Radiative energy budget and cloud radiative forcing in the daytime marginal sea ice zone during Arctic spring and summer

Airborne measurements of the surface radiative energy budget (REB) collected in the area of the marginal sea ice zone (MIZ) close to Svalbard (Norway) during two campaigns conducted in early spring and and early summer are presented. From the data, the cloud radiative forcing was derived. The analys...

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Main Authors: Stapf, Johannes, Ehrlich, André, Lüpkes, Christof, Wendisch, Manfred
Format: Text
Language:English
Published: 2021
Subjects:
Online Access:https://doi.org/10.5194/acp-2021-279
https://acp.copernicus.org/preprints/acp-2021-279/
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spelling ftcopernicus:oai:publications.copernicus.org:acpd93855 2023-05-15T15:00:26+02:00 Radiative energy budget and cloud radiative forcing in the daytime marginal sea ice zone during Arctic spring and summer Stapf, Johannes Ehrlich, André Lüpkes, Christof Wendisch, Manfred 2021-04-26 application/pdf https://doi.org/10.5194/acp-2021-279 https://acp.copernicus.org/preprints/acp-2021-279/ eng eng doi:10.5194/acp-2021-279 https://acp.copernicus.org/preprints/acp-2021-279/ eISSN: 1680-7324 Text 2021 ftcopernicus https://doi.org/10.5194/acp-2021-279 2021-05-03T16:22:15Z Airborne measurements of the surface radiative energy budget (REB) collected in the area of the marginal sea ice zone (MIZ) close to Svalbard (Norway) during two campaigns conducted in early spring and and early summer are presented. From the data, the cloud radiative forcing was derived. The analysis is focussed on the impact of changing atmospheric thermodynamic conditions on the REB and on the linkage of sea ice properties and cloud radiative forcing (CRF). The observed two-mode longwave net irradiance frequency distributions above sea ice are compared with measurements from previous studies. The transition of both states (cloudy and cloud-free) from winter towards summer and the associated broadening of the modes is discussed as a function of the seasonal thermodynamic profiles and the surface type. The influence of cold air outbreaks (CAO) and warm air intrusions on the REB is illustrated for several case studies, whereby the source and sink terms of REB in the evolving CAO boundary layer are quantified. Furthermore, the role of thermodynamic profiles and the vertical location of clouds during on-ice flow is illustrated. The sea ice concentration was identified as the main driver of the shortwave cooling by the clouds. The longwave warming of clouds, estimated to about 75 W m −2 , seems to be representative for this region, as compared to other studies. Simplified radiative transfer simulations of the frequently observed low-level boundary layer clouds and average thermodynamic profiles represent the observed radiative quantities fairly well. The simulations illustrate the delicate interplay of surface and cloud properties that modify the REB and CRF, and the challenges in quantifying trends in the Arctic REB induced by potential changes of the cloud optical thickness. Text Arctic Sea ice Svalbard Copernicus Publications: E-Journals Arctic Norway Svalbard
institution Open Polar
collection Copernicus Publications: E-Journals
op_collection_id ftcopernicus
language English
description Airborne measurements of the surface radiative energy budget (REB) collected in the area of the marginal sea ice zone (MIZ) close to Svalbard (Norway) during two campaigns conducted in early spring and and early summer are presented. From the data, the cloud radiative forcing was derived. The analysis is focussed on the impact of changing atmospheric thermodynamic conditions on the REB and on the linkage of sea ice properties and cloud radiative forcing (CRF). The observed two-mode longwave net irradiance frequency distributions above sea ice are compared with measurements from previous studies. The transition of both states (cloudy and cloud-free) from winter towards summer and the associated broadening of the modes is discussed as a function of the seasonal thermodynamic profiles and the surface type. The influence of cold air outbreaks (CAO) and warm air intrusions on the REB is illustrated for several case studies, whereby the source and sink terms of REB in the evolving CAO boundary layer are quantified. Furthermore, the role of thermodynamic profiles and the vertical location of clouds during on-ice flow is illustrated. The sea ice concentration was identified as the main driver of the shortwave cooling by the clouds. The longwave warming of clouds, estimated to about 75 W m −2 , seems to be representative for this region, as compared to other studies. Simplified radiative transfer simulations of the frequently observed low-level boundary layer clouds and average thermodynamic profiles represent the observed radiative quantities fairly well. The simulations illustrate the delicate interplay of surface and cloud properties that modify the REB and CRF, and the challenges in quantifying trends in the Arctic REB induced by potential changes of the cloud optical thickness.
format Text
author Stapf, Johannes
Ehrlich, André
Lüpkes, Christof
Wendisch, Manfred
spellingShingle Stapf, Johannes
Ehrlich, André
Lüpkes, Christof
Wendisch, Manfred
Radiative energy budget and cloud radiative forcing in the daytime marginal sea ice zone during Arctic spring and summer
author_facet Stapf, Johannes
Ehrlich, André
Lüpkes, Christof
Wendisch, Manfred
author_sort Stapf, Johannes
title Radiative energy budget and cloud radiative forcing in the daytime marginal sea ice zone during Arctic spring and summer
title_short Radiative energy budget and cloud radiative forcing in the daytime marginal sea ice zone during Arctic spring and summer
title_full Radiative energy budget and cloud radiative forcing in the daytime marginal sea ice zone during Arctic spring and summer
title_fullStr Radiative energy budget and cloud radiative forcing in the daytime marginal sea ice zone during Arctic spring and summer
title_full_unstemmed Radiative energy budget and cloud radiative forcing in the daytime marginal sea ice zone during Arctic spring and summer
title_sort radiative energy budget and cloud radiative forcing in the daytime marginal sea ice zone during arctic spring and summer
publishDate 2021
url https://doi.org/10.5194/acp-2021-279
https://acp.copernicus.org/preprints/acp-2021-279/
geographic Arctic
Norway
Svalbard
geographic_facet Arctic
Norway
Svalbard
genre Arctic
Sea ice
Svalbard
genre_facet Arctic
Sea ice
Svalbard
op_source eISSN: 1680-7324
op_relation doi:10.5194/acp-2021-279
https://acp.copernicus.org/preprints/acp-2021-279/
op_doi https://doi.org/10.5194/acp-2021-279
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