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| Ishii, Masao; Rodgers, Keith B.; Inoue, Hisayuki Y.; Toyama, Katsuya; Sasano, Daisuke; Kosugi, Naohiro; Ono, Hisashi; Enyo, Kazutaka; Nakano, Toshiya; Iudicone, Daniele; Blanke, Bruno; Aumont, Olivier; Feely, Richard A.. |
| Identifying ocean acidification and its controlling mechanisms is an important priority within the broader question of understanding how sustained anthropogenic CO2 emissions are harming the health of the ocean. Through extensive analysis of observational data products for ocean inorganic carbon, here we quantify the rate at which acidification is proceeding in the western tropical Pacific Warm Pool, revealing ‐0.0013 ±0.0001 yr‐1 for pH and ‐0.0083±0.0007 yr‐1 for the saturation index of aragonite for the years 1985‐2016. However, the mean rate of total dissolved inorganic carbon increase (+0.81 ±0.06 μmol kg‐1 yr‐1) sustaining acidification was ~20% slower than what would be expected if it were simply controlled by the rate of atmospheric CO2 increase... |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00641/75337/76003.pdf |
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| Qiu, Bo; Nakano, Toshiya; Chen, Shuiming; Klein, Patrice. |
| With radar interferometry, the next-generation Surface Water and Ocean Topography satellite mission will improve the measured sea surface height resolution down to 15 km, allowing us to investigate for the first time the global upper ocean variability at the submesoscale range. Here, by analysing shipboard Acoustic Doppler Current Profiler measurements along 137 degrees E in the northwest Pacific of 2004-2016, we show that the observed upper ocean velocities are comprised of balanced geostrophic flows and unbalanced internal waves. The transition length scale, L-t, separating these two motions, is found to depend strongly on the energy level of local mesoscale eddy variability. In the eddy-abundant western boundary current region of Kuroshio, L-t can be... |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00368/47935/47962.pdf |
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