# Late Neogene pelagic Carbonate Mass Accumulation Rates and Foraminifera weight percent
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#                World Data Service for Paleoclimatology, Boulder 
#                                  and 
#                     NOAA Paleoclimatology Program 
#             National Centers for Environmental Information (NCEI)
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# Template Version 3.0
# Encoding: UTF-8
# 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/28670
#       Description:NOAA Landing Page
# Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/si2019/si2019-odp608-bulk.txt
#      Description: NOAA location of the template
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# Original_Source_URL: 
#       Description:
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# Data_Type: Paleoceanography
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# Dataset_DOI:
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# Parameter_Keywords: physical properties
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# Contribution_Date
#	Date:  2019-12-30
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# File_Last_Modified_Date
#	Date:  2019-12-30
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# Title
#	Study_Name: Late Neogene pelagic Carbonate Mass Accumulation Rates and Foraminifera weight percent 
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# Investigators
#	Investigators: Si, W.; Rosenthal, Y.
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# Description_Notes_and_Keywords
#	Description: 
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# Publication 
#	Authors: Si, W., Rosenthal, Y.
#	Published_Date_or_Year:  2019      
#	Published_Title: Reduced continental weathering and marine calcification linked to late Neogene decline in atmospheric CO2
#	Journal_Name: Nature Geosciences
#	Volume: 12
#	Issue: 10
#	Pages: 833-838
#	Report_Number: 
#	DOI: 10.1038/s41561-019-0450-3
#	Online_Resource: 
#	Full_Citation: Si, W., & Rosenthal, Y. (2019). Reduced continental weathering and marine calcification linked to late Neogene decline in atmospheric CO2. Nature Geoscience, 12(10), 833-838.
#	Abstract: The globally averaged calcite compensation depth has deepened by several hundred metres in the past 15 Myr. This deepening has previously been interpreted to reflect increased alkalinity supply to the ocean driven by enhanced continental weathering due to the Himalayan orogeny during the late Neogene period. Here we examine mass accumulation rates of the main marine calcifying groups and show that global accumulation of pelagic carbonates has decreased from the late Miocene epoch to the late Pleistocene epoch even though CaCO3 preservation has improved, suggesting a decrease in weathering alkalinity input to the ocean, thus opposing expectations from the Himalayan uplift hypothesis. Instead, changes in relative contributions of coccoliths and planktonic foraminifera to the pelagic carbonates in relative shallow sites, where dissolution has not taken its toll, suggest that coccolith production in the euphotic zone decreased concomitantly with the reduction in weathering alkalinity inputs as registered by the decline in pelagic carbonate accumulation. Our work highlights a mechanism whereby, in addition to deep-sea dissolution, changes in marine calcification acted to modulate carbonate compensation in response to reduced weathering linked to the late Neogene cooling and decline in atmospheric partial pressure of carbon dioxide.
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# Funding_Agency 
#	Funding_Agency_Name: NSF
#	Grant: OCE 634573
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# Site_Information 
#	Site_Name: ODP 608
# 	Location: North Atlantic Ocean
#	Northernmost_Latitude: 42.836833
#	Southernmost_Latitude: 42.836833
# 	Easternmost_Longitude: -23.0875
# 	Westernmost_Longitude: -23.0875
# 	Elevation:  -3526
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# Data_Collection   
#	Collection_Name:  ODP608 Bulk MAR Si2019
#	Earliest_Year:  13000000
#	Most_Recent_Year:  0
#	Time_Unit:  cal yr BP
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# Chronology_Information
#	Chronology: 
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# Variables
# Data variables follow that are preceded by "##" in columns one and two.
# Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data)
## depth_m	depth,,,meter,,paleoceanography,,,N,
## age_Ma	age,,,million years ago,,paleoceanography,,,N,
## Bulk_MAR	accumulation rate,sediment,,gram per square centimeter per kiloyear,,paleoceanography,,,N,bulk mass accumulation rate
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# Data:
# Data lines follow (have no #)
# Data line format - tab-delimited text, variable short name as header
# Missing_Values: NA
depth_m	age_Ma	Bulk_MAR
0.00	0.00	1.43
16.54	0.78	1.29
21.29	1.07	1.93
41.50	1.93	3.97
66.28	2.53	4.27
85.69	3.00	4.32
109.65	3.58	2.43
119.24	4.00	2.44
130.65	4.50	2.46
142.07	5.00	2.48
155.54	5.59	1.37
160.68	6.00	1.38
166.95	6.50	1.38
173.23	7.00	1.39
179.50	7.50	1.39
185.77	8.00	1.39
192.04	8.50	1.39
198.31	9.00	1.39
204.96	9.53	2.04
213.59	10.00	2.04
223.68	10.55	2.54
233.94	11.00	2.54
254.46	11.90	2.72
269.03	12.50	2.72
281.17	13.00	2.73
298.16	13.70	NA