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Jenny V. Turton, Thomas Mölg, and Dirk Van As

travel between Iceland and the east coast of Greenland, leaving a fingerprint in the climate signal ( Fig. 6a ). Under low pressure conditions to the southeast of Greenland, warm, moist air is advected toward 79N from over the Atlantic. Concurrently, the warmer and moister air creates a low-level cloud or fog level, which additionally warms the surface and air because of an increased downward flux of longwave radiation to the surface ( Bednorz and Fortuniak 2012 ). We hypothesize that a combination

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Christopher S. Bretherton, Isabel L. McCoy, Johannes Mohrmann, Robert Wood, Virendra Ghate, Andrew Gettelman, Charles G. Bardeen, Bruce A. Albrecht, and Paquita Zuidema

. Some CSET westbound flights encountered very shallow PBLs with cloud tops less than 400 m at the start of their low-level sampling. Cloud bases could occasionally be less than 200 m there, even though fog was not encountered. Farther to the west, cloud is spread over a wide range of altitudes between 500 m and the mean inversion base. There is still some stratiform cloud (e.g., see Wood et al. 2018 ; A19 ), but it is thin and the weak inversion fluctuates in altitude such that a preferred

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