[en] Albedo reduction due to light-absorbing impurities can substantially enhance ice sheet surface melt by increasing surface absorption of solar energy. Glacier algae have been suggested to play a critical role in darkening the ablation zone in southwestern Greenland. It was very recently found that the Sentinel-3 Ocean and Land Colour Instrument (OLCI) band ratio R709 nm∕R673 nm can characterize the spatial patterns of glacier algal blooms. However, Sentinel-3 was launched in 2016, and current data are only available over three melting seasons (2016–2019). Here, we demonstrate the capability of the MEdium Resolution Imaging Spectrometer (MERIS) for mapping glacier algae from space and extend the quantification of glacier algal blooms over southwestern Greenland back to the period 2004–2011. Several band ratio indices (MERIS chlorophyll a indices and the impurity index) were computed and compared with each other. The results indicate that the MERIS two-band ratio index (2BDA) R709 nm∕R665 nm is very effective in capturing the spatial distribution and temporal dynamics of glacier algal growth on bare ice in July and August. We analyzed the interannual (2004–2011) and summer (July–August) trends of algal distribution and found significant seasonal and interannual increases in glacier algae close to the Jakobshavn Isbrae Glacier and along the middle dark zone between the altitudes of 1200 and 1400 m. Using broadband albedo data from the Moderate Resolution Imaging Spectroradiometer (MODIS), we quantified the impact of glacier algal growth on bare ice albedo, finding a significant correlation between algal development and albedo reduction over algae-abundant areas. Our analysis indicates the strong potential for the satellite algal index to be used to reduce bare ice albedo biases in regional climate model simulations.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Wang, S.
Tedesco, M.
Alexander, P.
Xu, M.
Fettweis, Xavier ; Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Language :
English
Title :
Quantifying spatiotemporal variability of glacier algal blooms and the impact on surface albedo in southwestern Greenland
Publication date :
28 August 2020
Journal title :
The Cryosphere
ISSN :
1994-0416
eISSN :
1994-0424
Publisher :
Copernicus, Katlenberg-Lindau, Germany
Volume :
14
Pages :
2687–2713
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif
Alexander, P. M., Tedesco, M., Fettweis, X., van de Wal, R. S. W., Smeets, C. J. P. P., and van den Broeke, M. R.: Assessing spatiotemporal variability and trends in modelled and measured Greenland Ice Sheet albedo (2000-2013), The Cryosphere, 8, 2293-2312, https://doi.org/10.5194/tc-8-2293-2014, 2014
Anderson, G. P., Felde, G. W., Hoke, M. L., Ratkowski, A. J., Cooley, T. W., Chetwynd, J. H., Gardner, J. A., Adler-Golden, S. M., Matthew, M. W., Berk, A., Bernstein, L. S., Acharya, P. K., Miller, D. P., and Lewis, P. E.: MODTRAN4-based atmospheric correction algorithm: FLAASH (fast line-of-sight atmospheric analysis of spectral hypercubes), in: Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery VIII, vol. 4725, International Society for Optics and Photonics, 65-72, 2002
Anesio, A. M., Lutz, S., Chrismas, N. A. M., and Benning, L. G.: The microbiome of glaciers and ice sheets, NPJ Biofilms Microbiomes, 3, 10, 2017
Beck, R., Zhan, S., Liu, H., Tong, S., Yang, B., Xu, M., Ye, Z., Huang, Y., Shu, S., Wu, Q., Wang, S., Berling, K., Murray, A., Emery, E., Reif, M., Harwood, J., Young, J., Nietch, C., Macke, D., Martin, M., Stillings, G., Stump, R., and Su, H.: Comparison of satellite reflectance algorithms for estimating chlorophyll a in a temperate reservoir using coincident hyperspectral aircraft imagery and dense coincident surface observations, Remote Sens. Environ., 178(Supplement C), 15-30, 2016
Binding, C. E., Greenberg, T. A., and Bukata, R. P.: The MERIS Maximum Chlorophyll Index; its merits and limitations for inland water algal bloom monitoring, J. Great Lakes Res., 39, 100-107, 2013
Blondeau-Patissier, D., Gower, J. F. R., Dekker, A. G., Phinn, S. R., and Brando, V. E.: A review of ocean color remote sensing methods and statistical techniques for the detection, mapping and analysis of phytoplankton blooms in coastal and open oceans, Prog. Oceanogr., 123, 123-144, 2014
Box, J. E., Fettweis, X., Stroeve, J. C., Tedesco, M., Hall, D. K., and Steffen, K.: Greenland ice sheet albedo feedback: thermodynamics and atmospheric drivers, The Cryosphere, 6, 821-839, https://doi.org/10.5194/tc-6-821-2012, 2012
Casey, K. A., Polashenski, C. M., Chen, J., and Tedesco, M.: Impact of MODIS sensor calibration updates on Greenland Ice Sheet surface reflectance and albedo trends, The Cryosphere, 11, 1781-1795, https://doi.org/10.5194/tc-11-1781-2017, 2017
Cavicchioli, R., Ripple, W. J., Timmis, K. N., Azam, F., Bakken, L. R., Baylis, M., Behrenfeld, M. J., Boetius, A., Boyd, P. W., Classen, A. T., Crowther, T. W., Danovaro, R., Foreman, C. M., Huisman, J., Hutchins, D. A., Jansson, J. K., Karl, D. M., Koskella, B., Mark Welch, D. B., Martiny, J. B. H., Moran, M. A., Orphan, V. J., Reay, D. S., Remais, J. V., Rich, V. I., Singh, B. K., Stein, L. Y., Stewart, F. J., Sullivan, M. B., van Oppen, M. J. H., Weaver, S. C., Webb, E. A., and Webster, N. S.: Scientists' warning to humanity: microorganisms and climate change, Nat. Rev. Microbiol., 17, 569-586, https://doi.org/10.1038/s41579-019-0222-5, 2019
Chandler, D. M., Alcock, J. D., Wadham, J. L., Mackie, S. L., and Telling, J.: Seasonal changes of ice surface characteristics and productivity in the ablation zone of the Greenland Ice Sheet, The Cryosphere, 9, 487-504, https://doi.org/10.5194/tc-9-487-2015, 2015
Condom, T., Dumont, M., Mourre, L., Sicart, J. E., Rabatel, A., Viani, A., and Soruco, A.: Technical note: A low-cost albedometer for snow and ice measurements-theoretical results and application on a tropical mountain in Bolivia, Geosci. Instrum. Method. Data Syst., 7, 169-178, https://doi.org/10.5194/gi-7-169-2018, 2018
Cook, J. M., Tedstone, A. J.,Williamson, C., McCutcheon, J., Hodson, A. J., Dayal, A., Skiles, M., Hofer, S., Bryant, R., McAree, O., McGonigle, A., Ryan, J., Anesio, A. M., Irvine-Fynn, T. D. L., Hubbard, A., Hanna, E., Flanner, M., Mayanna, S., Benning, L. G., van As, D., Yallop, M., McQuaid, J. B., Gribbin, T., and Tranter, M.: Glacier algae accelerate melt rates on the south-western Greenland Ice Sheet, The Cryosphere, 14, 309-330, https://doi.org/10.5194/tc-14-309-2020, 2020
Dee, D. P., Uppala, S. M., Simmons, A. J., Berrisford, P., Poli, P., Kobayashi, S., Andrae, U., Balmaseda, M. A., Balsamo, G., Bauer, P., Bechtold, P., Beljaars, A. C. M., van de Berg, L., Bidlot, J., Bormann, N., Delsol, C., Dragani, R., Fuentes, M., Geer, A. J., Haimberger, L., Healy, S. B., Hersbach, H., Hólm, E. V., Isaksen, L., Kallberg, P., Kohler, M., Matricardi, M., McNally, A. P., Monge-Sanz, B. M., Morcrette, J.-J., Park, B.-K., Peubey, C., de Rosnay, P., Tavolato, C., Thépaut, J.-N., and Vitart, F.: The ERA-Interim reanalysis: configuration and performance of the data assimilation system, Q. J. Roy. Meteorol. Soc., 137, 553-597, https://doi.org/10.1002/qj.828, 2011
De Ridder, K. and Gallée, H.: Land Surface-Induced Regional Climate Change in Southern Israel, J. Appl. Meteorol., 37, 1470-1485, 1998
Dumont, M., Brun, E., Picard, G., Michou, M., Libois, Q., Petit, J.-R., Geyer, M., Morin, S., and Josse, B.: Contribution of light-absorbing impurities in snow to Greenland's darkening since 2009, Nat. Geosci., 7, 509-512, https://doi.org/10.1038/ngeo2180, 2014
European Space Agency (ESA): MERIS Algorithm Theoretical Basis Document 2-17-Pixel Classification, Issue 5.0, 30 May 2011
European Space Agency (ESA): MERIS Product Handbook, Issue 3.0, 1 August 2011
Fettweis, X., Tedesco, M., van den Broeke, M., and Ettema, J.: Melting trends over the Greenland ice sheet (1958-2009) from spaceborne microwave data and regional climate models, The Cryosphere, 5, 359-375, https://doi.org/10.5194/tc-5-359-2011, 2011
Fettweis, X., Box, J. E., Agosta, C., Amory, C., Kittel, C., Lang, C., van As, D., Machguth, H., and Gallée, H.: Reconstructions of the 1900-2015 Greenland ice sheet surface mass balance using the regional climate MAR model, The Cryosphere, 11, 1015-1033, https://doi.org/10.5194/tc-11-1015-2017, 2017
Flanner, M. G., Zender, C. S., Randerson, J. T., and Rasch, P. J.: Present-day climate forcing and response from black carbon in snow, J. Geophys. Res., 112, 3131, https://doi.org/10.1029/2006JD008003, 2007
Flanner, M. G., Zender, C. S., Hess, P. G., Mahowald, N. M., Painter, T. H., Ramanathan, V., and Rasch, P. J.: Springtime warming and reduced snow cover from carbonaceous particles, Atmos. Chem. Phys., 9, 2481-2497, https://doi.org/10.5194/acp-9-2481-2009, 2009
Gallée, H. and Schayes, G.: Development of a Three-Dimensional Meso-Primitive Equation Model: Katabatic Winds Simulation in the Area of Terra Nova Bay, Antarctica, Mon. Weather Rev., 122, 671-685, 1994
Ganey, G. Q., Loso, M. G., Burgess, A. B., and Dial, R. J.: The role of microbes in snowmelt and radiative forcing on an Alaskan icefield, Nat. Geosci., 10, 754-759, https://doi.org/10.1038/ngeo3027, 2017
Gholizadeh, M. H., Melesse, A. M., and Reddi, L.: A Comprehensive Review on Water Quality Parameters Estimation Using Remote Sensing Techniques, Sensors, 16, 8, https://doi.org/10.3390/s16081298, 2016
Gitelson, A.: The peak near 700 nm on radiance spectra of algae and water: relationships of its magnitude and position with chlorophyll concentration, Int. J. Remote Sens., 13, 3367-3373, 1992
Goelles, T. and Bøggild, C. E.: Albedo reduction of ice caused by dust and black carbon accumulation: a model applied to the Ktransect, West Greenland, J. Glaciol., 63, 1063-1076, 2017
Gower, J., King, S., and Goncalves, P.: Global monitoring of plankton blooms using MERIS MCI, Int. J. Remote Sens., 29, 6209-6216, 2008
Hall, D. K. and Martinec, J.: Remote sensing of snow and ice, in: Principles and Applications of Imaging Radar, edited by: Henderson, F. M. and Lewis, A. J., 677-703, 1985
Hall, D. K. and Riggs, G. A.: MODIS/Terra Snow Cover Daily L3 Global 500m SIN Grid, Version 6, Boulder, Colorado USA, NASA National Snow and Ice Data Center Distributed Active Archive Center, https://doi.org/10.5067/MODIS/MOD10A1.006, 2016
Hanna, E., Cropper, T. E., Hall, R. J., and Cappelen, J.: Greenland Blocking Index 1851-2015: a regional climate change signal, Int. J. Climatol., 36, 4847-4861, 2016
Hofer, S., Tedstone, A. J., Fettweis, X., and Bamber, J. L.: Decreasing cloud cover drives the recent mass loss on the Greenland Ice Sheet, Sci. Adv., 3, e1700584, https://doi.org/10.1126/sciadv.1700584, 2017
Howat, I. M., Negrete, A., and Smith, B. E.: The Greenland Ice Mapping Project (GIMP) land classification and surface elevation data sets, The Cryosphere, 8, 1509-1518, https://doi.org/10.5194/tc-8-1509-2014, 2014
Howat, I. M., Negrete, A., and Smith, B.: MEaSURES Greenland Ice Mapping Project (GIMP) Digital Elevation Model, Version 1., USA NASA Natl. Snow Ice Data Cent, Distrib. Act. Arch. Cent., Boulder, Colorado, https://doi.org/10.5067/NV34YUIXLP9W, 2015
Huovinen, P., Ramírez, J., and Gómez, I.: Remote sensing of albedo-reducing snow algae and impurities in the Maritime Antarctica, ISPRS J. Photogramm., 146, 507-517, 2018
Legleiter, C. J., Tedesco, M., Smith, L. C., Behar, A. E., and Overstreet, B. T.: Mapping the bathymetry of supraglacial lakes and streams on the Greenland ice sheet using field measurements and high-resolution satellite images, The Cryosphere, 8, 215-228, https://doi.org/10.5194/tc-8-215-2014, 2014
Lutz, S., Anesio, A. M., Jorge Villar, S. E., and Benning, L. G.: Variations of algal communities cause darkening of a Greenland glacier, FEMS Microbiol. Ecol., 89, 402-414, 2014
Lutz, S., Anesio, A. M., Raiswell, R., Edwards, A., Newton, R. J., Gill, F., and Benning, L. G.: The biogeography of red snow microbiomes and their role in melting arctic glaciers, Nat. Commun., 7, 11968, https://doi.org/10.1038/ncomms11968, 2016
Lutz, S., Anesio, A. M., Edwards, A., and Benning, L. G.: Linking microbial diversity and functionality of arctic glacial surface habitats, Environ. Microbiol., 19, 551-565, 2017
Lutz, S., McCutcheon, J., McQuaid, J. B., and Benning, L. G.: The diversity of ice algal communities on the Greenland Ice Sheet as revealed by oligotyping, Microb. Genom., 4, https://doi.org/10.1099/mgen.0.000159, 2018
Lyapustin, A., Wang, Y., Xiong, X., Meister, G., Platnick, S., Levy, R., Franz, B., Korkin, S., Hilker, T., Tucker, J., Hall, F., Sellers, P., Wu, A., and Angal, A.: Scientific impact of MODIS C5 calibration degradation and C6+ improvements, Atmos. Meas. Tech., 7, 4353-4365, https://doi.org/10.5194/amt-7-4353-2014, 2014
Matthews, M. W.: A current review of empirical procedures of remote sensing in inland and near-coastal transitional waters, Int. J. Remote Sens., 32, 6855-6899, 2011
Mioduszewski, J. R., Rennermalm, A. K., Hammann, A., Tedesco, M., Noble, E. U., Stroeve, J. C., and Mote, T. L.: Atmospheric drivers of Greenland surface melt revealed by selforganizing maps, J. Geophys. Res.-Atmos., 121, 5095-5114, https://doi.org/10.1002/2015JD024550, 2016
Mishra, S. and Mishra, D. R.: Normalized difference chlorophyll index: A novel model for remote estimation of chlorophyll a concentration in turbid productive waters, Remote Sens. Environ., 117, 394-406, 2012
Moses, W. J., Gitelson, A. A., Berdnikov, S., and Povazhnyy, V.: Satellite Estimation of Chlorophyll a Concentration Using the Red and NIR Bands of MERIS-The Azov Sea Case Study, IEEE Geosci Remote S., 6, 845-849, https://doi.org/10.1109/lgrs.2009.2026657, 2009
Moses, W. J., Gitelson, A. A., Berdnikov, S., Saprygin, V., and Povazhnyi, V.: Operational MERIS-based NIR-red algorithms for estimating chlorophyll a concentrations in coastal waters-The Azov Sea case study, Remote Sens. Environ., 121, 118-124, 2012
Moustafa, S. E., Rennermalm, A. K., Smith, L. C., Miller, M. A., Mioduszewski, J. R., Koenig, L. S., Hom, M. G., and Shuman, C. A.: Multi-modal albedo distributions in the ablation area of the southwestern Greenland Ice Sheet, The Cryosphere, 9, 905-923, https://doi.org/10.5194/tc-9-905-2015, 2015
Nordenskiold, A. E.: I.-Account of an Expedition to Greenland in the year 1870, Geol. Mag., 9, 289-306, 1872
Painter, T. H., Duval, B., Thomas, W. H., Mendez, M., Heintzelman, S., and Dozier, J.: Detection and quantification of snow algae with an airborne imaging spectrometer, Appl. Environ. Microbiol., 67, 5267-5272, 2001
Palmer, S. C. J., Hunter, P. D., Lankester, T., Hubbard, S., Spyrakos, E., N. Tyler, A., Présing, M., Horváth, H., Lamb, A., Balzter, H., and Tóth, V. R.: Validation of Envisat MERIS algorithms for chlorophyll retrieval in a large, turbid and optically-complex shallow lake, Remote Sens. Environ., 157, 158-169, 2015
Remias, D., Schwaiger, S., Aigner, S., Leya, T., Stuppner, H., and Lütz, C.: Characterization of an UV-and VIS-absorbing, purpurogallin-derived secondary pigment new to algae and highly abundant in Mesotaenium berggrenii (Zygnematophyceae, Chlorophyta), an extremophyte living on glaciers, FEMS Microbiol. Ecol., 79, 638-648, 2012
Reshitnyk, L., Costa, M., Robinson, C., and Dearden, P.: Evaluation of WorldView-2 and acoustic remote sensing for mapping benthic habitats in temperate coastal Pacific waters, Remote Sens. Environ., 153, 7-23, 2014
Ryan, J. C., Hubbard, A., Stibal, M., Irvine-Fynn, T. D., Cook, J., Smith, L. C., Cameron, K., and Box, J.: Dark zone of the Greenland Ice Sheet controlled by distributed biologically-active impurities, Nat. Commun., 9, 1065, https://doi.org/10.1038/s41467-018-03353-2, 2018
Shimada, R., Takeuchi, N., and Aoki, T.: Inter-Annual and Geographical Variations in the Extent of Bare Ice and Dark Ice on the Greenland Ice Sheet Derived from MODIS Satellite Images, Front. Earth Sci., 4, 2293, https://doi.org/10.3389/feart.2016.00043, 2016
Skiles, S. M., Flanner, M., Cook, J. M., Dumont, M., and Painter, T. H.: Radiative forcing by light-absorbing particles in snow, Nat. Clim. Change, 8, 964-971, 2018
Stibal, M., Gozdereliler, E., Cameron, K. A., Box, J. E., Stevens, I. T., Gokul, J. K., Schostag, M., Zarsky, J. D., Edwards, A., Irvine-Fynn, T. D. L., and Jacobsen, C. S.: Microbial abundance in surface ice on the Greenland Ice Sheet, Front. Microbiol., 6, 225, https://doi.org/10.3389/fmicb.2015.00225, 2015
Stibal, M., Box, J. E., Cameron, K. A., Langen, P. L., Yallop, M. L., Mottram, R. H., Khan, A. L., Molotch, N. P., Chrismas, N. A. M., Cali Quaglia, F., Remias, D., Smeets, C. J. P. P., van den Broeke, M. R., Ryan, J. C., Hubbard, A., Tranter, M., van As, D., and Ahlstrøm, A. P.: Algae Drive Enhanced Darkening of Bare Ice on the Greenland Ice Sheet, Geophys. Res. Lett., 44, 11-463, https://doi.org/10.1002/2017GL075958, 2017
Stroeve, J., Box, J. E., Wang, Z., Schaaf, C., and Barrett, A.: Reevaluation of MODIS MCD43 Greenland albedo accuracy and trends, Remote Sens. Environ., 138, 199-214, 2013
Takeuchi, N.: The altitudinal distribution of snow algae on an Alaska glacier (Gulkana Glacier in the Alaska Range), Hydrol. Process., 15, 3447-3459, 2001
Takeuchi, N., Dial, R., Kohshima, S., Segawa, T., and Uetake, J.: Spatial distribution and abundance of red snow algae on the Harding Icefield, Alaska derived from a satellite image, Geophys. Res. Lett., 33, 570, https://doi.org/10.1029/2006GL027819, 2006
Tedesco, M., Fettweis, X., van den Broeke, M. R., van de Wal, R. S. W., C J P, van de Berg, W. J., Serreze, M. C., and Box, J. E.: The role of albedo and accumulation in the 2010 melting record in Greenland, Environ. Res. Lett., 6, 014005, https://doi.org/10.1088/1748-9326/6/1/014005, 2011
Tedesco, M., Foreman, C. M., Anton, J., Steiner, N., and Schwartzman, T.: Comparative analysis of morphological, mineralogical and spectral properties of cryoconite in Jakobshavn Isbrae, Greenland, and Canada Glacier, Antarctica, Ann. Glaciol., 54, 147-157, 2013
Tedesco, M., Doherty, S., Fettweis, X., Alexander, P., Jeyaratnam, J., and Stroeve, J.: The darkening of the Greenland ice sheet: trends, drivers, and projections (1981-2100), The Cryosphere, 10, 477-496, https://doi.org/10.5194/tc-10-477-2016, 2016
Tedesco, M., Box, J. E., Cappelen, J., Fausto, R. S., Fettweis, X., Andersen, J. K., Mote, T., Smeets, C. J. P. P., van As, D., and van de Wal, R. S. W.: Greenland Ice Sheet [in Arctic Report Card 2018], available at: https://arctic.noaa.gov/Report-Card/Report-Card-2018/ArtMID/ 7878/ArticleID/781/Greenland-Ice-Sheet (last access: 1 October 2019), 2018
Tedstone, A. J., Bamber, J. L., Cook, J. M., Williamson, C. J., Fettweis, X., Hodson, A. J., and Tranter, M.: Dark ice dynamics of the south-west Greenland Ice Sheet, The Cryosphere, 11, 2491-2506, https://doi.org/10.5194/tc-11-2491-2017, 2017
Tedstone, A. J., Cook, J. M., Williamson, C. J., Hofer, S., Mc-Cutcheon, J., Irvine-Fynn, T., Gribbin, T., and Tranter, M.: Algal growth and weathering crust state drive variability in western Greenland Ice Sheet ice albedo, The Cryosphere, 14, 521-538, https://doi.org/10.5194/tc-14-521-2020, 2020
Toller, G., Xiong, X. J., Sun, J., Wenny, B. N., Geng, X., Kuyper, J., Angal, A., Chen, H., Madhavan, S., and Wu, A.: Terra and Aqua moderate-resolution imaging spectroradiometer collection 6 level 1B algorithm, J. Appl. Remote Sens., 7, 073557, https://doi.org/10.1117/1.JRS.7.073557, 2013
Uetake, J., Naganuma, T., Hebsgaard, M. B., Kanda, H., and Kohshima, S.: Communities of algae and cyanobacteria on glaciers in west Greenland, Polar Sci., 4, 71-80, 2010
Vermote, E. and Wolfe, R.: MOD09GA MODIS/Terra Surface Reflectance Daily L2G Global 1kmand 500m SIN Grid V006. 2015, distributed by NASA EOSDIS Land Processes DAAC, https://doi.org/10.5067/MODIS/MOD09GA.006, 2020
Wang, S., Liu, H., Yu, B., Zhou, G., and Cheng, X.: Revealing the early ice flow patterns with historical Declassified Intelligence Satellite Photographs back to 1960s, Geophys. Res. Lett., 43, 5758-5767, https://doi.org/10.1002/2016GL068990, 2016
Wang, S., Tedesco, M., Xu, M., and Alexander, P. M.: Mapping Ice Algal Blooms in Southwest Greenland From Space, Geophys. Res. Lett., 45, 11,779-11,788, 2018
Warren, S. G.: Optical properties of snow, Rev. Geophys., 20, 67-89, https://doi.org/10.1029/RG020i001p00067, 1982
Wientjes, I. G. M. and Oerlemans, J.: An explanation for the dark region in the western melt zone of the Greenland ice sheet, The Cryosphere, 4, 261-268, https://doi.org/10.5194/tc-4-261-2010, 2010
Wientjes, I. G. M., Van de Wal, R. S. W., Reichart, G. J., Sluijs, A., and Oerlemans, J.: Dust from the dark region in the western ablation zone of the Greenland ice sheet, The Cryosphere, 5, 589-601, https://doi.org/10.5194/tc-5-589-2011, 2011
Wientjes, I. G. M., Van De Wal, R. S. W., Schwikowski, M., Zapf, A., Fahrni, S., andWacker, L.: Carbonaceous particles reveal that Late Holocene dust causes the dark region in the western ablation zone of the Greenland ice sheet, J. Glaciol., 58, 787-794, 2012
Williamson, C. J., Anesio, A. M., Cook, J., Tedstone, A., Poniecka, E., Holland, A., Fagan, D., Tranter, M., and Yallop, M. L.: Ice algal bloom development on the surface of the Greenland Ice Sheet, FEMS Microbiol. Ecol., 94, fiy025, https://doi.org/10.1093/femsec/fiy025, 2018
Williamson, C. J., Cameron, K. A., Cook, J. M., Zarsky, J. D., Stibal, M., and Edwards, A.: Glacier Algae: A Dark Past and a Darker Future, Front. Microbiol. 10, p. 524, https://doi.org/10.3389/fmicb.2019.00524, 2019
Williamson, C. J., Cook, J., Tedstone, A., Yallop, M., Mc-Cutcheon, J., Poniecka, E., Campbell, D., Irvine-Fynn, T., McQuaid, J., Tranter, M., Perkins, R., and Anesio, A.: Algal photophysiology drives darkening and melt of the Greenland Ice Sheet, P. Natl. Acad. Sci. USA, 117, 5694-5705, https://doi.org/10.1073/pnas.1918412117, 2020
Xu, M., Liu, H., Beck, R., Lekki, J., Yang, B., Shu, S., Kang, E. L., Anderson, R., Johansen, R., Emery, E., Reif, M., and Benko, T.: A spectral space partition guided ensemble method for retrieving chlorophyll a concentration in inland waters from Sentinel-2A satellite imagery, J. Great Lakes Res., 45, 454-465, https://doi.org/10.1016/j.jglr.2018.09.002, 2019
Xu, M., Liu, H., Beck, R., Lekki, J., Yang, B., Shu, S., Liu, Y., Benko, T., Anderson, R., Tokars, R., Johansen, R., Emery, E., and Reif, M.: Regionally and Locally Adaptive Models for Retrieving Chlorophyll a Concentration in Inland Waters From Remotely Sensed Multispectral and Hyperspectral Imagery, IEEE T. Geosci. Remote, 57, 4758-4774, https://doi.org/10.1109/tgrs.2019.2892899, 2019
Yallop, M. L., Anesio, A. M., Perkins, R. G., Cook, J., Telling, J., Fagan, D., MacFarlane, J., Stibal, M., Barker, G., Bellas, C., Hodson, A., Tranter, M.,Wadham, J., and Roberts, N.W.: Photophysiology and albedo-changing potential of the ice algal community on the surface of the Greenland ice sheet, ISME J., 6, 2302-2313, 2012
Yang, K. and Smith, L. C.: Supraglacial streams on the Greenland Ice Sheet delineated from combined spectral-shape information in high-resolution satellite imagery, IEEE Geosci Remote S., 10, 801-805, 2013
Zuo, Z. and Oerlemans, J.: Modelling albedo and specific balance of the Greenland ice sheet: calculations for the Søndre Strømfjord transect, J. Glaciol., 42, 305-317, 1996