Research Highlights

Ice Concentration Retrieval in Stratiform Mixed-Phase Clouds Using Cloud Radar Measurements
Jul 21, 2014       
The production of ice particles in clouds has significant impacts on their precipitation efficiency, lifetime, and radiative properties. Recent observations reveal that mixed-phase clouds, which contain both liquid droplets and ice particles, have a large global coverage and are the dominant cloud type over polar regions. The ice number concentrations (Ni) in these clouds are [...]

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Precipitation Estimation from the ARM Distributed Radar Network
Jun 20, 2014       
Recently, the US Department of Energy's (DOE) Atmospheric Radiation Measurement (ARM) Climate Research Facility outfitted its fixed and mobile sites with scanning dual-polarized X/C-band weather radars. These systems are designed for improved observation of cloud and precipitation evolution, dynamic and microphysical processes and longer-term precipitation trends. An initial priority has been the development of a [...]

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Comparison of Mixed-layer Heights from Airborne HSRL and WRF-Chem During CARES
Jun 05, 2014       
The NASA Langley Research Center (LaRC) airborne High Spectral Resolution Lidar (HSRL) was deployed to California on board the NASA LaRC B-200 aircraft to aid in characterizing aerosol properties during the California Research at the Nexus of Air Quality and Climate Change (CalNex) and Carbonaceous Aerosol and Radiative Effects Study (CARES) field campaigns in May [...]

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Accuracy of GFS and ECMWF Hurricane Sandy Track Forecasts Dependent on Cumulus Parameterization
May 19, 2014       
Hurricane Sandy (2012) was an extremely damaging late-season storm that significantly impacted much of the northeastern United States. Aside from the damage to life and property, Hurricane Sandy was also noteworthy for its large forecast track differences very early in its life cycle. Roughly one week before landfall, the European Center for Medium-range Weather Forecasting [...]

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The Emergence of Open Source Software for the Weather Radar Community
May 15, 2014       
Since the emergence of weather radar technology in the 1940s, research has sought to tap the full potential of weather radar observations. During the digital age, improvements in radar technology have been closely linked to advancements in computer science and software engineering. Making use of modern radars is not possible without software. Open Source Software [...]

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MBL Aerosol Properties and Their Impact on CCN at the Azores-AMF Site
May 09, 2014       
A multi-platform data set from the Clouds, Aerosol, and Precipitation in the Marine Boundary Layer (CAP-MBL) Graciosa, Azores, 2009–2010 field campaign was used to investigate how continental aerosols influence MBL cloud condensation nuclei (CCN) number concentration (NCCN).

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Which Absorption Model Should Be Used for Supercooled Liquid Water in the Microwave?
May 03, 2014       
Accurate liquid water path (LWP) measurements are critical for a large number of atmospheric research topics. The most commonly used method to derive LWP is to retrieve it from sky brightness temperature data observed by microwave radiometers (MWRs). However, this measurement approach requires an accurate radiative transfer model that has the strength of the liquid [...]

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Parameterization of Ice Fall Speeds in Midlatitude Cirrus: Results from SPartICus
May 03, 2014       
While general circulation models (GCMs) represent the most complete description of all the interactions between the processes that define the primary cloud feedbacks on climate, this description is highly sensitive to the representation of clouds and their feedbacks. The ice fall velocity (Vi) has a strong impact on cloud radiative forcing and climate feedback due [...]

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