In a series of eight papers published between 2008 and 2009 in the Journal of Geophysical Research-Atmospheres, an international team of researchers funded by the ARM Program, the National Aeronautics and Space Administration, and the United Kingdom’s Natural Environmental Research Council have significantly advanced scientific understanding of the climate system in the sensitive sub-Saharan, or [...]

Common experience is that if the temperature is lower than 0°C, then water will be in the form of ice instead of liquid. However, this is not true for the atmosphere, because many clouds with temperatures less than 0°C have super-cooled liquid in them. If these clouds also contain ice, they are called mixed-phase clouds. [...]

Marine boundary layer (MBL) clouds can regulate significantly the sensitivity of climate models, yet currently they are simulated poorly. This study aims to characterize the seasonal variations of physical properties of these clouds and their associated processes by using measurements from the Atmospheric Radiation Measurement (ARM) mobile facility (AMF) at Point Reyes, reanalysis products, [...]

Squall lines with trailing stratiform precipitation are common in both the mid-latitudes and tropics. These systems produce copious amounts of precipitation and occasionally severe weather. Because of their extensive size and frequent occurrence they are also important in redistributing energy in the atmosphere via convective and mesoscale transport and latent heating/cooling. However, their structure and [...]

Brookhaven National Laboratory (BNL) is currently seeking candidates to fill a senior applications analyst position as part of a new concerted effort for theoretical understanding, development, and evaluation of parameterizations of the fast physics processes in global climate models. This new effort is jointly supported by the DOE Climate Change Prediction Program (CCPP), Atmospheric Radiation [...]

The College of Agricultural and Environmental Sciences at the University of Georgia is currently seeking candidates to fill a postdoctoral research associate position. These observations are used for agricultural and environmental applications. Efforts are also underway to incorporate a weather prediction component based on the Weather Research and Forecasting (WRF) model for the agricultural [...]

On June 30, officials from the Regional Government of the Azores recognized the deployment of the ARM Mobile Facility on Graciosa Island during an official opening ceremony held at the site. Notable among the participants was Carlos César, President of the Regional Government of the Azores, and several other government officials. Media outlets for [...]

In 2006, the ARM Mobile Facility was deployed to Niamey, Africa, for the RADAGAST campaign as part of the ongoing African Monsoon Multidisciplinary Analysis (AMMA) study. To further the data analyses from this deployment and identify additional areas for future study, researchers from the University of Niamey are now teaming with the site scientist team [...]

Ice storms and tornadoes were not enough to stop a team from the Pacific Northwest National Laboratory who traveled to Oklahoma in January to begin an aircraft field study on thin clouds. The researchers are gathering direct measurements from thin, low-lying clouds as part of a field campaign from January to June 2009 that will [...]

A mathematical tweak dramatically improves air pollution detection on cloudy days. Scientists at Pacific Northwest National Laboratory have devised a way to reduce cloud-induced glare by as much as ten-fold in some cases when satellites measure atmospheric pollution on cloudy days. Satellites monitor the pollution level in the atmosphere by measuring the amount of [...]

An 80-person team of U.S. and Canadian scientists flew over the North Slope of Alaska in an intensive month-long field study in April. The group's mission was to measure and detail key elements of the atmosphere to help reveal how the Earth's climate is changing. The Arctic region is an ideal study location because it [...]

Arctic mixed-phase clouds are complex because they consist of both ice and water. Although these clouds play an important role in Arctic climate change and the energy balance, they have not been understood well and are not well represented in current climate models. Understanding how mixed-phase clouds form and what affects their lifetime [...]

The 13th Annual Conference on Cloud Physics, sponsored by the American Meteorological Society and organized by the AMS Committee on Cloud Physics, will be held June 28 - July 2, 2010 jointly with the 13th Annual Conference on Atmospheric Radiation at the Doubletree Hotel Portland-Lloyd Center in Portland, Oregon. Announcements for both the Cloud Physics and [...]

In the first long term aircraft campaign of its kind, the RACORO field campaign wrapped up flight operations on June 30. Guided by a seven-member science steering committee, the team logged 259 research hours from the skies above Oklahoma. The five-month campaign obtained a statistical data set of cloud, aerosol, radiative, and atmospheric state measurements.

The vast majority of global geoscience aircraft are operated by the agencies within the Interagency Coordinating Committee for Airborne Geosciences Research and Applications (ICCAGRA) and the European Fleet for Airborne Research (EUFAR). In May, the first joint meeting between these two entities was held in Stresa, Italy, to reach an understanding of how each group [...]

The Atmospheric Sciences and Global Change Division at Pacific Northwest National Laboratory seeks a radar engineer to assist in the maintenance and application of a global radar network in support of the ARM Climate Research Facility (ACRF). The successful candidate will perform analysis of radar data to assess the operational status of radars in the [...]

The ARM Climate Research Facility (ACRF) group at Argonne National Laboratory seeks an atmospheric remote sensing engineer—a radar data products expert—with proven experience in atmospheric radar systems. This position involves (1) developing algorithms to improve climate model representations of clouds and their microphysical properties; (2) formulating innovative approaches for using radar instrumentation and data collected [...]

The Atmospheric Science Division at Brookhaven National Laboratory invites applications for a postdoctoral research associate. This position will focus on the analysis of in situ airborne measurements and remote sensing data and the study of microphysics and dynamics in marine stratocumulus and the influence of aerosols on those clouds. The successful candidate will hold a PhD [...]

The Department of Geography and Geology at Western Kentucky University is seeking applicants for a working graduate student (M.S.) position on a NASA-funded project. The project entails studying climate downscaling of selected IPCC AR4 simulations and projections for high-resolution regional applications in regional climate analysis, land-surface modeling, and ultimately forest and ecosystem modeling in [...]

A postdoctoral position in computer sciences/atmospheric remote sensing is available at the Jet Propulsion Laboratory (JPL). This position will contribute to the development of the Instrument Simulator Suite for Atmospheric Remote Sensing (ISSARS), a new project funded by NASA’s Earth Science Technology Office led by JPL in collaboration with NASA Langley Research Center, NASA [...]

The Department of Meteorology at Pennsylvania State University has an immediate opening for a numerical modeler on an ARM-funded team examining the interactions between Arctic clouds, aerosol, and Arctic climate. The Penn State team is currently conducting research on two ARM-funded Arctic field experiments: The Mixed-Phase Arctic Clouds Experiment (MPACE) and the Indirect and Semi-Direct Aerosol [...]

Several ARM science team members are quoted in an article published in ClimateWire, an online publication devoted to climate change issues and their effects on business, the environment, and society. The article highlights deployments of the ARM Mobile Facility and its contribution to the overall climate record obtained through the ARM Climate Research Facility. [...]

Reflecting on the ARM Program’s 20-year anniversary, a few of the early leaders of the program describe the beginnings of this effort and how it evolved to become a major contributor to national and international research efforts related to global climate change.

The increase in anthropogenic CO2 explains about half of the observed warming over the past 150 years and cannot satisfactorily explain the geographic variation in the warming. Of all the key uncertainties on climate forcing, the indirect effect of aerosols on clouds and radiation ranks at the top (IPCC 2007). Ice nuclei (IN), a class [...]

Severe thunderstorms tend to grab headlines due to the chaos they can cause, but from an environmental standpoint they represent a basic contribution to the water supply. This is especially true in the central United States where they occur most frequently. As Earth’s climate changes, researchers question the degree to which severe thunderstorms and tornadoes—and [...]

Climate Change at the Eve of the Second Decade of the Century. To commemorate 130 years of the birth of Milutin Milankovitch, founder of the mathematical approach to the study of climate change, Serbian Academy of Sciences and Arts (SASA) is organizing an international symposium, in Belgrade, 22-25 September 2009. The rapid global climate change in progress [...]

Clouds come in a variety of shapes and sizes, and each type contributes differently to the climate system. While low-level water clouds tend to have a cooling effect on the atmosphere, high-level cirrus clouds that are composed of ice can have the opposite effect. Located in the upper layer of Earth's atmosphere--the troposphere--these icy clouds [...]

Joint Fall Meetings of the CM and Aerosol Working Groups in Boulder, Colorado. The CM meeting will be held the first three days and the AWG meeting will be held the last day. POC: Ann Fridlind, NASA Goddard Institute for Space Studies (fridlind@nasa.gov)

Fall meeting of the Cloud Properties/Radiative Processes Working Groups in Boulder, Colorado. POC: Adrienne DeBoard, Brookhaven National Laboratory