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{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,11,21]],"date-time":"2023-11-21T00:15:06Z","timestamp":1700525706306},"reference-count":71,"publisher":"University of California Press","issue":"1","license":[{"start":{"date-parts":[[2023,11,20]],"date-time":"2023-11-20T00:00:00Z","timestamp":1700438400000},"content-version":"vor","delay-in-days":323,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,11,20]]},"abstract":"<jats:p>During marine cold air outbreaks (MCAOs), cold and dry Arctic air masses are transported from the central Arctic southward across the closed sea ice and much warmer open oceans. They experience significant transformations including a rapid heating and moistening, often leading to cloud formation. While intense wintertime MCAOs have been analyzed widely, the air mass transformations during other seasons have been studied sparsely. We address this gap by investigating an MCAO case observed in September 2020. To study the transformation processes, we combine the fifth generation of atmospheric reanalyses of the global climate (ERA5), trajectory calculations, as well as shipborne and airborne measurements. In the central Arctic, observations acquired from aboard the research vessel (RV) Polarstern during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition characterized the initial state of the air mass over closed sea ice. Trajectories indicated the pathway the air mass took from RV Polarstern southward to the Fram Strait. For the first 24 h of the southbound drift, the air masses remained quasi-stationary. Then, still 15 h ahead of the marginal sea ice zone, differential advection across the boundary layer flow introduced humidity and clouds at higher altitudes between 1.5 and 2.5 km. ERA5-derived temperature and humidity tendencies indicated complex vertical interactions. Radiative cloud-top cooling, entrainment, and turbulence were significantly reduced in the lower and enhanced in the upper advected cloud layer. Eventually, the lower cloud deck dissipated. After this confluence of 2 different air masses, observations gathered by Polar 5 in Fram Strait as part of the MOSAiC Airborne observations in the Central Arctic campaign revealed cloudy, moist layers throughout the lowest 3.5 km and an increasing boundary layer height. Comparing the initial with the final state 48 h later, the largest net heating of +8 K was found close to the surface, yet the largest net moistening of +2.5 g kg\u22121 at an altitude of 1 km, as the initial profile was exceptionally dry here. We conclude that the observed air mass transformations were driven by the surface changes from sea ice to open ocean but additionally strongly impacted by the differential advection of clouds and moisture across the near-surface MCAO flow.<\/jats:p>","DOI":"10.1525\/elementa.2023.00079","type":"journal-article","created":{"date-parts":[[2023,11,20]],"date-time":"2023-11-20T21:13:46Z","timestamp":1700514826000},"source":"Crossref","is-referenced-by-count":0,"title":["Analysis of an Arctic cold air outbreak during autumn and related air mass transformations forced by surface changes and advection in higher altitudes"],"prefix":"10.1525","volume":"11","author":[{"ORCID":"http:\/\/orcid.org\/0000-0002-8824-2244","authenticated-orcid":false,"given":"Benjamin","family":"Kirbus","sequence":"first","affiliation":[{"name":"1Leipzig Institute for Meteorology, Leipzig University, Leipzig, Germany"}]},{"given":"Jan","family":"Chylik","sequence":"additional","affiliation":[{"name":"2Institute for Geophysics and Meteorology, University of Cologne, Cologne, Germany"}]},{"given":"Andr\u00e9","family":"Ehrlich","sequence":"additional","affiliation":[{"name":"1Leipzig Institute for Meteorology, Leipzig University, Leipzig, Germany"}]},{"given":"Sebastian","family":"Becker","sequence":"additional","affiliation":[{"name":"1Leipzig Institute for Meteorology, Leipzig University, Leipzig, Germany"}]},{"given":"Michael","family":"Sch\u00e4fer","sequence":"additional","affiliation":[{"name":"1Leipzig Institute for Meteorology, Leipzig University, Leipzig, Germany"}]},{"given":"Roel","family":"Neggers","sequence":"additional","affiliation":[{"name":"2Institute for Geophysics and Meteorology, University of Cologne, Cologne, Germany"}]},{"given":"Manfred","family":"Wendisch","sequence":"additional","affiliation":[{"name":"1Leipzig Institute for Meteorology, Leipzig University, Leipzig, Germany"}]}],"member":"408","reference":[{"key":"2023112021132148800_ref1","doi-asserted-by":"crossref","unstructured":"Ali, SM, Pithan, F.2020. 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