Osamu Isoguchi

Fostering tropical cyclone research and applications with Synthetic Aperture Radar

Alexis Aurelien Mouche, Arthur Avenas, Paul C. Chang, Bertrand Chapron et autres

We examine how, over its first decade, the Sentinel-1 mission has advanced the estimation of ocean surface winds over tropical cyclones, supported their global monitoring, and fostered related research. C-band S1 Synthetic Aperture Radar have been instrumental in refining wind retrieval algorithms, …

Fostering Tropical Cyclone Research and Applications with Synthetic Aperture Radar

Alexis Aurelien Mouche, Arthur Avenas, Paul S. Chang, Bertrand Chapron et autres

fr, us, jp (code pays fourni par la source)

Operational Calibration Result of the Advanced Land Observing Satellite-2 (ALOS-2)

Takeo Tadono, Masato Ohki, Takeshi Motohka, Osamu Isoguchi et autres

This paper summarizes an operational calibration result of the Advanced Land Observing Satellites-2 (ALOS-2, nicknamed "DAICHI-2"). ALOS-2, the successor to the Phased Array-type L-band Synthetic Aperture Radar (PALSAR) onboarded ALOS "DAICHI" from 2006 to 2011, was launched in 2014 and has been …

jp (code pays fourni par la source)

Estimation of Ionospheric Tec From Alos-2 Palsar-2 Split-Band Data

Haruya Hirano, Osamu Isoguchi, Takeshi Motohka, Masato Ohki et autres

Ionospheric total electron content (TEC) can significantly affect the range geometric accuracy of spaceborne L-band synthetic aperture radar (SAR) data. This study aims to estimate the ionospheric TEC from single spaceborne L-band SAR data based on the concept of the split-spectrum method. …

jp (code pays fourni par la source)

Evaluation of Ionospheric Path Delay Correction for L-Band sar Orthorectification

Osamu Isoguchi, Koichi Imamura, Takeo Tadono, Masato Ohki et autres

Ionospheric path delay (IPD) correction methods for creating an ortho-rectification product of L-band SAR were examined using the Phased Array type L-band Synthetic Aperture Rader-2 (PALSAR-2). Slant range correction values for the IPD were estimated using two methods. First one is coregistration …

jp (code pays fourni par la source)

Decadal vision in oceanography 2021: Air―sea boundary

Yoko Iwamoto, Hidenori Aiki, Osamu Isoguchi, Yumiko Obayashi et autres

海洋は大気と熱，気体，粒子を交換することで，地球の気候に大きな影響を与える。海洋上の大気境界層における物理・化学・生物過程は，海表面でのCO2 の吸収や雲の生成を介して地球大気の放射収支へ影響する。これはさらに気温・降水・日射の変化を経て海洋にフィードバックをもたらす。気候問題のみならず，台風などの極端現象や波浪の観測・予測を通して，大気海洋境界は人間生活と直接的に関わっている。本稿では，大気と海洋の境「界面」にとどまらず，一次生産の場となる有光層から対流圏までの鉛直的に広い領域とその衛星観測を対象として，次の10年で取り組むべき研究課題を論じた。大気からの栄養塩沈着について，窒素，リン，鉄を含むエアロゾルの沈着は一次生産に寄与するのか？ 海表面のマイクロレイヤーが大気海洋界面として物質循環に果たす役割とマイクロレイヤーの物性をコントロールする要因は？ 温室効果気体や海洋生物起源気体の交換量を精緻化するために何が必要か？ どのような海洋性エアロゾルが雲形成に寄与し放射収支を変化させ得るのか？ 波浪に関わるプロセスについて，物質やエネルギーの交換量を左右する時空間分布を把握するために必要なアプローチは何か？ これらの問いに答えを出し人類が自然環境と共生するために必要な研究，ならびに日本海洋学会と隣接学会との連携について，次の10年を展望する。

jp, us (code pays fourni par la source)

Effects of Ionosphere and Troposphere on L-Band SAR Geometric Accuracy

Haruya Hirano, Osamu Isoguchi, Takeshi Motohka, Takeo Tadono

This study investigated the geometric errors in L-band synthetic aperture radar (SAR) caused by the effects of the ionosphere and troposphere based on observational evidence derived from the Phased Array type L-band SAR-2 (PALSAR-2) onboard the Advanced Land Observing Satellite-2 (ALOS-2) data, …

jp (code pays fourni par la source)

Hurricane Ocean Surface Wind Retrieval from ALOS-2 PALSAR-2 Cross-Polarized Measurements

Osamu Isoguchi, Takeo Tadono, Masato Ohki, Udai Shimada et autres

The relationship between hurricane sea surface wind speed and L-band$\sigma^{0}$is investigated to enable wind estimation under extreme wind condition based on four the Phased Array type L-band Synthetic Aperture Rader-2 (PALSAR-2) hurricane images and wind speed simultaneously measured by National Oceanic and …

jp (code pays fourni par la source)

台風予報の高精度化に向けた高解像度海上風検出

治 磯口, 武雄 田殿, 真人 大木, 宇大 嶋田 et autres

Observing System Simulation Experiments for Tidal Motion from Wide-Swath Ocean Satellite Altimeter Data

Cao Jiangwei, Naoki Hirose, Osamu Isoguchi

Characteristics of environmental factors contributing to ALOS-2 PALSAR wind speed errors

Jae-Cheol Jang, Kyung‐Ae Park, Osamu Isoguchi

Environmental factors affecting the errors in wind speed estimates were investigated using the Advanced Land Observing Satellite-2 Phased Array L-band Synthetic Aperture Radar-2 (ALOS-2 PALSAR-2) data for the period from 1 November 2014 to 30 November 2017. In total, 45 ALOS-2 PALSAR-2 …

kr, jp (code pays fourni par la source)

Wind Speed Retrieval Using L-Band Cross-Poralization Measurements

Osamu Isoguchi, Kenta Ishizuka, Takeo Tadono, Takeshi Motohka et autres

We investigated L-band cross-polarized normalized radar cross section (NRCS) dependence on ocean surface wind for wind speed retrieval. Because it has been reported that the L-band HV NRCS significantly changes due to the Faraday rotation (FR), analysis was conducted on observed NRCS …

jp (code pays fourni par la source)