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{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,1,16]],"date-time":"2024-01-16T15:19:33Z","timestamp":1705418373043},"reference-count":65,"publisher":"Copernicus GmbH","issue":"12","license":[{"start":{"date-parts":[[2023,6,23]],"date-time":"2023-06-23T00:00:00Z","timestamp":1687478400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","award":["268020496"]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Atmos. Chem. Phys."],"abstract":"<jats:p>Abstract. This study analyses the cloud radiative effect (CRE) obtained from near-surface observations of three airborne campaigns in the Arctic north-west of Svalbard: Airborne measurements of radiative and turbulent FLUXes of energy and momentum in the Arctic boundary layer (AFLUX, March\/April 2019), Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD, May\/June 2017), and Multidisciplinary drifting Observatory for the Study of Arctic Climate\u00a0\u2013 Airborne observations in the Central Arctic (MOSAiC-ACA, August\/September 2020). The surface CRE quantifies the potential of clouds to modify the radiative energy budget at the surface and is calculated by combining broadband radiation measurements during low-level flight sections in mostly cloudy conditions with radiative transfer simulations of cloud-free conditions. The significance of surface albedo changes due to the presence of clouds is demonstrated, and this effect is considered in the cloud-free simulations. The observations are discussed with respect to differences of the CRE between sea ice and open-ocean surfaces and between the seasonally different campaigns. The results indicate that the CRE depends on cloud, illumination, surface, and thermodynamic properties. The solar and thermal-infrared (TIR) components of the CRE, CREsol and CRETIR, are analysed separately, as well as combined for the study of the total CRE (CREtot). The inter-campaign differences of CREsol are dominated by the seasonal cycle of the solar zenith angle, with the strongest cooling effect in summer. The lower surface albedo causes a stronger solar cooling effect over open ocean than over sea ice, which amounts to\u00a0\u2212259\u2009W\u2009m\u22122 (\u2212108\u2009W\u2009m\u22122) and\u00a0\u221265\u2009W\u2009m\u22122 (\u221217\u2009W\u2009m\u22122), respectively, during summer (spring). Independent of campaign and surface type, CRETIR is only weakly variable and shows values around\u00a075\u2009W\u2009m\u22122. In total, clouds show a negative CREtot over open ocean during all campaigns. In contrast, over sea ice, the positive CREtot suggests a warming effect of clouds at the surface, which neutralizes during mid-summer. Given the seasonal cycle of the sea ice distribution, these results imply that clouds in the Fram Strait region cool the surface during the sea ice minimum in late summer, while they warm the surface during the sea ice maximum in spring.<\/jats:p>","DOI":"10.5194\/acp-23-7015-2023","type":"journal-article","created":{"date-parts":[[2023,6,24]],"date-time":"2023-06-24T08:58:35Z","timestamp":1687597115000},"page":"7015-7031","source":"Crossref","is-referenced-by-count":1,"title":["Airborne observations of the surface cloud radiative effect during different seasons over sea ice and open ocean in the Fram Strait"],"prefix":"10.5194","volume":"23","author":[{"given":"Sebastian","family":"Becker","sequence":"first","affiliation":[]},{"ORCID":"http:\/\/orcid.org\/0000-0003-0860-8216","authenticated-orcid":false,"given":"Andr\u00e9","family":"Ehrlich","sequence":"additional","affiliation":[]},{"ORCID":"http:\/\/orcid.org\/0000-0003-1896-1574","authenticated-orcid":false,"given":"Michael","family":"Sch\u00e4fer","sequence":"additional","affiliation":[]},{"ORCID":"http:\/\/orcid.org\/0000-0002-4652-5561","authenticated-orcid":false,"given":"Manfred","family":"Wendisch","sequence":"additional","affiliation":[]}],"member":"3145","published-online":{"date-parts":[[2023,6,23]]},"reference":[{"key":"ref1","doi-asserted-by":"crossref","unstructured":"Allan, R. 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