Global Precipitation Measurement (GPM) is a joint satellite mission between JAXA and

NASA The National Aeronautics and Space Administration (NASA ) is an independent agencies of the United States government, independent agency of the federal government of the United States, US federal government responsible for the United States ...

as well as other international space agencies to make frequent (every 2–3 hours) observations of Earth's

precipitation In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls from clouds due to gravitational pull. The main forms of precipitation include drizzle, rain, rain and snow mixed ("sleet" in Commonwe ...

from orbit. It is part of NASA's Earth Systematic Missions program and works with a

satellite constellation A satellite constellation is a group of artificial satellites working together as a system. Unlike a single satellite, a constellation can provide permanent global or near-global pass (spaceflight), coverage, such that at any time everywhere on E ...

to provide full global coverage. The project provides global precipitation maps to assist researchers in improving the forecasting of extreme events, studying global climate, and adding to current capabilities for using such satellite data to benefit society. GPM builds on the notable successes of the Tropical Rainfall Measuring Mission (TRMM), which was also a joint NASA-JAXA activity. The project is managed by NASA's Goddard Space Flight Center, and consists of a GPM Core Observatory satellite assisted by a constellation of spacecraft from other agencies and missions. The Core Observatory satellite measures the two and three dimensional structure of Earth's precipitation patterns and provides a new calibration standard for the rest of the satellite constellation. The GPM Core Observatory was assembled and tested at Goddard Space Flight Center, and launched from Tanegashima Space Center, Japan, on a

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H-IIA rocket. The launch occurred on February 28, 2014, at 3:37 am JST on the first attempt. Agencies in the United States, Japan, India and France (together with Eumetsat) operate the remaining satellites in the constellation for agency-specific goals, but also cooperatively provide data for GPM. __TOC__

Science objectives

GPM has five broad science objectives: * advance precipitation measurement from space * improve knowledge of precipitation systems, water-cycle variability and freshwater availability * improve climate modeling and prediction * improve weather forecasting and climate reanalysis * improve hydrological modeling and prediction

Main instruments

Dual-Frequency Precipitation Radar (DPR)

The DPR is a spaceborne radar, providing three-dimensional maps of storm structure across its swath, including the intensity of rainfall and snowfall at the surface. The DPR has two frequencies, allowing researchers to estimate the sizes of precipitation particles and detect a wider range of precipitation rates. The Ku-band radar, similar to the PR on TRMM, covers a 245 km (152 mile) swath. Nested inside that, the Ka-band radar covers a 120 km (74.5 mile) swath. Data from the DPR is sent to the ground via a single-access link with TDRSS relay satellites."Global Precipitation Measurement Mission Core Observatory"
''NASA Goddard Space Flight Center.'' Retrieved: 6 March 2018.

GPM Microwave Imager (GMI)

The GMI is a passive sensor that observes the microwave energy emitted by the Earth and atmosphere at 13 different frequency/polarization channels. These data allow quantitative maps of precipitation across a swath that is 885 km (550 miles) wide. This instrument continues the legacy of TRMM microwave observations, while adding four additional channels, better resolution, and more reliable calibration. Data from the GMI is continuously sent to the ground via a multiple-access link with TDRSS relay satellites.

Precipitation data sets

GPM produces and distributes a wide variety of precipitation data products. Processing takes place at the Precipitation Processing System (PPS) at NASA Goddard Space Flight Center, as well as at the JAXA facility in Japan. Data is provided at multiple "levels" of processing, from raw satellite measurements to best-estimate global precipitation maps using combinations of all the constellation observations and other meteorological data. All data from the mission is made freely available to the public on NASA websites. Precipitation data is made available in a variety of formats, spatial and temporal resolutions, and processing levels which are accessible on the Precipitation Measurement Missions "Data Access" webpage. Several data visualization and analysis tools have been made available to provide easy access for the science and applications communities, which include the in-browser Earth science data analysis tool Giovanni, a web API, and a 3D near-realtime global precipitation viewer. GPM testing

Social media and outreach

In addition to maintaining social media accounts and the GPM Road to Launch Blog, JAXA and

developed several outreach activities specific to this mission prior to launch that the public could participate in. After launch a series of featured articles and videos were produced to highlight various scientific goals and discoveries of the mission, and an "Extreme Weather" blog is maintained to provide timely updates about the latest extreme precipitation events and natural disasters occurring around the world. A Precipitation Education website is also maintained to provide teachers and students with lesson plans, animations, and other resources to teach about the

water cycle The water cycle (or hydrologic cycle or hydrological cycle) is a biogeochemical cycle that involves the continuous movement of water on, above and below the surface of the Earth across different reservoirs. The mass of water on Earth remains fai ...

, Earth science, and the GPM mission. * NASA Socials **JAXA-NASA DC Cherry Blossom Event ***April 12, 2013, at NASA's Goddard Space Flight Center in Greenbelt, Maryland **GPM Media Day ***Friday, Nov. 15, 2013, at NASA's Goddard Space Flight Center in Greenbelt, MD ***Social media users were invited to apply for credentials to attend the media day activities and share their experiences via their own accounts. * Photo Contests **Extreme Weather **Let it Snow **Unique Perspectives *GPM Anime Challenge

In popular culture

The main character Mohan Bharghav ( Shahrukh Khan) in 2004 Indian film '' Swades: We, the People'' is a Project Manager in NASA's GPM project. The movie starts with a press conference pertaining to NASA's GPM, and its upcoming launch. Bharghav discuss the importance of GPM and its positive impact on Earth. In the movie the GPM satellite is launched by the

Space Shuttle The Space Shuttle is a retired, partially reusable launch system, reusable low Earth orbital spacecraft system operated from 1981 to 2011 by the U.S. National Aeronautics and Space Administration (NASA) as part of the Space Shuttle program. ...

. A short anime film of 6 minutes, ''Dual frequency Precipitation Radar Special Movie'', was produced by JAXA and White Fox in 2013.DPR Dual-frequency Precipitation Radar Special Movie / DPRスペシャルムービー
Sky-Animes

References

External links

* (NASA) *

* (JAXA) *
Global Precipitation Measurement/ Dual-frequency Precipitation Radar pamphlet
*
GPM videos

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