Zhou et al. (2022) Early winter triggering of the Maud Rise Polynya

L. Zhou, C. Heuzé, and M. Mohrmann (2022) Early winter triggering of the Maud Rise Polynya, Geophysical Research Letters, doi:10.1029/2021GL096246

What triggers the opening of large open-ocean polynyas (holes in the winter pack ice) is still debated as we do not have in-situ observations. The main motivation for our SNSA-funded project “WINDOWS” is to find signatures of upcoming polynya events in widely available remote sensing products, in order for example to re-route autonomous instruments or optimise expeditions.

In a preliminary study [13], we could predict a polynya 5-day ahead of its opening using thermal infrared. In [23], still using thermal infrared, we increased to two weeks. In this study, we use microwave-based retrievals and can predict the opening four months ahead.

We also find that the polynya opens because of both dynamics effects (anomalous wind and ocean currents’ stresses on the sea ice) and thermodynamics, notably anomalous entrainment of heat into the mixed layer.

We’re currently working on

  • estimating energy fluxes and sea ice production in polynyas, both open-ocean and coastal;
  • and improving the sea ice retrievals.

So stay tuned for more polynya results!

Download the full-text here.

2 thoughts on “Zhou et al. (2022) Early winter triggering of the Maud Rise Polynya

  1. Pingback: Research theme: Antarctic polynyas | Dr Céline Heuzé

  2. Pingback: Zhou et al. (2023) Sea Ice Production in the 2016 and 2017 Maud Rise Polynyas | Dr Céline Heuzé

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s