We would like to let you know that An Internally Consistent Dataset of δ13C-DIC Data in the North Atlantic Ocean (NAC13v1) is now available for download from CDIAC. The dataset has undergone strict quality control. It includes all in all 6068 samples, originating from oceanographic research cruises that took place between 1981 and 2012. The dataset by Becker et al. is currently under review for publishing in Earth System Science Data (ESSD).
During a primary quality control step based on simple range tests obviously bad data has been flagged. In a second quality control step biases between nearby locations of all cruises were quantified through an elaborate crossover analysis; absolute values of biased cruises were adjusted in the data product. The dataset consists of 29 cruises of which 22 could be compared quantitatively for systematic biases through an adequate crossover study. Adjustments were applied to 10 of the 22 cruises. Based on this analysis the internal consistency of this dataset is estimated to be 0.017‰.
Details of the dataset and quality control can be found in the publication under review for ESSD:
Becker, M., Andersen, N., Erlenkeuser, H., Humphreys, Matthew. P., Tanhua, T., and Körtzinger, A.: An Internally Consistent Dataset of δ13C-DIC in the North Atlantic Ocean – NAC13v1, Earth Syst. Sci. Data Discuss., doi:10.5194/essd-2016-7, in review, 2016.
The CDIAC dataset prepared by Alex Kozyr (Oak Ridge National Laboratory, USA) can be downloaded from HERE.
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.
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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