News Center

Supporting Scientist Positon for ARM at Lawrence Livermore National Laboratory
Nov 26, 2014 [ Employment Opportunities ]       
The Cloud Processes Research (CPR) Group within the Atmospheric, Earth and Energy Division (AEED) in the Physical and Life Sciences Directorate has an opening for a supporting scientist to join the Atmospheric Radiation Measurement (ARM) Climate Research Facility data infrastructure. The ARM Facility Infrastructure Team develops value-added products from ARM field measurements to support cloud [...]

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Collaborators from the United States and Brazil Gather in D.C. to Discuss GOAMAZON
Nov 20, 2014 [ Facility News ]       
Last month, researchers from the United States and Brazil came together at a symposium to present findings from their studies on the Amazon. The meeting, “FAPESP-U.S. Collaborative Research on the Amazon,” was organized by the São Paulo Research Foundation Fundação de Apoio à Pesquisa do Estado do São Paulo (FAPESP) in partnership with the U.S. Department [...]

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Double Bonus: Win-Win for Atmospheric Particles
Nov 18, 2014 [ Research Highlights ]       
It’s a slam dunk for scientists measuring atmospheric particle properties. Typically calculated from their chemical composition and size distribution data, the larger particles often escape characterization. Scientists at Pacific Northwest National Laboratory and the University of Colorado developed a new method that simultaneously connects two critical properties: real refractive index, a measure of how much [...]

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Around the World in 52 Months
Nov 14, 2014 [ Feature Stories and Releases ]       
The Department of Energy has selected six field campaigns to take place from 2015 through most of 2019. These new efforts kick off in the summer of 2015 at the Southern Great Plains site and take the first ARM Mobile Facility from Brazil to Ascension Island, located in the southeast Atlantic Ocean between South America and Africa, in spring 2016.

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University of Miami seeking Faculty in the Department of Atmospheric Sciences
Nov 07, 2014 [ Employment Opportunities ]       
The Department of Atmospheric Sciences at the University of Miami's Rosenstiel School of Marine and Atmospheric Science invites candidates for a tenure-track faculty position. Candidates with expertise in the experimental research areas of boundary layer meteorology, cloud and aerosol processes, radar meteorology and other types of remote and in-situ observations are especially welcome. The successful [...]

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Observing Warm Clouds in 3D Using ARM Scanning Cloud Radars and a Novel Ensemble Method
Nov 05, 2014 [ Research Highlights ]       
Boundary-layer clouds make a significant contribution to the planetary albedo and thus are fundamentally important to the Earth’s radiation budget. Due to their complex turbulent structures, coupled with a strong susceptibility to aerosol, they remain a key source of uncertainty in climate projections. While Atmospheric Radiation Measurement Climate Research Facility (ARM)’s long-term observations from vertically [...]

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Under the Radar—This Time in Retirement
Nov 05, 2014 [ Facility News ]       
After 30 years with Pacific Northwest National Laboratory, including the last two decades as leader of ARM’s radar engineering group, Kevin Widener retired this summer. Widener’s hard work and dedication to developing ARM’s one-of-a-kind cloud radar network were instrumental to the success and growth of the ARM Facility, which now boasts nearly three dozen radars. [...]

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Megasites Accept Mega Challenge: New Directions Take Formation in First Workshop
Nov 04, 2014 [ Facility News, Publications ]       
With the growing interest in high-resolution model simulations, the Department of Energy Climate Environmental Sciences Division is hosting a series of workshops to focus on key scientific needs, gaps, and priorities in process model understanding and climate model prediction through the strategic deployment and operation of routine high-resolution modeling at the future "megasites" at the North Slope of Alaska (NSA) and Southern Great Plains (SGP) for the ARM Climate Research Facility.

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Validation of Climate Model Ice Cloud Properties
Oct 31, 2014 [ Research Highlights ]       
General circulation models are used for understanding the past, present, and future climate. To be able to project future climate it is important that models provide a realistic depiction of the physical processes. Researchers at the National Center for Atmospheric Research (NCAR) have recently addressed how well properties of ice particles are represented in the [...]

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Fast and Rigorous: Finding Surface Reflectivity by Looking Up at Clouds
Oct 28, 2014 [ Research Highlights ]       
Capturing sunlight reflected off the Earth's surface and bounced off a cloud back to the Earth is an effective measure of surface reflectivity—or surface albedo, the measure of how mirror-like the Earth's surface is. Researchers at Pacific Northwest National Laboratory developed a new way to measure surface albedo by capturing that cloud-bounced sunlight. In collaboration [...]

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ARM Scientists Lead Radar Courses at ERAD2014
Oct 21, 2014 [ Facility News ]       
In September, radar engineers and science colleagues gathered in Garmisch-Partenkirchen, Germany, for the 8th European Conference on Radar in Meteorology and Hydrology. Leading ARM radar experts and data users shared their advances during two short-course workshops. A third short course was coordinated by Atmospheric System Research (ASR) colleagues on “Applications of Dual-Polarization Weather Radars.” Open-Source Radar [...]

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Droplet Number Concentration Value-Added Product Now Operational
Oct 20, 2014 [ Data Announcements ]       
Cloud droplet number concentration is an important factor in understanding aerosol-cloud interactions. As aerosol concentration increases, it is expected that droplet number concentration will increase and droplet size will decrease for a given liquid water path. This will greatly affect cloud albedo as smaller droplets reflect more shortwave radiation; however, the magnitude and variability of [...]

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Dust Takes Detour on Ice-Cloud Journey
Oct 15, 2014 [ Research Highlights ]       
Wrapped in pollution, dust diverts from its usual course and steers clear of water. Researchers at Pacific Northwest National Laboratory found the result closes one more gap in understanding how and when cloud ice crystals form. They found that dust, usually a primary catalyst encouraging ice formation, when modified by pollution from combustion, becomes less [...]

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2D Best Estimate Data Sets From MC3E Now Available
Oct 14, 2014 [ Data Announcements ]       
Data sets for the ARM Best Estimate 2-Dimensional Grid (ARMBE2DGRID) and Station-based Surface (ARMBESTNS) are now available for the Midlatitude Continental Convective Clouds Experiment (MC3E) period, which occurred during April to June 2011. The primary goal of these two data sets is to provide 2-dimensional (2D) spatial data of important surface variables to facilitate studies on [...]

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Conversational Climate Change
Oct 14, 2014 [ Education ]       
In order to help their fellow scientists and the general public have science-based conversations with their families and communities about climate change, Doug Sisterson, a long time ARM Climate Research Facility team member, and his colleague, Seth Darling, have written a short book that takes a humorous, conversational style approach to the often hyper-technical and jargon-filled [...]

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Interactions Between Cumulus Convection and Its Environment as Revealed by MC3E
Oct 13, 2014 [ Research Highlights ]       
After decades of effort, accurately representing cumulus convection is still one of the most challenging tasks for weather and climate modeling. This is primarily because the interaction between cumulus convection and its environment has not been fully understood. Previous budget diagnostic studies have often targeted tropical convective systems given the dominant role these convective systems [...]

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ARM Educational Outreach Celebrates Earth Science Week 2014
Oct 13, 2014 [ Education ]       
This week, Professor Polar Bear and the Climate Kids are traveling around the U.S. to promote Earth Science Week. ARM Educational Outreach was invited to contribute educational materials for tool kits that will be distributed to teachers at the American Geosciences Institute (AGI)’s 2014 Earth Science Week. The annual event, which takes place October 12-18, [...]

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Large-Scale Forcing Data from the R/V Roger Revelle
Oct 10, 2014 [ Data Announcements ]       
Constrained variational analysis forcing data centered at the R/V Roger Revelle are now available for the Dynamics of the Madden-Julian Oscillation (DYNAMO) and the ARM Madden-Julian Oscillation [MJO] Investigation Experiment [AMIE] on Gan Island, or AMIE-Gan field campaign. Due to the lack of a sounding array on the Revelle, these forcing data were developed based on [...]

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Large-Scale Forcing Data for AMIE-GAN Updated
Oct 08, 2014 [ Data Announcements ]       
The ARM Madden-Julian Oscillation [MJO] Investigation Experiment [AMIE] on Gan Island, or AMIE-Gan field campaign collected necessary data for studies of the initiation, propagation, and evolution of MJO and its association with convective clouds. In order to enable single column and/or high-resolution model simulations of the field campaign period, model forcing data sets were developed. Three [...]

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First Observations of Tracking Clouds Using Scanning ARM Cloud Radars
Oct 05, 2014 [ Research Highlights ]       
Scanning cloud radars provide new opportunities to map clouds and their evolution. Specifically, these radars observe cloud particles well in advance of large droplet formation, while also capturing the clouds at spatial and temporal scales sufficient for continuous tracking algorithms. To better demonstrate the capabilities of the new Scanning ARM Cloud Radars (SACR) at the [...]

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Validation of CERES-MODIS Cloud Retrievals Using the Azores Data
Sep 26, 2014 [ Research Highlights ]       
Marine boundary layer (MBL) cloud properties derived for the National Aeronautics and Space Administration (NASA) Clouds and the Earth's Radiant Energy System (CERES) Project using Terra and Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) data are compared with observations taken at the ARM Mobile Facility at the Azores (AMF-Azores) site from June 2009 through December 2010. [...]

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Diurnal Variation of MBL Cloud Properties over the Azores
Sep 26, 2014 [ Research Highlights ]       
For the single-layered marine boundary layer (MBL) cloud microphysical properties, Dong, Xi, and Wu (2014) provided the diurnal variations of cloud liquid water path (LWP) and liquid water content (LWC). However, they only presented the daytime LWP, LWC, cloud-droplet effective radius (re), number concentration (Nd), and cloud optical depth (τ), as well as surface measured [...]

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Effects of Sea Spray on the Thermodynamics of the Hurricane Boundary Layer
Sep 24, 2014 [ Research Highlights ]       
The effects of sea spray on surface fluxes under strong winds is usually attributed to surface layer dynamics in the vicinity of the ocean surface. We propose that the main effects of sea spray on surface fluxes and intensity of hurricanes are related to the microphysical effects of spray drops penetrating deep convective clouds in [...]

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A New Theory of Time-dependent Freezing and Its Application to Investigation of Formation of Hail
Sep 24, 2014 [ Research Highlights ]       
A new theory of wet growth of hail takes into account the inhomogeneities of surface temperature and of liquid film over the surface of the particle and parameterizes effects of non-sphericity of hail particles on their growth by accretion (Figure 1a). The time-dependent process of raindrop freezing as well as freezing of accreted water by [...]

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Turn Trash Into Treasure: Continental Warm Cloud Properties Derived from Unexploited Solar Background Signals
Sep 20, 2014 [ Research Highlights ]       
Low-altitude boundary layer clouds strongly influence global climate through their impact on Earth’s radiation and hydrological cycle. Therefore, long-term global measurements are crucial for providing direct observational constraints to improve our knowledge of cloud and precipitation formation, and to better represent these clouds in weather and climate models. At the Atmospheric Radiation Measurement [...]

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Growing More Effective Ways to Measure Climate Change
Sep 17, 2014 [ Research Highlights ]       
Life on earth depends on the movement of carbon dioxide through the environment. Plants take it in through photosynthesis, people and animals breath it out, the burning of fossils fuels sends it back into the atmosphere. According to the U.S. Environmental Protection Agency, in 2012, carbon dioxide accounted for about 82% of all greenhouse gas [...]

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Deciphering Raindrop Collisions with Dual-polarization Radar
Sep 01, 2014 [ Research Highlights ]       
As raindrops descend to the surface, they undergo a variety of collisions with one another. These collisions can lead to coalescence of the drops into a larger one, breakup of the colliding drops into small fragments, or can be inconsequential. These processes affect the evolution of the drop size distribution (DSD), ultimately influencing the potential [...]

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