Seasonal variations of the upper ocean in the western north pacific observed by an argo float |
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| Authors: | Naoto Iwasaka Fumiaki Kobashi Yosuke Kinoshita Yuko Ohno |
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| Institution: | (1) Institute of Observational Research for Global Change, JAMSTEC, Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan;(2) Department of Marine Technology, Tokyo University of Marine Science and Technology, Etchujima, Koto-ku, Tokyo 135-8533, Japan |
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| Abstract: | A seasonal evolution of surface mixed layer in the western North Pacific around 24°N between 143°E and 150°E was observed
by using an Argo float for more than 9 months, from December 2001 through August 2002. The result showed that the mixed layer
deepened gradually in the first two months. It reached its maximum depth of about 130 m at the end of January, after which
the mixed layer varied largely and sometimes the pycnocline below the mixed layer was much weakened until the summer mixed
layer formed in late April. The thin surface mixed layer was maintained during the rest of the observation period. Heat budget
analysis suggests that the vertical and horizontal temperature advections are the two most dominant terms in the heat balance
in the upper layer on time scales from a few days to a month. The vertical motions that are possibly responsible for the vertical
temperature advection are discussed. |
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| Keywords: | Argo float observation oceanic mixed layer heat balance internal tide barotropic response |
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