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Eswaramoorthi Sellappa Gounder proslijedio/la je Tweet
Discussion open for comments: New analytical and data evaluation protocols to improve the reliability of U-Pb LA-ICP-MS carbonate dating https://doi.org/10.5194/gchron-2019-20 …
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Eswaramoorthi Sellappa Gounder proslijedio/la je Tweet
Nice publication on oxidation of green rust minerals by photoautotrophic Fe(II)-oxidizing bacteria - congratulations to Xiaohua Han, guest student in our lab with a fellowship from the Chinese Scholarship Council: https://www.geochemicalperspectivesletters.org/article2004
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Eswaramoorthi Sellappa Gounder proslijedio/la je Tweet
(1/3) Our new paper “A new sea surface temperature proxy based on bacterial 3-hydroxy fatty acids” is out in Organic Geochemistry: https://www.sciencedirect.com/science/article/pii/S0146638020300103 … by
@YiYangcug with@drbendleJ, Dr Canfa Wang, Prof Shucheng Xie and otherspic.twitter.com/10HqSukpuh
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Eswaramoorthi Sellappa Gounder proslijedio/la je Tweet
20 years ago only geochemists thought that methane could be anaerobically oxidised (i.e. by something other than O2). Now - after the initial discovery of those mediating AOM with sulfate - we see a whole suite of such organisms, Mn reducers being the latest. Great work!https://twitter.com/SeepExplorer/status/1222279120752730113 …
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Eswaramoorthi Sellappa Gounder proslijedio/la je Tweet
Our postdoctoral Newton International Fellowships scheme is now open. If you are a non-UK scientist at an early stage of your research career and wish to conduct research in the UK, apply before 26 March 2020. Find out more https://bit.ly/38uLCHE
#RSgrantspic.twitter.com/Kg7fwsnO78
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Probably, the large-scale involvement of ice reduces the transient time required for glacial to interglacial transition. The extension of ice diminishes during interglacials. Thus, the change from interglacial to glacial periods might occur slowly due to active negative feedback.
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The intensity of the negative feedback mechanisms, namely the “sea-ice precipitation feedback” and “sea ice-insulation feedback”, limits the rate of thermalization. And, that results in asymmetrical transitions between icehouse and greenhouse states.
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Then, “thermalization” - https://lnkd.in/f3ANm_k - the tendency for energy to spread throughout a system - takes the lead, and that slows down the rapid change in the climate.
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I believe that at the state of criticality during climate transitions, the energy condenses within a specific domain when the “tipping point” is reached.
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Transient processes are non-linear and chaotic. However, an order exists within that chaos in the realm of “Universality Principle" -https://lnkd.in/fHKzgys
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The net “heat content” of the Earth system is a critical parameter in climate transitions. Whereas the transition from interglacial to glacial period is also a transient process (Ramadhin and Yi, 2020; https://doi.org/10.5194/esd-11-13-2020 …)
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Regarding climate transitions, further scenario emerges from another recent work (Shackleton et al., 2020; https://doi.org/10.1038/s41561-019-0498-0 …) that describes the change from glacial to interglacial period.
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A climate model that invokes this connectivity shall be able to explain rapid climate transitions like the one during Palaeocene Eocene Thermal Maximum (PETM).
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These two negative feedback mechanisms invoked to explain long glacials, and short interglacials control the extension of the pace of ice cover development. By influencing the growth of ice cover, these two negative feedback mechanisms control the connectivity of the ice ponds.
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[Note: The mechanisms that become dominant during climate transitions are sufficient and enough to understand and apply the "Universality Principle".]
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A recent work - https://lnkd.in/fCdBh_y - suggested that "the sea ice–precipitation feedback is one of the first of many feedbacks to become dominant during glaciations" ....... "The second dominant feedback proposed is sea ice–insulation feedback."
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Now, the mechanisms that are fundamental to the application of the Universality Principle emerges.
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In a three-part post - https://lnkd.in/fA9bB_Z - I have opined that the connectivity of the ice ponds may serve as a scale-invariant parameter that takes the lead role in climate transitions. Thus, the "Universality Principle" can be applied to explain rapid climate transitions.
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.....This leads directly to a universal relationship between adsorption energies and catalytic activity, which is used to pinpoint what it is that determines the best catalyst for a given reaction".
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"for a class of catalytic reactions there is a universal, reactant independent relation between the reaction activation energy and the stability of reaction intermediates. ....
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