Innovators: Katsuko Saruhashi

Episode Summary

Katsuko Saruhashi was a pioneering Japanese geochemist who made groundbreaking discoveries about carbon dioxide levels in the oceans and ocean-borne nuclear contamination. She was born in 1920 in Tokyo and became the first woman to earn a PhD in chemistry from the University of Tokyo in 1957. At the Meteorological Research Institute, Saruhashi developed a method to measure CO2 levels in seawater. Her research showed oceans emit twice as much CO2 as they absorb, prompting scientists to rethink approaches to global warming. After the US conducted nuclear testing in the Pacific in the 1950s, Saruhashi tracked ocean currents and found radioactive fallout had reached Japan. Her findings led to the 1963 Partial Test Ban Treaty prohibiting atmospheric nuclear tests. Saruhashi engaged the public about her research and supported women in science. She founded the Society of Japanese Women Scientists and the Saruhashi Prize awarded annually to Japanese women in science. She elevated public discourse on scientific issues and helped open up the field to women.

Episode Show Notes

Katsuko Saruhashi (1920-2007) was the first woman to receive a PhD in chemistry in Japan. As a geochemist, she notably detected the dangers of radioactive fallout and how far it can travel.

Episode Transcript

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Stick around after this episode to hear part of her talk or head over to TED Talks Daily from the TED audio collective wherever you listen. SPEAKER_07: Hello from Wonder Media Network. I'm Michelle Monahan and this is Womanica. On July 16th, 1945, the United States detonated the world's first atomic bomb. The city of Hiroshima lies prostrate SPEAKER_04: after the withering blast which wiped out 53,000- Eventually, hundreds of bombs were detonated SPEAKER_07: under the theory that radioactivity would remain localized and not spread to areas of human habitation. Turns out scientists were wrong. Let's give it up for the geochemist who debunked this theory, inspiring the world to rethink their approach to nuclear testing. Let's talk about Katsuuko Saruhashi. Katsuuko Saruhashi was born on March 22nd, 1920 in Tokyo, Japan. Her first name translates to victorious, a name she would certainly live up to. As a child, Katsuuko was shy with a keen sense of curiosity. Legend has it that she was first drawn to science, watching raindrops slide down the window in her classroom. It got her wondering what caused rain. Years later, she would conduct groundbreaking research into acid rain. After high school, Katsuuko worked at an insurance firm. When she was 21, she convinced her parents to let her quit her job to attend the Imperial Women's College of Science. At the time, World War II was leaving many women struggling without husbands or fathers. Women had little professional training to help them take care of themselves. Realizing this, Katsuuko's mother supported her decision to continue on with school and achieve financial independence. Katsuuko graduated from college in 1943 with a degree in chemistry. She joined a geochemistry lab at the Meteorological Research Institute, where she studied carbon dioxide levels in seawater. She developed what is now known as Saruhashi's table, which was the first method for measuring carbon dioxide using temperature, pH, and chlorinity. Saruhashi's table became the global standard and was used by oceanographers and geochemists until the computer age. In 1957, Katsuuko earned her PhD in chemistry from the University of Tokyo, becoming the first woman to do so. She stayed at the Meteorological Research Institute, which became her intellectual home for a total of 35 years. She continued her research into CO2 levels in the ocean and published a seminal paper with her advisor Yasuo Miyake on the topic in 1976. Their research showed that oceans emit twice as much carbon dioxide as they absorb. Prior to their findings, the scientific community believed oceans were able to absorb carbon dioxide. Their discovery prompted scientists to rethink the approach to combating global warming. Katsuuko also made transformative discoveries in ocean-borne nuclear contamination. After World War II, the United States continued to carry out nuclear tests. One of their testing sites was in the Pacific Ocean near Bikini Atoll, which lies 2,300 miles southwest of Japan. In 1954, Japanese fishermen who had traveled downwind of the testing site fell mysteriously ill. The Japanese government asked Katsuuko and her team to investigate. It was difficult to uncover the levels of radioactivity in something as vast as the ocean, but she was up for the challenge. Katsuuko and her team tracked ocean circulation patterns and found that, sure enough, radioactivity was not confined locally to testing sites. In less than two years, radioactive fallout had reached Japan. If the US continued nuclear testing, the entire Pacific Ocean would be contaminated by 1969. Americans were skeptical of Katsuuko's findings. They questioned her methods and were reluctant to end nuclear testing. As a result, they invited her to come to California to test her methodology against what American oceanographer Theodore Folsom had found. Likely due to sexism and anti-Japanese sentiment at the time, when she arrived at the Scripps Institution of Oceanography in California, she was asked not to commute to the institute each day. Instead, she was given a small wooden hut to complete her research in. Despite not having access to the facilities of Scripps itself, Katsuuko completed the test and achieved results that were more accurate than Theodore Folsom's methods. Scientists had no choice but to work off of Katsuuko's findings, which confirmed the need to end atmospheric nuclear testing. While the US conducted underground tests until the early 90s, their last public atmospheric test was in 1962. The following year, the world's nuclear powers signed the Partial Test Ban Treaty, which outlawed atmospheric nuclear testing entirely. Katsuuko's impact grew beyond her research. Due to her belief that scientists cannot operate in a vacuum, she believed they had a social responsibility. She frequently engaged with the public, teaching them about her work and listening to opinions on what scientists should prioritize. She also leveraged her own success to help other female scientists. Early in her career, Katsuuko established the Society of Japanese Women Scientists, a community for women in science to find friendship and support. She also received many honors and awards. She was the first woman elected to the Science Council of Japan and the first woman to receive the Miyake Prize for Geochemistry. In 1981, she founded her own award, the Saruhashi Prize, which is awarded to Japanese women in the natural sciences. She died at the age of 87 on September 29th, 2007. The Saruhashi Prize continues to be awarded each year. For more information, find us on Facebook and Instagram at Womanaka Podcast. Special thanks to Jenny and Liz Capin for inviting me to guest host today's episode. Talk to you tomorrow. SPEAKER_04: You see, my goal was always a seat at the table. It's what women are conditioned to believe success is. And when the people that I'm talking to are not going to be able to do it, and when the chair doesn't fit, when it doesn't reach the table, when it's wobbly, when it's full of splinters, we don't have the luxury of fixing it or finding another one. But we try anyways. We take on that responsibility and we shoulder that burden. Now I've been fortunate enough to sit at a few seats at a few different tables. And what I've learned is when you get the seat, trying to fix the seat won't fix the problem. Why? Because the table was never built for us in the first place. The solution, build better tables. So allow me to be your very own IKEA manual. I would like to present to you a set of guidelines I very eloquently call how to build a table that doesn't suck. 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