# Central Equatorial Pacific Paleoproductivity Data over the last 27ka
#-----------------------------------------------------------------------
#               World Data Service for Paleoclimatology, Boulder
#                                   and
#                      NOAA Paleoclimatology Program
#-----------------------------------------------------------------------
# NOTE: Please cite original publication, online resource and date accessed when using this data.
# If there is no publication information, please cite Investigator, title, online resource and date accessed.
#
# Description/Documentation lines begin with #
# Data lines have no #
#
# Online_Resource: https://www.ncdc.noaa.gov/paleo/study/22150
# Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/costa2017-gbc/costa2017-gbc-28bb.txt
#
# Archive: Paleoceanography
#
# Parameter_Keywords: geochemistry, radiogenic isotopes
#---------------------------------------
# Contribution_Date
#    Date: 2017-05-26
#---------------------------------------
# Title
#    Study_Name: Central Equatorial Pacific Paleoproductivity Data over the last 27ka
#---------------------------------------
# Investigators
#      Investigators: Costa, Kassandra
#---------------------------------------
# Description and Notes
#        Description: Cores are either Multi-core (MC) or big bertha gravity core (BB).
#---------------------------------------
# Publication
# Authors: Costa, K.M., A.W. Jacobel, J.F. McManus, R.F. Anderson, G. Winckler, and N. Thiagarajan
# Published_Date_or_Year: 2017
# Published_Title: Productivity patterns in the equatorial Pacific over the last 30,000 years
# Journal_Name: Global Biogeochemical Cycles
# Volume: 31
# Edition: 
# Issue: 
# Pages: 
# Report Number: 
# DOI: 10.1002/2016GB005579
# Online_Resource: 
# Full_Citation: 
# Abstract: The equatorial Pacific traverses a number of productivity regimes, from the highly productive coastal upwelling along Peru to the near gyre-like productivity lows along the international dateline, making it an ideal target for investigating how biogeochemical systems respond to changing oceanographic conditions over time. However, conflicting reconstructions of productivity during periods of rapid climate change, like the last deglaciation, render the spatiotemporal response of equatorial Pacific productivity ambiguous. In this study, surface productivity since the last glacial period (30,000 years ago) is reconstructed from seven cores near the Line Islands, central equatorial Pacific, and integrated with productivity records from across the equatorial Pacific. Three coherent deglacial patterns in productivity are identified: (1) a monotonic glacial-Holocene increase in productivity, primarily along the Equator, associated with increasing nutrient concentrations over time; (2) a deglacial peak in productivity ~15,000 years ago due to transient entrainment of nutrient rich southern-sourced deep waters; and (3) possible precessional cycles in productivity in the eastern equatorial Pacific that may be related to Intertropical Convergence Zone migration and potential interactions with El Niño–Southern Oscillation dynamics. These findings suggest that productivity was generally lower during the glacial period, a trend observed zonally across the equatorial Pacific, while deglacial peaks in productivity may be prominent only in the east.
#---------------------------------------
# Funding_Agency
#    Funding_Agency_Name: National Science Foundation
#    Grant: AGS-15-02889, OCE-10-60947
#---------------------------------------
# Site Information
# Site_Name: ML1208-28BB, Line Islands
# Location: Central Equatorial Pacific
# Country: 
# Northernmost_Latitude: 2.97
# Southernmost_Latitude: 2.97
# Easternmost_Longitude: -159.2
# Westernmost_Longitude: -159.2
# Elevation: -3152
#---------------------------------------
# Data_Collection
#   Collection_Name: ML1208-28BB Prod Costa2017
#   First_Year: 28925
#   Last_Year: 4298
#   Time_Unit: cal yr BP
#   Core_Length: 
#   Notes: 
#---------------------------------------
# Chronology_Information 
# Chronology: 
#---------------------------------------
# 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)
## Core	core name,,,,,,,,C,
## depth_cm	depth,,,cm,,,,,N,
## age_calyrBP	Age of the sediment,,,cal yr BP,,,,,N,
## 231Pa/230Th  231Pa/230Th,,,activity ratio,,,excess initial,,N,
## 231Pa/230Th_2s_err   231Pa/230Th,,two standard deviations,activity ratio,,,,,N,
#------------------------
# Data
# Data lines follow (have no #)
# Data line format - tab-delimited text, variable short name as header
# Missing Value: NaN
Core	depth_cm	age_calyrBP	231Pa/230Th	231Pa/230Th_2s_err	
29MC	0	4298	0.068	0.002	
29MC	2	4478	0.069	0.002	
29MC	4	4658	0.071	0.002	
29MC	6	4838	0.069	0.002	
29MC	8	5018	0.069	0.002	
28BB	8	6441	0.069	0.002	
28BB	10	6779	0.070	0.002	
28BB	11	6948	0.070	0.002	
28BB	12	7117	0.069	0.002	
28BB	13	7286	0.065	0.002	
28BB	14	7455	0.067	0.002	
28BB	15	7624	0.067	0.002	
28BB	16	7794	0.063	0.002	
28BB	18	8132	0.064	0.002	
28BB	20	8470	0.067	0.002	
28BB	21	8639	0.062	0.001	
28BB	22	8808	0.067	0.002	
28BB	23	8977	0.066	0.002	
28BB	24	9200	0.066	0.002	
28BB	25	9476	0.064	0.002	
28BB	26	9753	0.065	0.002	
28BB	27	10029	0.063	0.002	
28BB	28	10305	0.064	0.002	
28BB	29	10581	0.063	0.002	
28BB	30	10857	0.059	0.001	
28BB	31	11134	0.064	0.002	
28BB	32	11410	0.064	0.002	
28BB	33	11686	0.062	0.002	
28BB	34	11989	0.064	0.002	
28BB	35	12320	0.061	0.002	
28BB	36	12651	0.063	0.002	
28BB	37	12982	0.062	0.002	
28BB	38	13313	0.064	0.002	
28BB	39	13644	0.068	0.002	
28BB	40	13974	0.067	0.002	
28BB	41	14305	0.065	0.002	
28BB	42	14636	0.067	0.002	
28BB	43	14967	0.067	0.002	
28BB	44	15298	0.066	0.002	
28BB	45	15629	0.066	0.002	
28BB	46	16029	0.065	0.002	
28BB	47	16498	0.064	0.002	
28BB	48	16968	0.062	0.002	
28BB	49	17437	0.063	0.002	
28BB	50	17907	0.066	0.002	
28BB	51	18376	0.060	0.001	
28BB	52	18846	0.063	0.002	
28BB	53	19315	0.066	0.002	
28BB	54	19766	0.064	0.003	
28BB	58	21490	0.067	0.002	
28BB	62	23214	0.068	0.002	
28BB	65	24507	0.064	0.002	
28BB	68	25800	0.067	0.002	
28BB	75	28710	0.066	0.002	
28BB	76	28925	0.068	0.006