First Images from NASA-JAXA GPM Satellite

On March 10, the Core Observatory passed over an extra-tropical cyclone about 1055 miles (1700 kilometers) due east of Japan's Honshu Island. Satellite data shows the full range of precipitation in the storm.

Image Credit: NASA's Goddard Space Flight Center

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NASA and the Japan Aerospace Exploration Agency (JAXA) have released the first images captured by their newest Earth-observing satellite, the Global Precipitation Measurement (GPM) Core Observatory, which launched into space Feb. 27.

The images show precipitation falling inside a March 10 cyclone over the northwest Pacific Ocean, approximately 1,000 miles east of Japan. The data were collected by the GPM Core Observatory's two instruments: JAXA's Dual-frequency Precipitation Radar (DPR), which imaged a three-dimensional cross-section of the storm; and, NASA's GPM Microwave Imager (GMI), which observed precipitation across a broad swath.

"It was really exciting to see this high-quality GPM data for the first time," said GPM project scientist Gail Skofronick-Jackson at NASA's Goddard Spaceflight Center in Greenbelt, Md. "I knew we had entered a new era in measuring precipitation from space. We now can measure global precipitation of all types, from light drizzle to heavy downpours to falling snow."

The satellite's capabilities are apparent in the first images of the cyclone. Cyclones such as the one imaged -- an extra-tropical cyclone -- occur when masses of warm air collide with masses of cold air north or south of the tropics. These storm systems can produce rain, snow, ice, high winds, and other severe weather. In these first images, the warm front ahead of the cyclone shows a broad area of precipitation -- in this case, rain -- with a narrower band of precipitation associated with the cold front trailing to the southwest. Snow is seen falling in the northern reaches of the storm.

The GMI instrument has 13 channels that measure natural energy radiated by Earth's surface and also by precipitation itself. Liquid raindrops and ice particles affect the microwave energy differently, so each channel is sensitive to a different precipitation type. With the addition of four new channels, the GPM Core Observatory is the first spacecraft designed to detect light rain and snowfall from space.

In addition to seeing all types of rain, GMI's technological advancements allow the instrument to identify rain structures as small as about 3 to 9 miles (5 to 15 kilometers) across. This higher resolution is a significant improvement over the capability of an earlier instrument flown on the Tropical Rainfall Measurement Mission in 1997.

"You can clearly see them in the GMI data because the resolution is that much better," said Skofronick-Jackson.

The DPR instrument adds another dimension to the observations that puts the data into high relief. The radar sends signals that bounce off the raindrops and snowflakes to reveal the 3D structure of the entire storm. Like GMI, its two frequencies are sensitive to different rain and snow particle sizes. One frequency senses heavy and moderate rain. A new, second radar frequency is sensitive to lighter rainfall and snowfall.

"Both return independent measurements of the size of raindrops or snowflakes and how they are distributed within the weather system," said DPR scientist Bob Meneghini at Goddard. "DPR allows scientists to see at what height different types of rain and snow or a mixture occur -- details that show what is happening inside sometimes complicated storm systems."

The DPR data, combined with data from GMI, also contribute to more accurate rain estimates. Scientists use the data from both instruments to calculate the rain rate, which is how much rain or snow falls to Earth. Rain rate is one of the Core Observatory's essential measurements for understanding where water is on Earth and where it's going.

"All this new information comes together to help us better understand how fresh water moves through Earth's system and contributes to things like floods and droughts," said Skofronick-Jackson.

First images from DPR First data visualization of the three-dimensional structure of precipitation collected by the Dual-frequency Precipitation Radar aboard the Global Precipitation Measurement (GPM) mission's Core Observatory. The image shows rain rates across a vertical cross-section approximately 4.4 miles (7 kilometers) high through an extra-tropical cyclone observed off the coast of Japan on March 10, 2014. The DPR 152-mile (245 kilometers) wide swath is nested within the center of the GPM Microwave Imager's wider observation path. Red areas indicate heavy rainfall while yellow and blue indicate less intense rainfall. 

Image Credit: JAXA / NASA

The GPM Microwave Imager was built by Ball Aerospace & Technologies, Corp., in Boulder, Colo., under contract to NASA. DPR was developed by JAXA with the National Institute of Information and Communication Technology.

These first GPM Core Observatory images were captured during the first few weeks after launch, when mission controllers at the NASA Goddard Mission Operations Center put the spacecraft and its science instruments through their paces to ensure they were healthy and functioning as expected. The engineering team calibrates the sensors, and Goddard's team at the Precipitation Processing System verifies the accuracy of the data.

First images from DPR The Dual-frequency Precipitation Radar observes rainfall and snowfall that occurs within clouds in three dimensions, across the surface of the Earth and upward into the atmosphere. An extra-tropical cyclone was observed over the northwest Pacific Ocean off the coast of Japan on March 10, 2014. 
 
The graph on the left shows the extra-tropical storm seen by the DPR as the satellite passed overhead. The x-axis is the east-west longitude and the y-axis is north-south latitude. The colors show the rain rate at sea-level, with more intense rainfall represented by red and lighter precipitation shown in blue. The line from A to B shows the location of the two cross-sections on the right.
 
The two sections on the right show the side-view of the storm from the surface, up into the atmosphere. This shows scientists the distribution of different precipitation types within the storm in three dimensions. 
 
The colors show the radar reflectivity, the type of data returned by the DPR instrument that is interpreted by scientists analyzing the data and then used to calculate rain rates. The x-axis shows the distance in kilometers from point A in the lefthand graph. The y-axis shows height above the ocean in kilometers. The top image is the Ku-band radar frequency that is more sensitive to heavy and moderate rainfall. The bottom image is the Ka-band radar frequency that is more sensitive to light rain and snow. The most notable feature of these images is where the height of the heavier precipitation dips to the ocean surface at about 240 kilometers on the x-axis. This indicates a transition from rain on the right (reds and yellows) to falling snow on the left (blues and greens).

Image Credit: JAXA / NASA

This initial science data from the GPM Core Observatory will be validated and then released for free by September online at:

http://pps.gsfc.nasa.gov

For more information and the GPM mission, visit:

http://www.nasa.gov/gpm

and

http://www.jaxa.jp/projects/sat/gpm/index_e.html

The GPM Core Observatory was the first of five planned Earth science launches for the agency in 2014. The joint NASA/JAXA mission will study rain and snow around the world, joining with an international network of partner satellites to make global observations every three hours.

NASA monitors Earth's vital signs from land, air and space with a fleet of satellites and ambitious airborne and ground-based observation campaigns. NASA develops new ways to observe and study Earth's interconnected natural systems with long-term data records and computer analysis tools to better see how our planet is changing. The agency shares this unique knowledge with the global community and works with institutions in the United States and around the world that contribute to understanding and protecting our home planet.

For more information about NASA's Earth science activities in 2014, visit:

http://www.nasa.gov/earthrightnow

-end-

 

Steve Cole
Headquarters, Washington     
202-358-0918
stephen.e.cole@nasa.gov

Rani Gran
Goddard Space Flight Center, Greenbelt, Md.
301-286-2483
rani.c.gran@nasa.gov

Takao Akutsu
Japan Aerospace Exploration Agency, Tokyo
+81-50-3362-4374
akutsu.takao@jaxa.jp

First GPM ImagesPrecipitation data collected by the GPM Microwave Imager aboard the Global Precipitation Measurement (GPM) mission's Core Observatory. The image shows rain rates across a 550-mile (885 kilometer) wide swath of an extra-tropical cyclone observed off the coast of Japan on March 10, 2014. Red areas indicate heavy rainfall, while yellow and blue indicate less intense rainfall. In the northwest part of the storm in the upper left of the image, the blue areas indicate falling snow.

GPM First Images from GMI On March 10, the Core Observatory passed over an extra-tropical cyclone about 1055 mi (1700 km) due east of Japan's Honshu Island. The storm formed from the collision of a cold air mass wrapping around a warm air mass, emerging over the ocean near Okinawa on March 8. It moved northeast over the ocean south of Japan, drawing cold air west-to-east over the land, a typical winter weather pattern that also brought heavy snow over Hokkaido, the northernmost of the four main islands. After the GPM images were taken, the storm continued to move eastward, slowly intensifying before weakening in the central North Pacific. 

13 frequencies of the GMI The GPM Microwave Imager (GMI) has a swath 550 miles (885 kilometers) wide, giving it a broad view of the extra-tropical cyclone observed off the coast of Japan on March 10, 2014. The GMI instrument has 13 channels, each displayed in this visualization of the data. Each channel is sensitive to a different frequency of microwave energy naturally emitted from or affected by precipitation. As depicted by the graphics, the five channels on the left are sensitive to heavy and moderate rainfall. The four channels in the center sense precipitation mixtures of both snow and ice within the clouds. The mixed layers are often the result of ice or snow melting into rain as it falls. The four channels on the right are sensitive to light rain and snowfall. Multiple channels in each category ensure that GMI captures as full a range as possible of precipitation types.
 
The data from GMI will be used as a reference standard for an international network of partner satellites that also measure precipitation. The data from the GPM Core Observatory and these partner satellites will be unified into a single global precipitation data set every three hours.

Image Credit: NASA / JAXA