SASAI, YOSHIKAZU

SASAKI, HIDEHARU

佐々木, 英治

笹井, 義一

Earth Simulator Research Results Repository

ACG06-04 Room:304 Time:May 19 11:55-12:10
Variability of Kuroshio nitrate flux and transport in the western North Pacific: A model
study
Yoshikazu Sasai1¤, Hideharu Sasaki1
1Japan Agency for Marine-Earth Science and Technology
An eddy-resolving coupled physical-biological ocean model has been employed to examine the interannual variability of
nitrate flux and transport mechanism by the Kuroshio during 1995-2010. The Kuroshio provides an advective flux of nitrate
carried in subsurface waters, redistributing nitrate from the tropics to the mid-latitude. Some observed data capture the nitrate
flux and transport in the subsurface layers by the Kuroshio. The model reproduces the maximum nitrate flux core in the subsurface
layer from the eastern side of Luzon (16N) to the Kuroshio Extension (36N) with the downstream. High phytoplankton blooms
along the south of Japan (subpolar region) in the winter and spring seasons appear in the model, and the advective flux of nitrate
with the downstream to the subpolar region contributes to the high blooms. Because the downstream of nitrate transport by the
Kuroshio appears under the winter mixed layer in the south of Japan, the high blooms are enhanced. The model also reproduces
the interannual variability of nitrate flux and transport by the Kuroshio in the North Pacific. The change of Kuroshio speed and
structure are major causes for interannual variability of nitrate flux and transport. The simulated nitrate concentration in the
Kuroshio shows interannual variation.
Keywords: Nitrate transport, Kuroshio, Interannul variability, High-resolution ocean physical-biological model
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Variability of Kuroshio nitrate flux and transport in the western North Pacific: A model study

http://www.jamstec.go.jp/jdb/ronbun/Ks00038169.pdf

Variability of Kuroshio nitrate flux and transport in the western North Pacific: A model study

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