XBT Analysis - Brazil Current variability at 22°S

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The Brazil Current

Location of the AX97 realizations, which were used to compute the Brazil Current variability at 22°S, overlaid on the (left) Mean Dynamic Topography, and (right) Mean Geostrophic Velocity from the MDT_CNES-CLS09 climatology.

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Brazil Current velocity and transport variability (22°S)

(upper-left) Mean absolute geostrophic velocity accross 22°S computed using 46 AX97 realizations, and its (upper-right) standard deviation. (lower) Time-series for the Brazil Current volume transport accross 22°S (1 Sv = 106m3s-1). The eastern edge of the Brazil Current is defined as the location of the maximum southward cumulative transport. The IPRC dynamic topography climatology is adopted as the reference level at 400 m.

The temperature variability accross the Brazil Current front at 22°S can be found here>>

The XBT data along AX97 can be obtained here>>

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References

Mata M.M., M. Cirano, M.R. van Caspe, C.S. Fonteles, G. Goni, and M. Baringer, 2012: Observations of Brazil Current baroclinic transport near 22°S: variability from the AX97 XBT transect. CLIVAR Exchanges 58(17):5-10. [PDF]

Goni, G.J., F. Bringas, and P.N. Di Nezio, 2011: Observed Low Frequency Variability of the Brazil Current Front. J. Geophys. Res., 116, C10037, doi:10.1029/2011JC007198. [PDF]

Lentini C., G.J. Goni and D. Olson, 2006: Investigation of Brazil Current rings in the confluence region. J. Geophys. Res., 111(C6):C06013,doi:10.1029/2005JC002988. [PDF]

Goni, G.J. and I. Wainer, 2001: Investigation of the Brazil Current front variability from altimeter data. J. Geophys. Res.,106:31117-31128. [PDF]

Wainer, I., P. Gent, and G.J. Goni, 2000: Annual cycle of the Brazil-Malvinas confluence region in the National Center for Atmospheric Research climate system model. J. Geophys. Res., 05(C11):26,167-26,177.

Boebel O., C. Schmid, G. Podesta, and W. Zenk, 1999: Intermediate water in the Brazil-Malvinas Confluence Zone: A Lagrangian view. J. Geophys. Res., 104(C9):21,063-21,082. [PDF]

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Acknowledgments

The Mean Dynamic Topography and Mean Geostrophic Velocity fields are from the MDT_CNES-CLS09 climatology produced by CLS Space Oceanography Division and distributed by AVISO, with support from CNES.