News Center

Young Minds Blossom During Spring STEM Events
Apr 22, 2014 [ Education, Facility News ]       
Earth Day 2014 is today, Tuesday, April 22. When Earth Day began in 1970, Senator Gaylord Nelson’s goal was to pay tribute to the environment in which we live. Since then, Earth Day has become recognized around the world as an opportunity to celebrate the environment and educate our youth about the importance of conservation [...]

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Data Developers Take Pair Programming for a Spin with Data Integrator Framework
Apr 17, 2014 [ Facility News ]       
In early April, ARM data developers at Pacific Northwest National Laboratory (PNNL) hosted their counterparts from Brookhaven National Laboratory (BNL) for three days of hands on learning and discussions about strategies for analyzing and sharing data using the ARM Data Integrator (ADI). Developed by the ARM infrastructure team, this framework: automates the process of retrieving [...]

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Assessing Aerosol Impacts on Drizzle Intensity and Frequency from AMF Data
Apr 12, 2014 [ Research Highlights ]       
Aerosols have a strong effect on climate through their potential to modify the properties of warm clouds. An increase in aerosol loading could reduce drizzle production; modulate the stability of the boundary layer; and change cloud properties, lifetime, and extent, which is referred to as the second aerosol indirect effect. Recent studies showed that global [...]

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Madden–Julian Oscillation Heating: to Tilt or Not to Tilt
Apr 10, 2014 [ Research Highlights ]       
It is hypothesized that specific cloud populations at different stages are essential to the initiation and maintenance of the Madden-Julian Oscillation (MJO). In particular, the occurrence of shallow convection that then transitions to mid-level convection before the active phase of the MJO is thought to provide lower-level heating that then promotes large-scale moisture convergence necessary [...]

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New Experiment Records Avian Migration in Oklahoma
Apr 10, 2014 [ Facility News ]       
In late March, scientists launched a new field experiment at the ARM Facility’s Southern Great Plains (SGP) site in Oklahoma to collect data about the flight preferences of migrating birds. For the next two months, a field team led by University of Oklahoma is conducting the Spring 2014 Nocturnal Avian Migration Experiment, using a [...]

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Workshops Begin for ARM Megasites
Apr 09, 2014 [ Facility News ]       
While the mission of the ARM Climate Research Facility has not changed, it is undergoing a reconfiguration to better support the linking of ARM measurements with process-oriented models. The facility reconfiguration, presented at the recent Atmospheric System Research meeting, will involve three main components: Augmenting measurements at the ARM Southern Great Plains site and the two [...]

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Observational Analysis of Land-Atmosphere Coupling for Climate Model Evaluation
Apr 08, 2014 [ Research Highlights ]       
The state of the land can influence surface energy and moisture fluxes, boundary-layer clouds, and regional convection and precipitation, especially in summer when it couples more intensely with the atmosphere. Therefore, investigations of the cloud life cycle over continents need to consider the role played by land-atmosphere interactions. Coarse-resolution global climate models tend to simulate a [...]

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ARM Megasites Previewed at Annual Science Team Meeting
Apr 04, 2014 [ Events, Facility News, Feature Stories and Releases ]       
Research colleagues at the annual meeting of DOE's Atmospheric System Research program were among the first to hear details about the ARM Facility's plans for enhanced measurements to speed climate model advancements.

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ARM Data Archive Registered with Elsevier
Apr 02, 2014 [ Data Announcements, Facility News ]       
With an ever-increasing need to connect related pieces of information, databases rule the world. As of mid-March, the ARM Data Archive—containing two decades of continuous measurements of clouds, aerosol, precipitation, and radiative energy from ARM sites around the world—is now included on the data repository page of the highly-regarded scientific publisher, Elsevier. Listed under [...]

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Multi-scale Variations of Decade-long Cloud Fractions from Six Different Platforms over the SGP
Mar 31, 2014 [ Research Highlights ]       
For decades, researchers have intensively studied observationally based cloud fraction estimates to better understand current climate change and predict future climate variability. In this study, observationally based cloud fraction estimates from six different platforms (three ground-based estimates and three satellite-based estimates) are compared.

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MAGIC: An Interns Take
Mar 26, 2014 [ Blog, Field Notes, MAGIC ]       
Two weeks ago, I was at the Atmospheric System Research (ASR) Science Team Meeting and chaired a well-attended session on MAGIC. I gave a summary of MAGIC status and news and presented a few results on aerosol measurements taken during MAGIC. There were seven other presentations, including two from graduate students Xiaoli Zhou from McGill [...]

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Retrieving Thermodynamic Profiles in the Boundary Layer in Clear and Cloudy Conditions
Mar 22, 2014 [ Research Highlights ]       
The thermodynamic structure of the atmospheric boundary layer (BL; the lowest 1-3 km of the atmosphere) rapidly changes due to a wide range of processes, and many studies require accurate profiles of temperature and water vapor at high time-resolution in order to understand the processes at work in the BL. These profiles can be derived [...]

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Understanding the Differences Between Absolution Calibration Techniques in the Microwave
Mar 22, 2014 [ Research Highlights ]       
Microwave radiometers (MWRs) typically measure downwelling radiation between 22 and 60 GHz. The most common geophysical variable derived from these observations are liquid water path and precipitable water vapor. However, if the MWR measures radiation at several frequencies along the 22.2 GHz water vapor line (e.g., from 22.2 to 25.0 GHz) and also several frequencies [...]

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2013 ARM Annual Report Now Available
Mar 20, 2014 [ Facility News, Publications ]       
The 2013 edition of the ARM Climate Research Facility Annual Report was published in February 2014. The first 25 pages include a short overview of the Facility, followed by featured field campaigns, user research results, and summaries of infrastructure achievements. The back portion of the report includes a summary of all 2013 field campaigns conducted [...]

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Arctic Winter Frost Flowers Have Negligible Influence on Cloud Longwave Warming
Mar 19, 2014 [ Research Highlights ]       
Frost flowers are clusters of highly saline ice crystals growing on newly formed sea ice or frozen lakes. They wick brine from the surface of sea ice, and typically last about a few days after the initial formation and then are buried by snow, sublimate as sea ice grows thicker, or are blown away by [...]

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Upcoming Webinars on Arctic Black Carbon
Mar 19, 2014 [ Events, Facility News ]       
The Atmosphere Collaboration Team of the Interagency Arctic Research Policy Committee (IARPC) is hosting two webinars on black carbon, which are open to the community. Experts on both topics will be on hand to share information and answer questions in an effort to inform the IARPC Atmosphere Collaboration Team of possible future interagency activities [...]

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A Revealing Look Inside Northern Australian Wet Season Precipitation
Mar 07, 2014 [ Research Highlights ]       
Significant wet season rainfall over Darwin stems from precipitation having distinct forcing and life cycle characteristics, and these behaviors may be reflected in the longer-term observed ARM precipitation records. For example, the deeper convection that propagates over Darwin is often continental in origin, whereas shallow convection is often more maritime. Previous studies note that much [...]

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On the Amazon: G-1 Take One
Mar 06, 2014 [ Blog, Field Notes, GOAMAZON ]       
G-1 flight #1 has successfully been completed! Here’s the big white bird waiting for ARM Aerial Facility (AAF) crew and SOBs, or Scientists on Board, (to the right): Left to right: John Hubbe, flight scientist, Pacific Northwest National Laboratory (PNNL) Fan Mei, aerosol mentor and flight support, PNNL Duli Chand, aerosol instrument mentor, PNNL John Shilling, scientific crew and instrument [...]

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MBL Cloud Properties Derived from the Azores-AMF Observations
Mar 04, 2014 [ Research Highlights ]       
Between June 2009 and December 2010, at the ARM Azores site, a 19-month record of total, single-layered low (< 3 kilometers), middle (3-6 kilometers), and high (> 6 kilometers) cloud fractions (CFs), and the single-layered marine boundary layer (MBL) cloud macrophysical and microphysical properties was generated from ground-based measurements. This is the most comprehensive data [...]

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The Organic Molecules Explaining New Particle Growth in the Boreal Forest
Mar 04, 2014 [ Research Highlights ]       
The growth of newly formed particles from sizes of less than three nanometers up to the sizes of cloud condensation nuclei (about one hundred nanometers) in many continental ecosystems require abundant, essentially non-volatile organic vapours. However, the sources and compositions of such vapors were previously unknown. This research found that ozonolysis of monoterpenes, a [...]

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Off the Amazon: Building Bridges Through Science
Mar 03, 2014 [ Blog, Field Notes, GOAMAZON ]       
Last week, I joined science collaborators from the United States and Brazil in Manaus, Amazonas, as the first intensive measurement phase began for the Green Ocean Amazon (GOAMAZON) field campaign. In their opening remarks on Tuesday, several representatives from sponsoring organizations and participating research institutions emphasized the importance of this research, the relationships and [...]

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Arctic Multilayered Mixed-phase Cloud Processes
Feb 19, 2014 [ Research Highlights ]       
Over the North Slope of Alaska, researchers used cloud radar Doppler velocity spectra, lidar backscattering coefficients and depolarization ratios, and aircraft in situ measurements to investigate microphysical processes occurring in a case of multilayered, mixed-phase clouds.

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Measured Parameterization of Fire Aerosol Single Scattering Albedo Using Combustion Efficiency
Feb 03, 2014 [ Research Highlights ]       
Biomass burning (BB) is one of the largest sources of carbonaceous aerosols that are known to affect the radiative balance of the Earth (Bond et al. 2013). The net BB radiative forcing is small (0.0 ± 0.20Wm 2) (IPCC 2013), but very uncertain, due to the need to resolve the balance between the positive forcing [...]

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