Ocean acidification: A climate change issue

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    Ocean acidification has become a problem.

    Ocean acidification is a serious climate change threat and will only intensify if measures are not taken to protect the ocean and its inhabitants. (VOXXI/Laura Sanchez-Ubanell)

    The vast expanse of icy white stretches over the horizon as Brad Seibel and his National Science Foundation team of scientists step out of their shelters to begin the new day.

    Seibel is a professor of Biological Sciences at the University of Rhode Island. He is also a comparative animal physiologist and specializes in the physiology of marine animals in extreme environments.

    The four-person team has traveled to Antarctica to study the “trade-off between aerobic capacity and locomotory activity in an Antarctic pteropod.”

    Oceans are acidifying at an unprecedented rate never before seen in Earth's history.

    A ship passes through the bay on its way back to shore from a day out on the ocean. VOXXI/Laura Sanchez-Ubanell

    In other words, the team observes how sea snails—also known as sea butterflies because of their ability to “fly” through the water—adapt to cold temperatures, low oxygen levels or high carbon dioxide levels. Cold waters accelerate the dynamic between their respiratory functions and physical activity, which makes the −1.8 °C Antarctic waters an optimal research location.

    This study was prompted by increasing evidence and research that the ocean’s acidity level or pH is changing drastically due to the excessive amount of carbon dioxide emissions produced by human interference and influence. This process is known as ocean acidification and holds severe ramifications for the future of both the oceans and its vibrant, yet fragile residents.

    ocean, animal

    Beaches are under threat of erosion from rising sea levels. Combine this with the effects of ocean acidification and we will find less stable beaches and impacts on other organisms, such as turtles and sea birds that depend on beach habitats
    for reproduction. VOXXI/Laura Sanchez-Ubanell

    Since the Industrial Revolution in the mid-eighteenth century, human’s agricultural and industrial activities have caused carbon dioxide concentrations in the atmosphere to increase from 280 to 387 parts per million (ppm). Almost half of this rise has occurred in the last 30 years.

    Most scientists agree that this problem is mostly derived from human emissions. By 2050, atmospheric carbon dioxide levels are estimated to reach more than 500 ppm and possibly 800 by 2100. Earth’s history confirms that oceans have acidified in the past but the main difference from past acidic events is the rate of change. The last time ocean’s acidification levels were this high was 56 million years ago.

    Oceans, rivers, lakes and other major bodies of water absorb about 25 percent of the carbon dioxide in the atmosphere each year, roughly 22 million tons a day. Interestingly, this has helped curb the effect of climate change by removing some of the carbon dioxide that would have ended up in the air and instead storing it in the oceans.

    However, this extra carbon dioxide in the water has increased the acidity of global waters to an unnatural point. Acidity is measured by the pH scale, which determines the acidity or alkalinity of an aqueous solution on a scale between 0 and 14.

    A lower pH level means more acidic. Current and future continued acidification of the ocean will increase the current pH level by 0.3 to 0.4 by the end of the century.

    If environmental changes happen slowly enough, species have the chance for their evolutionary processes to catch up with these changes. Evolutionary adaptation used to be enough for marine organisms to keep up with environmental changes but now humans have expediated the process to the point that marine organisms can no longer keep up.

    “When things happen really rapidly, big extinction happens,” says Chris Langdon, Professor of Marine Biology and Fisheries at University of Miami. Langdon specializes in tropical marine ecology, which includes going out into the field and studying mangroves, coral reefs and sea grass.

    Langdon believes these ecosystems are especially sensitive to climate change. He spends most of his time out in the reefs of the Florida Keys, bringing back test samples to his laboratory at the Rosenstiel School of Marine and Atmospheric Science.

    UM students test the effect of ocean acidification in a controlled environment.

    A lab inside the Rosentiel School tests the effects of high carbon dioxide levels in oceanic waters. VOXXI/Laura Sanchez-Ubanell

    Here, he puts them in the aquarium tanks where he can control the temperature and pH of the water to simulate present day conditions that he and his fellow scientists think will be experienced in the next 50 to 100 years.

    As Langdon talks of his work and his trips out to the reefs, his voice gives away the delight he experiences at the memory of days spent in the waters, in a setting so foreign and frightening to so many. Yet to him and to others who share this connection with the ocean, who devote their minds and body to its discovery and salvation, nothing has ever felt more like home.

    The Rosenstiel School sits just across the water from the undeveloped shore of Key Biscayne, a private residential island. A small, unspoiled beach rests below an elevated porch attached to the university’s bar, known to the locals as Wet Lab, where the patrons are never anything but friendly and fascinating.

    The Rosentiel school offers a serene setting ideal for oceanic research

    A ship rests off the shore of University of Miami’s marine studies school, ready to spring into action at any moment. VOXXI/Laura Sanchez-Ubanell

    Any sound from the nearby bridge is drowned out by the mere beauty of the sunrise, sunsets and every hour in between. The combo of cheap beer, good company and conversation, mesmerizing views and a general atmosphere of calm and serenity makes this hidden-away intellectual hot spot of Miami quite the treasure.

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