dc.contributor.author | Mukhopadhyay, S. | |
dc.contributor.author | Shankar, D. | |
dc.contributor.author | Aparna, S.G. | |
dc.contributor.author | Mukherjee, A. | |
dc.contributor.author | Fernando, V. | |
dc.contributor.author | Kankonkar, A. | |
dc.contributor.author | Khalap, S. | |
dc.contributor.author | Satelkar, N.P. | |
dc.contributor.author | Gaonkar, M.G. | |
dc.contributor.author | Tari, A.P. | |
dc.contributor.author | Khedekar, R.R. | |
dc.contributor.author | Ghatkar, S. | |
dc.date.accessioned | 2020-03-31 | |
dc.date.accessioned | 2021-02-09T10:13:22Z | |
dc.date.available | 2020-02-20 | |
dc.date.available | 2021-02-09T10:13:22Z | |
dc.date.issued | 2020 | |
dc.identifier.citation | Journal of Earth System Science, vol.129(1); 2020; Article no: 77 | |
dc.identifier.issn | 0973774X | |
dc.identifier.other | https://link.springer.com/article/10.1007/s12040-020-1346-8 | |
dc.identifier.uri | https://doi.org/10.1007/s12040-020-1346-8 | |
dc.identifier.uri | http://drs.nio.org/drs/handle/2264/8546 | |
dc.description | IF2018 - 1.104 | |
dc.description.abstract | We describe the variability of the East India Coastal Current (EICC) during 2009-2018 using data from ADCP (acoustic Doppler current profiler) moorings deployed on the continental slope in the western Bay of Bengal. The four moorings are deployed off Gopalpur (~ 19. 5 ◦N), Visakhapatnam (~ 18 ◦N), Kakinada (~ 16 ◦N), and Cuddalore (~ 12 ◦N) on the Indian east coast. The longer data record allows us to attach a statistically more robust basis to the conclusions drawn by Mukherjee et al. (2014) on the basis of four years (2009-2013) of ADCP data. The data confirm that the seasonal cycle dominates the variability of the EICC. The amplitude of the annual band varies over the time series. In the intra-annual band, the variability switches between the semi-annual and 120-day bands off Gopalpur, Visakhapatnam and Kakinada, but the semi-annual band is stronger than the 120-day band off Cuddalore throughout the time series. Upward phase propagation is common in the seasonal bands, but downward phase propagation is common in the intra-annual band off Cuddalore during the summer and winter monsoons, leading to stronger undercurrents there. Off Cuddalore, even the annual EICC appears as a shallow current. In contrast, the EICC appears as a deep flow off Gopalpur, Visakhapatnam, and Kakinada particularly during the spring inter-monsoon. This deep flow is evident at these locations even in the intraseasonal (30-90-day) band; the longer data set suggests, however, that the intraseasonal variability does not necessarily peak during spring. The annual EICC is coherent along the coast, but it is only the semi-annual band that shows a comparable coherence between Kakinada and Cuddalore: in the 120-day and intraseasonal bands, the EICC decorrelates along the coast. Wavelet analysis suggests significant variability at sub-annual periods. The sub-annual EICC exceeds 20cms-1 on many occasions, but it too decorrelates along the coast. The long ADCP record allows us to confirm the dominance of seasonality in the EICC regime in a robust fashion; the data show that the EICC tends to flow in its canonical poleward (equatorward) direction during spring (winter). This dominance of seasonality enhances the predictability of the EICC. | |
dc.language | en | |
dc.publisher | Springer | |
dc.relation.ispartof | J Earth Syst Sci | |
dc.relation.isreferencedby | SCI | |
dc.rights | Only the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations | |
dc.title | Observed variability of the East India Coastal Current on the continental slope during 2009-2018 | |
dc.type | Journal Article | |
dc.affiliation.author | CSIR-National Institute of Oceanography, Dona Paula, Goa, India | |