Abstract Details
(2020) Global Contrasts between Oceanic Cycling of Cadmium and Phosphate
Roshan S & DeVries T
https://doi.org/10.46427/gold2020.2225
The author has not provided any additional details.
14m: Plenary Hall, Wednesday 24th June 08:12 - 08:15
Saeed Roshan
Tim DeVries View all 2 abstracts at Goldschmidt2020 View abstracts at 3 conferences in series
Tim DeVries View all 2 abstracts at Goldschmidt2020 View abstracts at 3 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 Gregory de Souza on Wednesday 17th June 08:26
Hi Saeed, really interesting presentation! One thing I am wondering about is the convex-upward relationship between Cd and PO4 that you get when you simulate simultaneous regeneration -- isn't this the opposite of what you would expect? With high Cd:P in high-latitude uptake and low Cd:P at low latitudes, I would have expected a concave-upward relationship like between Si and PO4 (or Zn and PO4), so that result has surprised/confused me. Thanks! Greg
Dear Greg, Thanks for your interest in our presentation! For that simulation we assumed similar regenerations for both Cd and PO4 and a Monod relationship between Cd:P uptake ratio and Cd concentration, implying that deeper regeneration of Cd than PO4 turns a potentially convex Cd-PO4 to a line (observed). Generalizing this idea, and depending on how different the regeneration systematics of two compounds are, this may even lead to a concavity. Therefore, the concave Si-PO4 or Zn-PO4 plots may mainly result from the very different regenerations of these compounds (i.e., Si regenerates much deeper than PO4) than the Si:P uptake systematic. Overall, we'd say that the nuances in the regeneration behavior of compounds (exerted by fundamental mechanisms such as reversible scavenging) can lead to remarkable differences between compounds when they are compared one to one. Regards, Saeed Roshan
Hi Saeed, really interesting presentation! One thing I am wondering about is the convex-upward relationship between Cd and PO4 that you get when you simulate simultaneous regeneration -- isn't this the opposite of what you would expect? With high Cd:P in high-latitude uptake and low Cd:P at low latitudes, I would have expected a concave-upward relationship like between Si and PO4 (or Zn and PO4), so that result has surprised/confused me. Thanks! Greg
Dear Greg, Thanks for your interest in our presentation! For that simulation we assumed similar regenerations for both Cd and PO4 and a Monod relationship between Cd:P uptake ratio and Cd concentration, implying that deeper regeneration of Cd than PO4 turns a potentially convex Cd-PO4 to a line (observed). Generalizing this idea, and depending on how different the regeneration systematics of two compounds are, this may even lead to a concavity. Therefore, the concave Si-PO4 or Zn-PO4 plots may mainly result from the very different regenerations of these compounds (i.e., Si regenerates much deeper than PO4) than the Si:P uptake systematic. Overall, we'd say that the nuances in the regeneration behavior of compounds (exerted by fundamental mechanisms such as reversible scavenging) can lead to remarkable differences between compounds when they are compared one to one. Regards, Saeed Roshan
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