Ocean Acidification is sometimes referred to as Global Warming's Equally Evil Twin. The irony is intentional and fair enough as far as it goes... No single mechanism explains all the mass extinctions in the record and yet changes in ocean chemistry seem to be a pretty good predictor. Ocean Acidification played a role in at least 2 of the Big Five Extinctions: the End-Permian and the End-Triassic. And quite possibly it was a major factor in a third, the End-Cretaceous. ...Why is ocean acidification so dangerous? The question is tough to answer only because the list of reasons is so long. Depending on how tightly organisms are able to regulate their internal chemistry, acidification may affect such basic processes as metabolism, enzyme activity, and protein function. Because it will change the makeup of microbial communities, it will alter the availability of key nutrients, like iron and nitrogen. For similar reasons, it will change the amount of light that passes through the water, and for somewhat different reasons, it will alter the way sound propagates. (In general, acidification is expected to make the seas noisier.) It seems likely to promote the growth of toxic algae. It will impact photosynthesis—many plant species are apt to benefit from elevated CO2 levels—and it will alter the compounds formed by dissolved metals, in some cases in ways that could be poisonous.Of the myriad possible impacts, probably the most significant involves the group of creatures known as calcifiers. (The term calcifier applies to any organism that builds a shell or external skeleton or, in the case of plants, a kind of internal scaffolding out of the mineral calcium carbonate.)...Ocean acidification increases the cost of calcification by reducing the number of carbonate ions available to organisms that build shells or exoskeletons. Imagine trying to build a house while someone keeps stealing your bricks. The more acidified the water, the greater the energy that’s required to complete the necessary steps. At a certain point, the water becomes positively corrosive, and solid calcium carbonate begins to dissolve. This is why the limpets that wander too close to the vents at Castello Aragonese end up with holes in their shells.According to geologists who work in the area, the vents have been spewing carbon dioxide for at least several hundred years, maybe longer. Any mussel or barnacle or keel worm that can adapt to lower pH in a time frame of centuries presumably already would have done so. “You give them generations on generations to survive in these conditions, and yet they’re not there,” Hall-Spencer observed.
Ocean Acidification is sometimes referred to as Global Warming's Equally Evil Twin. The irony is intentional and fair enough as far as it goes... No single mechanism explains all the mass extinctions in the record and yet changes in ocean chemistry seem to be a pretty good predictor. Ocean Acidification played a role in at least 2 of the Big Five Extinctions: the End-Permian and the End-Triassic. And quite possibly it was a major factor in a third, the End-Cretaceous. ...Why is ocean acidification so dangerous? The question is tough to answer only because the list of reasons is so long. Depending on how tightly organisms are able to regulate their internal chemistry, acidification may affect such basic processes as metabolism, enzyme activity, and protein function. Because it will change the makeup of microbial communities, it will alter the availability of key nutrients, like iron and nitrogen. For similar reasons, it will change the amount of light that passes through the water, and for somewhat different reasons, it will alter the way sound propagates. (In general, acidification is expected to make the seas noisier.) It seems likely to promote the growth of toxic algae. It will impact photosynthesis—many plant species are apt to benefit from elevated CO2 levels—and it will alter the compounds formed by dissolved metals, in some cases in ways that could be poisonous.Of the myriad possible impacts, probably the most significant involves the group of creatures known as calcifiers. (The term calcifier applies to any organism that builds a shell or external skeleton or, in the case of plants, a kind of internal scaffolding out of the mineral calcium carbonate.)...Ocean acidification increases the cost of calcification by reducing the number of carbonate ions available to organisms that build shells or exoskeletons. Imagine trying to build a house while someone keeps stealing your bricks. The more acidified the water, the greater the energy that’s required to complete the necessary steps. At a certain point, the water becomes positively corrosive, and solid calcium carbonate begins to dissolve. This is why the limpets that wander too close to the vents at Castello Aragonese end up with holes in their shells.According to geologists who work in the area, the vents have been spewing carbon dioxide for at least several hundred years, maybe longer. Any mussel or barnacle or keel worm that can adapt to lower pH in a time frame of centuries presumably already would have done so. “You give them generations on generations to survive in these conditions, and yet they’re not there,” Hall-Spencer observed.
The stars are brilliant at this time of night and I wander these streets like a ritual I don’t dare to break for darling, the times are quite glorious.I left him by the water’s edge,still waving long after the ship was goneand if someone would have screamed my name I wouldn’t have heard for I’ve said goodbye so many times in my short life that farewells are a muscular task and I’ve taught them well. There’s a place by the side of the railway near the lake where I grew up and I used to go there to burry things and start anew. I used to go there to say goodbye. I was young and did not know many people but I had hidden things inside that I never dared to show and in silence I tried to kill them, one way or the other,leaving sin on my body scrubbing tears off with saltand I built my rituals in farewells. Endings I still cling to. So I go to the ocean to say goodbye.He left that morning, the last words still echoing in my headand though he said he’d come back one day I know a broken promise from a right onefor I have used them myself and there is no coming back.Minds like ours are can’t be tamed and the price for freedom is the price we pay.I turned away from the oceanas not to fall for its pleafor it used to seduce and consume meand there was this one nighta few years back and I was not yet accustomed to farewellsand just like now I stood waving long after the ship was gone.But I was younger then and easily fooledand the ocean was deep and dark and blueand I took my shoes off to let the water freeze my bones.I waded until I could no longer walk and it was too cold to swim but still I kept on walking at the bottom of the sea for I could not tell the difference between the ocean and the lack of someone I loved and I had not yet learned how the task of moving on is as necessary as survival.Then days passed by and I spent them with my work and now I’m writing letters I will never dare to send.But there is this one day every year or sowhen the burden gets too heavyand I collect my belongings I no longer needand make my way to the ocean to burn and drown and start anewand it is quite wonderful, setting fire to my chains and flames on written wordsand I stand there, starring deep into the heat until they’re all gone. Nothing left to hold me back.You kissed me that morning as if you’d never done it before and never would again and now I write another letter that I will never dare to send, collecting memories of loss like chains wrapped around my veins,and if you see a fire from the shore tonightit’s my chains going up in flames. The time of moon i quite glorious. We could have been so glorious.