Analysis of the temporal–spatial changes in surface radiation budget over the Antarctic sea ice region

Abstract. Clouds play an important role in the climate system: (1) cooling Earth by reflecting incoming sunlight to space and (2) warming Earth by reducing thermal energy loss to space. Cloud radiative effects are especially important in polar regions and have the potential to significantly alter the impact of sea ice decline on the surface radiation budget. Using CERES (Clouds and the Earth's Radiant Energy System) data and 32 CMIP5 (Coupled Model Intercomparison Project) climate models, we quantify the influence of polar clouds on the radiative impact of polar sea ice variability. Our results show that the cloud short-wave cooling effect strongly influences the impact of sea ice variability on the surface radiation budget and does so in a counter-intuitive manner over the polar seas: years with less sea ice and a larger net surface radiative flux show a more negative cloud radiative effect. Our results indicate that 66±2% of this change in the net cloud radiative effect is due to the reduction in surface albedo and that the remaining 34±1 % is due to an increase in cloud cover and optical thickness. The overall cloud radiative damping effect is 56±2 % over the Antarctic and 47±3 % over the Arctic. Thus, present-day cloud properties significantly reduce the net radiative impact of sea ice loss on the Arctic and Antarctic surface radiation budgets. As a result, climate models must accurately represent present-day polar cloud properties in order to capture the surface radiation budget impact of polar sea ice loss and thus the surface albedo feedback.

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Brief communication: Antarctic sea ice gain does not compensate for increased solar absorption from Arctic ice loss

10.5194/tc-2016-279 ◽

2017 ◽

Cited By ~ 1

Author(s):

Christian Katlein ◽

Stefan Hendricks ◽

Jeffrey Key

Keyword(s):

Sea Ice ◽

Arctic Sea Ice ◽

Radiation Budget ◽

Shortwave Radiation ◽

Sea Ice Extent ◽

Solar Absorption ◽

Antarctic Sea Ice ◽

Polar Oceans ◽

Arctic Ice ◽

The Antarctic

Abstract. Here we show on the basis of the new consistent long-term observational dataset APP-x, that the observed increase of sea ice extent in the Antarctic cannot compensate for the loss of Arctic sea ice in terms of the shortwave radiation budget in the polar oceans poleward of 50° latitude. The observations show, that apart from retreating sea-ice additional effects like albedo changes and especially changing cloud coverage lead to a total increase of solar shortwave energy deposited into the polar oceans despite of the marginal increase in Antarctic winter sea ice extent.

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Towards a better surface radiation budget analysis over sea ice in the high Arctic Ocean: a comparative study between satellite, reanalysis, and local‒scale observations

Journal of Geophysical Research Atmospheres ◽

10.1029/2020jd032555 ◽

2020 ◽

Author(s):

C. Di Biagio ◽

J. Pelon ◽

Y. Blanchard ◽

L. Loyer ◽

S.R. Hudson ◽

...

Keyword(s):

Sea Ice ◽

Comparative Study ◽

Arctic Ocean ◽

High Arctic ◽

Local Scale ◽

Surface Radiation ◽

Radiation Budget ◽

Surface Radiation Budget ◽

Budget Analysis

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Sunlight, clouds, sea ice, albedo, and the radiative budget: the umbrella versus the blanket

The Cryosphere ◽

10.5194/tc-12-2159-2018 ◽

2018 ◽

Vol 12 (6) ◽

pp. 2159-2165 ◽

Cited By ~ 7

Author(s):

Donald K. Perovich

Keyword(s):

Sea Ice ◽

Surface Albedo ◽

Radiative Heat ◽

Radiation Flux ◽

Surface Radiation ◽

Radiation Budget ◽

The Arctic ◽

Net Radiation ◽

Ice Melt ◽

Surface Radiation Budget

Abstract. The surface radiation budget of the Arctic Ocean plays a central role in summer ice melt and is governed by clouds and surface albedo. I calculated the net radiation flux for a range of albedos under sunny and cloudy skies and determined the break-even value, where the net radiation is the same for cloudy and sunny skies. Break-even albedos range from 0.30 in September to 0.58 in July. For snow-covered or bare ice, sunny skies always result in less radiative heat input. In contrast, leads always have, and ponds usually have, more radiative input under sunny skies than cloudy skies. Snow-covered ice has a net radiation flux that is negative or near zero under sunny skies, resulting in radiative cooling. Areally averaged albedos for sea ice in July result in a smaller net radiation flux under cloudy skies. For May, June, August, and September, the net radiation is smaller under sunny skies.

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The regional influence of the Arctic Oscillation and Arctic Dipole on the wintertime Arctic surface radiation budget and sea ice growth

Geophysical Research Letters ◽

10.1002/2017gl073281 ◽

2017 ◽

Vol 44 (9) ◽

pp. 4341-4350 ◽

Cited By ~ 8

Author(s):

Bradley M. Hegyi ◽

Patrick C. Taylor

Keyword(s):

Sea Ice ◽

Arctic Oscillation ◽

Surface Radiation ◽

Radiation Budget ◽

The Arctic ◽

Ice Growth ◽

Surface Radiation Budget ◽

Regional Influence ◽

The Arctic Oscillation ◽

Arctic Surface

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Sunlight, Clouds, Sea Ice and Albedo: The Umbrella Versus the Blanket

10.5194/tc-2018-47 ◽

2018 ◽

Author(s):

Donald K. Perovich

Keyword(s):

Sea Ice ◽

Surface Albedo ◽

Radiative Heat ◽

Radiation Flux ◽

The Other ◽

Surface Radiation ◽

Radiation Budget ◽

Net Radiation ◽

Ice Melt ◽

Surface Radiation Budget

Abstract. The surface radiation budget plays a central role in summer ice melt and is governed by clouds and surface albedo. I calculated the net radiation flux for a range of albedos under sunny and cloudy skies and determined the break-even value, where the net radiation is the same for cloudy and sunny skies. Break-even albedos range from 0.30 in September to 0.58 in July. For snow covered or bare ice, sunny skies always result in less radiative heat input. In contrast, leads always have, and ponds usually have, more radiative input under sunny skies than cloudy skies. Snow covered ice has a net radiation flux that is negative or near zero under sunny skies, resulting in radiative cooling. Areally averaged albedos for sea ice in July result in a smaller net radiation flux under cloudy skies. For the other four months, the net radiation is smaller under sunny skies.

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Salinity effects on cultured Neogloboquadrina pachyderma (sinistral) from high latitudes: new paleoenvironmental insights

Geo-Marine Letters ◽

10.1007/s00367-020-00677-1 ◽

2021 ◽

Vol 41 (1) ◽

Author(s):

Jacqueline Bertlich ◽

Nikolaus Gussone ◽

Jasper Berndt ◽

Heinrich F. Arlinghaus ◽

Gerhard S. Dieckmann

Keyword(s):

Sea Ice ◽

Cold Water ◽

Weddell Sea ◽

Wall Thickening ◽

High Latitudes ◽

Neogloboquadrina Pachyderma ◽

Antarctic Sea Ice ◽

The Antarctic ◽

Water Species ◽

Cold Water Species

AbstractThis study presents culture experiments of the cold water species Neogloboquadrina pachyderma (sinistral) and provides new insights into the incorporation of elements in foraminiferal calcite of common and newly established proxies for paleoenvironmental applications (shell Mg/Ca, Sr/Ca and Na/Ca). Specimens were collected from sea ice during the austral winter in the Antarctic Weddell Sea and subsequently cultured at different salinities and a constant temperature. Incorporation of the fluorescent dye calcein showed new chamber formation in the culture at salinities of 30, 31, and 69. Cultured foraminifers at salinities of 46 to 83 only revealed chamber wall thickening, indicated by the fluorescence of the whole shell. Signs of reproduction and the associated gametogenic calcite were not observed in any of the culture experiments. Trace element analyses were performed using an electron microprobe, which revealed increased shell Mg/Ca, Sr/Ca, and Na/Ca values at higher salinities, with Mg/Ca showing the lowest sensitivity to salinity changes. This study enhances the knowledge about unusually high element concentrations in foraminifera shells from high latitudes. Neogloboquadrina pachyderma appears to be able to calcify in the Antarctic sea ice within brine channels, which have low temperatures and exceptionally high salinities due to ongoing sea ice formation.

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