Dr. Takashi M. Nagao Profile

Dr. Takashi M. Nagao

at Japan Aerospace Exploration Agency

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Proceedings Article | 22 October 2018 Paper

Synergistic use of next-generation geostationary and polar orbit satellites for investigating aerosols, clouds, and radiation

Takashi Nakajima, Hideaki Takenaka, Takashi Nagao, Letu Husi

Proceedings Volume 10776, 1077607 (2018) https://doi.org/10.1117/12.2323564

KEYWORDS: Clouds, Satellites, Aerosols, Imaging systems, Atmospheric particles, Radar, Algorithm development, Multispectral imaging, Reflectivity

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In this paper, we propose the synergistic use of geostationary and polar orbital satellites, namely the thirdgeneration Himawari-8, GCOM-C and EarthCARE. These satellites have been or will be launched in the middle of the 2010s to the early of 2020s will contribute to observing aerosols, clouds, and radiation in the Earth system. Because aerosols and clouds exert great effects on the planet’s water, energy, and radiation balances and processes, it is important to gather more observations and improve our understanding of the lifecycle of these particles. Complementing existing passive sensors, CloudSat and CALIPSO have ushered in a new era in aerosol and cloud observations to reveal the particle transition, from cloud condensation nuclei to rain droplets via clouds and drizzle particles. Contoured Frequency by Optical Depth Diagrams (CFODDs), a method of visualizing the CloudSat radar reflectivities, clearly show the transition of cloud growth, from cloud droplet mode to rain mode via drizzle mode. Moreover, the thirdgeneration geostationary weather satellite, which began its operation in 2015, observes global-scale aerosols and cloud systems every 10 min (or 2.5min). Therefore, the combined use of polar orbital passive/active sensors and geostationary satellites will reveal details of the cloud evolution process by using the multi-spectral and vertical observations of the passive/active sensors.

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