Assessment of the Benefits of Extending the Tropical by National Research Council, Division on Earth and Life

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By National Research Council, Division on Earth and Life Studies, Board on Atmospheric Sciences and Climate, Committee on the Future of the Tropical Rainfall Measuring Mission

Launched together in 1997 through the nationwide Aeronautics and house management (NASA) and the Japan Aerospace Exploration organisation (JAXA), the Tropical Rainfall Measuring venture (TRMM) is a satellite tv for pc challenge that positioned a special suite of tools, together with the 1st precipitation radar, in house. those tools are used to watch and expect tropical cyclone tracks and depth, estimate rainfall, and visual display unit weather variability (precipitation and sea floor temperature). TRMM has been accumulating info for seven years; this information is utilized by the Joint storm caution middle, the nationwide middle for Environmental Prediction, and the nationwide storm heart, between others around the globe. In July 2004, NASA introduced that it'll terminate TRMM in August 2004. on the request of the nationwide Oceanic and Atmospheric management (NOAA), the White residence, and the technology group, NASA agreed to proceed TRMM operations throughout the finish of 2004. in the meantime, NASA requested a countrywide examine Council (NRC) committee to supply recommendation at the merits of protecting TRMM in operation past 2004. After conserving a workshop with a few specialists within the box, the committee came upon that TRMM will give a contribution considerably to operations and technological know-how if the undertaking is prolonged; and as a result, strongly recommends persevered operation of TRMM with the caveat that rate and possibility might want to be extra tested sooner than a last choice concerning the way forward for TRMM may be made.

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Extra info for Assessment of the Benefits of Extending the Tropical Rainfall Measuring Mission: A Perspective from the Research and Operations Communities: Interim Report

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ANTICIPATED CONTRIBUTIONS WHEN CONTROLLED REENTRY IS STILL POSSIBLE Anticipated Operational Contributions Another Year of PR and TMI Data for Tropical Storm Monitoring and Forecasting Another year’s worth of TMI and PR data would be valuable to the National Oceanic and Atmospheric Administration (NOAA) and recipients of its forecasts for the same reasons expressed by Vice Admiral Lautenbacher to Dr. Sean O’Keefe in 2004 (see Appendix H). Similarly, Department of Defense agencies, other agencies around the world (refer to Chapter 3), and their users will continue to benefit from the data.

The broader context of benefits and risks associated with TRMM extension was discussed at a 2001 NASA-supported workshop (Box 2-2). 10 8Robert Adler, NASA, at the November 8 workshop. 14 Guidelines and Assessment Procedures for Limiting Orbital Debris referenced by Jack Kaye, NASA, at the November 8 workshop. , in his presentation at the November 8 workshop. Jan-01 0 100 200 300 400 500 Jan-02 Jan-03 Jan-04 Orbit raised from 350 km. to 402 km. Jan-05 Jan-07 Date (Mon-YY) Jan-06 Jan-08 Jan-09 Jan-10 Jan-11 No August 2001 Boost Jan-12 Jan-13 138 kg.

The horizontal line marked “138 kg” indicates the critical fuel level below which reentry cannot be controlled. When the fuel level reaches zero, the ability to make orbital adjustments is lost, the TRMM data stream degrades, and driftdown begins. The extension of the lifetime of TRMM due to the orbital boost in 2001 is evident from the difference between the original projected zero fuel point in 2003 and the various options in 2010-2011. The three curves that intercept the horizontal axis in 2010-2011 are for three different solar flux forecast scenarios: (1) mean expected flux and nominal phase of the solar cycle (the line with the latest intercept on the X-axis); (2) sigma plus flux and late phase (the line intercepting near January 2011); and (3) 2 sigma plus flux and early phase (the line intercepting near January 2010).

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