Abstract Details
(2020) Hydrological Fluctuations in the Holocene Baltic Sea
Weiss G, Lattaud J & van der Meer M
https://doi.org/10.46427/gold2020.2843
The author has requested that this abstract is not discussed on social media.
The author has not provided any additional details.
14d: Plenary Hall, Tuesday 23rd June 01:21 - 01:24
Gabriella Weiss
Julie Lattaud View abstracts at 3 conferences in series
Marcel van der Meer View abstracts at 9 conferences in series
Julie Lattaud View abstracts at 3 conferences in series
Marcel van der Meer View abstracts at 9 conferences in series
Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.
Submitted by Bernhard Aichner on Monday 22nd June 12:25
Would a shift in the community of alkenone producers necessarily result in changing alkenone patterns, or - in other words - how confident are you that there were no significant communitiy changes throughout the studied period? This is more a general question, I agree that hydrological triggers are the most likely explanation for dD shifts.
Thank you for your question! There are some clear differences in alkenone distributions that align with the respective alkenone-producing groups. For example, the tri-unsaturated isomers which only appear to be produced by Group I species and the shorter chain (C35 and C36) alkenones which seem to be produced solely by Group II species. In addition to this, Longo et al. (2018) proposed a binary mixing model to assess contributions of Group I and II species when both are present. Using their mixing model for our Baltic dataset, Group I species seem to be dominant during the Ancylus Lake phase and there are no large changes during the portion of the phase concurrent with the large isotopic shift. Table 1 of Weiss et al. (2020) https://doi.org/10.1029/2019GC008751 shows the values for Group I and II contribution during the Ancylus Lake phase.
Would a shift in the community of alkenone producers necessarily result in changing alkenone patterns, or - in other words - how confident are you that there were no significant communitiy changes throughout the studied period? This is more a general question, I agree that hydrological triggers are the most likely explanation for dD shifts.
Thank you for your question! There are some clear differences in alkenone distributions that align with the respective alkenone-producing groups. For example, the tri-unsaturated isomers which only appear to be produced by Group I species and the shorter chain (C35 and C36) alkenones which seem to be produced solely by Group II species. In addition to this, Longo et al. (2018) proposed a binary mixing model to assess contributions of Group I and II species when both are present. Using their mixing model for our Baltic dataset, Group I species seem to be dominant during the Ancylus Lake phase and there are no large changes during the portion of the phase concurrent with the large isotopic shift. Table 1 of Weiss et al. (2020) https://doi.org/10.1029/2019GC008751 shows the values for Group I and II contribution during the Ancylus Lake phase.
Sign in to ask a question.