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Study: Much of the surface ocean will shift in color by end of 21st century
Climate-driven changes in phytoplankton communities will intensify the blue and green regions of the world’s oceans.
Jennifer Chu | MIT News Office
February 4, 2019
Climate change is causing significant changes to phytoplankton in the world's oceans, and a new MIT study finds that over the coming decades these changes will affect the ocean's color, intensifying its blue regions and its green ones. Satellites should detect these changes in hue, providing early warning of wide-scale changes to marine ecosystems.
Writing in Nature Communications, researchers report that they have developed a global model that simulates the growth and interaction of different species of phytoplankton, or algae, and how the mix of species in various locations will change as temperatures rise around the world. The researchers also simulated the way phytoplankton absorb and reflect light, and how the ocean's color changes as global warming affects the makeup of phytoplankton communities.
The researchers ran the model through the end of the 21st century and found that, by the year 2100, more than 50 percent of the world's oceans will shift in color, due to climate change.
The study suggests that blue regions, such as the subtropics, will become even more blue, reflecting even less phytoplankton — and life in general — in those waters, compared with today. Some regions that are greener today, such as near the poles, may turn even deeper green, as warmer temperatures brew up larger blooms of more diverse phytoplankton.
“The model suggests the changes won't appear huge to the naked eye, and the ocean will still look like it has blue regions in the subtropics and greener regions near the equator and poles," says lead author Stephanie Dutkiewicz, a principal research scientist at MIT's Department of Earth, Atmospheric, and Planetary Sciences and the Joint Program on the Science and Policy of Global Change. “That basic pattern will still be there. But it'll be enough different that it will affect the rest of the food web that phytoplankton supports."
Dutkiewicz's co-authors include Oliver Jahn of MIT, Anna Hickman of the University of Southhampton, Stephanie Henson of the National Oceanography Centre Southampton, Claudie Beaulieu of the University of California at Santa Cruz, and Erwan Monier, former principal research scientist at the MIT Center for Global Change Science, and currently assistant professor at the University of California at Davis, in the Department of Land, Air and Water Resources.
The ocean's color depends on how sunlight interacts with whatever is in the water. Water molecules alone absorb almost all sunlight except for the blue part of the spectrum, which is reflected back out. Hence, relatively barren open-ocean regions appear as deep blue from space. If there are any organisms in the ocean, they can absorb and reflect different wavelengths of light, depending on their individual properties.
Phytoplankton, for instance, contain chlorophyll, a pigment which absorbs mostly in the blue portions of sunlight to produce carbon for photosynthesis, and less in the green portions. As a result, more green light is reflected back out of the ocean, giving algae-rich regions a greenish hue.
Since the late 1990s, satellites have taken continuous measurements of the ocean's color. Scientists have used these measurements to derive the amount of chlorophyll, and by extension, phytoplankton, in a given ocean region. But Dutkiewicz says chlorophyll doesn't necessarily have reflect the sensitive signal of climate change. Any significant swings in chlorophyll could very well be due to global warming, but they could also be due to “natural variability" — normal, periodic upticks in chlorophyll due to natural, weather-related phenomena.
“An El Niño or La Niña event will throw up a very large change in chlorophyll because it's changing the amount of nutrients that are coming into the system," Dutkiewicz says. “Because of these big, natural changes that happen every few years, it's hard to see if things are changing due to climate change, if you're just looking at chlorophyll."
Modeling ocean light
Instead of looking to derived estimates of chlorophyll, the team wondered whether they could see a clear signal of climate change's effect on phytoplankton by looking at satellite measurements of reflected light alone.
The group tweaked a computer model that it has used in the past to predict phytoplankton changes with rising temperatures and ocean acidification. This model takes information about phytoplankton, such as what they consume and how they grow, and incorporates this information into a physical model that simulates the ocean's currents and mixing.
This time around, the researchers added a new element to the model, that has not been included in other ocean modeling techniques: the ability to estimate the specific wavelengths of light that are absorbed and reflected by the ocean, depending on the amount and type of organisms in a given region.
“Sunlight will come into the ocean, and anything that's in the ocean will absorb it, like chlorophyll," Dutkiewicz says. “Other things will absorb or scatter it, like something with a hard shell. So it's a complicated process, how light is reflected back out of the ocean to give it its color."
When the group compared results of their model to actual measurements of reflected light that satellites had taken in the past, they found the two agreed well enough that the model could be used to predict the ocean's color as environmental conditions change in the future.
“The nice thing about this model is, we can use it as a laboratory, a place where we can experiment, to see how our planet is going to change," Dutkiewicz says.
A signal in blues and greens
As the researchers cranked up global temperatures in the model, by up to 3 degrees Celsius by 2100 — what most scientists predict will occur under a business-as-usual scenario of relatively no action to reduce greenhouse gases — they found that wavelengths of light in the blue/green waveband responded the fastest.
What's more, Dutkiewicz observed that this blue/green waveband showed a very clear signal, or shift, due specifically to climate change, taking place much earlier than what scientists have previously found when they looked to chlorophyll, which they projected would exhibit a climate-driven change by 2055.
“Chlorophyll is changing, but you can't really see it because of its incredible natural variability," Dutkiewicz says. “But you can see a significant, climate-related shift in some of these wavebands, in the signal being sent out to the satellites. So that's where we should be looking in satellite measurements, for a real signal of change."
According to their model, climate change is already changing the makeup of phytoplankton, and by extension, the color of the oceans. By the end of the century, our blue planet may look visibly altered.
“There will be a noticeable difference in the color of 50 percent of the ocean by the end of the 21st century," Dutkiewicz says. “It could be potentially quite serious. Different types of phytoplankton absorb light differently, and if climate change shifts one community of phytoplankton to another, that will also change the types of food webs they can support. “
This research was supported, in part, by NASA and the Department of Energy.
Reprinted with permission of MIT News
Sallie Krawcheck and Bob Kulhan will be talking money, jobs, and how the pandemic will disproportionally affect women's finances.
Stress and anxiety therapist Dr. Amelia Aldao suggests waiting 60 seconds before reacting to a stressor, giving your rational mind time to catch up to your emotions.
- Stress is a complex defense mechanism that we experience in relation to either internal or external threats.
- Self-inflicted stress is stress we inflict upon ourselves with our emotional and behavioral responses to certain situations. An example of self-inflicted stress would be your car breaking down on the morning of an important meeting because your "check engine" let had been on, but you ignored it.
- There are a few ways for you to cope with self-inflicted internal and external stressors, put forth by researchers and therapists.
What is “self-inflicted stress”?<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMjg3NDgwMi9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTU5ODUyNzQ5M30.plH9mP77sPf3-un8g7KNIU84ad6zVgKIbQONcopUGK0/img.jpg?width=1245&coordinates=0%2C52%2C0%2C52&height=700" id="ee733" class="rm-shortcode" data-rm-shortcode-id="0ba6b904a1542563f02dfe038f18fe50" data-rm-shortcode-name="rebelmouse-image" alt="concept of stress businesswoman feeling stressed at her desk" />
Stress is a complex defence mechanism that each of us experiences differently depending on our personality and the circumstances of the situation.
Photo by Kite_rin on Shutterstock<p>Stress is an adaptation of a living organism to internal or external threats. It's a complex defense mechanism that each of us experiences in vastly different ways depending on various factors such as personality, causal factors, and circumstance.</p><p>Studies show that positive emotions (happiness, comfort, pleasure, etc) allow us to consider a larger set of options in order to make faster, smarter decisions. The opposite is also true - unpleasant emotions (anger, stress, fear, etc.) overwhelm our rational minds and impact our behavior in ways that damage our ability to make smart, rational choices. </p><p>Stressors can be either external or internal, and this greatly impacts how we react to that stressful situation. </p><p><strong>Examples of self-inflicted internal stress (stress we inflict on ourselves by how we manage expectations, time, relationships, and emotions) can include:</strong> </p><ul><li>Putting pressure on yourself to excel at something within an unrealistic timespan.</li><li>Negative self-talk after not being able to complete something (realistic or not). </li><li>Fear of public speaking, thinking you're going to make a mistake in front of everyone even if you're prepared.</li><li>Not having enough time in the day to complete your "to-do" list and having thoughts of not being good enough because you didn't complete an unrealistic goal. </li><li>An "all or nothing" attitude (example: if I can't get everything on my list done today I just won't do anything at all." </li></ul><p>In more serious situations, these kinds of internal stressors can lead to feelings of anxiety and/or depression. </p><p><strong>Examples of self-inflicted external stress can include:</strong> </p><ul><li>Planning a vacation in a time of budget cuts at work only to discover that your salary has been lowered in a time where you've spent more money than normal. </li><li>Procrastinating to study for an upcoming exam or presentation and then staying up all night the day before. </li><li>Ignoring the "check engine" light in your car only to have it break down in a moment of urgency (picking a child up from school, on your way to a meeting, etc). </li></ul>
How to manage your self-inflicted stress<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yMjg3NDgwMS9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYxOTUxNjY2MX0.UvFSTWkXcFi4qIqv1moPKac3KIPJugywdeSePEw2Upo/img.jpg?width=1245&coordinates=0%2C103%2C0%2C1&height=700" id="c0a57" class="rm-shortcode" data-rm-shortcode-id="6a683cb20ee3a37aa850b32b39560db9" data-rm-shortcode-name="rebelmouse-image" alt="concept stress man squeezing happy face stress ball" />
A tip: wait one full minute before doing anything in reaction to the stressor.
Photo by Obak on Shutterstock<p>Over time, stress can damage areas of your life (adding even more stress) such as you having trouble sleeping, losing your appetite, losing interest in daily activities due to stress. Symptoms that you are stressed can include things like irritability, headaches/migraines, stomach pains, and unbalanced emotions.</p> <p>How do you cope with stress? There are a few different methods that are specifically designed to help you overcome self-inflicted stressors in your life. </p> <p><strong>Take a full 60 seconds of pause before doing anything.<br></strong>The 60 Second Method is simple: wait one minute before doing anything in reaction to the stressor. It can be as simple as that, according to OCD, stress, anxiety and depression therapist <a href="https://www.togethercbt.com/groups" target="_blank">Dr. Amelia Aldao</a>.</p> <p>"In particular," she explains in <a href="https://www.psychologytoday.com/us/blog/sweet-emotion/202003/the-60-second-approach-managing-emotions" target="_blank">this Psychology Today article</a>, "don't follow what the emotion is telling you to do. Don't send that angry text, don't decline the invitation to present at work, don't tell your potential date you're too busy this week…" </p> <p>While this is extremely difficult for some people, pausing before reacting to a stressful situation gives your "rational brain" the ability to catch up. The best thing you can do is "stay with your emotion", according to Dr. Aldao, "but don't act it out." </p> <p>Experiencing the emotions is a good thing, we should never ignore how certain situations (even stressful ones) make us feel - but acting from a place of pure emotion (instead of thinking rationally about a proper action to follow the situation) can be detrimental to our mental health. </p> <p>According to Dr. Aldao, by the end of these 60 seconds, the intensity of your initial emotional reaction to the stressor should have somewhat subsided, allowing you to act from a place of rationality than a place of hasty emotion. </p> <p><strong>Prioritize your schedule and manage your time in a realistic way to motivate yourself.<br></strong>When it comes to internal stressors, much of the time we inflict these upon ourselves with ever-growing to-do lists and agendas that seem impossible to get through. This, in a way, is setting ourselves up for failure, because we aren't giving ourselves realistic goals that can encourage us to keep going.</p> <p>Instead, what you're doing, is designing a system that will make you feel more stressed the more work you do because even if you complete the work, it will seem as though you're falling behind. </p> <p>Instead, you should operate in a prioritization system. This can be done by splitting your to-do list into categories such as immediate (needs to be done in the next 3 hours), average (needs to be done sometime today) and non-critical (can easily be done tomorrow or the next day). </p> <p><strong>Ask for help and accept that you might not be able to accomplish everything on your own (or risk falling apart).<br></strong><a href="https://www.ruthklein.com/" target="_blank">Productivity coach Ruth Klein</a>, who has also authored a book called Time Management Secrets for Working Women, explains that you should start by asking yourself what the top three priorities for the day are. If there are more than three main things, delegate some of your work to someone else or push back deadlines if you can. It takes courage to admit you can't do it all, but ultimately that might be your best option.</p> <p>Waiting too long to ask for help, according to Klein, will eventually lead us into an "overwhelmed crisis" which tends to zap us of all energy and motivation. </p> <p><strong>Acknowledge that some (if not most) of your stress may be self-inflicted and make changes to fix that.<br></strong>While there are external stressors that we have little to no control over, there are lots of times when the stress we feel is self-inflicted. And when stress is self-inflicted it can also be self-solved, even when that feels impossible.</p> <p>When we are managing self-inflicted stress, it can be extremely difficult to see outside of our bubble of worry. We are focused on trying to beat the stress because we don't want to feel stressed - it seems like a solution. But if your stress isn't motivating you to get things done (and is instead actually hindering you from being productive) it's time for you to change how you react to your stress. </p> <p><em>"What can I do to lessen my stress right now?" </em></p> <p><a href="https://www.lessstresscoach.com/2016/12/21/do-you-suffer-from-self-inflicted-stress/" target="_blank">Jamie Sussel Turner</a> (otherwise known as "The Less Stress Coach") explains that asking yourself this question and acknowledging some of the harmful behaviors and emotions you're feeling that are negatively impacting your stress levels can help us re-evaluate the importance of the things we're trying to do. </p>
The coronavirus pandemic has brought out the perception of selfishness among many.
- Selfish behavior has been analyzed by philosophers and psychologists for centuries.
- New research shows people may be wired for altruistic behavior and get more benefits from it.
- Crisis times tend to increase self-centered acts.
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Exploring Morality and Selfishness in Modern Times<div class="rm-shortcode" data-media_id="02eX1Cag" data-player_id="FvQKszTI" data-rm-shortcode-id="45cc6180db791f32683988fb52faff26"> <div id="botr_02eX1Cag_FvQKszTI_div" class="jwplayer-media" data-jwplayer-video-src="https://content.jwplatform.com/players/02eX1Cag-FvQKszTI.js"> <img src="https://cdn.jwplayer.com/thumbs/02eX1Cag-1920.jpg" class="jwplayer-media-preview" /> </div> <script src="https://content.jwplatform.com/players/02eX1Cag-FvQKszTI.js"></script> </div> Philosopher Peter Singer discusses the state of global ethics.
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