FRONTIER Newsletter No.9 Jan.2000

Joint research in the FORSGC
In this corner, we like to introduce the activities of the FORSGC, which carries out global change research, together with the FRSGC. This time Mr. Inagake, who belongs to the National Research Institute for Far Sea Fisheries(NRIFSF), has contributed its joint study with the NRIFSF to this Newsletter.

Joint Research between the NRIFSF and the FORSGC
Study and observation on heat transport in upper oceans

"Study and observation for heat transport in upper oceans" started between the NRIFSF and JAMSTEC (FORSGC) as a joint study. This joint study aims to perform oceanographic observation mainly in the equatorial region of the Indian Ocean and the western Pacific Ocean by research vessels, fishing boats, and merchant vessels, and by grasping quantatively oceanic variations, heat storage and heat transport in these regions, to elucidate their relation with ENSO (El Ni n o/Southern Oscillation) and the Dipole Mode Event.

Up to FY 1998, NRIFSF has been researching on the oceanic structure of the Indian Ocean and its variation style, and their relation with ENSO, under the project "On the Asian Monsoon Mechanism" (with the Funds for the Promotion of Surveys and Research on Earth Science and Technology and Ocean Development in STA, 1989 - 1998) collaborating with the Meteorological Research Institute (MRI), the Japan Meteorological Agency (JMA), the Maritime Safety Agency/Hydrographic Department, etc. From FY 1999, this research project is to be performed under the new contract between JAMSTEC and other institute, (in practice, the FORSGC/Climate Variations Observational Program, Director, Dr.Kensuke Takeuchi). "Study and observation for heat transport in upper oceans" is the first joint cooperative study in FORSGC.

Schematic figure of the joint study named "Study and observation for heat transport in upper oceans"

As the results of one decade of research, "On the Asian Monsoon Mechanism", we have discovered new knowledge of the oceanic circulation, seasonal variations, inter- annual variations, and their relation with ENSO in the Indian Ocean, in which observation itself was not enough in the past. Based on these results of research and under this project, we will, make research quantitatively on variations of heat storage and heat transport by oceanic circulation in the Indian Ocean, which are closely related with ENSO.In FY 1999, we carry out IX 6 (XBT high- density observation between the northern end of Sumatra and the Mauritius island) fixed line observation of WOCE/CLIVAR and VOS observation by fishing boats in the east and west Indian Ocean.XBT observation will be made using containership "Delmas Blosseville" in January 2000 as a part of IX 6 observations.

At the start of this joint study, we have made XCTD observation along the IX 6 line (once in every two hours in cruise, 94 point in total), ADCP observation (current profile within sea depth less than about 700 m) and automatic meteorological observation, by using the research vessel "Kaiyo Maru" of the Fishery Agency at the beginning of November, 1999. Hereafter, we carry out the observation plan in this fiscal year and analyze the survey result.
After the next fiscal year, we will continue the oceanographic observation focusing on the Indian Ocean and the western Pacific Ocean equatorial, and carry out quantitative grasp of oceanic variations of the Indian Ocean and the amount of heat transport to elucidate roles of the Indian Ocean fulfilled for the ocean climate change, such as ENSO etc.
Denzo Inagake,
Chief of Low Latitudes Oceanography Section,
National Research Institute of Far Seas Fisheries
http://ss.enyo.affrc.go.jp/