日本地球惑星科学連合2018年大会

講演情報

[JJ] Eveningポスター発表

セッション記号 M (領域外・複数領域) » M-IS ジョイント

[M-IS13] 海底~海面を貫通する海域観測データの統合解析

2018年5月21日(月) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:有吉 慶介(国立研究開発法人海洋研究開発機構)、木戸 元之(東北大学 災害科学国際研究所)、稲津 大祐(東京海洋大学、共同)、高橋 成実(防災科学技術研究所)

[MIS13-P01] Precise monitoring of the sea surface height by GNSS Reflectometry on D/V Chikyu

★Invited Papers

*市川 香1海老沼 拓史2油布 圭1酒見 亮佑1有吉 慶介3 (1.九州大学応用力学研究所、2.中部大学工学部、3.海洋研究開発機構)

キーワード:GNSS、GNSS-R、地球深部探査船ちきゅう

The sea surface height (SSH) is an important variable in the physical oceanography, which can provide various information such as tides, tsunami, surface geostrophic currents and the heat content of sea surface water. Satellite altimeters have been widely used to measure SSH, but their observations are spatially limited only to the satellite tracks and temporally intermittent. In this study, we have deployed a real-time kinematic (RTK) Global Navigation Satellite System (GNSS) system to D/V Chikyu in order to examine an alternative method to obtain SSH. As far as the vessel stays within about 100km from lands, the RTK GNSS would provide the height of the antenna in a geodetic coordinate, so that SSH in the given coordinate can be obtained if the vertical distance of the antenna from the sea surface are known. The antenna was originally deployed about 36m above the sea surface, but its height would change due to the draft of the vessel. In this study, this height is determined using GNSS reflectometry (GNSS-R). Since the intensity of the received signal is subject to the interferometric intensity variations between the direct and reflected signals, the time scale of the intensity variations of the received signal provides the change rate of the path length of the reflected signal during a GNSS satellite movement. The antenna height can be determined using this change rate and a simple geometry.