News Center

Understanding Changes in Cloud Phase Partitioning in Mixed-phase Clouds: an Arctic Case Study
Aug 22, 2016 [ Research Highlights ]       
“A low cloud of water and ice – in Barrow, Alaska, how nice. Its structure was measured with ease – but why did the ice phase decrease?” For a springtime low-level mixed-phase stratiform cloud case from Barrow, Alaska, a unique combination of instruments and retrieval methods is combined with multiple modeling perspectives to determine key processes [...]

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Towards Retrieving Critical Relative Humidity from Ground-based Remote-sensing Observations
Aug 16, 2016 [ Research Highlights ]       
In a Global Circulation Model (GCM), cloud should form before the grid-box-mean state becomes saturated. Therefore, assumptions about sub-grid variability in temperature and water vapour are necessary, which are typically combined in the critical relative humidity (RHcrit), the relative humidity at which cloud forms a sub-saturated GCM grid box.

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Spying on Thin Ice Clouds
Aug 15, 2016 [ Feature Stories and Releases ]       
Observations of thin ice clouds are scarce, contributing to a large range of uncertainties in present-day and future simulations of the polar climates. Data from the Thin Ice Clouds in Far Infrared Experiment, or TICFIRE, and ARM's Barrow facility will help to develop a new spaced-based instrument in collaboration with the Canadian Space Agency to measure these thin ice clouds.

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ARM’s New Radar Operating Paradigm Aims to Maximize Performance
Aug 15, 2016 [ Facility News ]       
Maintaining the pulse of the radar network is vital to research Radars have been getting a lot of attention at ARM in the last few months. These instruments represent a critical part of ARM’s observation strategy. The ARM Facility operates the largest research radar network in the world, including a wide range of instruments from single-frequency profiling [...]

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Working Together to Develop New Radar Products
Aug 15, 2016 [ Facility News ]       
A joint ARM and ASR workshop turned basic instrument output into more valuable data While many of their neighbors were thinking of the sun, beaches, and waters of Long Island, a group of Atmospheric System Research scientists and ARM Climate Research Facility developers gathered at Stony Brook University (SBU) from June 23 to July 1 for an [...]

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LASSO Released First Results, Corralling Models and Measurements
Aug 15, 2016 [ Facility News ]       
The Alpha 1 release of LASSO showcases features and solicits feedback LASSO has been roping measurements and wrangling models for a year, and the project just released its first set of results, Alpha 1. LASSO: An Integral Part of ARM’s Future LASSO, or Large-Eddy Simulation (LES) ARM Symbiotic Simulation and Observation workflow, is a two-year pilot project meant [...]

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ARM Monograph is Now Available
Aug 15, 2016 [ Facility News ]       
The ARM monograph, an online document written by ARM veterans and published by the American Meteorological Society, is now fully available—all 30 chapters and its three appendices. Chronicling the history of the first two decades of ARM, this monograph, entitled The Atmospheric Radiation Measurement (ARM) Program: The First 20 Years, covers: How ARM evolved operationally and scientifically. How [...]

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Impact of External Industrial Sources on the Regional and Local SO2 and O3 Levels of the Mexico Megacity
Aug 09, 2016 [ Research Highlights ]       
Scientists determined how strongly various emissions sources affected air quality in different areas of the Mexico City Metropolitan Area.

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Early Career Funding Opportunity Available
Aug 08, 2016 [ Facility News ]       
A funding opportunity for early career researchers in universities and U.S. Department of Energy (DOE) national laboratories is available from the Office of Biological and Environmental Research (BER). The Early Career Research Program, now in its eighth year, supports the development of individual research programs of outstanding scientists early in their careers and stimulates research [...]

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MAGIC Ship-based Observations Help Validate Satellite Microwave Liquid Water Path
Aug 04, 2016 [ Research Highlights ]       
Satellite-based passive microwave (MW) liquid water path (LWP) is a fundamental quantity for climate studies, climate model validation, and validation of satellite visible/near-infrared retrievals over the oceans. Unfortunately, the lack of independent observations has prevented the evaluation of MW LWP, and thus the accuracy of satellite MW-derived LWP remains uncertain. The ship deployment of the [...]

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The Python ARM Radar Toolkit, the World's Leading Interactive Radar Toolkit
Aug 04, 2016 [ Research Highlights ]       
Weather radars provide an abundant source of data related to the conditions present in the atmosphere. The Python ARM Radar Toolkit (Py-ART) allows scientists to effectively work with this data and extract scientific insights from these large data sets. Py-ART is used for analysis of weather radar data using established routines available in the [...]

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Two AERI Installs on Two Islands in Two Months
Aug 03, 2016 [ Blog, ENA, Field Notes, LASIC ]       
I just completed the second of two Atmospheric Emitted Radiance Interferometer (AERI) installations in what is shaping up to be ARM’s year of the islands. The first was at an ARM Mobile Facility site on Ascension Island for the Layered Atlantic Smoke Interactions with Clouds, or LASIC, campaign. Ascension Island is one of the most remote [...]

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Research Balloon Lost in Alaska
Aug 01, 2016 [ Facility News ]       
A tethered balloon used for atmospheric measurements was being prepared July 27 at Oliktok Point, Alaska, when an unexpected gust of wind lifted the balloon and severed its tether cord. The balloon rose and drifted north across the Beaufort Sea, dropping to the sea roughly 60 km north of Oliktok. The balloon, which carried Atmospheric Radiation Measurement [...]

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Alpha 1 of ARM’s New Modeling Effort Now Released
Jul 31, 2016 [ Data Announcements ]       
In May 2015, the Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Climate Research Facility began a pilot project to design a routine, high-resolution modeling capability to complement ARM’s extensive suite of measurements at the Southern Great Plains megasite. This large-eddy simulation (LES) modeling capability has been named LASSO—the LES ARM Symbiotic Simulation and Observation [...]

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Data Quality Assessment for ARM Radiation Data (QCRAD) VAP Now Operational
Jul 31, 2016 [ Data Announcements ]       
The Data Quality Assessment for ARM Radiation Data (QCRAD) value-added product (VAP) is now running operationally for the ARM Mobile Facility deployment at Oliktok Point, Alaska, and Eastern North Atlantic site in the Azores. QCRAD has long been the recommended ARM datastream for broadband surface irradiance measurements. This VAP applies multiple data quality checks, applies [...]

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New Release of Radar CFAD Data Product for ARM Radar Simulator
Jul 31, 2016 [ Data Announcements ]       
An ARM cloud radar simulator was developed to facilitate direct comparison of climate model output with the ARM ground-based cloud radar measurements by considering limitations and features of the observing process. As part of the effort, this global climate model oriented ARM cloud radar data product, the Contoured Frequency by Altitude Diagram (CFAD), is produced [...]

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Reprocessed Quality Controlled Eddy Correlation Flux Measurement VAP for GoAmazon
Jul 31, 2016 [ Data Announcements ]       
Quality Controlled Eddy Correlation Flux Measurement (QCECOR) value-added product data were reprocessed for the first ARM Mobile Facility (AMF1) deployment at Manacapuru, Brazil, from April 2014 to December 2015, as a critical component of a two-year scientific collaborative field campaign, the Green Ocean Amazon (GoAmazon) 2014/15. The QCECOR data provide surface sensible and latent heat [...]

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Reflections on LASIC Installation Trip to Ascension Island
Jul 29, 2016 [ Blog, Field Notes, LASIC ]       
As I sat waiting to board the flight contracted by the Royal Air Force out of Brize Norton in the United Kingdom to Ascension Island, I was excited but already jet-lagged. I had met up with some of the aerosol instrument mentors and site data systems experts from Brookhaven National Laboratory (BNL) and Argonne National [...]

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An Extreme Case of Cooling
Jul 29, 2016 [ Blog, Data Quality Office, Field Notes ]       
Editor’s note: Brett Borchardt, a data quality analyst in the ARM Data Quality Office at the University of Oklahoma at Norman, sent this update. I’ve been investigating an impressive temperature drop at the ARM deployment on the southern tip of Antarctica's Ross Ice Shelf. On July 4, ARM’s Surface Meteorological Instrumentation (MET) instrumentation captured an extreme case of in [...]

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A Day in the Life of a DQ Analyst
Jul 29, 2016 [ Blog, Data Quality Office, Field Notes ]       
Editor’s note: Brett Borchardt, a Data Quality Analyst in the ARM Data Quality Office at the University of Oklahoma at Norman, sent this update. Every week, data quality analysts working in the ARM Data Quality Office sift through thousands of days worth of data collected by instruments worldwide in search of even the slightest hint of a looming [...]

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The Spectroscopic Foundation of Radiative Forcing of Climate by Carbon Dioxide
Jul 21, 2016 [ Research Highlights ]       
We explored the state-of-the-science of how rising atmospheric CO2 concentrations warm the climate system through radiative forcing caused by spectroscopic absorption features. We found that uncertainties in the absorption line parameters and understanding of the shape of CO2 lines, both of which are important for CO2 radiative forcing, are much smaller than the actual forcing.

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Field Testing the Next-Generation of Radiosondes
Jul 21, 2016 [ Research Highlights ]       
During 3-8 June 2014, an intercomparison study of Vaisala radiosondes RS92 (the current ARM instrumentation) and RS41 (next generation) was undertaken at the ARM SGP site. The results indicate that the sounding measurements generally agree well within manufactured-defined uncertainties with notable exceptions when exiting liquid cloud layers where evaporative cooling impacts are mitigated for the [...]

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Trace Gas Removal by Deep Convective Storms
Jul 20, 2016 [ Research Highlights ]       
Deep convective storms have a large impact on the climate by sending atmospheric trace gases high into the atmosphere where they participate in particle formation and ozone formation that affect the amount of sunlight, or radiative energy, that passes through the atmosphere to Earth’s surface. Understanding how storms, or convective systems, transport trace-gas concentrations to [...]

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Observing the Amazon: the Role of Time and Place in Cloud Measurements
Jul 20, 2016 [ Research Highlights ]       
Research led by Department of Energy scientists at Pacific Northwest National Laboratory laid the groundwork for future explorations of the Green Ocean Amazon, GOAmazon, 2014/15 field campaign data sets by documenting the variability in space and time of deep convection around the field campaign surface sites distributed upwind and downwind of Manaus, Brazil. Understanding the [...]

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Capturing Biogenic Volatile Organic Compounds in a Coupled-Model System Compared to Observation
Jul 20, 2016 [ Research Highlights ]       
Current climate models still have large uncertainties in estimating biogenic (naturally emitted) trace gases, which can significantly affect atmospheric chemistry and secondary aerosol formation that ultimately influence the capacity of aerosol particles to affect Earth’s energy balance (aerosol radiative forcing) and air quality. These uncertainties result from many factors, including uncertainties in land-surface processes (exchanges [...]

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Hiding in Plain Sight: a Less-Explored Secret of Secondary Organic Aerosols
Jul 19, 2016 [ Research Highlights ]       
More than 50% of the fine atmospheric aerosol particle mass is often comprised of organic aerosols, most of which are secondary organic aerosols (SOA), formed by atmospheric oxidation of organic gases. Recent measurements suggest that a major fraction of SOA has volatility that is orders of magnitude lower than previously assumed. It is important to [...]

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Getting Cloud Ice from Pollution
Jul 19, 2016 [ Research Highlights ]       
Atmospheric soot (black carbon) particles absorb solar energy to warm the atmosphere—yet high in the atmosphere they may instigate cloud ice formation. But when these particles mix with other aerosols and compounds in the atmosphere, their ice-forming (ice-nucleating) ability suffers, thus altering the properties of pure ice clouds (cirrus), vital for their impact to moderate [...]

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Three Dimensions Are Better Than Two, When It Comes to Representing Aerosols
Jul 19, 2016 [ Research Highlights ]       
A research team led by scientists at Pacific Northwest National Laboratory developed a novel three-dimensional particle representation for aerosol modeling. This new add-on solves for particle size, the amount of black carbon in the particle, and the ability of the particle to draw moisture, or hygroscopicity. All three attributes are needed to accurately estimate how [...]

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ARM Instruments Reel in Decades of Data
Jul 18, 2016 [ Feature Stories and Releases ]       
Looking back on climate gear both rugged and precise This is the second article about a recently published monograph on the first 25 years of the ARM ClimateResearch Facility. During its more than two data-rich decades, the Atmospheric Radiation Measurement (ARM) Climate Research Facility has provided science with many enduring gifts, including an organizational template for climate research across the [...]

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Reconfiguring ARM: Arctic Eyes in the Sky
Jul 18, 2016 [ Feature Stories and Releases ]       
The Inaugural Campaigns for ARM Research using Unmanned Systems—or ICARUS—is underway at Oliktok Point, Alaska. In response to researcher input, ICARUS was developed as the Atmospheric Radiation Measurement (ARM) Climate Research Facility's first initiative to begin routine operations using unmanned aerial systems (UAS) and tethered balloon systems (TBS) to collect spatial information about the rapidly changing arctic environment.

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In India, a Science Journal Celebrates Insights from a Ganges Valley Climate Study
Jul 18, 2016 [ Feature Stories and Releases ]       
ARM instrumentation played a big role in the first joint U.S.-Indian experiment of its kind The Ganges River begins in a narrow valley in the Himalayas and flows eastward through a vast valley of farms, cities, power plants, and factories before exiting mightily into the Bay of Bengal. The 2,500-kilometer waterway, fed by Himalayan runoff and [...]

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Next Round of Deadlines for Small Campaigns Coming Up
Jul 18, 2016 [ Facility News ]       
The next deadline to propose for smaller field campaigns will be August 22. Small campaigns do not require a full deployment of ARM Facility equipment, like an ARM mobile or aerial facility. They require just an instrument or two, or are in conjunction with a larger facility operation. Costing less than $25,000, these campaigns give [...]

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ARM Azores Observations Help Identify Deficiencies in Climate Model Simulations of Low Clouds
Jul 16, 2016 [ Research Highlights ]       
The correctness of low-cloud representation in climate models is crucial to climate change projections and needs to be comprehensively evaluated.

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Pollution from a Megacity in the Amazon: the Case of Manaus, Brazil
Jul 12, 2016 [ Research Highlights ]       
This special journal issue outlines the Observations and Modeling of the Green Ocean Amazon (GoAmazon2014/5) Experiment. The field campaign research sought to quantify how aerosol and cloud life cycles in a clean background in the tropics are influenced by pollutant outflow from a large tropical city. The team used ground-based research sites and aircraft measurement [...]

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Two-Column Aerosol Project: Impact of Elevated Particle Layers on Particle Optical Depth
Jul 11, 2016 [ Research Highlights ]       
A group of DOE-funded scientists on an ARM field campaign discovered elevated levels of aerosols even on Cape Cod's cloud-free days—and these aerosols have a large impact on the amount of sunlight reaching the surface. The year-long study included measurements to examine the chemical composition of the particles, the way they reflect or scatter light, [...]

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Fall Speeds of Cirrus Crystals Faster Than Expected
Jul 11, 2016 [ Research Highlights ]       
The fall speeds of high cirrus cloud crystals depend upon crystal mass, for which no direct measurements exist. Based on new measurements of crystal images, calculated mass yields fall speeds as a function of maximum particle dimension that are, surprisingly, roughly twice as large as derived in the most commonly used past studies.

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Sub-micrometre Particulate Matter Is Primarily in Liquid Form over Amazon Rain Forest
Jul 07, 2016 [ Research Highlights ]       
A team of scientists, including U.S. Department of Energy-funded researchers, found that particles with diameters smaller than 1 μm are primarily in liquid form over the tropical rainforest of central Amazonia, where the relative humidity is greater than 80% more than 70% to 80% of the time during the dry and wet seasons. These findings are [...]

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Urban Emissions Significantly Enhance SOA Production at a Rural Site in the NE US
Jun 12, 2016 [ Research Highlights ]       
During our study, we observed that aerosol concentration and composition at a rural site in the Northeastern U.S. were influenced strongly by upwind urban emissions. A possible reason is that anthropogenic pollutants advected from urban areas interacted with biogenic emissions in the rural region and led to a substantial enhancement of secondary organic aerosol production.

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