Makassar Strait throughflow, 2004 to 2006

報告人：沈茂霖　　　　 (Mao-Lin Shen)

112/04/18

Seminar report

112/04/18 Mao-Lin Shen, Dept. of Atmospheric Sciences, NTUMao-Lin Shen, Dept. of Atmospheric Sciences, NTU Page 2

Gordon, A. L., R. D. Susanto, A. Ffield, B. A. Huber, W. Pranowo, and S. Wirasantosa (2008), Makassar Strait throughflow, 2004 to 2006, Geophys. Res. Lett., 35(24), L24605.

Introduction Makassar Moorings Along-Channel Speed Along-Channel Transport and Transport-Weighted Te

mperature

112/04/18 Mao-Lin Shen, Dept. of Atmospheric Sciences, NTUMao-Lin Shen, Dept. of Atmospheric Sciences, NTU Page 3

Introduction─ Seasonal variations-Circulation patterns

100 105 110 115 120 125 130 135 140-20

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100 105 110 115 120 125 130 135 140-20

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Fig. Circulation patterns of the South China Sea and Indonesian Seas, with emphasis on the trans-South China Sea flows. The short-dashed lines represent subsurface currents. (by Guohong Fang)

112/04/18 Mao-Lin Shen, Dept. of Atmospheric Sciences, NTUMao-Lin Shen, Dept. of Atmospheric Sciences, NTU Page 4

Introduction─

Fig. Temperature (upper panel) and salinity (lower panel) on the σ 25.5 surface, which lies within the upper thermocline. The Indonesian throughflow (ITF) can be traced as a relatively cool, fresher, band across the Indian Ocean near 12°S.

112/04/18 Mao-Lin Shen, Dept. of Atmospheric Sciences, NTUMao-Lin Shen, Dept. of Atmospheric Sciences, NTU Page 5

Fig. Indonesian throughflow pathways and estimates of total volume transport. The lower panel shows the partitioning of transport above and below the Makassar Strait sill depth of ~680 m. Modified from Gordon and Fine (1996). (Gordon, 2005)

112/04/18 Mao-Lin Shen, Dept. of Atmospheric Sciences, NTUMao-Lin Shen, Dept. of Atmospheric Sciences, NTU Page 6

Introduction─ Makassar Strait throughflow

112/04/18 Mao-Lin Shen, Dept. of Atmospheric Sciences, NTUMao-Lin Shen, Dept. of Atmospheric Sciences, NTU Page 7

Along-Channel Speed

A maximum speed within thermocline

112/04/18 Mao-Lin Shen, Dept. of Atmospheric Sciences, NTUMao-Lin Shen, Dept. of Atmospheric Sciences, NTU Page 8

Along-Channel Speed

112/04/18 Mao-Lin Shen, Dept. of Atmospheric Sciences, NTUMao-Lin Shen, Dept. of Atmospheric Sciences, NTU Page 9

Along-Channel Speed

Fig. The timing and Southern Oscillation Index (SOI) value of transport measurement through the key passages of the Indonesian throughflow pathways. Only the Ombai measurements were made during a La Niña, albeit weak, condition.

112/04/18 Mao-Lin Shen, Dept. of Atmospheric Sciences, NTUMao-Lin Shen, Dept. of Atmospheric Sciences, NTU Page 10

Along-Channel Transport and Transport-Weighted Temperature The seasonal fluctuations were influenced by

Mindanao Current the ENSO influence on the ITF

112/04/18 Mao-Lin Shen, Dept. of Atmospheric Sciences, NTUMao-Lin Shen, Dept. of Atmospheric Sciences, NTU Page 11

Thank you for your attention.