A new state-dependent parameterization for the free drift of sea ice
نویسندگان
چکیده
Abstract. Free-drift estimates of sea ice motion are necessary to produce a seamless observational record combining buoy and satellite-derived vectors. We develop new parameterization for the free drift based on wind forcing, turning angle, state variables (thickness concentration), ocean currents. Given fact that spatial distribution wind–ice–ocean transfer coefficient has similar structure thickness, we take standard free-drift equation introduce scales linearly with thickness. Results show mean bias error −0.5 cm s−1 (low-speed bias) root-mean-square 5.1 s−1, considering daily data as truth. This represents 35 % reduction speed compared used in Polar Pathfinder dataset (Tschudi et al., 2019b). The thickness-dependent provides an improved seasonality long-term trend speed, minimum (maximum) May (October), July (January) constant parameterizations which simply follow peak surface stresses. Over 1979–2019 period, this model is +0.45 per decade +0.39 from observations, whereas there essentially no (−0.09 decade) or input (−0.01 decade). optimal angle obtained least-squares fitting 25∘, resulting +3 42∘ direction drift, respectively. current minimization procedure resolve key large-scale features such Beaufort Gyre Transpolar Drift Stream good agreement ECCO, GLORYS, PIOMAS ice–ocean reanalyses, well geostrophic currents dynamical topography, difference 2.4, 2.9, 2.6, 3.8 Finally, repeat analysis two sub-sections time series (pre- post-2000) clearly shows acceleration (particularly along Alaskan coastline) expansion gyre post-2000s, concurrent thinning cover observed publicly available complementing merged observation-based datasets include satellite records.
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ژورنال
عنوان ژورنال: The Cryosphere
سال: 2022
ISSN: ['1994-0424', '1994-0416']
DOI: https://doi.org/10.5194/tc-16-533-2022