News Center

Aerosol Measurement Science Group Charter Now Available
Mar 26, 2015 [ Facility News, Publications ]       
The Atmospheric Radiation Measurement (ARM) Climate Research Facility has established a charter for a new Aerosol Measurement Science Group (AMSG). Tasked with providing enhanced coordination of ARM Facility observations of aerosols and atmospheric trace gases with the needs of its users, the group’s main objective is to ensure advanced, well-characterized measurements and data products for [...]

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DOE Seeking ASR Program Manager
Mar 25, 2015 [ Employment Opportunities ]       
DOE’s Office of Biological and Environmental Research is hiring a second federal program manager for the Atmospheric System Research (ASR) program. The incumbent will serve as a recognized scientific authority and expert in climate research with emphasis on atmospheric system research, and as such, have the responsibility to plan, coordinate, implement, and evaluate research programs [...]

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NOAA Environmental Modeling Center seeking Support Scientist
Mar 13, 2015 [ Employment Opportunities ]       
I.M. Systems Group (IMSG), a federal contractor, is seeking to fill a position for a support scientist. The successful candidate will provide science and software engineering support to assist the EMC’s Global Weather and Climate Modelling Branch (GWCMB) in the development, testing and evaluation, monitoring, maintenance and implementation of advanced physics in global NOAA Environmental [...]

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Joint Meeting to Connect Young Researchers and Federal Representatives
Mar 13, 2015 [ Events ]       
The 13th Atmospheric Chemistry Colloquium for Emerging Senior Scientists (ACCESS XIII) brings together young researchers in atmospheric chemistry and representatives of the principal federal agencies that fund research to engage in scientific discussion and interaction. The meetings will forge future professional relationships and benefit the atmospheric science community by spreading awareness of innovations in atmospheric [...]

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Are Increases in Thunderstorm Activity in Southeast China Related to Air Pollution?
Mar 12, 2015 [ Research Highlights ]       
Pollution aerosols are thought to have an invigorative effect on convective clouds by suppressing warm precipitation in moist and convectively unstable environments. As clouds develop to above the freezing level, mixed-phase clouds containing ice and supercooled water can grow further more readily and induce cloud electrification and thunderstorms during summertime. In southeastern China, the summer [...]

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Strongly Absorbing Aerosols Affect Retrievals of Cloud Optical Depth
Mar 12, 2015 [ Research Highlights ]       
Surface-based and satellite remote sensing techniques have proven indispensable for learning more about cloud temporal and spatial variations. Comparisons between cloud properties retrieved from surface and spaceborne platforms are commonly done as a way of validating satellite retrievals. Observations made at the surface are often treated as the “ground-truth” with respect to satellite retrievals. Both [...]

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Filling Gaps Within Instrument Records
Mar 09, 2015 [ Research Highlights ]       
The ARM SGP site in Lamont, Oklahoma, is home to one of the longest records of actively sensed cloud information anywhere on the planet. Despite the best efforts of the program, instruments occasionally misbehave or are taken down for maintenance, resulting in holes within this record. Utilizing the Active Remote Sensing of Clouds Value-Added Product [...]

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Quantifying the Importance of Cold Pool Mechanisms for Convection Triggering
Mar 09, 2015 [ Research Highlights ]       
The organization of the subcloud layer into cold pools, areas of evaporatively cooled downdraft air spreading on the surface, is one of the key processes that help sustainin deep convection. It has long been known cold pools can spawn new convective cells by mechanically lifting air along their gust front. Such lifting could be the [...]

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Modeling Precipitating Cumulus Congestus Observed by the ARM Radar Suite During the MC3E Field Campaign
Mar 04, 2015 [ Research Highlights ]       
Much of the uncertainty in climate model projections stems from the limited understanding of cloud and precipitation processes and the parameterization of these processes in global climate models (GCMs). Typically, results from cloud-resolving models (CRMs) or large-eddy simulation (LES) models serve as benchmarks for developing and tuning single-column models (SCMs), which, in turn, form the [...]

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Evaluation of Trigger Functions for Convective Parameterization Schemes
Mar 03, 2015 [ Research Highlights ]       
In a convective parameterization scheme, the trigger function activates the onset of convection. Hence, an accurate trigger function is important to the correct simulation of convection in global climate models (GCMs). However, the formulation of trigger functions in many of convective schemes is ad hoc and convection is often activated too easily. The over-activation of [...]

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New Advisory Group Focuses Efforts on Unmanned Aircraft Systems
Mar 03, 2015 [ Facility News ]       
The Arctic is experiencing rapid climate change with nearly double the rate of surface warming observed elsewhere on the planet. Currently, the reasons for arctic amplification are not well understood, nor are the impacts to the global carbon cycle well quantified. Atmospheric researchers are using unmanned aircraft to study problems requiring frequent or long-duration observations [...]

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User Executive Committee Chairs Named
Mar 03, 2015 [ Facility News ]       
The first order of business at the January inaugural meeting of the newly established ARM User Executive Committee was to elect Dave Turner, NOAA/National Severe Storms Laboratory, as chair and Larry Berg, Pacific Northwest National Laboratory, as co-chair. These are 2-year terms with co-chair succeeding to chair at the conclusion of the first term. In [...]

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Columbia University Seeking Postdoctoral Research Scientist
Feb 27, 2015 [ Employment Opportunities ]       
Columbia University invites applications for a postdoctoral research scientist position in the area of modeling radiative processes. The successful candidate will participate in a groundbreaking NASA research initiative, the Nexus for Exoplanet System Science (NEXSS), with an interdisciplinary team of scientists from the Goddard Institute for Space Studies (GISS), the Goddard Space Flight Center, Columbia [...]

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Darwin Site Operations Come to an End
Feb 25, 2015 [ Facility News ]       
The third Tropical Western Pacific (TWP) site for the ARM Climate Research Facility was established in 2002 in Darwin, Australia. After twelve and a half years of collecting data, the site closed on December 31, 2014. Data from Darwin were particularly of interest because of its three distinctive climate patterns: A dry continental regime from about [...]

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Nature Article: Carbon Dioxide’s Greenhouse Effect at Earth’s Surface Confirmed Using ARM Data
Feb 25, 2015 [ Facility News, Feature Stories and Releases ]       
Scientists have for the first time observed an increase in carbon dioxide’s greenhouse effect at the Earth’s surface. The research, conducted using data and data products from the Atmospheric Radiation Measurement (ARM) Climate Research Facility, is reported Wednesday, February 25, in the advance online publication of the journal Nature.

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Even at High Humidity, Aerosols Stick Around: Slowly Evaporating Particles Refute Assumption
Feb 23, 2015 [ Research Highlights ]       
Ubiquitous carbon-rich aerosol particles created by emissions from cars, trees, and other sources alter our climate and affect air quality. Until recently, the properties of these aerosols were hard to experimentally characterize, forcing computational models to rely on unsupported assumptions. For several years, scientists at Pacific Northwest National Laboratory (PNNL) have chipped away at these [...]

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Tall Clouds from Tiny Raindrops Grow
Feb 18, 2015 [ Research Highlights ]       
Big clouds get bigger and small clouds shrink may seem like a simple statement, but the myriad mechanisms behind how clouds are born, grow, and die are surprisingly complex. These very mechanisms may be key to understanding future weather patterns and global climate change. In a study published in the Journal of Geophysical Research: Atmospheres, [...]

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First ARM Summer Training to be Held in Oklahoma
Feb 11, 2015 [ Events, Facility News ]       
In an effort to promote the training of the next generation of atmospheric scientists, the first ever ARM Summer Training on observations and modeling of aerosol, clouds, and precipitation will take place this summer July 13-24, 2015. Sponsored by the Atmospheric Radiation Measurement (ARM) Climate Research Facility, this training will cater to graduate and postdoctoral [...]

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Modeling Dust as Component Minerals in the Community Atmosphere Model
Feb 11, 2015 [ Research Highlights ]       
Desert dust affects Earth’s radiation balance, cloud formation and biogeochemical trace nutrient cycling. Including mineralogy of dust in climate models is important to understand these effects. Researchers, including a Department of Energy scientist at Pacific Northwest National Laboratory, found that ability to correctly include the mineralogy of dust in climate models is hindered by its [...]

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Keeping the Data Flowing
Feb 09, 2015 [ Facility News ]       
Experiences with merging of Archive and DMF systems and data flow In late 2013, the ARM Data Center at Oak Ridge National Laboratory (ORNL) procured "next generation" computer hardware to support the ARM Facility. This consolidation of hardware enables interchangeability of devices and capacity between processes of the Data Management Facility (DMF) and ARM Data Archive—also [...]

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A Novel Approach for Introducing 3D Cloud Spatial Structure Into 1D Radiative Transfer
Feb 06, 2015 [ Research Highlights ]       
Subgrid-scale variability is one of the main reasons why parameterizations are needed in large-scale models. Similarly, subpixel-scale cloud heterogeneity also plagues satellite retrievals of cloud and aerosol properties. Cloud heterogeneity, to some extent, can be represented by the so-called Independent Column Appoximation, i.e., the gridbox or pixel can be divided into many non-interactive subcolumns and [...]

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Long-Term Measurements of Submicrometer Aerosol Chemistry at SGP Using an ACSM
Feb 05, 2015 [ Research Highlights ]       
Aerosols are one of the greatest sources of uncertainty in radiative forcing climate model predictions. Co-located measurements of meteorology, radiation, and aerosols are needed to evaluate and improve treatments of aerosol processes in climate models. Measurements characterizing the chemical and physical properties of aerosols are particularly important for understanding sources and processes of aerosols in [...]

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North Slope Megasite Preparations Take Form
Feb 03, 2015 [ Facility News, Feature Stories and Releases ]       
This fall, the installation of the third ARM Mobile Facility was completed at Oliktok Point, Alaska, with the addition of scanning and vertical-pointing radars, as well as a Raman lidar. With 4 years remaining as planned in the extended deployment at Oliktok, the first year of data collections was completed on September 30, 2014.

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A New Approach for Representing Ice Particles in Weather and Climate Model
Feb 02, 2015 [ Research Highlights ]       
Proper representation of cloud microphysical and precipitation processes is critical for the simulation of weather and climate. Despite decades of advancement, the representation of cloud and precipitation particles in weather and climate models still has many uncertainties. This is due to an incomplete understanding of the important physical processes as well as the inherent complexity [...]

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Multiday Production of SOA in Urban and Forest Outflow
Jan 30, 2015 [ Research Highlights ]       
Secondary organic aerosol (SOA) production in urban and biogenic outflow was investigated using the explicit gas-phase chemical mechanism generator GECKO-A (Lee-Taylor et al. 2015). Urban outflow simulations show several-fold increases in SOA mass continuing for multiple days, whereas forest outflow simulations showed only modest SOA mass increases, and no long-term growth. The multiday SOA production [...]

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Finding the Causes for Consistently Low Biased Stratiform Rainfall in Models
Jan 29, 2015 [ Research Highlights ]       
The amount of convective relative to stratiform rainfall in a mesoscale convective system is important because it significantly impacts the distribution of heating and moistening. This study, the second of a two-part study, compares output from ten cloud-resolving model (CRM) and four limited area model (LAM) simulations of active monsoonal tropical convection during the Tropical [...]

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Overly Intense Convective Updrafts Exposed as a Significant Contributor to Model Biases
Jan 29, 2015 [ Research Highlights ]       
Mesoscale simulations run at cloud-resolving scales often fail to reproduce observed cloud and precipitation structures of convective systems and their dependence on large-scale environmental conditions. This is an important issue because these types of simulations are increasingly used in satellite retrievals and improving representation of convective systems in general circulation models. In this first of [...]

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Sensitivity of Arctic Mixed-Phase Stratocumulus to Surface-Layer and Cloud-Top Moisture Sources
Jan 09, 2015 [ Research Highlights ]       
Arctic mixed-phase stratocumulus cloud systems (AMPS) play an important role in determining the structure of the Arctic atmospheric boundary layer and magnitudes of surface energy budget terms, due to the presence of radiatively important supercooled cloud liquid water. AMPS occur in significantly different environments than subtropical stratocumuli. For example, AMPS are observed above both stable [...]

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