Presentation Information
[U16-01]Roles of earth observation satellites for climate change policy: New data from the GOSAT-GW mission★Invited Papers
*Hiroshi Tanimoto1, Tsuneo Matsunaga1, Yu Someya1, Tamaki Fujinawa1, Hirofumi Ohyama1, Isamu Morino1, Hisashi Yashiro1, Takafumi Sugita1, Tazu Saeki1, Yukio Yoshida1, Astrid Mueller1, Satoshi Inomata1, Hyunkwang Lim1, Chi Doan Thien Nguyen1, Yousuke Yamashita1, Sachiko Okamoto1, Kohei Ikeda1, Mahendar Rajwal1, Chia-Hua Hsu1, Yugo Kanaya2, Takashi Sekiya2, Prabir Patra2, Masayuki Takigawa2, Takeshi Kinase2, Yasuko Kasai3, Tomohiro Sato3 (1.National Institute for Environmental Studies, 2.Japan Agency for Marine-Earth Science and Technology, 3.National Institute of Information and Communications Technology)
Keywords:
Greenhouse gases,climate change policy,earth observation satellite,GOSAT-GW
The Japanese Global Observing SATellite for Greenhouse gases and Water cycle (GOSAT-GW) is an Earth-observing satellite to conduct global observations of atmospheric carbon dioxide (CO2), methane (CH4), and nitrogen dioxide (NO2) simultaneously from a single platform. GOSAT-GW is the third satellite in the series of the currently operating Greenhouse gases Observing SATellite (GOSAT) and GOSAT-2. One of its two sensors, the Total Anthropogenic and Natural emissions mapping SpectrOmeter-3 (TANSO-3) is a high-resolution grating spectrometer designed to measure the column-averaged dry-air mole fractions of CO2 and CH4(denoted as XCO2 and XCH4, respectively), as well as the vertical column density of tropospheric NO2, by utilizing the wavelength bands of 0.45, 0.76, and 1.61 µm for NO2, O2, and CO2 and CH4, retrievals, respectively. GOSAT-GW flies in a sun-synchronous orbit with a local overpass time of approximately 13:30 and a 3-day ground-track repeat cycle. The TANSO-3 sensor has two observation modes in the push-broom operation: Wide Mode, which provides globally covered maps with a 10-km spatial resolution within 3 days, and Focus Mode, which provides snapshot maps over targeted areas with a high spatial resolution of 1–3 km. The objectives of the GOSAT-GW mission include (1) monitoring atmospheric global-mean concentrations of greenhouse gasses (GHGs), (2) verifying national anthropogenic GHG emissions inventories, and (3) detecting GHG emissions from large sources, such as megacities and power plants. With a projected operational lifetime of seven years, GOSAT-GW will provide vital space-based constraints on both anthropogenic and natural GHG emissions. The results of the first-light measurements will be presented, possibly in comparison to other satellites and the TCCON and COCCON observations.