NDP-096 (2016)

ORNL/CDIAC-162

An Internally Consistent Dataset of δ13C-DIC Data in the North Atlantic Ocean

by M. Becker1,2, N. Andersen3, H. Erlenkeuser3, T. Tanhua1, M.P. Humphreys4, A. Körtzinger1,2,

Prepared by Alex Kozyr5

1GEOMAR, Helmholtz Center for Ocean Research, Kiel, Germany
2Christian Albrecht University Kiel, Kiel, Germany
3Leibniz-Laboratory for Radiometric Dating and Isotope Research, Christian Albrecht University, Kiel, Germany
4Ocean and Earth Science, University of Southampton, Southampton, UK
5Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA

dataNAC13v1 Data Files        PDF file Becker, et al. 2016 (in preparation for ESSD)

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Abstract

Here, we present a δ13C-DIC dataset for the North Atlantic, which has undergone strict quality control. The data, all in all 6569 samples, originate from oceanographic research cruises that took place between 1981 and 2014. During a primary quality control step based on simple r ange tests obviously bad data has been flagged. In a second quality control step systematic biases between of all cruises were quantified through a crossover analysis. The dataset consists of 32 cruises of which 24 could be compared quantitatively for systematic biases through an adequate crossover study. Additive adjustments were applied to 11 of the 24 cruises. Based on this analysis the internal consistency of this dataset is estimated to be 0.017‰.

The NAC13v1.csv file contains the 13C data, a simple quality flag ('δ13Cf', 2: good, 9: bad/not measured) and a 2nd QC-flag ('δ13Cqc', 1: quality controlled, 0: not quality controlled). The NAC13v1_expocode.csv-File contains the allocation of the cruise numbers used in NAC13v1 and their expocodes as well as the respective cruise numbers in GLODAPv2 and CARINA. For this analysis some cruises that belong together were condensed to one, e.g. the TTO-NA cruises (See Table 1).

For more information please have a look at:

Becker, M., Andersen, N., Erlenkeuser, H., Humphreys, M.P., Tanhua, T., and Körtzinger, A.: NAC13v1 - An Internally Consistent Dataset of δ13C-DIC Data in the North Atlantic Ocean, ESSD

Please cite this dataset as:

Becker, M., Andersen, N., Erlenkeuser, H., Humphreys, M.P., Tanhua, T., and Körtzinger, A.: NAC13v1 - An Internally Consistent Dataset of δ13C-DIC Data in the North Atlantic Ocean, ESSD

Table 1. Cruise numbers used in the NAC13v1 dataset with the EXPOCODEs and respective cruise numbers in GLODAPv2 and CARINA.

EXPOCODE CRUISENO CRUISENO_GLODAPv2 CRUISENO_CARINA
06MT19941012 1 37 12
06MT19970515 2.1 42 17
06MT19970707 2.2 44 18
06MT19970815 2.3 45 19
06MT19990711 3.1 46 20
06MT19990813 3.2 47 21
06MT20010507 4 49 23
06MT20030723 5 56 30
06MT20040311 6 58 32
316N19970717 7 260 -999
316N19970815 8 261 -999
316N20030922 9 264 68
316N20031023 10 265 69
33RO19980123 11 341 85
33MW19910711 12 336 -999
33MW19930704.1 13 338 -999
35TH20020611 14 392 108
35TH20060521 15 -999 -999
58JH19920712 16 637 130
58JH19940723 17 642 135
64TR19900417 18 669 154
74DI20120731 19 -999 -999
OMEX1NA 20 -999 187
TTO 21 237 -999
Please cite this data set as:
Becker, M., N. Andersen, H. Erlenkeuser, T. Tanhua, M.P. Humphreys and A. Körtzinger. 2016. An Internally Consistent Dataset of δ13C-DIC Data in the North Atlantic Ocean. ORNL/CDIAC-162, NDP-096. http://cdiac.ornl.gov/oceans/ndp_096/NAC13v1.html Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, US Department of Energy, Oak Ridge, Tennessee. doi: 10.3334/CDIAC/OTG.NAC13v1 
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