@article{fdi:010077620,
  title = {{I}mpact of the equatorial deep jets on estimates of zonal transports in the {A}tlantic},
  author = {{S}chmid, {C}. and {B}ourl{\`e}s, {B}ernard and {G}ouriou, {Y}ves},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he structure and variability of the zonal equatorial flow in the {A}tlantic is studied on the basis of velocity profiles obtained with lowered {A}coustic {D}oppler {C}urrent {P}rofilers during multiple surveys. {T}he vertical extent of the zonal currents is found to vary considerably. {I}t can be as small as 100 m or as large as 1000 m. {I}n the {A}tlantic, vertical scales of 400-600 m have been associated with the equatorial deep jets (they are also frequently called deep jets or stacked jets). {T}ypical amplitudes of the zonal velocity are about 20 cm s(-1). {A}n analysis of quasi-synoptic surveys indicates that the zonal extent of most jets is likely to be at least 27&{DEG};. {T}hey can rise or deepen from west to east, although the deepening was observed more often and is often more pronounced. {T}he west to east deepening can be as large as 320 m/10&{DEG};. {B}asin-wide mean depth changes of the jets are mostly on the order of 50 m/10&{DEG};, and the largest depth changes are typically observed between 35&{DEG}; and 23&{DEG}; {W}. {T}he existence of these changes indicates that vertically propagating, equatorially trapped, waves might be one cause for the jet structure. {H}owever, the dependence of the slope on the longitude indicates that other processes must be involved as well. {T}he typical vertical extent of the jets is small enough to result in several direction changes of the zonal flow in the {A}ntarctic {I}ntermediate {W}ater ({AAIW}) and the {N}orth {A}tlantic {D}eep {W}ater ({NADW}) layer. {F}rom transport estimates for 14 meridional sections it is found that the transport for the westward component of the flow within the {AAIW} layer (500-1000 m) can be as large as -24 {S}v (1 {S}v = 10(6) {M}, s(-1)) within 1&{DEG}; of the equator. {F}or the eastward component of the flow in the {AAIW} layer the transport can be as large as 8 {S}v. {A}dding the transport components for each section results in a range of total {AAIW} transports from -24 to 7 {S}v. {T}his suggest that the annual mean transport of {AAIW} is westward. {T}he only months with eastward total transports are {J}une and {J}uly. {T}his is consistent with earlier {L}agrangian and some other observations that indicated that the {AAIW} flow along the equator is governed by an annual cycle. {I}n the {NADW} layer (1200-3900 m) the transport for the westward (eastward) flow can be as large as -25 {S}v (23 {S}v) within 1&{DEG}; of the equator. {T}his results in a range of total {NADW} transports from -10 to 18 {S}v. {T}he variations of the total transports of {AAIW} and {NADW} are anti-correlated, with a correlation coefficient of -0.86. {S}ince only eight sections reached deep enough to allow transport estimates in the {NADW} layer it is more difficult to come to a conclusion about the mean transport in this layer than for the transport in the {AAIW} layer (for the latter layer 14 sections were available). {N}evertheless, the obtained estimates suggest that the total {NADW} transport may be eastward.},
  keywords = {{ATLANTIQUE}},
  booktitle = {},
  journal = {{D}eep {S}ea {R}esearch {P}art {II}. {T}opical {S}tudies in {O}ceanography},
  volume = {52},
  numero = {3-4},
  pages = {409--428},
  ISSN = {0967-0645},
  year = {2005},
  DOI = {10.1016/j.dsr2.2004.12.008},
  URL = {https://www.documentation.ird.fr/hor/fdi:010077620},
}