The cryoconite ecosystem on the greenland ice sheet

The Greenland Ice Sheet (GrIS) is the largest ice body in the northern hemisphere and hosts Earth's largest seasonally melting glacier surface ice ecosystem (>200,000 km 2 and expanding; Hodson et al., 2010a; Fettweis et al., 2011). Microbial abundance, diversity, and activity in snow and cryoconite in some portions on the GrIS have been found ...

The cryoconite ecosystem upon the Greenland Ice Sheet, (2008). The earliest stages of ecosystem succession in high-elevation (5000 metres above sea level), recently deglaciated soils, the first investigation that puts focus on the Greenland ice sheet surface as a contaminated habitat. Materials and methods Sampling Sampling has been described previously [14, 15]. In short, 34 cryoconite samples were collected from the GrIS in five different locations between May and September 2013. Sampling sites included Tasiilaq

Łokas et al. suggested a negative impact of radionuclides and heavy metals from cryoconite on downstream ecosystems. The Greenland ice sheet (GrIS) is a dynamic and unique supraglacial ecosystem. This paper presents an assessment of biological activity associated with ice surface debris (cryoconite) at the ice-sheet scale. Estimates of the mass distribution of cryoconite over the Greenland ice sheet (GIS) and the biological activity associated with it are presented and then coupled with a surface mass-balance model to estimate total carbon fluxes due to respiration and photosynthesis. Mar 23, 2016 · In summer, cryoconite holes pockmark the surface of the biologically productive region of the Greenland ice sheet, an area ten times the size of Wales (200,000 square kilometres), which is ... We examined the bacterial abundance and community composition of cryoconite over a melt season at two contrasting sites at the margin and in the interior of the Greenland ice sheet, using sequence analysis and quantitative polymerase chain reaction of coextracted 16S rDNA and rRNA. Microorganisms play a significant role in changing the physical properties of the surface of the Greenland Ice Sheet. Cryoconite holes are a hotspot for this microbial activity, yet little is known about the REDOX conditions that develop within them. In this study, we used oxygen microelectrodes and ...

Cryoconite holes form as aeolian debris melts into ice surfaces, and may cover a significant proportion of the ablation zone of glaciers (3.2–16%) in the Southern and Northern Hemispheres. 1–3 ... Aug 30, 2012 · Cryoconite holes, Greenland ... Geologists Find Massive Impact Crater in Greenland Under a Mile of Ice ... Rivers of meltwater on Greenland’s ice sheet contribute to rising ... the first investigation that puts focus on the Greenland ice sheet surface as a contaminated habitat. Materials and methods Sampling Sampling has been described previously [14, 15]. In short, 34 cryoconite samples were collected from the GrIS in five different locations between May and September 2013. Sampling sites included Tasiilaq Jul 11, 2017 · Greenland's ice sheet is full of toxins waiting to break free—and microbes that eat them ... the researchers took samples of cryoconite, a powdery windblown dust made up of microbes, soot, and ... The cryoconites themselves start when a bit of wind-blown dust containing these hardy organisms lands on the ice. The dark color of the dust absorbs more of the sun’s energy than white ice and melts a hole in the ice sheet. The holes can reach a depth of 20 cm and we saw hundreds of these little aquaria everywhere we walked on the ice.