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Ice retreat in the eastern Eurasian Arctic is a consequence of\udatmospheric and oceanic processes and regional feedback mechanisms acting on\udthe ice cover, both in winter and summer. A correct representation of these\udprocesses in numerical models is important, since it will improve predictions\udof sea ice anomalies along the Northeast Passage and beyond. In this study,\udwe highlight the importance of winter ice dynamics for local summer sea ice\udanomalies in thickness, volume and extent. By means of airborne sea ice\udthickness surveys made over pack ice areas in the south-eastern Laptev Sea,\udwe show that years of offshore-directed sea ice transport have a thinning\udeffect on the late-winter sea ice cover. To confirm the preconditioning\udeffect of enhanced offshore advection in late winter on the summer sea ice\udcover, we perform a sensitivity study using a numerical model. Results verify\udthat the preconditioning effect plays a bigger role for the regional ice\udextent. Furthermore, they indicate an increase in volume export from the\udLaptev Sea as a consequence of enhanced offshore advection, which has\udfar-reaching consequences for the entire Arctic sea ice mass balance.\udMoreover we show that ice dynamics in winter not only preconditions local\udsummer ice extent, but also accelerate fast-ice decay

Winter sea ice export from the Laptev Sea preconditions the local summer sea ice cover and fast ice decay