Atmospheric System Research

Recent Content

Recent Highlights

Lawrence Livermore National Laboratory scientists together with scientists from Colorado State University and State University of New York – Albany analyzed multiple ground-based retrievals of cloud properties to quantify how low cloud reflectivity responds to changes in temperature. They also...
Atmospheric secondary organic aerosols (SOA) particles affect air quality, visibility, human health, clouds, and radiation. Unseen by the naked eye, large quantities of carbon-containing vapors enter the atmosphere as they escape from trees, fossil-fuel burning, and forest fires. The atmosphere...
In the tropics, the upper troposphere is cloudier, on average, than either the middle or lower troposphere. The conventional paradigm for these clouds attributes their existence to the rapidly-declining convective mass flux below the tropopause, which implies a large source of detraining cloudy air...
We developed a process-based El Niño-Southern Oscillation (ENSO) index that, for the first time, accounts for the nonlinear relationship between sea surface temperature and deep convection by tracking the average longitude of tropical Pacific deep convection. 
Methane also heats the climate system by absorbing sunlight, and the absorption is maximized over bright clouds and deserts.  

Publications

Ground‐based observations from three middle‐ and high‐latitude sites managed by the U.S. Department of Energy's Atmospheric Radiation Measurement (ARM) program are used to determine the sensitivity of the low‐cloud optical depth to temperature and to test whether observations support mechanisms...
We developed a parametrizable box model to empirically derive the yields of semivolatile products from VOC oxidation using chamber measurements, while explicitly accounting for the multigenerational chemical aging processes (such as the gas-phase fragmentation and functionalization and aerosol-...
Tropical anvil clouds play a large role in Earth’s radiation balance, but their effect on global warming is uncertain. The conventional paradigm for these clouds attributes their existence to the rapidly-declining convective mass flux below the tropopause, which implies a large source of detraining...
We show that the well‐known failure of any single index to capture the diversity and extremes of El Niño‐Southern Oscillation (ENSO) results from the inability of existing indices to uniquely characterize the average longitude of deep convection in the Walker Circulation. We present a simple sea...
Recently, it was recognized that widely used calculations of methane radiative forcing systematically underestimated its global value by 15% by omitting its shortwave effects. We show that shortwave forcing by methane can be accurately calculated despite considerable uncertainty and large gaps in...

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