We describe the space-and-time structure of large-scale thermal anomalies in the upper layer in the tropical zone of the Indian Ocean and study the mechanism of their formation. It is shown that the critical layer in which the phase velocities of propagation of disturbances coincide with the mean velocity of the zonal current can be formed in the central part of equatorial zone of the Indian Ocean (between 9° and 12°S). In this layer, the formation of growing disturbances is possible due to the barotropic-baroclinic instability of the system of zonal currents.
Similar content being viewed by others
References
A. Schiller and G. Meyers, “Seasonal near-surface dynamics and thermodynamics of the Indian Ocean and Indonesian Throughflow in a Global Ocean General Circulation Model,” J. Phys. Oceanogr., 28, 2288–2312 (1998).
G. Meyers and R. Boscolo, “The Indian Ocean Observing System (IndOOS),” Clivar Exch., 11, No. 4, 2–8 (2006).
A. Suryachandra, A. Masumoto, and T. Yamagata, “Interannual variability in the subsurface Indian Ocean with a special emphasis on the Indian Ocean Dipole,” Deep-Sea Res.-II, 4, 1549–1572 (2001).
A. Suryachandra, S. K. Behera, and T. Yamagata, “Subsurface interannual variability associated with the Indian Ocean Dipole,” Clivar Exch., 7, 11–13 (2002).
A. B. Polonskii, A. V. Torbinskii, and G. Meyers, “Interannual variations of heat storage in the upper layer of the equatorial zone of the Indian Ocean and the Indian-Ocean Dipole,” Morsk. Gidrofiz. Zh., No. 3, 15–27 (2007).
V. A. Bubnov, Circulation of Equatorial Waters in the World Ocean, Gidrometeoizdat, Leningrad (1990).
Author information
Authors and Affiliations
Additional information
Translated from Morskoi Gidrofizicheskii Zhurnal, No. 2, pp. 3–11, March–April, 2009.
Rights and permissions
About this article
Cite this article
Polonskii, A.B., Torbinskii, A.V. Velocity of propagation of temperature anomalies in the tropical zone of the Indian Ocean. Phys Oceanogr 19, 63–71 (2009). https://doi.org/10.1007/s11110-009-9042-x
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11110-009-9042-x