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Priming the ocean’s carbon pump

March 27, 2019

Biodesign Institute oceanographer Susanne Neuer researches the microscopic organisms that drive the ocean’s absorption of carbon dioxide out of the atmosphere

When it comes to climate change and carbon reduction, Susanne Neuer is thinking small — extremely small.

The Arizona State University biological oceanographer is an expert on marine phytoplankton, microscopic algae found in the sunlit zone of waters all over the globe. As Neuer is quick to point out, phytoplankton may be small — too small individually to be seen with the naked eye — but they are mighty. Their size belies their critical importance to the biological carbon pump, the primary biological mechanism in the ocean’s absorption of vast quantities of carbon dioxide from the atmosphere.

“The oceans take up a quarter to a third of all CO2 emissions,” she said. “Phytoplankton are one of the key players for how that works.”

As CO2 emissions have soared, the ocean’s role as a carbon lockbox has become ever more critical. Neuer’s research examines how different types of phytoplankton prime the ocean’s biological carbon pump — and how climate change might affect their ability to keep the pump running.

“The chemistry of the ocean is changing,” she said. “We don’t know yet what the consequences will be.”

Exploring the ‘world within a drop’

NeuerNeuer is also a professor in the School of Life Sciences and a senior sustainability scientist in the Julie Ann Wrigley Global Institute of Sustainability at ASU. has always been drawn to the “world within a drop.” During her childhood in Germany, she spent summers in the waters of the Mediterranean Sea, exploring life below the surface. At 13, she saved up to buy her first microscope so she could examine water samples she drew from local ponds.

“The microscope opens up this whole other world that you can’t see otherwise,” she said.

Her academic career took her between Europe and the U.S., with early fieldwork in the Canary Islands. She came to ASU in 2004 and became tenured faculty in 2008, bringing an expertise that might seem out of place in the dry desert of Maricopa County, 350 miles from the nearest ocean.

But she notes that the delicate balance of life in the desert parallels increasing “ocean deserts” from the perspective of climate change. And distance hasn’t deterred her from continuing work on a subject that captivated her: the biological carbon pump.  

The biological carbon pump starts with a process that all schoolchildren learn about in science class: photosynthesis. Marine phytoplankton use sunlight to absorb carbon dioxide that has dissolved into the water and convert it into carbon in their bodies.

“A fraction of those phytoplankton is grazed by larger zooplankton, and their carbon is incorporated into fecal pellets that sink,” Neuer explained. “Phytoplankton don’t need to die to aggregate; their cells are tiny, no matter if alive or not, so they float. Those that aggregate into larger particles, called marine snow, become heavy enough to sink to the depths of the ocean. The carbon in those particles and pellets is removed from contact with the atmosphere for tens to many hundreds of years.”

The pump is by no means a closed system. Bacteria, nutrient levels, even dust borne on the wind from the Sahara Desert and dropped in the ocean all exert an influence. To identify the elements and types of phytoplankton at work in the pump, Neuer plies the waters of the Sargasso Sea, a region of the North Atlantic off Bermuda.

Sargasso Sea

Susanne Neuer's research team works in the Sargasso Sea, a vast patch of ocean named after a free-floating seaweed called Sargassum. It hosts hatching and feeding grounds for many fish, including eel and tuna, with microscopic phytoplankton at the basis of the food web. Photo by Doug Bell

Oceans in the lab

Neuer’s current research, funded by a National Science Foundation grant, focuses on the tiniest of phytoplankton, particularly picocyanobacteria, which thrive in the nutrient-poor Sargasso Sea. Previously, scientists considered them too small to play a role in the biological carbon pump. But Neuer’s DNA analysis of the particles collected in her traps found that picoplankton overcome not only their size but lack of nutrients by sinking into the deep ocean. Her research team also discovered that some species produce a slimy substance called transparent exopolymeric particles, which creates aggregates heavy enough to sink.

“As the air and oceans warm, the projection is that we’ll have more of these smallest of cells that can deal better with low-nutrient situations,” Neuer explained. “These little guys will become more important.”

Back in Neuer’s lab on ASU’s Tempe campus, second-year environmental life sciences PhD student Bianca Nahir Cruz puts picocyanobacteria through the paces in roller tanks. These “oceans in the lab” simulate the long drop through the water column to the ocean floor. Cruz is studying how picocyanobacteria make the aggregates that eventually sink as marine snow.

“We know that marine snow in its natural environment is a complete community, with a plethora of microbial interactions,” Cruz said. “We want to further study those interactions.”

Neuer’s NSF grant, “Aggregation of Marine Picoplankton,” is the first awarded to ASU’s new Biodesign Center for Fundamental and Applied Microbiomics (CFAM).

“Being a biological oceanographer here in the desert can be isolating,” she said. “So it is wonderful to have this community of scientists who all have microbes in mind.”

Tiny microbes, enormous importance

Among them is her partner on the NSF grant, Hinsby Cadillo-Quiroz. His team specializes in deciphering the roles of microbes in carbon cycling. Their fieldwork usually takes them to compact soil survey sites in the Amazon rainforest. He’s excited to work with Neuer on such a dramatically different site and scale.

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The Neuer lab uses particle traps (pictured) to collect sinking aggregates in the Sargasso Sea. Picocyanobacteria and other small phytoplankton can be identified in the aggregates. 

“Microbes have the power to change the world we live in,” he said. “The carbon pump can be driven by trillions of microbes working at very small scales, perhaps a few micromillimeters, but they have large-scale consequences.”

Neuer is collaborating with other colleagues beyond CFAM. She plans to include ASU undergraduates in her first joint experiments with the Bermuda Institute for Ocean Sciences to investigate larger planktonic animals in the Sargasso Sea and their role in helping phytoplankton aggregate.

“When most people think of the ocean, they think of large creatures, like whales, dolphins or turtles,” she said. “But in reality, the ocean is run by microbes. The enormous importance of these tiny organisms is unbelievable.”

Written by Kristin Baird Rattini, who has shined a spotlight on fascinating people and places for several national publications, including National Geographic Books, Discover, People, Fodor’s, American Way and U.S. News & World Report. This story originally appeared in the spring 2019 issue of ASU Thrive magazine. 

Top photo: Probing the world of microbes, Susanne Neuer (right) and PhD student Bianca Nahir Cruz observe different types of phytoplankton cultures in their ocean lab. Photo by Jarod Opperman/ASU

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Forget balance

March 27, 2019

Instead, try these 5 ways to live in sync with your well-being

Editor's note: This piece was written by May Busch, senior adviser and executive in residence in ASU’s Office of the President. She is also a professor of practice in the W. P. Carey School of Business and chairs the Idea Enterprise. Find her at

I know it sounds sacrilegious, but I don’t believe in work-life balance. I agree that it’s important to have a life, and that it’s hard, because most of us have too many competing priorities and too little time.

May Busch

But I don’t believe in work-life balance because it’s an outdated and overrated concept that’s impossible to achieve for most of us. Instead, I focus on a feeling of well-being and of being “in sync” with yourself. This involves five aspects:

1. Being conscious

This is about knowing what you want, exercising your free will and making conscious decisions about how to spend your time and energy.

When we make conscious choices, we have an excellent chance for our actions to be in alignment with what truly matters to us.

For example, my family is hugely important to me, yet I used to keep my head down and work until the task was done, no matter how late I had to stay. Without realizing it, I got myself in a situation where I hadn’t had dinner with my family for months. And I only noticed when my husband got angry with me about it.

Then my boss sat me down and told me he was concerned about my working too much. He pretty much ordered me to leave the office in time to be home for dinner twice a week, and to come in late after taking the kids to school twice a month. I’m lucky to have had a great boss to help me become more conscious about my choices. If you don’t have a boss like I did, you must learn to do this for yourself.

You’ll be in alignment, which leaves no room for debilitating and draining emotions like worry and regret.

2. Oscillating through time

Recognize that you’re going to be going through different wave patterns during your day, your week, your year. In fact, that’s optimal rather than targeting a static level of balance and staying at that.

The former allows you to have the whole range of highs and lows, where the latter focuses on staying at a moderate level. And as Oscar Wilde said, “Everything in moderation, including moderation.”

For me, that meant being able to go all out on my business during a big three-week project, but then being able to take a break or a few days off to be with my family later in the month.

It’s about achieving your optimal mix of activities over a longer time horizon, rather than insisting on “balancing the books” every day or every week, which can drive you crazy.

3. Getting a dose of joy every day

When I was getting stressed out at work, my mother used to tell me to take a minivacation every day; just closing my eyes for two to five minutes and imagining myself in my favorite vacation spot. It really did make me feel better!

This is the same idea, only it’s about joy rather than peace.

Start by identifying those small simple things that make your heart sing and make sure you get some of it each day.

For me, it can be as simple as playing a favorite song at full blast, or dancing. These days, you can plug in your iPod equivalent and rock out for the length of a song pretty much anywhere. I was usually able to duck into a conference room, but if you can’t, then worst case, there’s always the facilities!

4. Reframing

This is about shifting your mindset to a more positive way of looking at whatever situation you’re in.

This is a variation on being conscious. You want to be in charge of the way you frame things so that issues become opportunities, and problems can have solutions.

This “inner game” can either drag us down or pull us up, depending on how well we can reframe things in an energizing way.

As an example, one thing that used to bother me was not being able to be at a performance or sports event for my three children, and not being home to send them to school or welcome them home after school.

Then my mother (who is a pediatrician) told me that this made our children independent. Not only was she right about that, it also made me feel more positive about my choices.

5. Stop over-optimizing

Sometimes we put unnecessary pressure on ourselves by setting up too many constraints. Then it becomes stressful to try to optimize it all, and you end up feeling drained.

I remember trying to keep everyone happy simultaneously — my boss, team, husband, three kids and even the dog. Plus, living up to standards of home decoration, housekeeping and other social pressures. My own well-being wasn’t even on the list.

Some of the things I did in the name of satisfying people didn’t even matter to them, like folding the kids’ laundry or personally sewing their Halloween costumes when I had million-dollar deals going on at work. Or feeling like I had to attend every client meeting, even if it meant taking two red-eye flights back to back.

Over the years, my husband and I have been reducing the number of constraints by getting clear on what really matters to each of us, and culling the rest.

For example, we’ve called a “truce” on celebrating Valentine’s Day since neither of us cared that much about what is essentially a fabricated holiday. And we live with a messier house than either of us was brought up in.

So stop torturing yourself about work-life balance, and start focusing on having a feeling of well-being and living your life “in sync” with who you are and what really matters to you.

If that involves a big commitment in one area and less in another for now, go with it. You will keep oscillating and adjusting, because life isn’t static. It’s progressive.

This story originally appeared in the spring 2019 issue of ASU Thrive magazine. Also visit Busch's blog at for more ideas and inspiration.