Table of Contents

• Dataset Description
  • Methods & Sampling
  • Data Processing Description
• Data Files
• Parameters
• Instruments
• Project Information
• Funding

[Note: 28 Apr 2017] The metadata description of this dataset is still in progress.  The metadata have not yet been reviewed by the data contributor.

This dataset contains average scleractinian coral (Desmophyllum dianthus) nitrogen isotope records over the past 40,000 years generated using Monte Carlo and Kalman Filters approaches.  

These data were published in:

Wang, X. T., Sigman, D. M., Prokopenko, M. G., Adkins, J. F., Robinson, L. F., Hines, S. K., ... & Haug, G. H. (2017). Deep-sea coral evidence for lower Southern Ocean surface nitrate concentrations during the last ice age. Proceedings of the National Academy of Sciences, 201615718. doi: 10.1073/pnas.1615718114

Related dataset also from this publication:
Southern Ocean deep-sea coral nitrogen isotopes

A synthetic time series of d15N and age were generated using observed measurements in Tasmania and the Drake Passage. Monte Carlo simulation and a Kalman smoother were combined to obtain the best estimate of the average d15N time series on a regular time grid and its corresponding confidence interval.  

For a more detailed methodology description see:

Wang, X. T., Sigman, D. M., Prokopenko, M. G., Adkins, J. F., Robinson, L. F., Hines, S. K., ... & Haug, G. H. (2017). Deep-sea coral evidence for lower Southern Ocean surface nitrate concentrations during the last ice age. Proceedings of the National Academy of Sciences, 201615718. doi: 10.1073/pnas.1615718114

BCO-DMO Data Manager Processing Notes:
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions
* blank values replaced with no data value 'nd'
* combined Excel sheets in original .xlsx file into one tabular dataset.  Created column "source_location" to capture region information which was why the sheets were originally separated.

PI supplied project description:

Intellectual Merit

The history of the nitrogen (N) cycle provides insight into the links between past climate and marine biogeochemical cycles. Interpretations of the history of the N cycle rely on the nitrogen isotopic composition (del15N) of Particulate Organic Nitrogen (del15N-PON) preserved in sedimentary archives such as: bulk organic nitrogen (ON) buried in anoxic/suboxic sediments, skeletal-bound ON in diatom frustules and foraminiferal tests, and organic skeletons of deep-sea proteinaceous corals. As is often is the case with paleo-proxies, these archives have advantages, as well as limitations, the latter arising from temporal and/or spatial restrictions in distribution. Therefore, multiple archives are needed for better understanding the patterns and causes of N cycle variability in the past.

To improve upon the geographic and temporal resolution of del15N paleo-records, this projects evaluates a new proxy for the history of the marine N cycle-- del15N of ON bound within the mineral lattice of deep-sea corals (DSC). The project included two parts: 1) a modern calibration study; 2) a survey of d15N in the fossil corals from the Southern Ocean and comparison with previously published records of the diatom- and foraminifera-bound del15N.

Summary of findings

A survey of modern coral specimens (Desmophyllum dianthus) from disparate oceanographic environments, each chosen to represent a distinct del15N signature of PON exported from the euphotic zone showed strong statistical correlation between the coral-bound ON (CB-del15N) and del15N of regional export PON (Wang et al., 2014), establishing the fidelity of CB-del15N proxy.

In the second phase, the research group generated a set of time-resolved records of del15N in fossil D. dianthus from the Subantarctic (south of Tasmania and northern Drake Passage) and Antarctic (southern Drake Passage) regions of the Southern Ocean, spanning 40Ka through the present (Wang et al., 2017). In the modern Southern Ocean, the surface nutrients (including nitrate) are not fully consumed, resulting in leakage of deeply sequestered CO2 to the atmosphere. Incomplete nitrate consumption is manifested in low del15N of the exported modern PON. Wang et al. (2017) found that in both Southern Ocean regions the average CB-del15N during Last Glacial Maximum (LGM) was 4 to 5 permil higher than today. This finding provided a strong proof for the previously proposed hypothesis of the more efficient biological pump in the Southern Ocean, driving lower pCO2 during the ice ages. Stronger vertical stratification in the Antarctic and higher iron supply in the Subantarctic zones are the two likely reasons for the more efficient surface nitrate uptake during the LGM than occurs in the modern Southern Ocean.

The trends defined by the CB-del15N in the Southern Ocean corals were comparable to the previously published del15N records of diatom- and foraminifera-bound ON from both the Antarctic and Subantarctic zones, validating the reliability of the fossil deep-sea corals as paleo-archives. However, higher temporal resolution afforded by the DSC revealed a previously unnoticed feature: the CB-del15N in the Antarctic Zone continued to decrease through the Holocene, pointing to the ongoing decline in the nitrate uptake efficiency. One possible mechanism driving this change is the intensifying overturning of the Southern Ocean, which might have contributed to the rise in atmospheric pCO2 since 8 kyr.

For more information see the NSF award page