the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
| 19 Mar 2024
Effects of CO2 on the nitrogen isotopic composition of Trichodesmium and Crocosphaera
Abstract. Biological nitrogen (N2) fixation is the main input of fixed nitrogen to ecosystems on Earth. Nitrogen isotope fractionation during this process is a key parameter for understanding the nitrogen cycle, however, relatively little is known about its regulatory mechanisms. Here we examine the effects of varying CO2 concentrations on biomass δ15N signatures of the cyanobacterial diazotrophs Trichodesmium erythraeum and Crocosphaera watsonii. We show that these organisms produce biomass up to ~3 ‰ lower in δ15N under either decreased (~180 µatm) or elevated (~1400 µatm) CO2 concentrations in comparison to modern levels (~380 µatm). Our results pointed towards changes in nitrogenase enzyme efficiency in response to CO2 perturbations impacting isotopic fractionation during N2 fixation and thus the biomass δ15N. This study contributes to an improved interpretation of the observed fluctuations in the δ15N records, and thus the past nitrogen cycle on Earth.
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Interactive discussion
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AC1: 'Comment on egusphere-2024-775', Dalin Shi, 29 May 2024
Dear Editor and Editorial Support Team,
We hope this message finds you well. We are writing to formally request the withdrawal of our manuscript entitled “Effects of CO2 on the nitrogen isotopic composition of Trichodesmium and Crocosphaera”, submitted to Biogeosciences on March 15, 2024.
The manuscript was opened for interactive public discussion on March 18, with an initial end date of April 30. However, due to the ongoing challenges in securing suitable reviewers, the discussion period has been extended multiple times.
After communicating with the Editor, we fully understand the difficulties involved in finding suitable and willing reviewers, and we appreciate the great efforts made by the editorial team in this regard. However, considering the time-sensitive nature of our work and the upcoming graduation requirements of our PhD student, we have to make the hard decision to withdraw this manuscript from Biogeosciences and seek publication opportunities through alternative avenues.
Thank you for your understanding and assistance in this matter.
Best regards
Citation: https://doi.org/10.5194/egusphere-2024-775-AC1
Interactive discussion
Status: closed
-
AC1: 'Comment on egusphere-2024-775', Dalin Shi, 29 May 2024
Dear Editor and Editorial Support Team,
We hope this message finds you well. We are writing to formally request the withdrawal of our manuscript entitled “Effects of CO2 on the nitrogen isotopic composition of Trichodesmium and Crocosphaera”, submitted to Biogeosciences on March 15, 2024.
The manuscript was opened for interactive public discussion on March 18, with an initial end date of April 30. However, due to the ongoing challenges in securing suitable reviewers, the discussion period has been extended multiple times.
After communicating with the Editor, we fully understand the difficulties involved in finding suitable and willing reviewers, and we appreciate the great efforts made by the editorial team in this regard. However, considering the time-sensitive nature of our work and the upcoming graduation requirements of our PhD student, we have to make the hard decision to withdraw this manuscript from Biogeosciences and seek publication opportunities through alternative avenues.
Thank you for your understanding and assistance in this matter.
Best regards
Citation: https://doi.org/10.5194/egusphere-2024-775-AC1
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Discussed
Zuozhu Wen
Ruotong Jiang
Tianli He
Thomas Browning
Haizheng Hong
Dalin Shi
This preprint has been withdrawn.
- Preprint
(2143 KB) - Metadata XML
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Supplement
(1878 KB) - BibTeX
- EndNote