Interannual variability of the Antarctic Circumpolar Current (ACC) around the western Drake Passage

Yu Chen Hsu, Chau-Ron Wu, Chung-Pan Lee

Abstract


An empirical mode decomposition (EMD) was applied to 20-year (1992-2012) time series of Maps of Absolute Dynamic Topography (MADT) distributed by the AVISO. The Hilbert–Huang transform (HHT) uses the EMD method to decompose a complicated dataset into a finite number of components, the so-called intrinsic mode functions (IMFs). As a result, low frequency and higher relationships have been found in the vicinity of the Western Drake Passage. Lee (2005) has provided a hypothesis that vortex shedding in the eastern South America might trigger El Niño in the tropical Pacific. It could provide a mechanism to explain that there exists a mechanism to trigger both phenomena simultaneously.

Keywords


the Drake Passage; Antarctic Circumpolar Current (ACC);MEI; HHT

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References


Billany, W., et al. (2010). Variability of the Southern Ocean fronts at the Greenwich Meridian. Journal of Marine Systems 82.4: 304-310.

Chung-Pan Lee (2005) . A hypothesis on the cause of El Niño-the vortex shedding behind the South America (east of Drake passage). Marine Kaohsiung,Vol. 7, pp. 17–20.(Mandarin)

Gordon, A.L.(1986). Interocean exchange of thermocline water. J. Geophys. Res. 91,5037–5046. doi:10.1029/JC091iC04p05037

Huang, N.E., Shen, Z., Long, S.R., et al (1998). The empirical mode decomposition and the Hilbert spectrum for nonlinear and nonstationary time series analysis. Proceedings: Mathematical, Physical, and Engineering Sciences 454 (1971),903–995.

Olbers, D., Borowski, D. A. N. I. E. L., Völker, C., & WOeLFF, J. O. (2004). The dynamical balance, transport and circulation of the Antarctic Circumpolar Current. Antarctic science, 16(4), 439-470.

Sloyan, B.M., Rintoul, S.R (2001a). The Southern Ocean Limb of the global deep overturning circulation. J. Phys. Oceanogr. 31 (1), 143–173. doi:10.1175/1520-0485 (2001)031b0143:TSOLOTN2.0.CO;2.

Sloyan, B.M., Rintoul, S.R (2001b). Circulation, renewal, and modification of Antarctic mode and intermediate water. J. Phys. Oceanogr. 31 (4), 1005–1030. doi:10.1175/1520- 0485(2001)031b1005:CRAMOAN2.0.CO;2.

Sokolov, S., & Rintoul, S. R. (2007). Multiple jets of the Antarctic Circumpolar Current south of Australia. Journal of Physical Oceanography, 37(5).

Sokolov, S., & Rintoul, S. R. (2009). Circumpolar structure and distribution of the Antarctic Circumpolar Current fronts: 1. Mean circumpolar paths. Journal of Geophysical Research: Oceans (1978–2012), 114(C11).

Sokolov, S., & Rintoul, S. R. (2009). Circumpolar structure and distribution of the Antarctic Circumpolar Current fronts: 2. Variability and relationship to sea surface height. Journal of Geophysical Research: Oceans (1978–2012),114(C11).

Speich, S., Blanke, B., Madec, G (2001). Warm and cold water routes of an OGCM thermohaline Conveyor Belt. Geophys. Res. Lett. 28 (2), 311–314.

Swart, S., Speich, S (2010). An altimetry-based gravest empirical mode south of Africa: 2. Dynamic nature of the Antarctic Circumpolar Current fronts. J. Geophys. Res. 115,C03003. doi:10.1029/2009JC005300.

Swart, S., Speich, S., Ansorge, I.J., Goni, G.J., Gladyshev, S., Lutjeharms, J.R.E.(2008). Transport and variability of the Antarctic Circumpolar Current south of Africa. J. Geophys. Res. 113, C09014. doi:10.1029/2007JC004223.

Swart, S., Speich, S., Ansorge, I.J., Lutjeharms, J.R.E. (2010). An altimetry-based gravest empirical mode south of Africa: 1. Development and validation. J. Geophys. Res. 115, C03002. doi:10.1029/2009JC005299.




DOI: https://doi.org/10.9753/icce.v34.posters.1