NASA TROPICS Earth Venture Mission: Data Products

The Time-Resolved Observations of Precipitation structure and storm Intensity with a Constellation of Smallsats (TROPICS) mission was selected by NASA as part of the Earth Venture–-Instrument (EVI-3) program. The overarching goal for TROPICS is to provide nearly all-weather observations of 3-D temperature and humidity, as well as cloud ice and precipitation horizontal structure, at high temporal resolution to conduct high-value science investigations of tropical cyclones. TROPICS is providing rapid-refresh microwave measurements (median refresh rate around 60 minutes for the baseline mission) that are being used to observe the thermodynamics of the troposphere and precipitation structure for storm systems at the mesoscale and synoptic scale over almost the entire storm lifecycle. This poster will present the latest information on the TROPICS data products, which includes accessing the data, available documentation, and validation plans. The TROPICS constellation currently comprises four CubeSats in three low-Earth orbital planes. One CubeSat is in a sun-synchronous orbit, two CubeSats are in the same 33° inclination, and the final CubeSat is in a separate 33° inclination. Each CubeSat hosts a high-performance radiometer that provides temperature profile estimates using seven channels near the 118.75-GHz oxygen absorption line, water vapor profile estimates using three channels near the 183-GHz water vapor absorption line, imagery in a single channel near 90 GHz for precipitation measurements (when combined with higher resolution water vapor channels), and a single channel near 205 GHz that is more sensitive to cloud-sized ice particles. This observing system offers an unprecedented combination of horizontal and temporal resolution to measure environmental and inner-core conditions for tropical cyclones on a nearly global scale and is a major leap forward in the temporal resolution of several key parameters needed for assimilation into advanced data assimilation systems capable of utilizing rapid-update radiance or retrieval data. The TROPICS mission produces a range of data products that will be available at the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC). The data products are produced at the TROPICS Data Processing Center (UW-M SSEC), and consist of Level-1 radiances (antenna and brightness temperatures), Level-2a unified resolution radiance, Level-2b Atmospheric Vertical Temperature Profiles (AVTP), Level-2b Atmospheric Vertical Moisture Profiles (AVMP), Level-2b Instantaneous Surface Rain Rate (ISRR), and Level-2b Tropical Cyclone (TC) intensity algorithms to estimate two primary variables: Minimum Sea Level Pressure (MSLP) and Maximum Sustained Winds (MSW). Two independent intensity estimation methods are included: 1) the Tropical Cyclone Intensity Estimate algorithm (TCIE) developed at the University of Wisconsin/CIMSS that uses native microwave brightness temperatures, and 2) the Hurricane Intensity and Structure Algorithm (HISA) developed at Colorado State University/CIRA that uses microwave retrievals of temperature, moisture, and integrated quantities. In addition to MSW and MSLP, HISA also provides estimates of surface wind radii and 2D winds at standard pressure levels. TROPICS adapted the NOAA STAR Microwave Integrated Retrieval System (MIRS) to retrieve the AVTP and AVMP data products. The ISRR uses the Goddard profiling algorithm (GPROF). While the GES DISC data has a nominal 12-hour latency and is granularized into orbit-long netCDF data files, the constellation CubeSats are in near real-time downlink scheduling (< 1 hour), and these low-latency datasets are available upon request. The TROPICS Data Processing Center at the University of Wisconsin – Madison Space Science and Engineering Center distributes L1b NRT radiances in variable-duration data length files in several formats: standard netCDF like the GES DISC products, AWIPS2, NOAA BUFR, and WMO BUFR.

DISTRIBUTION STATEMENT A. Approved for public release. Distribution is unlimited. This material is based upon work supported by the National Aeronautics and Space Administration under Air Force Contract No. FA8702-15-D-0001. Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Aeronautics and Space Administration.