Evaluation of 4 years of continuous δ13C(CO2) data using a moving Keeling plot method

Vardag, Sanam Noreen; Hammer, Samuel; Levin, Ingeborg

doi:https://doi.org/10.5194/bg-13-4237-2016

Articles | Volume 13, issue 14

https://doi.org/10.5194/bg-13-4237-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/bg-13-4237-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 13, issue 14

Research article

|

26 Jul 2016

Research article |

| 26 Jul 2016

Evaluation of 4 years of continuous δ¹³C(CO₂) data using a moving Keeling plot method

Sanam Noreen Vardag, Samuel Hammer, and Ingeborg Levin

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Final revised paper (published on 26 Jul 2016)
Preprint (discussion started on 16 Mar 2016)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC1: 'Review of “Evaluation of four years continuous 13C(CO2) data using a running Keeling approach” by S. N. Vardag, S. Hammer and I. Levin', Anonymous Referee #1, 01 Apr 2016
- AC1: 'Response to anonymous referee #1', Sanam Noreen Vardag, 27 Jun 2016
RC2: 'Review for Vardag et al', Anonymous Referee #2, 15 Apr 2016
- AC2: 'Response to anonymous referee #2', Sanam Noreen Vardag, 27 Jun 2016

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

ED: Reconsider after major revisions (06 Jul 2016) by Fortunat Joos

AR by Sanam Noreen Vardag on behalf of the Authors (08 Jul 2016) Author's response Manuscript

ED: Publish as is (08 Jul 2016) by Fortunat Joos

AR by Sanam Noreen Vardag on behalf of the Authors (09 Jul 2016)

Short summary

Using a synthetic dataset, we show how to best determine the mean source signature, δ_S, at high temporal resolution using continuous CO₂ and δ¹³C(CO₂) data. We apply this method to measured data from Heidelberg and find a distinct seasonal cycle of δ_S. Disentangling this record into its source components requires the isotopic end members of CO₂ from the biosphere and those from the fuel mix. They can be estimated from the δ_S record, but only when their relative share is close to 100 %.