Andrew Dessler | |
---|---|
Born | 1964 (age 59–60) Houston, Texas, U.S. |
Alma mater | Rice University, Harvard University |
Scientific career | |
Fields | Atmospheric Science, climatology |
Institutions | University of Maryland, Texas A&M University |
Thesis | In situ stratospheric ozone measurements [1] (1994) |
Doctoral advisor | James G. Anderson |
Website | andrewdessler |
Andrew Emory Dessler (born 1964) is a climate scientist. He is Professor of Atmospheric Sciences and holder of the Reta A. Haynes Chair in Geoscience at Texas A&M University. He is also the Director of the Texas Center for Climate Studies. His research subject areas include climate impacts, global climate physics, atmospheric chemistry, climate change and climate change policy. [2]
Dessler was born in 1964, in Houston, Texas to Alex Dessler and Lorraine Barbara Dessler. [3] He received a B.A. in physics from Rice University in 1986 and an M.A. and Ph.D in chemistry from Harvard University in 1990 and 1994. [2] [4] His doctoral thesis was titled In situ stratospheric ozone measurements. [1]
Dessler worked in the energy group at The First Boston Corporation doing mergers and acquisitions analysis in the mid-1980s. [5] He left his job as an investment banker on Wall Street in 1988 to go to graduate school in chemistry. [6] After receiving his Ph.D. in 1994, Dessler did two years of Postdoctoral research at NASA's Goddard Space Flight Center and then spent nine years on the research faculty of the University of Maryland from 1996 to 2005. [7] Dessler went on to become an Associate Professor of Atmospheric Sciences at Texas A&M University from 2005 to 2007 and has been a tenured Professor of Atmospheric Sciences there since 2007. [2]
He served as an editor for the American Geophysical Union Books Board from 1997 to 2002, and an associate editor for the Journal of Geophysical Research in 2002. [8]
Dessler also served as a Senior Policy Analyst in the White House Office of Science and Technology Policy for the last year of the Clinton administration. That experience was the basis for the book he co-authored, The Science and Politics of Global Climate Change: A Guide to the Debate . [7]
He also published a blog for Grist magazine from 2006 to 2009. [9] He later stated, "At first, I was enamoured with blogging, until I realized how repetitive it was to keep answering the same questions. I decided I wanted a more high-impact way to spend my time." [10] The New York Times said the results of his 2004 article in the Journal of Climate written with Ken Minschwaner placed them, "in the middle between the skeptics and those who argue that warming caused by burning of fossil fuels could be extremely severe." [11] The authors wrote a joint letter to the editor in response objecting to the impression given by the article that their "research goes against the consensus scientific view that global warming is a serious concern." They went on to state their work did not argue against the seriousness of the problem and that the potential effects were so serious "that slight overestimates of this warming make little difference -- just as reducing the size of a firing squad from 10 shooters to nine makes little difference to the person being executed." [12] A 2009 article in Science showed "warming from rising carbon dioxide should also lead to increased water vapor and additional warming, doubling the warming effect of the carbon dioxide." according to Kenneth Chang of The New York Times. [13]
Currently, Dessler is an editor of the Bulletin of the American Meteorological Society [14] and president-elect of the Global Environmental Change section of the American Geophysical Union. [15] He is also the Director of the Texas Center for Climate Studies [16] and holder of the Rita A. Haynes Chair in Geosciences at Texas A&M University. [17]
Dessler and Edward Parson co-authored, The Science and Politics of Global Climate Change: A Guide to the Debate in 2006 (2nd ed. 2009). It was described as, "a fascinating hybrid of science and policy directed at a broad or nonspecialist audience" by Wendy Gordon in a 2008 review in Eos . Gordon's review was positive concluding, "I could comfortably recommend this book to friend and colleagues." and that it would be "an excellent resource for a high school of college-level survey course in either environmental studies or public policy." [18] It also received a favorable review in the Bulletin of the American Meteorological Society by Paul Higgins. Higgins noted the book's, "careful reasoning and thoughtful presentation" and stated it was a sound guide to the climate change debate. [19] Concluding a generally positive review Randall Wigle writing in Canadian Public Policy stated, "...I believe it is a good candidate for a primer for multidisciplinary classes devoted to climate change policy, but it would have been an even better one with less advocacy of one side of the argument." [20] Maria Ivanova wrote in Global Environmental Politics that the book's scholarly value was indisputable. [21] Writing in New Scientist in 2006 Adrian Barnett said, "Free copies should be shipped to anyone who doubts the reality of climate change, starting with presidents in denial." [22] The book also received very positive reviews in Chromatographia , the Times Higher Education Supplement (THES) and Environmental Sciences. [23] [24] [25]
In 2012 Dessler wrote Introduction to Modern Climate Change "a textbook for non-science majors that uniquely immerses the reader in the science, impacts, economics, policies and political debate associated with climate change." [26] It received an award from the American Meteorological Society in 2014. [26] It was favorably reviewed by Cameron Reed in Physics & Society who said, "The writing is clear, has a nice balance of formal and informal prose, and includes occasional elements of dry humor to lighten discussions of otherwise very serious issues." [27] It is used in classes in environmental sciences and the science and policy of climate change. [28] [29] [30] [31]
...the climate is warming...humans are in the driver's seat...if nothing is done to rein in emissions, temperatures will likely increase enough to profoundly change the planet.
— Andrew Dessler
Dessler has been consulted by newspapers and has given talks on climate change and government policy. On January 16, 2014 he testified before the US Senate Committee on Environment and Public Works. [32] He stated that with almost 200 years of study by the scientific community of the climate system a robust understanding has emerged. He continued stating, the climate is warming and "humans are now in the driver's seat". He concluded, "We know that, over the next century, if nothing is done to rein in emissions, temperatures will likely increase enough to profoundly change the planet." [33] He gave a talk at the Goddard Space Flight Center in 2013 titled, "The Alternate Reality of Climate Skeptics" in which he explained how "climate skeptics have constructed an alternate reality to believe it [sic]. In this way, the debate over climate change turns into a debate over which reality should be believed." [34] In 2010 when US Senator James Inhofe attempted to block the US Environmental Protection Agency from regulating greenhouse gases under the Clean Air Act, Dessler told reporters he was confident that individual errors don't invalidate the scientific consensus that global temperature is rising stating, "That's not how science works." He asserted his confidence that the climate is warming due to human activity and that this will have "catastrophic impacts" stating, "The evidence includes a mountain of data." Dessler cited replication by multiple institutions as support. [35]
Dessler has suggested that scientists advocating for climate change mitigation should tell their personal stories and that this would reveal the strategy of ad hominem attacks by climate change deniers, an attempt to portray scientists to audiences as "not 'like them.'" He said by revealing their backstory scientists can build trust and show people that they share their values. [36] In December 2013 Dessler spoke at a workshop about his experiences with a request for all of his emails at Texas A&M from the American Tradition Institute's Chris Horner using the Texas Public Information Act. [37] [38] He had received support from Scott Mandia of the Climate Science Legal Defense Fund, the Public Employees for Environmental Responsibility and the Union of Concerned Scientists. [37]
When then presidential candidate Rick Perry suggested that scientists were frequently questioning "that manmade global warming is what is causing the climate to change." Dessler was interviewed by NPR to represent the mainstream scientific consensus. [39] With Perry's home state suffering a severe drought, Dessler (a native Texan) did not attribute the extreme weather that year (2011) to climate change, but he said, "We can be confident we’ve made this hellish summer worse than it would have been." [40]
A front page article in The New York Times examining the theory that clouds might offset the effects of increased greenhouse gasses found that his analysis in a 2011 article in Geophysical Research Letters "offered some evidence that clouds will exacerbate the long-term planetary warming" [41] [42] Following the publication of the New York Times article "Dessler became a target of climate science critics" and was interviewed on the PBS show Frontline for the episode "Climate of Doubt" which explored "the massive shift in public opinion on climate change." [37] [43] As a visiting fellow at the Cooperative Institute for Research in Environmental Sciences in 2013 and 2014 he is undertaking a project titled, "Understanding long-term variations in stratospheric water vapor." [44] In a November 2013 article in the Proceedings of the National Academy of Sciences of the United States of America Dessler and colleagues provide observational evidence of a positive feedback effect of stratospheric water vapor and global warming. [45] [46]
Dessler was described as an avid glider pilot in 2006. [7] He is married with two children and lives in College Station, Texas. [47]
—; Parson, Edward Anthony (2006). The Science and Politics of Global Climate Change: A Guide to the Debate (1st ed.). New York: Cambridge University Press. ISBN 9780521831703. (2009. 2nd ed. ISBN 9780521519243).
Cloud feedback is a type of climate change feedback that has been difficult to quantify in contemporary climate models. It can affect the magnitude of internally generated climate variability or they can affect the magnitude of climate change resulting from external radiative forcings. Cloud representations vary among global climate models, and small changes in cloud cover have a large impact on the climate.
The tropopause is the atmospheric boundary that demarcates the troposphere from the stratosphere, which are the lowest two of the five layers of the atmosphere of Earth. The tropopause is a thermodynamic gradient-stratification layer that marks the end of the troposphere, and is approximately 17 kilometres (11 mi) above the equatorial regions, and approximately 9 kilometres (5.6 mi) above the polar regions.
A sudden stratospheric warming (SSW) is an event in which polar stratospheric temperatures rise by several tens of kelvins over the course of a few days. The warming is preceded by a slowing then reversal of the westerly winds in the stratospheric polar vortex. SSWs occur about six times per decade in the northern hemisphere, and about once every 20-30 years in the southern hemisphere. Only two southern SSWs have been observed.
Richard Siegmund Lindzen is an American atmospheric physicist known for his work in the dynamics of the middle atmosphere, atmospheric tides, and ozone photochemistry. He is the author of more than 200 scientific papers. From 1972 to 1982, he served as the Gordon McKay Professor of Dynamic Meteorology at Harvard University. In 1983, he was appointed as the Alfred P. Sloan Professor of Meteorology at the Massachusetts Institute of Technology, where he would remain until his retirement in 2013. Lindzen has disputed the scientific consensus on climate change and criticizes what he has called "climate alarmism".
Global dimming is a decline in the amount of sunlight reaching the Earth's surface, a measure also known as global direct solar irradiance. It was observed soon after the first systematic measurements of solar irradiance began in the 1950s, and continued until 1980s, with an observed reduction of 4–5% per decade, even though solar activity did not vary more than the usual at the time. Instead, global dimming had been attributed to an increase in atmospheric particulate matter, predominantly sulfate aerosols, as the result of rapidly growing air pollution due to post-war industrialization. After 1980s, reductions in particulate emissions have also caused a "partial" reversal of the dimming trend, which has sometimes been described as a global brightening. This reversal is not yet complete, and it has also been globally uneven, as some of the brightening over the developed countries in the 1980s and 1990s had been counteracted by the increased dimming from the industrialization of the developing countries and the expansion of the global shipping industry, although they have also been making rapid progress in cleaning up air pollution in the recent years.
A circumpolar vortex, or simply polar vortex, is a large region of cold, rotating air; polar vortices encircle both of Earth's polar regions. Polar vortices also exist on other rotating, low-obliquity planetary bodies. The term polar vortex can be used to describe two distinct phenomena; the stratospheric polar vortex, and the tropospheric polar vortex. The stratospheric and tropospheric polar vortices both rotate in the direction of the Earth's spin, but they are distinct phenomena that have different sizes, structures, seasonal cycles, and impacts on weather.
John Adrian Pyle is a British atmospheric scientist, Director of the Centre for Atmospheric Science in Cambridge, England. He is a Professor in the Department of Chemistry at the University of Cambridge, and since 2007 has held the 1920 Chair of Physical Chemistry in the Chemistry Department. He is also a Fellow of the Royal Society and of St Catharine's College, Cambridge.
Polar amplification is the phenomenon that any change in the net radiation balance tends to produce a larger change in temperature near the poles than in the planetary average. This is commonly referred to as the ratio of polar warming to tropical warming. On a planet with an atmosphere that can restrict emission of longwave radiation to space, surface temperatures will be warmer than a simple planetary equilibrium temperature calculation would predict. Where the atmosphere or an extensive ocean is able to transport heat polewards, the poles will be warmer and equatorial regions cooler than their local net radiation balances would predict. The poles will experience the most cooling when the global-mean temperature is lower relative to a reference climate; alternatively, the poles will experience the greatest warming when the global-mean temperature is higher.
Marine cloud brightening also known as marine cloud seeding and marine cloud engineering is a proposed solar radiation management climate engineering technique that would make clouds brighter, reflecting a small fraction of incoming sunlight back into space in order to offset anthropogenic global warming. Along with stratospheric aerosol injection, it is one of the two solar radiation management methods that may most feasibly have a substantial climate impact. The intention is that increasing the Earth's albedo, in combination with greenhouse gas emissions reduction, carbon dioxide removal, and adaptation, would reduce climate change and its risks to people and the environment. If implemented, the cooling effect is expected to be felt rapidly and to be reversible on fairly short time scales. However, technical barriers remain to large-scale marine cloud brightening. There are also risks with such modification of complex climate systems.
Stratospheric aerosol injection is a proposed method of solar geoengineering to reduce global warming. This would introduce aerosols into the stratosphere to create a cooling effect via global dimming and increased albedo, which occurs naturally from volcanic winter. It appears that stratospheric aerosol injection, at a moderate intensity, could counter most changes to temperature and precipitation, take effect rapidly, have low direct implementation costs, and be reversible in its direct climatic effects. The Intergovernmental Panel on Climate Change concludes that it "is the most-researched [solar geoengineering] method, with high agreement that it could limit warming to below 1.5 °C (2.7 °F)." However, like other solar geoengineering approaches, stratospheric aerosol injection would do so imperfectly and other effects are possible, particularly if used in a suboptimal manner.
Atmospheric methane is the methane present in Earth's atmosphere. The concentration of atmospheric methane is increasing due to methane emissions, and is causing climate change. Methane is one of the most potent greenhouse gases. Methane's radiative forcing (RF) of climate is direct, and it is the second largest contributor to human-caused climate forcing in the historical period. Methane is a major source of water vapour in the stratosphere through oxidation; and water vapour adds about 15% to methane's radiative forcing effect. The global warming potential (GWP) for methane is about 84 in terms of its impact over a 20-year timeframe. and 28 in terms of its impact over a 100-year timeframe. The global temperature potential for methane is about 4 in terms of its impact over a 100-year timeframe.
Climate change feedbacks are effects of global warming that amplify or diminish the effect of forces that initially cause the warming. Positive feedbacks enhance global warming while negative feedbacks weaken it. Feedbacks are important in the understanding of climate change because they play an important part in determining the sensitivity of the climate to warming forces. Climate forcings and feedbacks together determine how much and how fast the climate changes. Large positive feedbacks can lead to tipping points—abrupt or irreversible changes in the climate system—depending upon the rate and magnitude of the climate change.
An atmospheric river (AR) is a narrow corridor or filament of concentrated moisture in the atmosphere. Other names for this phenomenon are tropical plume, tropical connection, moisture plume, water vapor surge, and cloud band.
Costas Varotsos is a Greek physicist known from his contribution to the global climate-dynamics research and remote sensing.
Adam A. Scaife is a British physicist and head of long range prediction at the Met Office. He is also a professor at Exeter University. Scaife carries out research into long range weather forecasting and computer modelling of the climate and has published over 250 peer reviewed studies on atmospheric dynamics, computer modelling and climate as well as popular science and academic books on meteorology.
Cirrus cloud thinning (CCT) is a proposed form of climate engineering. Cirrus clouds are high cold ice that, like other clouds, both reflect sunlight and absorb warming infrared radiation. However, they differ from other types of clouds in that, on average, infrared absorption outweighs sunlight reflection, resulting in a net warming effect on the climate. Therefore, thinning or removing these clouds would reduce their heat trapping capacity, resulting in a cooling effect on Earth's climate. This could be a potential tool to reduce anthropogenic global warming. Cirrus cloud thinning is an alternative category of climate engineering, in addition to solar radiation management and greenhouse gas removal.
Arlene M. Fiore is an atmospheric chemist whose research focuses on issues surrounding air quality and climate change.
Tiffany Shaw is a geophysical scientist from Canada. She is currently an associate professor at the University of Chicago. She is known for her extensive contributions to the geophysical and atmospheric sciences.
Beate Gertrud Liepert is a research scientist at Columbia University, as well as in North West Research Associates, Redmond and a lecturer at Seattle University. Her research focuses on climate variability: inter-annual changes, centennial time scales, the water and energy cycles.
Anne Ritger Douglass is atmospheric physicist known for her research on chlorinated compounds and the ozone layer.