Modeling Study of the Antarctic Circumpolar Current Variability Based on Argo Data
The Antarctic Circumpolar Current (ACC) variability is studied using the Argo-Based Model for Investigation of the Global Ocean (AMIGO) recently developed at the Shirshov Institute of Oceanology. A prominent feature of the method is the application of variational interpolation of irregularly located Argo measurements to a regular grid followed by model hydrodynamic adjustment of the obtained fields. Such an approach for the Argo data processing makes it possible to obtain a full set of oceanographic characteristics: temperature, salinity, and current velocity. The mean ACC transport over a period of 2005–2014 through the Drake Passage based on the AMIGO data is diagnosed as 162 ± 5 Sv. The transport through the African section south of Cape Town is 0.6 Sv higher due to the Pacific water flow to the Arctic Ocean in the Bering Strait, which then increases the transport in the Atlantic. In the Indian sector the mean ACC transport is increasing by 15.4 Sv to compensate the water flow from the Pacific to the Indian Ocean through the Indonesian Straits (Indonesian Throughflow). Thus, the resulting mean transport between Australia and Antarctica is calculated as 178 ± 6 Sv. These modeling results agree very well with the previous transports calculations based on direct velocity measurements.
This work was supported by the Russian Science Foundation (project no. 16-17-10149).
- 1.Antonov, J. I., Seidov, D., Boyer, T. P., et al. (2010). World Ocean Atlas 2009, Vol. 2: Salinity. In S. Levitus (Ed.), NOAA Atlas NESDIS 69 Ser. Washington, D.C.: US Government Printing Office.Google Scholar
- 2.Argo. (2000). Argo float data and metadata from Global Data Assembly Center (Argo GDAC). SEANOE. http://doi.org/10.17882/42182.
- 7.Gladyshev, S. V., Koshlyakov, M. N., & Tarakanov, R. Yu. (2008). Currents in the Drake Passage based on observations in 2007. Oceanology, 48(6), 759–770.Google Scholar
- 8.Ivanov, Yu. A, Lebedev, K. V., & Sarkisyan, A. S. (1997). Generalized hydrodynamic adjustment method (GHDAM). Izvestiya Atmospheric and Oceanic Physics, 33(6), 752–757.Google Scholar
- 9.Ivanov, Yu. A, & Lebedev, K. V. (2000). Integral average monthly characteristics of the World Ocean climate. Izvestiya Atmospheric and Oceanic Physics, 36(2), 244–252.Google Scholar
- 10.Koshlyakov, M. N., Gladyshev, S. V., Tarakanov, R. Yu., & Fedorov, D. A. (2011). Currents in the Western Drake Passage according to the observations in January of 2010. Oceanology, 51(2), 187–198.Google Scholar
- 11.Koshlyakov, M. N., Gladyshev, S. V., Tarakanov, R. Yu., & Fedorov, D. A. (2012). Currents in the Drake Passage based on the observations in November of 2010. Oceanology, 52(3), 299–308.Google Scholar
- 12.Koshlyakov, M. N., Gladyshev, S. V., Tarakanov, R. Yu., & Fedorov, D. A. (2013). Currents in the Drake Passage by the observations in October–November of 2011. Oceanology, 53(1), 1–12.Google Scholar
- 14.Lebedev, K. V. (1999). Average annual climate of the ocean. Part 2: Integral characteristics of the World Ocean climate (mass, heat, and salt transports). Izvestiya Atmospheric and Oceanic Physics, 35(1), 87–96.Google Scholar
- 16.Lebedev, K. V., DeCarlo, S., Hacker, P. W., et al. (2010). Argo Products at the Asia-Pacific Data-Research Center. Eos Trans. AGU, 91(26). Ocean Science Meeting Suppl., Abstract IT25A-01.Google Scholar
- 18.Locarnini, R. A., Mishonov, A. V., Antonov, J. I., et al. (2010). World Ocean Atlas 2009, Vol. 1: Temperature. In S. Levitus (Ed.), NOAA Atlas NESDIS 68 Ser. Washington, D.C.: US Government Printing Office.Google Scholar
- 19.Morozov, E. G., Tarakanov, R. Yu., Ansorge, I., & Swart, S. (2014). Jets and Transport of the Antarctic Circumpolar Current in the Drake Passage. Fundamentalnaya i Prikladnaya Gidrofizika, 7(3), 23–28.Google Scholar
- 23.Whitworth, T. (1983). Monitoring the Transport of the Antarctic Circumpolar Current at Drake Passage. Journal of Physical Oceanography, 13(11), 2045–2057Google Scholar