Life in the Clouds
Researchers found surprising evidence of sea salt and frozen plankton in high, cold, cirrus clouds, the remnants of Hurricane Nora, over the U.S. plains states. Although the 1997 hurricane was a strong eastern Pacific storm, her high ice-crystal clouds extended many miles inland, carrying ocean phenomena deep into the U.S. heartland.
|This is a photograph of one of the spectacular halos created by the ice crystal clouds in Hurricane Nora’s outer bands. It was taken in Salt Lake City, Utah, on September 25, 1997. |
Credit: Gerald (Jay) Mace, University of Utah.
Kenneth Sassen of the University of Utah, Salt Lake City, and University of Alaska Fairbanks; W. Patrick Arnott of the Desert Research Institute (DRI) in Reno, Nev.; and David O. Starr of NASA’s Goddard Space Flight Center, Greenbelt, Md., co-authored a paper about Hurricane Nora’s far-reaching effects. The paper was published in the April 1, 2003, issue of the American Meteorological Society’s Journal of Atmospheric Sciences.
Scientists were surprised to find what appeared to be frozen plankton in some cirrus crystals collected by research aircraft over Oklahoma, far from the Pacific Ocean.
This was the first time examples of microscopic marine life, like plankton, were seen as "nuclei" of ice crystals in the cirrus clouds of a hurricane.
Nora formed off the Panama coast, strengthened as it traveled up the Baja Peninsula, and the hurricane crossed into California in September 1997. Over the western U.S., Nora deposited a stream of high cirrus, ice crystal, clouds that created spectacular optical effects, such as arcs and halos, above a broad region including Utah and Oklahoma. That stream of cirrus clouds enabled researchers to analyze growth of ice crystals from different nuclei.
|These ice crystals in the shapes of plates and columns show central features resembling plankton and other microbes ranging from a few microns up to 40 microns in maximum dimension. A micron is one-millionth of a meter, or about 40 millionths of an inch. Note the apparent algae cell at the center of the broken plate crystal (top right), which displays features of cell morphology.|
Credit: Desert Research Institute
Different nuclei, like sulfate particles, sea salt and desert dust, affect ice-crystal growth and shape. Torn from the sea surface by strong hurricane winds, sea salt and other particles from evaporated sea spray are carried to the cold upper troposphere in storm updrafts, where the drops freeze and become ice crystals.
Plankton, a microscopic organism, is also likely present in the sea spray and is similarly lofted to high levels.
"Understanding how ice crystals grow and what determines their shapes is important in understanding how they interact with sunlight and infrared energy," Starr noted. "These interactions are important processes in the global climate system. They are also critical to sensing cloud properties from space, where NASA uses measurements of the reflected solar radiation to infer cloud physical properties, such as ice-crystal size," he said.
Data were gathered using ground-based remote sensors at the Facility for Atmospheric Remote Sensing in Salt Lake City and at the Clouds and Radiation Testbed in northern Oklahoma. A research aircraft collected particle samples over Oklahoma. Observations from the Geostationary Operational Environmental Satellite 9 (West), launched by NASA and operated by the National Oceanic and Atmospheric Administration, were also used. DRI analyzed the ice crystals collected from Nora.
Scientists were using data generated through the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Program.
The ARM energy measurements also double-check data from the Moderate Imaging Spectroradiometer instrument aboard NASA’s Terra and Aqua satellites. By ensuring the satellites are recording the same energy reflected and absorbed by clouds from Hurricane Nora as those provided by the ground data in this study, scientists hope to take fewer ground measurements in the future, and enable the satellites to provide the data.
The ARM Program’s purpose is obtaining field measurements and developing computer models of the atmosphere. Researchers hope to better understand the processes that control the transfer of solar and thermal infrared energy in the atmosphere, especially in clouds, and at the Earth’s surface.
For astrobiology, a number of proposals have stretched the limits of terrestrial life to cloud tops. Carl Sagan, et al., looked at the presence of cloud colonies at elevation on gas giants like Jupiter. More recently proposals have looked at cloud cover on Venus, as having a possible temperate zone that could help elucidate strange ultraviolet absorption on Earth’s sister planet.
The DOE ARM program, National Science Foundation, and NASA‘s Earth Science Enterprise funded this research. The Earth Science Enterprise is dedicated to understanding the Earth as an integrated system and applying Earth System Science to improve prediction of climate, weather and natural hazards, such as hurricanes, using the unique vantage point of space.