2020
DOI: 10.5194/tc-2020-170
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Spectral Characterization, Radiative Forcing, and Pigment Content of Coastal Antarctic Snow Algae: Approaches to Spectrally Discriminate Red and Green Communities and Their Impact on Snowmelt

Abstract: Abstract. Here, we present radiative forcing (RF) estimates by snow algae in the Antarctic Peninsula (AP) region from multi-year measurements of solar radiation and ground-based hyperspectral characterization of red and green snow algae collected during a brief field expedition in austral summer 2018. Our analysis includes pigment content from samples at three bloom sites. Algal biomass in the snow and albedo reduction are well-correlated across the visible spectrum. Relative to clean snow, visibly green-patch… Show more

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Cited by 9 publications
(16 citation statements)
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“…Our work builds upon previous use of Sentinel 2 imagery to study snow algae in Antarctica (Huovinen et al, 2018;Gray et al, 2020;Khan et al, 2020Khan et al, , 2021 and shows the advantage gained by using high spatial and spectral resolution satellites, such as WorldView 2 or 3. Figure 12 compares snow algae identified through the methodology presented here, with that used in Gray et al (2020), which used coarser-resolution Sentinel 2 satellite imagery.…”
Section: Worldview Satellites To Map Snow Algaementioning
confidence: 82%
See 1 more Smart Citation
“…Our work builds upon previous use of Sentinel 2 imagery to study snow algae in Antarctica (Huovinen et al, 2018;Gray et al, 2020;Khan et al, 2020Khan et al, , 2021 and shows the advantage gained by using high spatial and spectral resolution satellites, such as WorldView 2 or 3. Figure 12 compares snow algae identified through the methodology presented here, with that used in Gray et al (2020), which used coarser-resolution Sentinel 2 satellite imagery.…”
Section: Worldview Satellites To Map Snow Algaementioning
confidence: 82%
“…Moreover, this analysis focused only on a snapshot of growth from 1 year's worth of imagery at each bloom location. The problem of red bloom detection in Sentinel 2 imagery has been somewhat addressed by the work of Khan et al (2020), yet large uncertainties remain when deriving area and biomass estimates from 10 m spatial resolution pixels. Key to using remotely sensed observations to study Antarctic terrestrial ecology lies in this balance between spatial resolution and area coverage.…”
Section: Introductionmentioning
confidence: 99%
“…Snow-covered surfaces in the interior of the Antarctic continent can enhance the downwelling UV irradiance by up to 50% due to the extremely high albedo (about 95% in the UV part of the spectrum) 36 . Although the albedo is considerably lower at coastal sites on King George Island, where the snow is often thin and patchy in late spring 37 , it may have contributed to enhance the surface UV over the period Nov. 24th–Dec. 4th.…”
Section: Resultsmentioning
confidence: 99%
“…Thus, natural selection appears to favor albedo-reducing pigmentation that strikes a balance between melt-inducing coloration and all-absorbing black that would overheat cells and disrupt their function (Dial et al, 2018). Because snow and ice algae generate liquid from frozen water, a positive feedback loop between them and the ice features they inhabit may be critical to cryosphere decline (Anesio et al, 2017;Ganey et al, 2017;Hotaling et al, 2017b;Khan et al, 2020;Stibal et al, 2012;Takeuchi, 2009). However, snow and ice algae contribution to BAR is highly variable.…”
Section: Snow and Ice Algaementioning
confidence: 99%