Abstract
Ten years of altimeter data are used in conjunction with temperature and salinity data within a two-layer reduced gravity approximation to investigate the shedding and translation of North Brazil Current rings. Space-time diagrams of sea height anomalies and residues along the altimeter groundtracks show large seasonal and interannual variability. Results presented here confirm previous estimates that indicate a shedding rate of 3 to 7 rings per year with no marked seasonal variability but with very strong year-to-year variability. Additionally, eddies not shed by the retroflection travel through the region as well. Most of the rings pass very near of Barbados, affecting the environment in the region, of which seven rings during the study period are seen to enter into the Caribbean Sea. A link is found in this study between long-term surface temperature changes in the tropical Atlantic and the number of rings shed at the NBC retroflection, where periods of time with warmer surface temperatures are associated to a higher number of rings shed.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 335-356 |
| Number of pages | 22 |
| Journal | Elsevier Oceanography Series |
| Volume | 68 |
| Issue number | C |
| DOIs | |
| State | Published - 2003 |
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ASJC Scopus subject areas
- Oceanography
Cite this
Synoptic study of warm rings in the North Brazil Current retroflection region using satellite altimetry. / Goni, Gustavo J.; Johns, William E.
In: Elsevier Oceanography Series, Vol. 68, No. C, 2003, p. 335-356.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Synoptic study of warm rings in the North Brazil Current retroflection region using satellite altimetry
AU - Goni, Gustavo J.
AU - Johns, William E
PY - 2003
Y1 - 2003
N2 - Ten years of altimeter data are used in conjunction with temperature and salinity data within a two-layer reduced gravity approximation to investigate the shedding and translation of North Brazil Current rings. Space-time diagrams of sea height anomalies and residues along the altimeter groundtracks show large seasonal and interannual variability. Results presented here confirm previous estimates that indicate a shedding rate of 3 to 7 rings per year with no marked seasonal variability but with very strong year-to-year variability. Additionally, eddies not shed by the retroflection travel through the region as well. Most of the rings pass very near of Barbados, affecting the environment in the region, of which seven rings during the study period are seen to enter into the Caribbean Sea. A link is found in this study between long-term surface temperature changes in the tropical Atlantic and the number of rings shed at the NBC retroflection, where periods of time with warmer surface temperatures are associated to a higher number of rings shed.
AB - Ten years of altimeter data are used in conjunction with temperature and salinity data within a two-layer reduced gravity approximation to investigate the shedding and translation of North Brazil Current rings. Space-time diagrams of sea height anomalies and residues along the altimeter groundtracks show large seasonal and interannual variability. Results presented here confirm previous estimates that indicate a shedding rate of 3 to 7 rings per year with no marked seasonal variability but with very strong year-to-year variability. Additionally, eddies not shed by the retroflection travel through the region as well. Most of the rings pass very near of Barbados, affecting the environment in the region, of which seven rings during the study period are seen to enter into the Caribbean Sea. A link is found in this study between long-term surface temperature changes in the tropical Atlantic and the number of rings shed at the NBC retroflection, where periods of time with warmer surface temperatures are associated to a higher number of rings shed.
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UR - http://www.scopus.com/inward/citedby.url?scp=77956752174&partnerID=8YFLogxK
U2 - 10.1016/S0422-9894(03)80153-8
DO - 10.1016/S0422-9894(03)80153-8
M3 - Article
VL - 68
SP - 335
EP - 356
JO - Elsevier Oceanography Series
JF - Elsevier Oceanography Series
SN - 0422-9894
IS - C
ER -