tag:blogger.com,1999:blog-2313427464944392482.post8305531242962414580..comments2024-03-25T05:30:23.847+11:00Comments on HotWhopper: WUWT trips over p's and H's in the oceanSouhttp://www.blogger.com/profile/08818999735123752034noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-2313427464944392482.post-4203134648347058952014-11-26T12:42:20.360+11:002014-11-26T12:42:20.360+11:00Hi, I just noticed your response! I asked the folk...Hi, I just noticed your response! I asked the folks in my lab and they said it all boils down to the crystal structure, surface area and inclusions. The aragonite crystal structure has a larger surface area to volume than calcite thus making more area available for dissolution. I don't think there's been a lot of work in this area recently because it's more of a mineralogy question. I did however find this paper (of course my labmates told me to look it up myself) from the 1950's explaining the difference. <br /><br />http://pubs.acs.org/doi/abs/10.1021/ja01566a001<br /><br />They also mentioned that inclusions from various other minerals can also contribute to instability. I was able to find a paper about the role of magnesium in calcite/aragonite formation and I'm sure there's more out there.<br /><br />http://www.sciencedirect.com/science/article/pii/0016703775901027<br /><br /> Feel free to email me at the address found on my school profile page if you have anymore questions. Cheers!<br /><br />https://www.sfos.uaf.edu/people/profile.php?uid=2844Chase Shttps://www.blogger.com/profile/04659478289426350280noreply@blogger.comtag:blogger.com,1999:blog-2313427464944392482.post-7248827751817542022014-11-15T15:10:02.268+11:002014-11-15T15:10:02.268+11:00Taro Takahashi painstakingly-collected and analyse...Taro Takahashi painstakingly-collected and analysed surface ocean carbon work is the foundation of much of our understanding of the carbon cycle and ocean acidification. It boggles the mind that that WUWT denizens dismiss his work as based on "grant-seeking", instead of what it really is. A single-minded search for answers about how our earth works and how mankind's actions are changing it. <br /><br />As for solubility of calcium carbonate and related ionic structures, Bruce Railsback has produced and instructive plot showing the solubility of the important structures - http://www.gly.uga.edu/railsback/Fundamentals/820HMC-LMCSolubilities05LS.pdfAnthony Davidhttps://www.blogger.com/profile/02513872551156179165noreply@blogger.comtag:blogger.com,1999:blog-2313427464944392482.post-5975481920034192352014-11-13T01:47:13.604+11:002014-11-13T01:47:13.604+11:00If you happen to have the answer, could you please...If you happen to have the answer, could you please tell me why aragonite is more sensible to pCO2 ? A question of greater reactive surface compared to calcite, or something linked to the crystalline organisation ? <br /><br />Thanks in advance ! My chemistry is (unfortunately) far behind me, but I'm curious :) And wikipedia doesn't help me in this case<br /><br />bratislanoreply@blogger.comtag:blogger.com,1999:blog-2313427464944392482.post-49937921976190578802014-11-12T05:17:30.046+11:002014-11-12T05:17:30.046+11:00Sou, I'm sure you will discuss this in your up...Sou, I'm sure you will discuss this in your upcoming article but I just want to add there's two forms of calcium carbonate. Calcite (most larger shell building organisms) and aragonite which is much more sensitive to increased pCO2. Here in Alaska, aragonite shell builders account for most of a juvenile salmons diet and unfortunately we're already seeing undersaturated water with respect to aragonite. <br /><br />http://www.sciencedirect.com/science/article/pii/S0079661114001141<br /><br />We're also getting a handle on OA in a coastal/nearshore sense for southeast AK. Unfortunately the second paper that describes what these regions are going to be like in 50 years isn't out yet (it will be soon, I work next to the person writing it), but I can tell you that we expect to see undersaturated water with respect to aragonite at all depths during all times of the year. In other words AK coastal waters especially in regions of high freshwater runoff are f**ked no matter what we do. First paper below. <br /><br />http://www.sciencedirect.com/science/article/pii/S0272771414000663Chase Shttps://www.blogger.com/profile/04659478289426350280noreply@blogger.com