J. Imbrie and A. Duffy at Brown University for the SPECMAP project. This archive, prepared as part of the ... NSF-funded SPECMAP Project, contains climatic time series of the past 400,000 years, as well as basic downcore and core-top data from which these time series are derived.
The O-18 chronologies of Imbrie et al. (1984) and Martinson et al. (1987) are given for reference, as well as orbital time series taken from the work of Berger (1978a,b).
Also archived are N. G. Kipp's Atlantic core-top foraminiferal data and SST equations FA20 and UW7 derived from them by procedures described in Kipp (1976). FA20 is used to derive SST estimates for cores V25-21, V30-49, V25-59, V25-56, V30-40, RC24-16, V22-174, and RC12-294. Equation UW7, designed for upwelling areas in the southeast Atlantic is used to estimate temperature variations in RC13-228.
Data and models archived here are the basis for the paleoclimatic time series analyzed in 'Oceanic Response to Orbital Forcing in the Late Quaternary: Observational and Experimental Strategies', by J. Imbrie, A. McIntyre, and A. C. Mix. in 'Climate and Geosciences, A Challenge for Science snd Society in the 21st Century', A. Berger, S. H. Schneider, and J.-C. Duplessy, eds., D. Reidel Publishing Company. Table 2 gives the parameters of time series analyzed in this paper.
Parts of this archive are referenced in 'Surface water response of the equatorial Atlantic Ocean to orbital forcing' by McIntyre et al., 1989, Paleoceanography, v. 4, p. 19-55.
Many of the data and models in this archive have been generated as part of the SPECMAP project. Other data sources are listed in Table 1 in the printed memo which accompanies this archive. These include unpublished data of T. J. Crowley, J. D. Hays, N. G. Kipp, A. McIntyre, A. C. Mix, W. F. Ruddiman, and N. J. Shackleton. For more information, see:
SPECMAP Archive #2 contains 70 files including planktonic counts and isotope values, age and sea surface temperature models, and SST estimates. These data were compiled by J. Imbrie et al, and published as:'On the structure and origin of major glaciation cycles. 1. Linear responses to Milankovitch forcing' Paleoceanography, Dec, 1992 (Imbrie et al.,1992). For more information, see:
SPECMAP Archive #3 contains 10 files represent analytical results and data which formed the basis for the discussion of the Devils Hole calcite record, DH-11, in the original reference: J. Imbrie, A. C. Mix, and D. G. Martinson, 1993, Milankovitch Theory Viewed from Devils Hole, NATURE, May, 1993. For more information, see:
SPECMAP Archive #4 contains 47 files of the time series appearing in 'On the Structure and Origin of Major Glaciation Cycles: part 2', Imbrie et al., PALEOCEANOGRAPHY, Dec., 1993 (hereafter part 2). If a time series is contained in SPECMAP Archive 2 it is not repeated here. For more information, see:
A version of SPECMAP Archive #1 is available at cost from NCAR:
Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
N: 90.0
S: -90.0
E: 180.0
W: -180.0
Data Set Citation
Dataset Originator/Creator:
J. Imbrie, A. Duffy, et al , Brown University
Dataset Title:
SPECMAP Archive #1
Dataset Release Date:
February 1990
Dataset Release Place:
Boulder, CO
Dataset Publisher:
IGBP PAGES/World Data Center for Paleoclimatology
Version:
September 1994 update
Issue Identification:
IGBP PAGES/WDC Data Contribution Series # 90-001
Dataset Originator/Creator:
J. Imbrie, et al., Brown University
Dataset Title:
SPECMAP Archive #2
Dataset Release Date:
December 1992
Dataset Release Place:
Boulder, CO
Dataset Publisher:
IGBP PAGES/World Data Center for Paleoclimatology
Issue Identification:
IGBP PAGES/WDC Data Contribution Series # 92-017
Other Citation Details:
'ON THE STRUCTURE AND ORIGIN OF MAJOR GLACIATION CYCLES. , 1. LINEAR RESPONSES TO MILANKOVITCH FORCING', Paleoceanography, Dec, 1992 (Imbrie et al.,1992).
Imbrie, J., McIntyre, A. and Mix, A.C. 'Oceanic Response to Orbital Forcing in the Late Quaternary: Observational and Experimental Strategies'. 1989. In 'Climate and Geosciences, A Challenge for Science snd Society in the 21st Century', A. Berger, S. H. Schneider, and J.-C. Duplessy, eds., D. Reidel Publishing Company.
Imbrie et al., 'On the structure and origin of major glaciation cycles. 1. Linear responses to Milankovitch forcing'. Paleoceanography, Dec, 1992).
Imbrie et al., 'On the Structure and Origin of Major Glaciation Cycles: part 2', Paleoceanography, Dec., 1993.
McIntyre, A. et al. 'Surface water response of the equatorial Atlantic Ocean to orbital forcing' 1989, Paleoceanography, v.4, p. 19-55.
J. Imbrie, A.C. Mix, and D.G. Martinson, 1993, Milankovitch Theory Viewed from Devils Hole, Nature, May, 1993.
J. Imbrie, et al., The orbital theory of Pleistocene climate: Support from a revised chronology of the marine O-18 record, in 'Milankovitch and Climate, Part 1', edited by A.Berger et al.,1984.
