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Matrix approach to accelerate spin-up of CLM5
Numerical models have been developed to investigate and understand responses of biogeochemical cycle to global changes. Steady state, when a system is in dynamic equilibrium, is...- publication PDF
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On optimal stability test spacing for assessing snow avalanche conditions
Assessing snow stability requires a holistic approach, relying on avalanche, snowpack and weather observations. Part of this assessment utilizes stability tests, but these tests...- publication PDF
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Development of an intense, warm-core mesoscale vortex associated with the 8...
In this study, the dynamical processes contributing to warm-core meso-β-scale vortex formation associated with the 8 May 2009 "super derecho" are examined utilizing two...- publication PDF
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Transition and equilibration of neutral atmospheric boundary layer flow in...
The Weather Research and Forecasting Model permits finescale large-eddy simulations (LES) to be nested within coarser simulations, an approach that can generate more accurate...- publication PDF
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A one-step-ahead ensemble Kalman smoothing approach toward estimating the...
In this study, a one-step-ahead ensemble Kalman smoother (EnKS) is introduced for the purposes of parameter estimation. The potential for this system to provide new constraints...- publication PDF
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Modeling of multiple effects of atmospheric tides on the ionosphere: An...
A number of recent studies have highlighted the observational evidence for a coupling between atmospheric tides in the thermosphere and the electron density structure of the...- publication PDF
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A comparison of PMIP2 model simulations and the MARGO proxy reconstruction...
Results from multiple model simulations are used to understand the tropical sea surface temperature (SST) response to the reduced greenhouse gas concentrations and large...- publication PDF
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First simultaneous multistation observations of the polar cap thermospheric winds
Based on two northern (Eureka 80.0 degrees N, 85.9 degrees W, magnetic latitude (MLAT) 88, and Resolute 74.7 degrees N, 94.8 degrees W, MLAT 83) and one southern (Jang Bogo 74.7...- publication PDF
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Short-term variation of the s = 1 nonmigrating semidiurnal tide during the...
In this study, the NCAR Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model (TIME-GCM) is used to examine short-term changes in the global structure of...- publication PDF
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The Seasonal-to-Multiyear Large Ensemble (SMYLE) prediction system using the...
The potential for multiyear prediction of impactful Earth system change remains relatively underexplored compared to shorter (subseasonal to seasonal) and longer (decadal)...- publication PDF
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Vertical structure of ocean mesoscale eddies with implications for...
The Gent-McWilliams parameterization is commonly used in global ocean models to model the advective component of tracer transport effected by unresolved mesoscale eddies. The...- publication PDF
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Understanding nighttime ionospheric depletions associated with sudden...
This study focuses on understanding what drives the previously observed deep nighttime ionospheric hole in the American sector during the January 2013 sudden stratospheric...- publication PDF
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Determination of the atmospheric lifetime and global warming potential of...
We have used the Whole Atmosphere Community Climate Model (WACCM), with an updated treatment of loss processes, to determine the atmospheric lifetime of sulfur hexafluoride...- publication PDF
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First synoptic observations of geomagnetic storm effects on the global-scale...
The Global-scale Observations of the Limb and Disk (GOLD) mission provides, for the first time, a synoptic view of the thermospheric response to a moderate geomagnetic storm at...- publication PDF
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Effect of aerosols and NOâ concentration on ultraviolet actinic flux near...
Urban air pollution absorbs and scatters solar ultraviolet (UV) radiation, and thus has a potentially large effect on tropospheric photochemical rates. We present the first...- publication PDF
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Subseasonal representation and predictability of North American weather...
This study focuses on assessing the representation and predictability of North American weather regimes, which are persistent large-scale atmospheric patterns, in a set of...- publication PDF
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Acyl peroxy nitrates link oil and natural gas emissions to high ozone...
We present measurements of ozone (O-3), acyl peroxy nitrates (APNs), and a suite of O-3 precursors made at the Boulder Atmospheric Observatory in Erie, Colorado, during summer...- publication PDF
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The role of vertical wind shear in modulating maximum supercell updraft velocities
Observed supercell updrafts consistently produce the fastest mid- to upper-tropospheric vertical velocities among all modes of convection. Two hypotheses for this feature are...- publication PDF
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Reducing aerosol forcing uncertainty by combining models with satellite and...
Aerosol forcing uncertainty represents the largest climate forcing uncertainty overall. Its magnitude has remained virtually undiminished over the past 20 years despite...- publication PDF
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Nonlinear enhancement of radiative absorption by black carbon in response to...
Black carbon (BC) strongly absorbs solar radiation, contributing to global warming. Absorption enhancement of BC particles is difficult to quantify due to an inadequate...- publication PDF
