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Professor Wennberg Named as AAAS Fellow

01-27-22

Paul O. Wennberg, R. Stanton Avery Professor of Atmospheric Chemistry and Environmental Science and Engineering; Executive Officer for Environmental Science and Engineering; Director, Ronald and Maxine Linde Center for Global Environmental Science, has been named as a fellow of the American Association for the Advancement of Science (AAAS) for major scientific advances in atmospheric chemistry. AAAS Fellows are a distinguished cadre of scientists, engineers, and innovators who have been recognized for their achievements across disciplines, from research, teaching, and technology, to administration in academia, industry, and government, to excellence in communicating and interpreting science to the public. [Caltech story]

Tags: honors ESE Paul Wennberg

Wennberg Lab Shows How Wildfire Smoke Increases Ozone Pollution

12-09-21

Using data gathered from a specially equipped jet that spent a month flying through and studying wildfire plumes, scientists have a better understanding now of how wildfire smoke impacts air quality. "Of course it is well known that wildfires lower air quality. But it's important to understand the chemical and physical mechanisms by which they do so that we can more effectively forecast how individual fires will impact the communities downwind of them," says Paul O. Wennberg, R. Stanton Avery Professor of Atmospheric Chemistry and Environmental Science and Engineering; Executive Officer for Environmental Science and Engineering; Director, Ronald and Maxine Linde Center for Global Environmental Science. [Caltech story]

Tags: research highlights ESE Paul Wennberg Lu Xu

Measuring Ventilation to Quantify COVID-19 Risk

04-26-21

There are many different factors that play into models of COVID-19 transmission. One of these factors is ventilation of indoor spaces. A cross-disciplinary group of Caltech researchers as well as members of the Institute's facilities team are adapting technology used by geochemists and atmospheric scientists to survey ventilation rates in buildings across campus. [Caltech story]

Tags: research highlights ESE Paul Wennberg Alex Sessions Elizabeth Niespolo John Crounse Ted Present Nathan Dalleska

Scientists Discover Unexpected Side Effect to Cleaning Up Urban Air

12-19-17

For decades, efforts to reduce air pollution have led to cleaner air in U.S cities like Los Angeles, with subsequent improvements in public health. Those efforts have targeted both nitric oxides and hydrocarbons. Hydrocarbons are emitted from many sources including gasoline-powered cars, trucks, solvents, cleaners used both at home and in industrial settings, and even trees.  Professor Paul O. Wennberg and colleagues have found that there is another chemical pathway for forming organic hydroperoxides—one that occurs at nitric oxide levels substantially higher than can be found in the atmosphere over unpopulated regions. "This is chemistry that does not exist in any of the models of how nitric oxide and hydrocarbons interact," says Professor Wennberg. [Caltech story]

Tags: research highlights ESE Paul Wennberg

Professor Wennberg Elected to the National Academy of Sciences

05-02-17

Paul O. Wennberg, R. Stanton Avery Professor of Atmospheric Chemistry and Environmental Science and Engineering, as been elected to the National Academy of Sciences in recognition of his distinguished and continuing achievements in original research. His work applies traditional physical chemistry techniques to study the mechanisms of chemical transformation in the earth's atmosphere and in the carbon cycle. This research has helped create the Total Carbon Column Observing Network, which measures the distribution of greenhouse gases across the globe. [Caltech release]

Tags: honors research highlights ESE Paul Wennberg NAS

Tools and Techniques to Track and Study Methane

01-19-17

Methane is less prevalent in the atmosphere than fellow greenhouse gas carbon dioxide (CO2), but it presents more difficult challenges for researchers attempting to study it. Professor Wennberg, is working with colleagues from across Caltech to study methane and its effects on the globe and to pioneer tools and techniques needed to identify, track, and characterize the gas and its sources. One such colleague is Professor Vahala who has paved the way for the miniaturization of high-resolution spectrometers. His new soliton-based system is the basis for a new collaboration with Professor Frankenberg to apply dual-comb spectrometer to methane tracking and analysis. [Caltech story]

Tags: APhMS research highlights ESE Paul Wennberg Kerry Vahala Christian Frankenberg

Aliso Canyon, Methane, and Global Climate

04-18-16

The Aliso Canyon underground storage facility for natural gas in the San Fernando Valley—the fourth largest of its kind in the United States—had one of its wells blow out on October 23, 2015, leading to a large release of methane. In a recent conversation, Professor Paul Wennberg discusses enormous methane and carbon dioxide (CO2) emissions, and their troubling implications for global climate. “If we could really knock the methane emissions back to what they were before people started emitting methane, it would be a large change. It would be a half a watt per meter squared. The total global warming would drop by around 25 percent,” Professor Wennberg explains. [Caltech story]

Tags: research highlights ESE Paul Wennberg

Highly Cited Researchers

09-11-15

The Thomson Reuters compilation of the most highly cited researchers— those in the top 1%—include EAS professors Harry Atwater, William Goddard, Babak Hassibi, Joel Tropp, Kerry Vahala, and Paul Wennberg. This compilation aims to identify researchers with exceptional impact on their respective fields. [Detailed information on the methodology]

Tags: APhMS EE honors Harry Atwater CMS ESE Paul Wennberg William Goddard Joel Tropp Kerry Vahala Babak Hassibi

Tracking Photosynthesis from Space

05-04-15

Professor Paul Wennberg and colleagues have developed a new technique to analyze plant productivity using data from NASA's Orbiting Carbon Observatory-2 (OCO-2) satellite. To perform photosynthesis, the chlorophyll in leaves absorbs sunlight and a small fraction of the absorbed light is reemitted as near-infrared light. This reemitted light makes the plants appear to glow—a property called solar induced fluorescence (SIF). "The measurements of SIF from OCO-2 greatly extend the science of this mission", says Professor Wennberg. "OCO-2 was designed to map carbon dioxide, and scientists plan to use these measurements to determine the underlying sources and sinks of this important gas. The new SIF measurements will allow us to diagnose the efficiency of the plants—a key component of the sinks of carbon dioxide." [Caltech story]

Tags: research highlights ESE Paul Wennberg

Highly Cited

06-20-14

The Thomson Reuters compilation of the most highly cited researchers— those in the top 1%—from the period 2002–2012 include EAS professors Harry Atwater, Richard Murray, Joel Tropp, John Seinfeld, Kerry Vahala, and Paul Wennberg. Other Caltech professors were also among the top 1%—including Colin Camerer, Mark Davis, Richard Ellis, William Goddard, Robert Grubbs, Hiroo Kanamori, Jeff Kimble, John O’Doherty, and Charles Steidel. This compilation aims to identify researchers with exceptional impact on their respective fields.  [Detailed information on the methodology]

Tags: APhMS honors MCE Harry Atwater CMS ESE Paul Wennberg John Seinfeld Joel Tropp Kerry Vahala Richard Murray