HR: 0800h
AN: OS31A-0566    [Abstracts]
TI: Decadal Changes in Distributions of CO2-system Properties in the Southern Hemisphere Subtropical Oceans
AU: * Murata, A
EM: akihiko.murata@jamstec.go.jp
AF: Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, Kanagawa, Yokosuka, 237-0061 Japan
AU: Wakita, M
EM: mwakita@jamstec.go.jp
AF: Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, Kanagawa, Yokosuka, 237-0061 Japan
AU: Aoyama, M
EM: maoyama@mri-jma.go.jp
AF: Meteorological Research Institute ute, 1-1, Nagamine, Tsukuba, Ibaraki, Tsukuba, 305-0052 Japan
AU: Watanabe, S
EM: swata@jamstec.go.jp
AF: Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, Kanagawa, Yokosuka, 237-0061 Japan
AU: Fukasawa, M
EM: fksw@jamstec.go.jp
AF: Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka, Kanagawa, Yokosuka, 237-0061 Japan
AB: From August, 2003 to January, 2004, we conducted hydrographic observations along the WHP P6, A10, I4 and I3 lines in the Southern Hemisphere subtropical oceans as part of the CLIVAR/CO$_{2}$ Repeat Hydrography Program. The main target of the observations was to quantify uptake, transport and storage of anthropogenic CO$_{2}$ by Southern Ocean-origin waters. On board the ship (R/V Mirai), we measured pCO$_{2}$ in surface seawater, and dissolved inorganic carbon (C$_{T}$), total alkalinity (A$_{T}$) and pH in water columns. Precision was calculated to be 1.5-1.0 $\mu$mol/kg, 2.0 $\mu$mol/kg and 0.0017-0.0008 pH unit for C$_{T}$, A$_{T}$ and pH, respectively. Both C$_{T}$ and A$_{T}$ were set to the certified values of CRM (Bach 65) provided by Dr. A.G. Dickson of Scripps Institution of Oceanography. The accuracy was estimated to be approx. 3 $\mu$mol/kg, 3 $\mu$mol/kg and 0.008 pH unit for C$_{T}$, A$_{T}$ and pH, respectively, by comparing measured and calculated values, which were based on the thermodynamic relationship of oceanic carbonate system. We intend to detect decadal changes of transport and storage of CO$_{2}$ in the ocean­_s interior by calculating the differences of CO$_{2}$-system properties and anthropogenic CO$_{2}$ tracers between 1990s and 2003/2004. At the time of presentation, we will discuss the decadal changes from the viewpoint of global climate change.
DE: 4806 Carbon cycling
DE: 4215 Climate and interannual variability (3309)
DE: 4283 Water masses
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting