HR: 17:00h
AN: OS24B-05 INVITED     [Abstracts]
TI: Preliminary transport analysis for P06, A10 and I4+I3 revisits (BEAGLE2003)
AU: * Fukasawa, M
EM: fksw@jamstec.go.jp
AF: JAMSTEC, 2-15, Natsushima, Yokosuka, 237-0061 Japan
AU: Watanabe, S
AF: JAMSTEC, 2-15, Natsushima, Yokosuka, 237-0061 Japan
AU: Yoshikawa, Y
AF: JAMSTEC, 2-15, Natsushima, Yokosuka, 237-0061 Japan
AU: Uchida, H
AF: JAMSTEC, 2-15, Natsushima, Yokosuka, 237-0061 Japan
AU: Schneider, W
AF: University of Concepcion, Barrio Universitario S/N, Cabina 5, Concepcion Chile
AU: Kawano, T
AF: JAMSTEC, 2-15, Natsushima, Yokosuka, 237-0061 Japan
AU: Kaneko, I
AF: JAMSTEC, 2-15, Natsushima, Yokosuka, 237-0061 Japan
AU: Doi, T
AF: Chuden CTI, 1-27-2, Meieki-Minami, Nagoya, 450-0003 Japan
AU: Ozawa, S
AF: Marine Works Japan, 1-16-32, Kamariyahigashi, Kanazawa-ward, Yokohama, 236-0031 Japan
AB: Mass and heat transports across all P06, A10 and I4+I3 were analyzed together based on both revisit data prepared by BEAGLE2003 Expedition and original data during WOCE period. Transports were estimated using an inverse model with 25 neutral density categories. Constraints for calculations were rather simple, i.e., the mass conservation for whole water column, no net mass flux into a basin at deeper layers than the deepest shill located in the north of the observation line, the salt conservation for whole water column and 4Sv of the northward transport between the Rio Grande Rise and the S. American continent. Initial `levels of no motion' were given a priori from vertical profiles of salt and DO. Ekman transports were estimated using NCEP re-analysis data both for the revisit and the original WOCE periods, respectively. Finally, overturn structures especially in the Indian and the Pacific were examined by applying several mass transport values of ITF and we selected solutions which included ITF transport of 15Sv as basic ones for revisit and original WOCE data. Results from present analysis for original WOCE data show good agreements with those from published inverse analyses in the mass and the heat transports. As for results from the analysis with revisit data, a 5 Sv larger (3 Sv smaller) deep overturn is estimated for the Indian (the Pacific) than those with original WOCE data. On the other hand, 5 Sv smaller overturns are estimated both for intermediate and shallower ones in the Pacific-Indian system. As the result, the geostrophic heat flux during the revisit period is estimated to be 0.08 PW which is significantly smaller than that of 0.20 PW during WOCE period. However, the Ekman heat transports compensate geostrophic fluxes, and total heat transports during the revisit and WOCE period turn out to be almost the same value as -0.84+/-0.32 PW and -0.82+/- 0.31 PW, respectively.
DE: 4500 OCEANOGRAPHY: PHYSICAL
DE: 4532 General circulation
DE: 4536 Hydrography
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting