News Center

Spectrally Invariant Properties of Clouds in Transition Zones During the MAGIC Field Campaign
Sep 27, 2016 [ Research Highlights ]       
Knowledge of the variability of cloud properties in transition zones (regions between the definitely cloudy and clear sky columns) would help us understand how microphysical properties of clouds can affect cloud-aerosol interactions and how the clouds are mixed during the entrainment of dry air. This paper uses the spectrally invariant method to analyze [...]

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Regional Influence of Aerosol Emissions from Wildfires Driven by Combustion Efficiency
Sep 27, 2016 [ Research Highlights ]       
During our study we found that combustion processes of wildfires strongly influence organic aerosol concentrations and properties on a regional scale and that more flaming burns emit less aerosol mass but more oxidized organic aerosol. We also found that secondary organic aerosol formation in wildfire plumes may have been balanced by primary organic aerosol evaporation, [...]

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Black Carbon Aerosols Alter Cloud Microphysical Properties
Sep 22, 2016 [ Research Highlights ]       
Black carbon is usually mixed with other aerosol species within individual aerosol particles. To accurately simulate the impact of black-carbon-containing aerosol particles on clouds, it is important to represent particle composition. Neglecting this information causes errors in the prediction of cloud droplet number concentration and droplet sizes, and of the amount of black carbon that [...]

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A Major Artifact in Aerosol-Cloud-Interaction Studies Discovered from Azores Measurements
Sep 21, 2016 [ Research Highlights ]       
Using 19 months of cloud and aerosol measurements made on Graciosa Island in the Azores, the response of marine boundary layer (MBL) non-precipitating cloud properties to changes in aerosol loading is examined. How meteorological parameters affect the diversity in the sensitivity of these MBL clouds to aerosol perturbations and the magnitude of the aerosol first [...]

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DOE User Facilities Join Forces to Study Molecular Processes with Global Effects
Sep 19, 2016 [ Feature Stories and Releases ]       
EMSL will analyze aerosol samples gathered at an ARM site to better understand how microscopic particles and processes affect climate on a global scale Two U.S. Department of Energy (DOE) user facilities are sponsoring scientists to learn more about aerosols, tiny particles that are suspended in the atmosphere, and the role they play in weather and [...]

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Upcoming Election for ARM User Executive Committee
Sep 19, 2016 [ Facility News ]       
Make a Difference: Get Involved Nominations are underway for the ARM Facility’s User Executive committee (UEC). The UEC is made up of scientific users of ARM data. Members are selected according to popular vote by the users according to science areas. This year, in addition to soliciting nominations for science themes, we are accepting nominations to add [...]

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A-OK in Oklahoma: SGP Reconfiguration is Right on Track
Sep 19, 2016 [ Facility News ]       
As part of the next-generation ARM Climate Research Facility initiative, the Southern Great Plains site in Oklahoma has been undergoing a reconfiguration, including moving the Raman lidar, to become a “megasite."

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Capture, Send, Check, Store: ARM’s Continuous Flow of Climate Data
Sep 19, 2016 [ Feature Stories and Releases ]       
From instruments to archives, terabytes on Sun, Clouds, Wind, and Gases In the sky over the Azores, in the remote Atlantic Ocean, a bank of clouds dips toward a radar on Graciosa Island. Data point. In Oliktok, Alaska, arctic sleet patters against a sensor. Data point. Near a wheat field in flat central Oklahoma, an airborne particle falls [...]

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ARM Data Flow: A Look Back
Sep 19, 2016 [ Feature Stories and Releases ]       
From its inception in 1990, the Atmospheric Radiation Measurement (ARM) Climate Research Facility has focused on four topics: science, instruments, sites, and data. Over time, the science focus evolved, expanding from radiative transfer to atmospheric processes and then to improved parameterizations for models. Instruments got more robust and numerous. The number of sites grew; ARM added [...]

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ARM Principal Investigator Quoted in Science
Sep 19, 2016 [ Feature Stories and Releases ]       
LASIC principal investigator was quoted in a Science news story about African smoke and ocean clouds. Science magazine quoted Paquita Zuidema, University of Miami, in her role as lead scientist for ARM’s Layered Atlantic Smoke Interactions with Clouds (LASIC) campaign. Published August 25, “NASA Aircraft Probe Namibian Clouds to Solve Global Warming Puzzle” describes how NASA’s [...]

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Doing the Translator Shuffle: Changing Roles at ARM
Sep 19, 2016 [ Facility News ]       
ARM Translators taking on new challenges: Mike Jensen steps down, Laura Riihimaki and Scott Giangrande step up The role of lead translator is changing hands as Laura Riihimaki, Pacific Northwest National Laboratory (PNNL), takes over for Mike Jensen, Brookhaven National Laboratory (BNL). Scott Giangrande, BNL, is also joining the translator team. Speaking the Language of Data Translators [...]

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HI-SCALE: Phase II
Sep 07, 2016 [ Blog, Field Notes, HI-SCALE ]       
The second phase of HI-SCALE is underway! And, somehow we are surviving the heat and humidity! The G-1 aircraft arrived in Bartlesville on Saturday, August 24, and we spent the next day ensuring the plane and instruments were ready for flight missions. Between Monday, August 25, and Labor Day, we completed seven research flights on five [...]

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The Details of the Growth of Atmospheric Particles to Climate-relevant Sizes
Sep 01, 2016 [ Research Highlights ]       
Freshly nucleated particles in the atmosphere , ~1 nm in diameter, form from low-volatility gaseous species. These particles can either grow to climate-relevant sizes, larger than 50-100 nm in diameter, or are lost by coagulation with larger particles. If a particle reaches a climate-relevant size, it can affect climate through efficiently scattering or absorbing radiation [...]

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The Time Scales of Variability of Marine Low Clouds
Sep 01, 2016 [ Research Highlights ]       
Day-to-day weather variations have a dominant influence on marine boundary layer inversion strength and low clouds, compared to other time scales. This study empirically estimates the association of low cloud amount to inversion strength, sea surface temperature (SST), and vertical velocity on subdaily (diurnal), multiday (mostly synoptic), multimonth (mostly seasonal), and multiyear time scales using 26.5 [...]

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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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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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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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