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

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

doi: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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May 2016	10	7	0	17
Jun 2016	11	0	11
Jul 2016	79	24	1	104
Aug 2016	32	30	8	70
Sep 2016	13	9	1	23
Oct 2016	13	9	2	24
Nov 2016	12	8	1	21
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Jan 2017	8	11	0	19
Feb 2017	14	17	3	34
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May 2017	26	19	3	48
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Dec 2019	11	11	0	22
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Oct 2020	12	10	2	24
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Mar 2021	25	23	1	49
Apr 2021	8	12	0	20
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Jun 2024	46	14	2	62
Jul 2024	23	9	6	38
Aug 2024	33	6	2	41
Sep 2024	14	6	0	20
Oct 2024	15	19	1	35
Nov 2024	8	8	1	17
Dec 2024	10	21	2	33
Jan 2025	15	16	0	31
Feb 2025	19	26	2	47
Mar 2025	27	7	1	35
Apr 2025	27	18	0	45
May 2025	17	7	1	25
Jun 2025	43	19	0	62
Jul 2025	18	23	3	44
Aug 2025	27	15	1	43
Sep 2025	45	16	2	63
Oct 2025	25	19	6	50
Nov 2025	11	15	1	27

Cumulative views and downloads (calculated since 16 Mar 2016)

Month	HTML	PDF	XML	Total
Mar 2016	91	45	2	138
Apr 2016	33	12	0	45
May 2016	10	7	0	17
Jun 2016	11	0	11
Jul 2016	79	24	1	104
Aug 2016	32	30	8	70
Sep 2016	13	9	1	23
Oct 2016	13	9	2	24
Nov 2016	12	8	1	21
Dec 2016	3	3	0	6
Jan 2017	8	11	0	19
Feb 2017	14	17	3	34
Mar 2017	14	12	2	28
Apr 2017	26	15	3	44
May 2017	26	19	3	48
Jun 2017	21	6	0	27
Jul 2017	15	7	1	23
Aug 2017	3	8	1	12
Sep 2017	11	10	0	21
Oct 2017	4	8	0	12
Nov 2017	12	14	0	26
Dec 2017	5	6	0	11
Jan 2018	9	7	1	17
Feb 2018	24	18	1	43
Mar 2018	13	11	0	24
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May 2018	6	7	0	13
Jun 2018	14	20	0	34
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Mar 2023	23	11	1	35
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May 2024	10	22	2	34
Jun 2024	46	14	2	62
Jul 2024	23	9	6	38
Aug 2024	33	6	2	41
Sep 2024	14	6	0	20
Oct 2024	15	19	1	35
Nov 2024	8	8	1	17
Dec 2024	10	21	2	33
Jan 2025	15	16	0	31
Feb 2025	19	26	2	47
Mar 2025	27	7	1	35
Apr 2025	27	18	0	45
May 2025	17	7	1	25
Jun 2025	43	19	0	62
Jul 2025	18	23	3	44
Aug 2025	27	15	1	43
Sep 2025	45	16	2	63
Oct 2025	25	19	6	50
Nov 2025	11	15	1	27

Latest update: 18 Nov 2025

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 %.