Feasibility Study for Future Spaceborne Coherent Doppler Wind Lidar， Part 2: Measurement Simulation Algorithms and Retrieval Error Characterization

Philippe BARON; Shoken ISHII; Kozo OKAMOTO; Kyoka GAMO; Kohei MIZUTANI; Chikako TAKAHASHI; Toshikazu ITABE; Toshiki IWASAKI; Takuji KUBOTA; Takashi MAKI; Riko OKI; Satoshi OCHIAI; Daisuke SAKAIZAWA; Masaki SATOH; Yohei SATOH; Taichu Y. TANAKA; Motoaki YASUI

doi:10.2151/jmsj.2017-018

This article has now been updated. Please use the final version.

Feasibility Study for Future Spaceborne Coherent Doppler Wind Lidar， Part 2: Measurement Simulation Algorithms and Retrieval Error Characterization

Philippe BARON, Shoken ISHII, Kozo OKAMOTO, Kyoka GAMO, Kohei MIZUTANI, Chikako TAKAHASHI, Toshikazu ITABE, Toshiki IWASAKI, Takuji KUBOTA, Takashi MAKI, Riko OKI, Satoshi OCHIAI, Daisuke SAKAIZAWA, Masaki SATOH, Yohei SATOH, Taichu Y. TANAKA, Motoaki YASUI

Author information

Philippe BARON
National Institute of Information and Communications Technology，Applied Electromagnetic Research Institute，Koganei，Japan
Shoken ISHII
National Institute of Information and Communications Technology，Applied Electromagnetic Research Institute，Koganei，Japan
Kozo OKAMOTO
Meteorological Research Institute，Japan Meteorological Agency，Tsukuba， Japan
Kyoka GAMO
Fujitsu FIP Corporation，Tokyo, Japan
Kohei MIZUTANI
National Institute of Information and Communications Technology，Applied Electromagnetic Research Institute，Koganei，Japan
Chikako TAKAHASHI
Fujitsu FIP Corporation，Tokyo, Japan
Toshikazu ITABE
National Institute of Information and Communications Technology，Applied Electromagnetic Research Institute，Koganei，Japan
Toshiki IWASAKI
Graduate School of Science，Tohoku University，Sendai, Japan
Takuji KUBOTA
Earth Observation Research Center，Japan Aerospace Exploration Agency，Tsukuba， Japan
Takashi MAKI
Meteorological Research Institute，Japan Meteorological Agency，Tsukuba， Japan
Riko OKI
Earth Observation Research Center，Japan Aerospace Exploration Agency，Tsukuba， Japan
Satoshi OCHIAI
National Institute of Information and Communications Technology，Applied Electromagnetic Research Institute，Koganei，Japan
Daisuke SAKAIZAWA
Earth Observation Research Center，Japan Aerospace Exploration Agency，Tsukuba， Japan
Masaki SATOH
The University of Tokyo，Kashiwa，Japan
Yohei SATOH
Satellite Technology Innovation Office，Japan Aerospace Exploration Agency，Tsukuba， Japan
Taichu Y. TANAKA
Meteorological Research Institute，Japan Meteorological Agency，Tsukuba， Japan
Motoaki YASUI
National Institute of Information and Communications Technology，Applied Electromagnetic Research Institute，Koganei，Japan

Keywords: Doppler lidar, satellite, remote sensing, wind, aerosol, simulation

JOURNAL FREE ACCESS Advance online publication

Article ID: 2017-018

DOI https://doi.org/10.2151/jmsj.2017-018

The final version of this article is now available: Vol. 95 (2017), No. 5 pp. 319-342

Details

Abstract

A feasibility study of tropospheric wind measurements by a coherent Doppler lidar aboard a super-low-altitude satellite is being conducted in Japan. The considered lidar uses a 2.05 μ m laser light source of 3.75 W. In order to assess the measurement performances, simulations of wind measurements were conducted. The mission definition is presented in a companion paper (Part 1) while, in this paper, we describe the measurement simulator and characterize the errors on the retrieved line-of-sight (LOS) winds. Winds are retrieved from the Doppler-shift of the noisy backscattered signal with a horizontal resolution of 100 km along the orbit track and a vertical resolution between 0.5 and 2 km. Cloud and wind fields are the pseudo-truth of an Observing System Simulation Experiment while aerosol data are from the Model-of-Aerosol-Species-IN-the-Global-AtmospheRe (MASINGAR) constrained with the pseudo-truth wind. We present the results of the analysis of a full month of data in summer time for a near-polar orbiting satellite and a LOS nadir angle of 35°. Below ≈ 8 km, the ratio of good retrievals is 30—55 % and the median LOS wind error is better than 0.6 m s^-1 (1.04 m s^-1 for the horizontal wind). In the upper troposphere, the ratio is less than 15 % in the southern hemisphere and high-latitudes. However the ratio is still 35 % in the northern Tropics and mid-latitudes where ice-clouds frequently occur. The upper-tropospheric median LOS-wind measurement error is between 1-2 m s^-1 depending on the latitude (1.74-3.5 m s^-1 for the horizontal wind). These errors are dominated by uncertainties induced by spatial atmospheric inhomogeneities.

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