کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6383634 | 1626332 | 2015 | 8 صفحه PDF | دانلود رایگان |
- The full-depth structure of internal solitons was observed in the SCS deep basin.
- The zonal velocity exceeded 1 m sâ1 near surface and 0.1 m sâ1 near bottom.
- The asymmetry of internal solitons is studied quantitatively.
- The quantitative relation between the asymmetry and water transport is studied.
Ecological parameters, including current velocity, water temperature, and nutrient and chlorophyll a concentrations, accompanied by two internal solitary waves, were observed in the South China Sea deep basin from 2 October to 4 October, 2012. Both solitons belonged to the mode-1 category, which were characterized by a westward velocity exceeding 1 m sâ1 above 500 m and an eastward velocity up to 0.1 m sâ1 below 500 m. The observed structure of the vertical current was asymmetrical. For the first soliton, the downwelling region had a temporal scale of 32 min and an average vertical velocity of 3 cm sâ1, whereas the upwelling region had a temporal scale of 24 min and an average vertical velocity of 2 cm sâ1. For the second soliton, the temporal scale and average velocity were 36 min and 2 cm sâ1 in the downwelling, compared with 26 min and 2 cm sâ1 in the upwelling. On the basis of the convection equation, the downward net vertical displacements of water particles ranged from nearly zero to tens of meters with the maximum value in excess of 50 m. Such asymmetry caused changes in temperature as high as 2.3 °C, nutrient concentrations up to 12.04 μmol Lâ1, and chlorophyll a concentration up to 0.12 μg Lâ1 before and after the passage of the solitons.
Journal: Deep Sea Research Part I: Oceanographic Research Papers - Volume 98, April 2015, Pages 94-101