About

Adrian Lenardic is a Professor in the Department of Earth, Environmental and Planetary Sciences at Rice University. He holds a Ph.D. from the University of California, Los Angeles, earned in 1995. His research areas include geodynamics, geophysics, and planetary sciences. Throughout his career, he has received several honors and awards, including the Agassiz Visiting Lecturer position at Harvard University in 2010, the Phi Beta Kappa Teaching Prize for Most Effective Teacher Among Assistant Professors at Rice University in 2005, and the National Science Foundation Faculty Early Career Development Award in 2005. Additionally, he has been recognized for his extracurricular achievements, such as winning the Jamail Park Most Improved Skateboarder award in 2015 and the City of Houston Annual Art Car Parade First Prize in the musical category in 2004 and 2005. He is based at Rice University, where he is actively engaged in research and teaching in his specialized fields.

Research topics

• Paleontology
• Geology
• Geophysics
• Oceanography
• Climatology
• Earth science

Selected publications

• Generation and preservation of Archean lithosphere and crust

  Elsevier eBooks · 2025-12-05

  book-chapter
  PublisherDOI

• Observational Tests of Terrestrial Planet Buffering Feedbacks and the Habitable Zone Concept

  ArXiv.org · 2025-09-02

  preprintOpen access

  The habitable zone is defined as the orbital region around a star where planetary feedback cycles buffer atmospheric greenhouse gases that, in combination with solar luminosity, maintain surface temperatures suitable for liquid water. Evidence supports the existence of buffering feedbacks on Earth, but whether these same feedbacks are active on other Earth-like planets remains untested, as does the habitable zone hypothesis. While feedbacks are central to the habitable zone concept, one does not guarantee the other-i.e., it is possible that a planet may maintain stable surface conditions at a given solar luminosity without following the predicted $CO_2$ trend across the entire habitable zone. Forthcoming exoplanet observations will provide an opportunity to test both ideas. In anticipation of this and to avoid premature conclusions based on insufficient data, we develop statistical tests to determine how many observations are needed to detect and quantify planetary-scale feedbacks. Our model-agnostic approach assumes only the most generic prediction that holds for any buffering feedback, allowing the observations to constrain feedback behavior. That can then inform next-level questions about what specific physical, chemical, and/or biological feedback processes may be consistent with observational data. We find that [23, 74](95% CI) observations are required to detect feedback behavior within a given solar luminosity range, depending on the sampling order of planets. These results are from tests using conservative error tolerance-a measure used to capture the risk of false positives. Reducing error tolerance lowers the chance of false positives but requires more observations; increasing it reduces the required sample size but raises uncertainty in estimating population characteristics. We discuss these trade-offs and their implications for testing the habitable zone hypothesis.

  PublisherOA PDFDOI

• Boundary layer interactions in mantle convection: Peaks, limits and effects on convective scaling relations

  Physics of The Earth and Planetary Interiors · 2025-12-12

  article
  PublisherDOI

• Infinite Prandtl number, mixed-heated convection in a spherical domain: velocity and heat flux scaling trends

  Geophysical Journal International · 2025-01-30 · 1 citations

  articleOpen access

  SUMMARY Numerical simulations of infinite Prandtl number convection in Cartesian domains have shown that a combination of internal and basal heating allows for behaviour not observed in either end-member cases of pure basal or pure internal heating. In particular, these mixed heating systems exhibit a decrease in the upper boundary layer velocity as internal heating increases. This leads to an inverse relationship between surface heat flow and boundary layer velocity. The inverse relationship has been attributed to boundary layer interactions, leading to deviations from classic boundary layer theory. Herein, we extend that work by presenting results from numerical experiments for mixed-heated convection in an isoviscous fluid in a fully 3-D spherical domain. We show that an increase in internal heating causes a decrease in surface velocity, consistent with previous Cartesian results. We confirm that boundary layer interactions decrease with increased internal heating, which correlates with decreasing surface velocities. A scaling theory, previously applied to Cartesian geometry, is modified for spherical geometries and tested against the results of the numerical solutions. The modified scalings lead to good fits for temperature and heat flux trends. The scalings predict that velocities can decrease with increased internal heating from low to moderate internal heating rates and become constant at higher heating rates, consistent with numerical results. The quantitative match between velocity scalings and numerical results is not as good as observed for heat flow and temperature trends. We attribute this to surface velocities being more strongly affected by observed changes in convective wavelengths and planform transitions from sheet-like to plume-like downwellings as the rate of internal heating and/or basal heating increases.

  PublisherOA PDFDOI

• Extreme Supercontinental Climate Control: Punctuated Mantle Thermal Mixing and a Sustained Snowball Earth?

  Geophysical monograph · 2025-11-04

  otherSenior author

  The intermittent assembly and fragmentation of insulating supercontinents can modify the lateral extent of plate-scale convective thermal mixing. During the assembly and fragmentation of supercontinent Rodinia, consequent shifts in the balance of volcanic sources and weathering sinks for atmospheric CO 2 through a transient disruption of the exchange and mixing of insulated subcontinental and strongly cooled suboceanic mantle material potentially enabled nearly 100 million years of intense cooling and a snowball Earth climate in the Neoproterozoic. We discuss two largely unexplored underlying geodynamic drivers for this climate change. The first is an optimized mid-ocean ridge fault and fracture-controlled weathering sink for p CO 2 that acts as a “ p CO 2 -stat ” rather than a conventional “thermostat.” Second, enhanced continental crustal warming during assembly leads to intensified continental arc magmatism, crustal magma storage, and a proclivity for explosive caldera-forming eruptions during supercontinental breakup. Ash delivery and related surface meltwater production and drainage to the underlying surface ocean can reduce the resilience of the global glaciation during supercontinental breakup. Overall, we demonstrate potential powerful connections among tectonic fluctuations, climate evolution, and the long-term tectonic buffering of climate change. We apply this message to ongoing vigorous discussions of the tectonically modulated dynamics of habitability that drive the search for Earth-sized habitable worlds.

  PublisherDOI

• Absurdities, Ironies, Hyper-Production and Artificial Bogeymen

  2024-08-01

  preprintOpen access1st authorCorresponding

  This piece is an expanded version of a short letter to the editor about an article that appeared in Nature. The Nature article was titled "Is ChatGPT making scientists hyper-productive?" The original letter to the editor pointed out that the article made a temporal freeze frame error and was presented in a mode of disingenuous questioning that would hamper community wide self-examination into the issue of science production. The editors passed - no hard feelings. This piece expanded the letter to address issues related to what has come to be termed 'publication overload' (also called 'publication strain' in some studies).

  PublisherOA PDFDOI

• What’s Wrong with Deep Time Geology?

  2024-01-01

  articleOpen accessSenior author
  PublisherOA PDFDOI

• Mastodon over Mammon - Towards publicly owned scholarly knowledge

  Zenodo (CERN European Organization for Nuclear Research) · 2023-02-18

  articleOpen access

  Twitter is in turmoil and the scholarly community on the platform is once again starting to migrate. As with the early internet, scholarly organizations are at the forefront of developing and implementing a decentralized alternative to Twitter, Mastodon. Both historically and conceptually, this is not a new situation for the scholarly community. Historically, scholars were forced to leave social media platform FriendFeed after it was bought by Facebook in 2006. Conceptually, the problems associated with public scholarly discourse subjected to the whims of corporate owners are not unlike those of scholarly journals owned by monopolistic corporations: in both cases the perils associated with a public good in private hands are palpable. For both short form (Twitter/Mastodon) and longer form (journals) scholarly discourse, decentralized solutions exist, some of which are already enjoying some institutional support. Here we argue that scholarly organizations, in particular learned societies, are now facing a golden opportunity to rethink their hesitations towards such alternatives and support the migration of the scholarly community from Twitter to Mastodon by hosting Mastodon instances. Demonstrating that the scholarly community is capable of creating a truly public square for scholarly discourse, impervious to private takeover, might renew confidence and inspire the community to focus on analogous solutions for the remaining scholarly record – encompassing text, data and code – to safeguard all publicly owned scholarly knowledge.

  PublisherDOI

• Innovation at University.Inc

  Zenodo (CERN European Organization for Nuclear Research) · 2023-09-04

  articleOpen access1st authorCorresponding

  "<em>It’s one of the most absurd ironies of our neoliberal age. Having looted the public realm over the last half century in the name of the free-market, we are suddenly discovering that the last refuge of public virtue is—yes, you guessed it—the private company." It may not be ironic, but it is creepy to have all problems humanity may face packaged as opportunities for entrepreneurship (all the creepier to have Universities of higher education subscribe to this view). </em>

  PublisherDOI

• Mastodon over Mammon - Towards publicly owned scholarly knowledge

  Apollo (University of Cambridge) · 2023-01-01

  articleOpen access

  Twitter is in turmoil and the scholarly community on the platform is once again starting to migrate. As with the early internet, scholarly organizations are at the forefront of developing and implementing a decentralized alternative to Twitter, Mastodon. Both historically and conceptually, this is not a new situation for the scholarly community. Historically, scholars were forced to leave social media platform FriendFeed after it was bought by Facebook in 2006. Conceptually, the problems associated with public scholarly discourse subjected to the whims of corporate owners are not unlike those of scholarly journals owned by monopolistic corporations: in both cases the perils associated with a public good in private hands are palpable. For both short form (Twitter/Mastodon) and longer form (journals) scholarly discourse, decentralized solutions exist, some of which are already enjoying some institutional support. Here we argue that scholarly organizations, in particular learned societies, are now facing a golden opportunity to rethink their hesitations towards such alternatives and support the migration of the scholarly community from Twitter to Mastodon by hosting Mastodon instances. Demonstrating that the scholarly community is capable of creating a truly public square for scholarly discourse, impervious to private takeover, might renew confidence and inspire the community to focus on analogous solutions for the remaining scholarly record—encompassing text, data and code—to safeguard all publicly owned scholarly knowledge.

  PublisherOA PDFDOI

Recent grants

• The Thermo-Chemical State and Thermo-Tectonic Evolution of Cratons and Deep Cratonic Lithosphere

  NSF · $165k · 2000–2004

• Collaborative Research: The Asthenosphere and Mantle Dynamics

  NSF · $338k · 2010–2014

• Collaborative Research: The Asthenosphere and Mantle Dynamics

  NSF · $88k · 2016–2017

• CAREER Development in Geomodeling: Seeing and Creating Connections in Earth Science

  NSF · $692k · 2005–2011

Frequent coauthors

• Louis Moresi

  61 shared

• M. Jellinek

  University of British Columbia

  45 shared

• Johnny Seales

  38 shared

• Craig O’Neill

  Queensland University of Technology

  29 shared

• C. M. Cooper

  Washington State University

  22 shared

• M. B. Weller

  Lunar and Planetary Institute

  20 shared

• W. M. Kaula

  University of California, Los Angeles

  20 shared

• W. B. Moore

  Hampton University

  18 shared

Awards & honors

• Agassiz Visiting Lecturer, Harvard University (2010)
• Phi Beta Kappa Teaching Prize for Most Effective Teacher Amo…
• National Science Foundation Faculty Early Career Development…
• City of Houston Annual Art Car Parade First Prize, Musical C…