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Gravity-wave-perturbed wind shears derived from SABER temperature observations
Large wind shears around the mesopause region play an important role in atmospheric neutral dynamics and ionospheric electrodynamics. Based on previous observations using...- publication PDF
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Momentum balance and gravity wave forcing in the mesosphere and lower thermosphere
Gravity wave forcing (GWF), which is the primary driver of the mesospheric and lower thermospheric (MLT) circulation, is difficult to measure directly. In this work, the zonal...- publication PDF
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An instrument to measure coronal emission line polarization
We have constructed an instrument to measure the polarization of light emitted by the solar corona in order to constrain the strength and orientation of coronal magnetic fields....- publication PDF
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The Community Earth System Model (CESM) large ensemble project: A community...
While internal climate variability is known to affect climate projections, its influence is often underappreciated and confused with model error. Why? In general, modeling...- publication PDF
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Characterization of trace gases measured over Alberta oil sands mining...
Oil sands comprise 30% of the world's oil reserves and the crude oil reserves in Canada's oil sands deposits are second only to Saudi Arabia. The extraction and processing of...- publication PDF
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Critical load exceedances for North America and Europe using an ensemble of...
Exceedances of critical loads for deposition of sulfur (S) and nitrogen (N) in different ecosystems were estimated using European and North American ensembles of air quality...- publication PDF
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Evolution of a foreshock bubble in the midtail foreshock and impact on the...
Foreshock transients have been observed in the midtail foreshock. How a foreshock transient evolves in nightside foreshock and how it may impact the midtail bow shock,...- publication PDF
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In-situ chemical characterization of aged biomass burning aerosols impacting...
During the Ice in Clouds ExperimentâLayer Clouds (ICE-L), aged biomass-burning particles were identified within two orographic wave cloud regions over Wyoming using single-...- publication PDF
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Microphysical simulations of large volcanic eruptions: Pinatubo and Toba
Simulations of stratospheric clouds from eruptions ranging in size from the 1991 eruption of Mount Pinatubo to that of Toba 74,000âyears ago have been completed using a 3D...- publication PDF
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Decadal variability of Southeast US rainfall in an eddying global coupled model
Ocean variability is a dominant source of remote rainfall predictability, but in many cases the physical mechanisms driving this predictability are not fully understood. This...- publication PDF
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Solar irradiance nowcasting case studies near Sacramento
The Sun4Cast solar power forecasting system, designed to predict solar irradiance and power generation at solar farms, is composed of several component models operating on both...- publication PDF
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Neutral winds from mesosphere to thermosphere -- past, present, and future outlook
The Earth's upper atmosphere (85-550 km) is the nearest region of geospace and is highly dynamic in nature. Neutral winds impact a large portion of the dynamics in this region....- publication PDF
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Adaptively implicit advection for atmospheric flows
Implicit time‐stepping for advection is applied locally in space and time where Courant numbers are large, but standard explicit time‐stepping is used for the...- publication PDF
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Testing methods for reconstructing glacial Antarctic circumpolar current...
The Antarctic Circumpolar Current (ACC) plays a vital role in the interbasin exchange of ocean properties. A robust method to reconstruct the ACC baroclinic transport is helpful...- publication PDF
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Data assimilation: A fully nonlinear approach to ensemble formation using...
Operational forecasting with simulation models involves the melding of observations and model dynamics to determine a set of initial conditions for each forecast. The Kalman...- publication PDF
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Ecosystem function in complex mountain terrain: Combining models and...
Abiotic factors structure plant community composition and ecosystem function across many different spatial scales. Often, such variation is considered at regional or global...- publication PDF
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Recent divergences in stratospheric water vapor measurements by frost point...
Balloon-borne frost point hygrometers (FPs) and the Aura Microwave Limb Sounder (MLS) provide high-quality vertical profile measurements of water vapor in the upper troposphere...- publication PDF
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Impact of loss of U.S. microwave and radio occultation observations in...
As the U.S. polar-orbiting satellites NOAA-15, -18, and -19 and NASA's Aqua satellite reach the ends of their lives, there may be a loss in redundancy between their microwave...- publication PDF
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Technical Note: Comparison of ensemble Kalman filter and variational...
Data assimilation (DA) approaches, including variational and the ensemble Kalman filter methods, provide a computationally efficient framework for solving the COâ source-sink...- publication PDF
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On the dynamics of the East African Jet. II: Jet transients
A barotropic, primitive equation model on an equatorial beta plane is used to investigate the transient behavior of the East African jet. Both analytic and numerical solutions...- publication PDF
