Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Biogeochemical evolution of cryoconite holes on Canada Glacier, Taylor Valley, Antarctica

Bagshaw, Elizabeth, Tranter, Martyn, Fountain, Andrew G., Welch, Kathleen A., Basagic, Hassan and Lyons, W. Berry 2007. Biogeochemical evolution of cryoconite holes on Canada Glacier, Taylor Valley, Antarctica. Journal of Geophysical Research: Biogeosciences 112 (G4) , G04S35. 10.1029/2007JG000442

[img]
Preview
PDF - Published Version
Download (392kB) | Preview

Abstract

The cryoconite holes of the McMurdo Dry Valleys are simple, closed biogeochemical systems involving water, ice, mineral and organic debris, which serve as ecosystems for consortia of microorganisms. This study is the first to document the seasonal and annual chemical evolution of solutes in cryoconite holes. Samples of glacier ice, frozen cryoconite holes and those containing water were collected during the austral summer of 2005–2006. The isolation age was calculated from the excess Cl− in the holes, and varied from 0 to 5 years (a), consistent with the last hot summer when the cryoconite holes were open to the atmosphere. The holes progressively deepen with isolation age. Variations in DIC, DOC, K+ and SO42− suggest that dissolution of primary minerals in the cryoconite debris, cyclical precipitation and dissolution of secondary carbonates, net photosynthesis over summer and net respiration during the autumnal freeze are the principal reactions which perturb the seasonal and annual solute concentrations in the holes. DOC is generated in the holes at a rate of 7.5 μg C cm−2 a−1, and non-sea-salt K+ accumulates in frozen holes at a rate of 0.073 μeq cm−2 a−1. We infer that C cycling is complex even in these otherwise simple systems.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Additional Information: Pdf uploaded in accordance with the publisher’s policy at http://www.sherpa.ac.uk/romeo/issn/2169-8953/(accessed 19/12/2014)
Publisher: American Geophysical Union
ISSN: 2169-8953
Date of First Compliant Deposit: 30 March 2016
Last Modified: 04 Jun 2017 06:38
URI: http://orca-mwe.cf.ac.uk/id/eprint/63009

Citation Data

Cited 35 times in Google Scholar. View in Google Scholar

Cited 49 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics