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  1. Article ; Online: Spatially consistent microbial biomass and future cellular carbon release from melting Northern Hemisphere glacier surfaces

    Ian T. Stevens / Tristram D. L. Irvine-Fynn / Arwyn Edwards / Andrew C. Mitchell / Joseph M. Cook / Philip R. Porter / Tom O. Holt / Matthias Huss / Xavier Fettweis / Brian J. Moorman / Birgit Sattler / Andy J. Hodson

    Communications Earth & Environment, Vol 3, Iss 1, Pp 1-

    2022  Volume 10

    Abstract: Average microbial biomass loads in glacial melt water are similar despite different environmental settings allowing for estimation of regional carbon export from melting glacier surfaces, according to direct observations at eight northern hemisphere ... ...

    Abstract Average microbial biomass loads in glacial melt water are similar despite different environmental settings allowing for estimation of regional carbon export from melting glacier surfaces, according to direct observations at eight northern hemisphere glaciers and two Greenland Ice Sheet sites.
    Keywords Geology ; QE1-996.5 ; Environmental sciences ; GE1-350
    Language English
    Publishing date 2022-11-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Temporal Variability of Surface Reflectance Supersedes Spatial Resolution in Defining Greenland’s Bare-Ice Albedo

    Tristram D. L. Irvine-Fynn / Pete Bunting / Joseph M. Cook / Alun Hubbard / Nicholas E. Barrand / Edward Hanna / Andy J. Hardy / Andrew J. Hodson / Tom O. Holt / Matthias Huss / James B. McQuaid / Johan Nilsson / Kathrin Naegeli / Osian Roberts / Jonathan C. Ryan / Andrew J. Tedstone / Martyn Tranter / Christopher J. Williamson

    Remote Sensing, Vol 14, Iss 62, p

    2022  Volume 62

    Abstract: Ice surface albedo is a primary modulator of melt and runoff, yet our understanding of how reflectance varies over time across the Greenland Ice Sheet remains poor. This is due to a disconnect between point or transect scale albedo sampling and the ... ...

    Abstract Ice surface albedo is a primary modulator of melt and runoff, yet our understanding of how reflectance varies over time across the Greenland Ice Sheet remains poor. This is due to a disconnect between point or transect scale albedo sampling and the coarser spatial, spectral and/or temporal resolutions of available satellite products. Here, we present time-series of bare-ice surface reflectance data that span a range of length scales, from the 500 m for Moderate Resolution Imaging Spectrometer’s MOD10A1 product, to 10 m for Sentinel-2 imagery, 0.1 m spot measurements from ground-based field spectrometry, and 2.5 cm from uncrewed aerial drone imagery. Our results reveal broad similarities in seasonal patterns in bare-ice reflectance, but further analysis identifies short-term dynamics in reflectance distribution that are unique to each dataset. Using these distributions, we demonstrate that areal mean reflectance is the primary control on local ablation rates, and that the spatial distribution of specific ice types and impurities is secondary. Given the rapid changes in mean reflectance observed in the datasets presented, we propose that albedo parameterizations can be improved by (i) quantitative assessment of the representativeness of time-averaged reflectance data products, and, (ii) using temporally-resolved functions to describe the variability in impurity distribution at daily time-scales. We conclude that the regional melt model performance may not be optimally improved by increased spatial resolution and the incorporation of sub-pixel heterogeneity, but instead, should focus on the temporal dynamics of bare-ice albedo.
    Keywords Greenland ice sheet ; reflectance ; albedo ; MODIS ; Sentinel-2 ; uncrewed aerial vehicle ; Science ; Q
    Subject code 333
    Language English
    Publishing date 2022-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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