TY - JOUR
T1 - How a Small Reef in the Kuroshio Cultivates the Ocean
AU - Hasegawa, D.
AU - Matsuno, T.
AU - Tsutsumi, E.
AU - Senjyu, T.
AU - Endoh, T.
AU - Tanaka, T.
AU - Yoshie, N.
AU - Nakamura, H.
AU - Nishina, A.
AU - Kobari, T.
AU - Nagai, T.
AU - Guo, X.
N1 - Funding Information:
The authors thank the captain, crew, and students of the TRV for time and help. We are grateful to the two reviewers for their useful comments and suggestions that led to considerable improvement of the paper. The field program was conducted as a part of the OMIX project (MEXT KAKENHI Grant Number JP15H05818, JP15H05821, JP18H04914, JP16H01590, and JP18H04920). We also thank Dr. I. Yasuda for his great leadership on the OMIX project. Kagoshima Maru
Publisher Copyright:
© 2021. The Authors.
PY - 2021/4/16
Y1 - 2021/4/16
N2 - Vertical nitrate fluxes associated with turbulent mixing and upwelling around a small reef in the Kuroshio are quantified by continuously deploying a turbulence microstructure profiler with an attached submersible ultraviolet nitrate analyzer while drifting from the upstream to the downstream of the reef. Flow separations and trains of Kelvin-Helmholtz billows (thickness = 60 m) are identified using a shipboard ADCP and an echo-sounder. The turbulence diffusivity associated with the vigorous turbulent mixing reaches up to O(10−1 m2 s−1), resulting in strong nitrate fluxes of O(1–103 mmol m−2 day−1). In addition, large differences between the upstream and downstream density profiles suggest a strong upwelling velocity of O(10−3 m s−1), as well as an upwelling nitrate flux of O(102 mmol m−2 day−1) in the entire subsurface layer.
AB - Vertical nitrate fluxes associated with turbulent mixing and upwelling around a small reef in the Kuroshio are quantified by continuously deploying a turbulence microstructure profiler with an attached submersible ultraviolet nitrate analyzer while drifting from the upstream to the downstream of the reef. Flow separations and trains of Kelvin-Helmholtz billows (thickness = 60 m) are identified using a shipboard ADCP and an echo-sounder. The turbulence diffusivity associated with the vigorous turbulent mixing reaches up to O(10−1 m2 s−1), resulting in strong nitrate fluxes of O(1–103 mmol m−2 day−1). In addition, large differences between the upstream and downstream density profiles suggest a strong upwelling velocity of O(10−3 m s−1), as well as an upwelling nitrate flux of O(102 mmol m−2 day−1) in the entire subsurface layer.
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U2 - 10.1029/2020GL092063
DO - 10.1029/2020GL092063
M3 - Article
AN - SCOPUS:85104278917
SN - 0094-8276
VL - 48
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 7
M1 - e2020GL092063
ER -