Stream-coordinate structure of oceanic jets based on merged altimeter data |
| |
Authors: | Che Sun Linlin Zhang Xiaomei Yan |
| |
Affiliation: | SUN Che 1,ZHANG Linlin 1,2,YAN Xiaomei 1,2 1 Key Laboratory of Ocean Circulation and Wave,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China 2 Graduate University of Chinese Academy of Sciences,Beijing 100039,China |
| |
Abstract: | The jet structure of the Southern Ocean front south of Australia is studied in stream-coordinate with a new altimeter product—Absolute Dynamic Topography (ADT) from AVISO. The accuracy of the ADT data is validated with the mooring data from a two-year subantarctic-front experiment. It is demonstrated that the ADT is consistent with in-situ measurements and captures the meso-scale activity of the Antarctic Circumpolar Current (ACC). Stream-coordinate analysis of ADT surface geostrophic flows finds that ACC jets exhibit large spatio-temporal variability and do not correspond to particular streamfunction values. In the circumpolar scope ACC jets display a transient fragmented pattern controlled by topographic features. The poleward shift of jet in streamfunction space, as revealed by a streamwise correlation method, indicates the presence of meridional fluxes of zonal momentum. Such cross-stream eddy fluxes concentrate the broad ACC baroclinic flow into narrow jets. Combined with a recent discovery of gravest empirical mode (GEM) in the thermohaline fields, the study clarifies the interrelationship among front, jet and streamfunction in the Southern Ocean. |
| |
Keywords: | oceanic jet stream-coordinate Absolute Dynamic Topography (ADT) gravest empirical mode (GEM) |
本文献已被 CNKI 万方数据 SpringerLink 等数据库收录! |
|