PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
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http://www.jpl.nasa.gov

Contact: Mary A. Hardin

FOR IMMEDIATE RELEASEOctober 3, 1996

FIRST WIND DATA FROM SCATTEROMETER CAPTURES PACIFIC TYPHOONS


       The first images of winds over the oceans taken by the NASA Scatterometer (NSCAT) science instrument onboard Japan's Advanced Earth Observing Satellite (ADEOS) show two typhoons in the northwest Pacific Ocean as they were seen on September 20.

       Typhoon Violet eventually ran into the coast of Japan, killing several people and causing severe property damage. Typhoon Tom was observed in the open ocean east of Japan. The scatterometer measured winds in the storms at about 90 kilometers per hour (60 miles per hour).

       "We are very pleased with the quality of these first images," said Jim Graf, NSCAT project manager at NASA's Jet Propulsion Laboratory. "These images are typical of the operational data that will be generated using NSCAT and then made available to meteorologists all over the world. NSCAT will provide regular measurements of ocean surface wind speeds from space, which will enhance the ability of weather forecasters to predict the behavior of storms such as Typhoon Violet. In addition, Earth science researchers will use NSCAT data to better understand climate changes occurring on our planet."

       The scatterometer takes 190,000 wind measurements per day, mapping more than 90 percent of the world's ice-free oceans every two days. The instrument will provide more than 100 times the amount of ocean wind information currently available from ship reports. Because the scatterometer is a radar instrument, it is capable of taking data day or night, regardless of sunlight or weather conditions.

       "This preliminary analysis of the first set of NSCAT data clearly demonstrates that the high resolution of the NSCAT instrument improves the monitoring of severe storms, such as typhoons. It also shows that the repeated global coverage provides a better description of atmospheric circulation over the ocean, which has not been adequately sampled in the past, and it contributes to a better understanding of air-sea interactions," said Dr. W. Timothy Liu, NSCAT project scientist at JPL.

       Information gathered by the scatterometer is being used by the National Weather Service, an office of the National Oceanic and Atmospheric Administration (NOAA), and the Japanese Meteorological Agency. NOAA processes the data from the scatterometer and distributes related products to researchers around the globe. The ocean surface wind measurements, used in numerical computer models, will help weather forecasters more accurately predict the path and intensity of hurricanes, winter storms and other weather systems that form over the oceans.

       "These 'first look' images are still uncalibrated, but images like these will be routinely available on our World Wide Web site after completion of the calibration validation phase ," Graf explained.

The address for this site is: http://www.jpl.nasa.gov/winds

       ADEOS is an international global change research mission of the National Space Development Agency of Japan (NASDA), which includes instruments from the United States, Japan and France, with investigators from many other countries. The satellite is a key part of an international environmental research effort that includes NASA's Mission to Planet Earth (MTPE) program, a long-term, coordinated research effort to study the Earth as a global environmental system. The goal of MTPE is to develop a better scientific understanding of natural environmental changes and to distinguish between natural and human-made changes and impacts.

       MTPE-related data, which NASA distributes to researchers worldwide, is essential to helping people make better informed decisions about the environment. NSCAT data will be distributed by NASA and NASDA.

       The Jet Propulsion Laboratory developed, built and manages the NSCAT instrument for NASA's Office of Mission to Planet Earth.

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NOTE: A NASA Television Video File will feature animation of the scatterometer wind data showing typhoons Violet and Tom and an interview with Project Manager Jim Graf on Thursday, October 3 at 9 a.m., Noon, 3 p.m., 6 p.m. and 9 p.m. Pacific Time. NASA Television is carried on Spacenet 2, transponder 5 (channel 9) C-Band, at 69 degrees west longitude. The frequency is 3880 MHz. Polarization is horizontal and audio is monaural at 6.8 MHz.