A5047088628- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Geomagnetism and Paleomagnetism Studies
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Climate variability and models
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Solar and Space Plasma Dynamics
- Isotope Analysis in Ecology
- Meteorological Phenomena and Simulations
- Atmospheric chemistry and aerosols
- Astrophysics and Star Formation Studies
- Biofuel production and bioconversion
- Space Science and Extraterrestrial Life
- Water Quality Monitoring and Analysis
- Cooperative Communication and Network Coding
- Energy and Environment Impacts
- Bioenergy crop production and management
- Oceanographic and Atmospheric Processes
- Air Quality Monitoring and Forecasting
- Atmospheric aerosols and clouds
- Tropical and Extratropical Cyclones Research
- Space Satellite Systems and Control
University of Houston
2016-2025
Potsdam Institute for Climate Impact Research
2011-2024
Chinese Research Academy of Environmental Sciences
2022-2024
Northwestern University
2024
Peking University
2002-2024
National Oceanic and Atmospheric Administration
2024
Signal Processing (United States)
2021
Cloud Computing Center
2021
University of Bern
2021
University of Warwick
2021
Biomass from cellulosic bioenergy crops is expected to play a substantial role in future energy systems, especially if climate policy aims at stabilizing greenhouse gas concentration low levels. However, the potential of for change mitigation remains unclear due large uncertainties about agricultural yield improvements and land availability biomass plantations.
The radiant energy budget and internal heat are fundamental properties of giant planets, but precise determination these remains a challenge. Here, we report measurements Jupiter's based on Cassini multi-instrument observations. Our findings reveal that Bond albedo heat, 0.503 ± 0.012 7.485 0.160 W m-2 respectively, significantly larger than 0.343 0.032 5.444 0.425 Wm-2, the previous best estimates. new results help constrain improve current evolutionary theories models for Jupiter....
The mean state of the global atmospheric energy cycle is re‐examined using two reanalysis datasets — NCEP2 and ERA40 (1979–2001). general consistency between suggests that present estimates are probably most reliable ones. comparison a previous study shows noticeable discrepancies in some components conversion rates. current estimate transformations from potential to kinetic C ( P M , K ) further near‐surface processes play an important role rate ), along with Ferrel cell Hadley cells, which...
The Imaging Science Subsystem onboard the Cassini spacecraft recorded numerous high-quality images of Jupiter and Saturn at various wavelengths, from ultraviolet to near-infrared, during its 20-year mission 1997 2017. Using these images, we have developed global maps across multiple wavelengths. These reveal atmospheric structures Saturn, offering a comprehensive tool study physical dynamic processes systems on scale. Additionally, multi-wavelength maps, which probe different pressure levels...
Abstract The strong zonal winds on giant planets are among the most interesting phenomena in our solar system. Observations recorded by Composite Infrared Spectrometer (CIRS), Imaging Science Subsystem (ISS), and Visual Mapping (VIMS) Cassini spacecraft utilized to investigate spatiotemporal variations Saturn's winds. A general thermal wind equation works for investigating vertical structure of at all latitudes, but it has integration gaps near equator caused cylindrical path. Here, we...
Juno’s microwave radiometer has revolutionized our understanding of Jupiter’s atmosphere. By utilizing six channels (0.6 GHz ~ 22 GHz), Juno scanned atmosphere from pole to pole, providing near-global, three-dimensional coverage. While the primary goal was measure water abundance beneath cloud layer, data have revealed far more, raising new questions. Notably, shows that weather layer is not generally adiabatic, challenging prior assumptions convection would homogenize...
Abstract The Lorenz energy cycle is widely used to investigate atmospheres and climates on planets. However, the long-term temporal variations of such an have not yet been explored. Here we use three independent meteorological data sets from modern satellite era, examine characteristics Earth’s global atmosphere in response climate change. total mechanical basically remains constant with time, but global-average eddy energies show significant positive trends. spatial investigations suggest...
Abstract The latitude‐altitude map of ammonia mixing ratio shows an ammonia‐rich zone at 0–5°N, with ratios 320–340 ppm, extending from 40–60 bars up to the cloud base 0.7 bars. Ammonia‐poor air occupies a belt 5–20°N. We argue that downdrafts as well updrafts are needed in 0–5°N balance upward flux. Outside 0–20°N region, belt‐zone signature is weaker. At latitudes out ±40°, there layer down 2 we caused by falling precipitation. Below, ammonia‐poor minimum 6 Unanswered questions include how...
Long‐term (2004–2009) on‐orbit observations by Cassini Composite Infrared Spectrometer are analyzed to precisely measure Saturn's emitted power and its meridional distribution. Our evaluations suggest that the average global is 4.952 ± 0.035 W m −2 during period of 2004–2009. The corresponding effective temperature 96.67 0.17 K. 16.6% higher in Southern Hemisphere than Northern Hemisphere. From 2005 2009, mean decreased ∼2% ∼0.5%, respectively. study further reveals interannual variability...
Juno Microwave Radiometer (MWR) observations of Jupiter's mid-latitudes reveal a strong correlation between brightness temperature contrasts and zonal winds, confirming that the banded structure extends throughout troposphere. However, microwave gradient is observed to change sign with depth: belts are microwave-bright in $p<5$ bar range microwave-dark $p>10$ range. The transition level (which we call jovicline) evident MWR 11.5 cm channel, which samples 5-14 when using limb-darkening at all...
Jupiter's atmosphere is dominated by multiple jet streams which are strongly tied to its 3D atmospheric circulation. Lacking a rigid bottom boundary, several models exist for how the meridional circulation extends into planetary interior. Here we show, collecting evidence from instruments of Juno mission, existence mid-latitudinal cells driven turbulence, similar Ferrel on Earth. Different than Earth, contains only one such cell in each hemisphere, larger, faster rotating Jupiter can...
The global energy budget is pivotal to understanding planetary evolution and climate behaviors. Assessing the of giant planets, particularly those with large seasonal cycles, however, remains a challenge without long-term observations. Evolution models Saturn cannot explain its estimated Bond albedo internal heat flux, mainly because previous estimates were based on limited Here, we analyze observations recorded by Cassini spacecraft find notably higher (0.41 ± 0.02) flux (2.84 0.20 Wm
Abstract Saturn has an intense and broad eastward equatorial jet with a complex three-dimensional structure mixed time variability. The region experiences strong seasonal insolation variations enhanced by ring shadowing, three of the six known giant planetary-scale storms have developed in it. These factors make Saturn’s equator natural laboratory to test models jets planets. Here we report on bright atmospheric feature imaged 2015 that moved steadily at high speed 450 ms −1 not measured...
TCP-AQM protocol can be interpreted as distributed primal-dual algorithms over the Internet to maximize aggregate utility. In this paper, we study whether together with shortest-path routing utility appropriate choice of link cost, on a slower timescale, both source rates and routes. We show that is generally impossible because addition route maximization makes problem NP-hard. exhibit an inevitable tradeoff between instability maximization. For special case ring network, prove rigorously...
Multifilter images of Jupiter acquired by the Cassini Imaging Science Subsystem (ISS) are used to derive zonal winds at altitudes above and below visible cloud deck. Small features unique ultraviolet ISS tracked get systematic high‐altitude winds. Comparison between from vertical profile Composite Infrared Spectrometer (CIRS) shows that a pressure level is ∼0.2 scale heights higher than continuum‐band images. Deeper different latitudes equatorial region measured tracking observed within hot...
The global energy budget of planets and their moons is a critical factor to influence the climate change on these objects.Here we report first measurement emitted power Titan.Long-term (2004Long-term ( -2010) ) observations conducted by Composite Infrared Spectrometer (CIRS) onboard Cassini reveal that total Titan (2.84 AE 0.01) Â 10 14 watts.Together with previous measurements absorbed solar Titan, CIRS indicate in equilibrium within error.The uncertainty places an upper limit imbalance 6.0%.