Thursday 25 August 2005

G7

PTH0087
Observation by ocean bottom pressure gauges in the Antarctic Ocean
Doi, Koichiro¹, Shibuya, Kazuo¹, Ishikawa, Naoto², Nogi, Yoshifumi¹
1 National Institute Of Polar Research, Japan
2 School of Earth Sciences, HES, Kyoto University, Japan
Author email: doi@nipr.ac.jp
Two ocean bottom pressure (OBP) gauges were set on the sea floor of the Antarctic Ocean on December 15,2004 in order to investigate sea level changes in open sea and validate satellite data such as ICESat and GRACE. The location where the OBPs were set was 66°52.2'S, 37°49.1'E, that is, in the offing of Lutzow-Holm Bay. One of them was short period type (OBP1), and adequate for observation less than three months. The OBP was got in Icebreaker Shirase on February 10, 2005 in the return cruise of the JARE46. The other OBP is long-term observation type and it will be recovered in February 2006. Fine pressure record more than 50 days was obtained and it contains sea level change caused by a Tsunami due to the Sumatra earthquake occurred at December 26, 2004. We have also been conducting continuous tide gauge observation since 1976 at Syowa Station, which locates on East Ongul Island of Lutzow-Holm Bay. In the presentation we will show the obtained results by analyzing the whole OBP data and also discuss the differences between the result obtained by the OBP and that by the tide gauge at Syowa Station.

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