On the Variability of Antarctic Circumpolar Current Fronts Inferred from 1992–2011 Altimetry

Date 2014-12-15
Author(s) Kim Yong SunORCID1, Orsi Alejandro2
Affiliation(s) 1 : Korea Institute of Ocean Science and Technology, Busan, Rep of Korea
2 : Texas A&M University, College Station, USA
DOI 10.17882/70980
Publisher SEANOE
Keyword(s) Antarctic Circumpolar Current (ACC), Fronts, Altimetry, ENSO, SAM, Climate Change
Abstract

Antarctic Circumpolar Current (ACC) fronts, defined as water mass boundaries, have been known to respond to large-scale atmospheric variabilities, especially the Southern Hemisphere annular mode (SAM) and El Niño–Southern Oscillation (ENSO). Distinct patterns of localized variability in meridional front displacements during 1992–2011 are derived from the analysis of satellite sea surface height data. Major basin-scale differences are found between the southeast Pacific (150–90W) and the southeast Indian (75–150E) sectors of the ACC. Frontal positions in the southeast Pacific show large year-to-year meridional fluctuations, attributed mostly to ENSO and in part SAM, and no apparent seasonal cycles or long-term trends. In contrast, summer (winter) frontal locations in the southeast Indian extend farther to the south (north) of their long- term mean distribution. A southward drift of ACC fronts is indicated over the Indian sector during the past two decades. This long-term shift is not directly related to the atmospheric variabilities, but this is most likely in response to changes in large-scale ocean circulation, in particular to the poleward expansion of the Indian subtropical gyre. The existence of these localized, contrasting variability patterns suggests that a circumpolar- averaging analysis could possibly smooth out a local climate signal, with an emphasis on a basin-scale investigation for climate studies in the Southern Ocean.

Licence CC-BY-NC-ND
Sensor metadata

Absolute SSH based on MDT_CNES_CLS09

Data
File Size Format Processing Access
ACC fronts inferred from altimetry in Kim and Orsi (2014) 264 KB XLS, XLSX Processed data Open access
Top of the page

How to cite 

Kim Yong Sun, Orsi Alejandro (2014). On the Variability of Antarctic Circumpolar Current Fronts Inferred from 1992–2011 Altimetry. SEANOE. https://doi.org/10.17882/70980


In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :


Kim Yong Sun, Orsi Alejandro H. (2014). On the Variability of Antarctic Circumpolar Current Fronts Inferred from 1992–2011 Altimetry. Journal of Physical Oceanography, 44(12), 3054-3071. https://doi.org/10.1175/JPO-D-13-0217.1