2016年11月
Eddies Observed by Argo Floats. Part I: Eddy Transport in the Upper 1000dbar
JOURNAL OF PHYSICAL OCEANOGRAPHY
- 巻
- 46
- 号
- 11
- 開始ページ
- 3471
- 終了ページ
- 3486
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1175/JPO-D-16-0150.1
- 出版者・発行元
- AMER METEOROLOGICAL SOC
Argo floats measure horizontal current velocities at the parking depth and vertical profiles of temperature and salinity. The data are sufficient for simultaneous estimates of velocities and vertical displacements of isopycnal surfaces. More than 980 000 pairs of observations of current velocity and water column stratification were used to calculate eddy transport above 1000 dbar and its uncertainty based on the temporal-residualmean framework. Eddy transports larger than 1.0 m(2) s(-1) were found in the North Atlantic, western North Pacific, and Southern Oceans. The eddy transport T had components perpendicular T-perpendicular to and parallel T-parallel to to the density contours at 1000 dbar. In the midlatitude oceans, eddy transport was weaker (<0.5 m(2) s(-1)), mostly perpendicular to the density contours, and equatorward. Alarge area of northward T-perpendicular to was found in the south Indian Ocean; analysis of velocity and thickness perturbations suggested that this transport was a northward intrusion of Antarctic Intermediate Water. In the midlatitude oceans and in most of the southern part of the Antarctic Circumpolar Current (ACC), T-perpendicular to was generally upgradient in density on 1000 dbar. Downgradient T-perpendicular to was found along the North Atlantic Current and Kuroshio Extension as well as in the northern part of the ACC. Zonally integrated meridional transport was poleward at latitudes higher than approximately 40 degrees and equatorward at lower latitudes. The quasi-Stokes or Gent-McWilliams diffusivity coefficient was on the order of 1000 m(2) s(-1) but was associated with such large uncertainty that it was statistically indistinguishable from zero, except at midlatitudes in the Southern Hemisphere.
- リンク情報
- ID情報
-
- DOI : 10.1175/JPO-D-16-0150.1
- ISSN : 0022-3670
- eISSN : 1520-0485
- Web of Science ID : WOS:000389036600013