Petty, AA;
Tsamados, MC;
Kurtz, NT;
(2017)
Atmospheric form drag coefficients over Arctic sea ice using remotely sensed ice topography data, spring 2009-2015.
Journal of Geophysical Research: Earth Surface
, 122
(8)
pp. 1472-1490.
10.1002/2017JF004209.
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Abstract
Sea ice topography significantly impacts turbulent energy/momentum exchange, e.g., atmospheric (wind) drag, over Arctic sea ice. Unfortunately, observational estimates of this contribution to atmospheric drag variability are spatially and temporally limited. Here we present new estimates of the neutral atmospheric form drag coefficient over Arctic sea ice in early spring, using high-resolution Airborne Topographic Mapper elevation data from NASA's Operation IceBridge mission. We utilize a new three-dimensional ice topography data set and combine this with an existing parameterization scheme linking surface feature height and spacing to form drag. To be consistent with previous studies investigating form drag, we compare these results with those produced using a new linear profiling topography data set. The form drag coefficient from surface feature variability shows lower values (<0.5–1 ×10−3) in the Beaufort/Chukchi Seas, compared with higher values (>0.5–1 ×10−3) in the more deformed ice regimes of the Central Arctic (north of Greenland and the Canadian Archipelago), which increase with coastline proximity. The results show moderate interannual variability, including a strong increase in the form drag coefficient from 2013 to 2014/2015 north of the Canadian Archipelago. The form drag coefficient estimates are extrapolated across the Arctic with Advanced Scatterometer satellite radar backscatter data, further highlighting the regional/interannual drag coefficient variability. Finally, we combine the results with existing parameterizations of form drag from floe edges (a function of ice concentration) and skin drag to produce, to our knowledge, the first pan-Arctic estimates of the total neutral atmospheric drag coefficient (in early spring) from 2009 to 2015.
| Type: | Article |
|---|---|
| Title: | Atmospheric form drag coefficients over Arctic sea ice using remotely sensed ice topography data, spring 2009-2015 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/2017JF004209 |
| Publisher version: | http://doi.org/10.1002/2017JF004209 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Sea ice; Arctic; Atmospheric drag; momentum |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1570283 |
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