Scientists Study Desert Air To Understand Weather And Climate

The United Arab Emirates Unified Aerosol Experiment mission runs from August 5 through September 30. Scientists are using satellites, computer models and ground stations to understand the unique "mixing bowl" of desert dust, smoke and other aerosols created by the complex atmospheric circulations.

"Man-made emissions, smoke from the Indian subcontinent and desert dust combine in the air to make a unique aerosol laboratory," said Hal Maring of NASA Headquarters, Washington.

"We have the most intensely monitored remote-sensing aerosol network ever assembled, including two radiation and aerosol super sites, 10 satellite instruments, six computer models, a research aircraft and a research vessel," said Jeff Reid, mission scientist from the Naval Research Laboratory in Monterey, Calif. "There are 70 scientists participating, 40 of them working in the field, from over a dozen institutions, including the large South African and Colorado-based National Center for Atmospheric Research weather modification teams," he added.

Aerosols have always been an interesting puzzle piece in learning how climate works. Lighter aerosols reflect heat and sunlight and have cooling properties. Darker aerosols absorb heat and light, warming the atmosphere. This mission will measure aerosol properties, where aerosols move, and whether they add or remove warmth. Scientists also hope to model and explain complicated weather patterns in the coastal regions of the Arabian Gulf and the Gulf of Oman.

By obtaining more accurate data about aerosols and their behavior, scientists will improve computer climate models and predictions of climate behavior in response to changes in aerosol concentrations. To accomplish this task, NASA will start from space, using primarily its Terra and Aqua satellites, but other satellites as well. Aboard Terra, the multiangle imaging spectroradiometer instrument, built and managed by NASA's Jet Propulsion Laboratory, Pasadena, Calif., will provide an independent measure of aerosol size and concentration, as well as altitude in some cases. That instrument observes aerosols over both land and ocean.

These satellite data will be compared to ground-based remote sensing measurements of mineral dust and pollutant aerosols gathered by 15 Aerosol Robotic Network instruments over land and water, the Naval Research Laboratory’s Mobile Atmospheric Aerosol and Radiation Characterization Observatory and NASA's Surface-sensing Measurements for Atmospheric Radiative Transfer.

Navy researchers will use the aircraft, the Naval Research Laboratory observatory and satellite data to evaluate the Navy's global and regional weather and aerosol-transport computer models. The Arabian Gulf region presents a challenge to meteorologists trying to simulate weather with computer models because sea-surface and land temperatures vary to extremes and the topography varies dramatically. There are also strong small to medium-sized weather changes ranging from one storm cloud to a large cluster of thunderstorms the size of Connecticut.

Using the Naval Research Laboratory observatory, scientists from the Scripps Institution of Oceanography and Poland's Warsaw University will study the impact of aerosols and clouds on incoming solar radiation and the hydrologic cycle and energy balance in this mostly rain-free area.

"This project will complement Scripps' effort to understand climate change in this region of the world," said Piotr Flatau, a research scientist at Scripps, who will be working with Krzysztof Markowicz and others from Warsaw University during the project. "I know the Arabian Sea from research cruises during the Indian Ocean Experiment, but this mission brings a new set of challenges. While the Indian Ocean Experiment took place in a mostly monsoonal region, the United Arab Emirates is dry and hot. The temperatures are reaching 40 degrees Celsius (104 degrees Fahrenheit) there right now and we do not expect much rain," Flatau said.

"The United Arab Emirates Office of His Highness the President, Department of Water Resource Studies, is providing extensive logistical support, including access to five weather radars and 50 surface stations," said Lt. Col. Mangoosh, Office of the President of the United Arab Emirates.

For more information and images on the Internet, visit:http://www.gsfc.nasa.gov/topstory/2004/0818uae2.html ; http://uae2.gsfc.nasa.gov/ ; and http://www-misr.jpl.nasa.gov/ .