# South Atlantic 25Ma ODP Leg 177 Sediment Reflectance Data
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#                World Data Center for Paleoclimatology, Boulder
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#                     NOAA Paleoclimatology Program
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# NOTE: Please cite Publication, and Online_Resource and date accessed when using these data.
# If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed.
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# Online_Resource: https://www.ncdc.noaa.gov/paleo/study/15 ???
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# Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/oconnell2002/readme-oconnell2002.txt
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# Description/Documentation lines begin with #
# Data lines have no #
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# Archive: Paleoceanography
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# Contribution_Date
#	Date: 2013-10-25
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# Title
#	Study_Name: South Atlantic 25Ma ODP Leg 177 Sediment Reflectance Data
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# Investigators
#       Investigators: O'Connell, S; Ortiz, J.
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# Description_and_Notes
#	Description:  ODP Leg 177 reflectance data from 7 ODP cores (ODP1088 - ODP1094) in the sub-antarctic Atlantic.
#       Quantitative estimates of sediment diffuse spectral reflectance were generated by the shipboard sedimentologists
#       using the Oregon State University Split Core Analysis Track (SCAT) (*_SC.DAT files) or Minolta Spectrophotometer.
#       *_REFLECT.DAT files).  Format information DOC files for each type are included.
#       This information is also available on the CDROM included in the ODP Leg 177 IR volume.
#       More information at: http://www-odp.tamu.edu/publications/177_SR/VOLUME/CHAPTERS/SR177_06.PDF
#
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# Publication
#       Authors: O'Connell, S. and J. Ortiz
#       Published_Date_or_Year: 2002-01-01
#       Published_Title: Data report: Calcium carbonate stratigraphy from sample measurements and diffuse spectral reflectance at Site 1090, ODP Leg 177
#       Journal_Name: In Gersonde, R., Hodell, D.A., and Blum, P. (Eds.) Proceedings of the Ocean Drilling Program, Scientific Results
#       Volume: 177
#       Edition:
#       Issue:
#       Pages: 1-24
#       DOI:
#       Online_Resource:
#       Full_Citation:
#       Abstract: A total of 776 sediment samples were measured for percent CaCO3 using a coulometer. These data are compared with percent blue reflectance (450-550 nm) measured with the Oregon State University splitcore analysis track. In previous studies percent blue reflectance has been an excellent proxy for percent CaCO3 and in this study shows many of the main depositional trends (i.e., a 100-k.y. cycle, with a 55% reflectance range is evident in the upper 900 k.y., underlain by sediments exhibiting a 40-k.y. cycle with only a 30% reflectance range). Between ~21 and 5 Ma the average percent reflectance decreases from ~35% to ~8%. A similar decrease is also recorded between ~24 and 22 Ma. Percent CaCO3 trends closely match those of the percent blue spectral reflectance. This is especially well shown in the 100-k.y. cyclicity and in the interval between 24.5 and 21.5 Ma. In both intervals CaCO3 analyses are abundant. An exception occurs in the interval between 2 and 5 meters composite depth (~193 and 240 k.y.). There, percent CaCO3 and percent reflectance are out of phase. The lack of agreement is not likely to be due to a very wet core, in which water would dominate the spectral reflectance instead of sediment, or to problems with the composite depth slice. The discrepancy remains unexplained and provides clear evidence that when noninvasive measurements are used as proxies for chemical measurements they must be substantiated by the actual chemical or physical measurements.
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# Funding_Agency
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# Site_Information
#       Site_Name: ODP 1090
#       Location: Ocean>Atlantic Ocean>South Atlantic Ocean
#	Country:
#	Northernmost_Latitude: -42.9133
# 	Southernmost_Latitude: -42.9133
# 	Easternmost_Longitude: 8.92
# 	Westernmost_Longitude: 8.92
# 	Elevation: -3702 m
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# Data_Collection
#	Collection_Name: ODP1090reflectance
#	Earliest_Year: 25000000
#	Most_Recent_Year: 0
#	Time_Unit: Cal. Year BP
#	Core_Length: 225.69 m
#	Notes:
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# Chronology:
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# Variables
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# Data variables follow (have no #)
# Data line variables format:  Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data)
## depth_m	depth, , , m, , , , ,N
## Refl250-350nm	Average of color reflectance values between 250 and 350 nm, , , , , , , ,N
## Refl450-550nm	Average of color reflectance values between 450 and 550 nm, , , , , , , ,N
## Refl650-750nm	Average of color reflectance values between 650 and 750 nm, , , , , , , ,N
## Refl850-950nm	Average of color reflectance values between 850 and 950 nm, , , , , , , ,N