<p>From reading the literature on the subject, my impression is that we don't know that much on the subject, primarily due to a scarcity of measurements. My understanding is that the first and only year-long time-series was made at the Drake Passage in 1979 (e. g. <strong><a href="http://journals.ametsoc.org/doi/pdf/10.1175/1520-0485%281985%29015%3C0810%3AVTOTAC%3E2.0.CO%3B2" rel="nofollow">Whitworth &amp; Peterson, 1985</a></strong>) by the ISOS programme (International Southern Ocean Studies). In addition to that NOAA's WOCE (World Ocean Circulation Experiment) added yearly data from 1990 to 2002.</p>

<p>According to <strong><a href="http://onlinelibrary.wiley.com/doi/10.1029/2000JC900107/abstract" rel="nofollow">Rintoul &amp; Sokolov 2001</a></strong> and <strong><a href="http://epic.awi.de/2649/1/Rin8888b.pdf" rel="nofollow">Rintoul et al. 2001</a></strong>, most of the variability south of Tasmania is due to changes in currents north of the ACC itself. 
<strong><a href="http://dx.doi.org/10.1029/2001JC001147" rel="nofollow">Cunningham et al. 2003</a></strong> show that the moderate interannual variation in baroclinic transport they observed seem to be coeval with variations in the location of the Polar Front (it moves north or south on a 90km range). But overall the variability seems to be relatively low, and the ACC relatively steady.</p>

<p><strong><a href="http://www.ccpo.odu.edu/~klinck/Reprints/PDF/whiteNature96.pdf" rel="nofollow">White &amp; Peterson, 1996</a></strong> showed an interesting phenomenon that they called the Antarctic Circumpolar Wave: it is a "wave" in the ACC circling the globe in ca. 8 yrs with a period of 4yrs at any location and it is defined by anomalies in sea-suface temperature, sea-level pressure and sea-ice extent. However no evidence for corresponding anomalies in volume transport was showed, to my knowledge. </p>

<p>So, to summarize, as far as I can see:  </p>

<ul>
<li>not enough data for seasonal trends (only one yearlong time-series);</li>
<li>some interannual variability (possibly as a consequence of variabilities in other water masses); </li>
<li>not enough data to study decadal variation.</li>
</ul>

CC BY-SA 3.0
2015-02-24T08:38:59.873Z
2015-02-24T09:19:04.620Z
2015-02-24T09:19:04.620Z
plannapus
<p>The Antarctic Circumpolar Current (ACC), the oceanic current that flows around the Antarctic continent, has many links to weather and climate processes (e.g., <a href="https://earthscience.stackexchange.com/questions/3201/is-there-conclusive-evidence-for-the-antarctic-circumpolar-current-developing-af">Is there conclusive evidence for the Antarctic Circumpolar Current developing after the glaciation of Antarctica?</a>).
My question is how has the total transport of the current changed in time at different time scales? Clearly, it has changed since its potential formation in the late Miocene. My interest is in both short time scales (seasonal), decadal (e.g., ENSO effects) and longer time scales.</p>

<ocean><oceanography><ocean-currents><antarctic>
How much has the total transport of the Antarctic Circumpolar Current changed over time?
arkaia
# How much has the total transport of the Antarctic Circumpolar Current changed over time?

(Asked by: username_0 on 2015-01-15)

The Antarctic Circumpolar Current (ACC), the oceanic current that flows around the Antarctic continent, has many links to weather and climate processes (e.g., [Is there conclusive evidence for the Antarctic Circumpolar Current developing after the glaciation of Antarctica?](https://earthscience.stackexchange.com/questions/3201/is-there-conclusive-evidence-for-the-antarctic-circumpolar-current-developing-af)).
My question is how has the total transport of the current changed in time at different time scales? Clearly, it has changed since its potential formation in the late Miocene. My interest is in both short time scales (seasonal), decadal (e.g., ENSO effects) and longer time scales.

**Tags:** ocean, oceanography, ocean-currents, antarctic


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## 1 answers

### Answer by username_1 on 2015-02-24. Score: 2 | Accepted answer

From reading the literature on the subject, my impression is that we don't know that much on the subject, primarily due to a scarcity of measurements. My understanding is that the first and only year-long time-series was made at the Drake Passage in 1979 (e. g. **[Whitworth & Peterson, 1985](http://journals.ametsoc.org/doi/pdf/10.1175/1520-0485%281985%29015%3C0810%3AVTOTAC%3E2.0.CO%3B2)**) by the ISOS programme (International Southern Ocean Studies). In addition to that NOAA's WOCE (World Ocean Circulation Experiment) added yearly data from 1990 to 2002.

According to **[Rintoul & Sokolov 2001](http://onlinelibrary.wiley.com/doi/10.1029/2000JC900107/abstract)** and **[Rintoul et al. 2001](http://epic.awi.de/2649/1/Rin8888b.pdf)**, most of the variability south of Tasmania is due to changes in currents north of the ACC itself.
**[Cunningham et al. 2003](http://dx.doi.org/10.1029/2001JC001147)** show that the moderate interannual variation in baroclinic transport they observed seem to be coeval with variations in the location of the Polar Front (it moves north or south on a 90km range). But overall the variability seems to be relatively low, and the ACC relatively steady.

**[White & Peterson, 1996](http://www.ccpo.odu.edu/~klinck/Reprints/PDF/whiteNature96.pdf)** showed an interesting phenomenon that they called the Antarctic Circumpolar Wave: it is a "wave" in the ACC circling the globe in ca. 8 yrs with a period of 4yrs at any location and it is defined by anomalies in sea-suface temperature, sea-level pressure and sea-ice extent. However no evidence for corresponding anomalies in volume transport was showed, to my knowledge.

So, to summarize, as far as I can see:

* not enough data for seasonal trends (only one yearlong time-series);
* some interannual variability (possibly as a consequence of variabilities in other water masses);
* not enough data to study decadal variation.


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