A5078040645- Geology and Paleoclimatology Research
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Isotope Analysis in Ecology
- Methane Hydrates and Related Phenomena
- Groundwater and Isotope Geochemistry
- Atmospheric and Environmental Gas Dynamics
- Astrophysics and Star Formation Studies
- Climate variability and models
- Pacific and Southeast Asian Studies
- Planetary Science and Exploration
- Geomagnetism and Paleomagnetism Studies
- Archaeology and ancient environmental studies
- Atmospheric chemistry and aerosols
- Science and Climate Studies
- Geological and Geophysical Studies
- Nuclear Physics and Applications
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Cryospheric studies and observations
- Advanced Computational Techniques and Applications
- Oceanographic and Atmospheric Processes
- Nuclear reactor physics and engineering
- Radiative Heat Transfer Studies
- Geophysics and Gravity Measurements
Goddard Institute for Space Studies
2019-2021
University at Albany, State University of New York
2011-2016
Albany State University
2011-2016
University of Wisconsin–Madison
2010-2011
Abstract. Volcanic aerosols exert the most important natural radiative forcing of last millennium. State-of-the-art paleoclimate simulations this interval are typically forced with diverse spatial patterns volcanic forcing, leading to different responses in tropical hydroclimate. Recently, theoretical considerations relating intertropical convergence zone (ITCZ) position demands global energy balance have emerged literature, allowing for a connection be made between and recent developments...
Abstract. Currently, little is known on how volcanic eruptions impact large-scale climate phenomena such as South American paleo-Intertropical Convergence Zone (ITCZ) position and summer monsoon behavior. In this paper, an analysis of observations model simulations employed to assess the influence large tropical America. This problem first considered for historically recent episodes which more are available but where fewer events exist confounding effects El Niño–Southern Oscillation (ENSO)...
Abstract Obliquity can shape the habitability of a planet by changing seasonal availability incident solar radiation. Changes in radiation lead to changes light, temperature, ocean circulation, stratification, and corresponding nutrient availability, all which are important determining net primary productivity (NPP). Moreover, fraction carbon assimilated phytoplankton is sequestered deep ocean. Therefore, alter distribution CO 2 between atmosphere. In this study, we investigate effects...
Abstract Earth-like planets in the circumstellar habitable zone (HZ) may have dramatically different climate outcomes depending on their spin–orbit parameters, altering habitability for life as we know it. We present a suite of 93 ROCKE-3D general circulation models (GCMs) with same surface conditions and average annual insolation Earth, but wide range rotation periods, obliquities, orbital eccentricities, longitudes periastra. Our metric f HZ is calculated based temperature precipitation...
Abstract. We present the second generation of ROCKE-3D (Resolving Orbital and Climate Keys Earth Extraterrestrial Environments with Dynamics), a generalized 3-dimensional General Circulation Model (GCM) for use in Solar System exoplanetary simulations rocky planet climates. version 2.0 is descendant ModelE2.1, flagship NASA Goddard Institute Space Studies (GISS) used most recent Intergovernmental Panel Change (IPCC) assessments. continuous effort to expand capabilities GISS ModelE handle...
How does climate sensitivity vary with the magnitude of forcing? This question was investigated use a modified coupled atmosphere‐ocean model, whose stability improved so that model would accommodate large radiative forcings yet be fast enough to reach rapid equilibrium. Experiments were performed in which atmospheric CO 2 multiplied by powers 2, from 1/64 256 times 1950 value. From 8 32 times, , for doubling reaches 8°C due increases water vapor absorption and cloud top height reductions...
The potential habitability of known exoplanets is often categorized by a nominal equilibrium temperature assuming Bond albedo either 0.3, similar to Earth, or 0. As an indicator habitability, this leaves much be desired, because on other planets can very different, and surface exceeds due the atmospheric greenhouse effect. We use ensemble 3-dimensional general circulation model simulations show that for range habitable planets, variability albedo, temperature, even predicted with useful...
Abstract NISTAR, aboard the DSCOVR spacecraft, is one of National Aeronautics and Space Administration's energy budget instruments designed to measure seasonal changes in Earth's total outgoing radiation from a unique vantage point at Lagrangian L‐1 million miles Earth. Global balance measurements are important constraints for climate models, but difficult quantify. CERES data offer best current observational constraints, need extensive modeling get global energy. NISTAR observes entire...
Abstract High obliquity planets represent potentially extreme limits of terrestrial climate, as they exhibit large seasonality, a reversed annual-mean pole-to-equator gradient stellar heating, and novel cryospheres. A suite 3D global climate model simulations is performed for low high with various fluxes, CO 2 concentrations, initial conditions to explore the propensity climates undergo glaciation. We also simulate thick or H atmospheres, such those expected develop near beyond outer edge...
Abstract Much attention has been given to the climate dynamics and habitable boundaries of synchronously rotating planets around low mass stars. However, other rotational states are possible, including spin–orbit resonant configurations, particularly when higher eccentricity orbits can be maintained in a system. Additionally, oscillating strain as planet moves from periastron apoastron results friction tidal heating, which an important energy source. Here, we simulate ocean-covered near...
In this journal, Gerhard Gerlich and Ralf D. Tscheuschner claim to have falsified the existence of an atmospheric greenhouse effect. 1 Here, we show that their methods, logic, conclusions are in error. Their most significant errors include trying apply Clausius statement Second Law Thermodynamics only one side a heat transfer process rather than entire process, systematically ignoring non-radiative flows applicable Earth's surface atmosphere. They radiative from colder atmosphere warmer is...
Abstract. Currently, little is known on how volcanic eruptions impact large-scale climate phenomena such as paleo-ITCZ position or South American summer monsoon behavior. In this paper, an analysis of observations and model simulations employed to assess the influence large America. This problem considered both for historically recent episodes, which more comprehensive global exist, well reconstructed events period 850 C.E. present that are incorporated into NASA GISS ModelE2-R simulation...
Abstract. In a transient simulation of the last deglaciation with fully coupled model (TraCE-21000), an overshoot Atlantic Meridional Overturning Circulation (AMOC) is simulated and proposed as key factor for onset Bølling-Allerød (BA) warming event. There collaborating evidence AMOC at BA in various proxy reconstructions although mechanism governing its behavior not well understood. Here, we present two new sensitivity experiments to explicitly illustrate impact North – GIN Sea exchange on...
Abstract. Volcanic aerosols exert the most important natural radiative forcing of last millennium. State-of-the-art paleoclimate simulations this interval are typically forced with diverse spatial patterns volcanic forcing, leading to different responses in tropical hydroclimate. Recently, theoretical considerations relating intertropical convergence zone (ITCZ) position demands global energy balance have emerged literature, allowing for a connection be made between and recent developments...
Earth-like planets in the circumstellar habitable zone (HZ) may have dramatically different climate outcomes depending on their spin-orbit parameters, altering habitability for life as we know it. We present a suite of 93 ROCKE-3D general circulation models (GCMs) with same surface conditions and average annual insolation Earth, but wide range rotation periods, obliquities, orbital eccentricities, longitudes periastra. Our metric $f_\mathrm{HZ}$ is calculated based temperature precipitation...