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Titolo:
Structure, formation, and darkening process of albedo-reducing material (cryoconite) on a Himalayan glacier: A granular algal mat growing on the glacier
Autore:
Takeuchi, N; Kohshima, S; Seko, K;
Indirizzi:
Univ Alaska Fairbanks, Int Arctic Res Ctr, Frontier Observat Res Syst Global Change, Fairbanks, AK 99775 USA Univ Alaska Fairbanks Fairbanks AK USA 99775 nge, Fairbanks, AK 99775 USA Tokyo Inst Technol, Fac Sci, Fac Biosci & Biotechnol, Biol Lab,Meguro Ku, Tokyo 1528551, Japan Tokyo Inst Technol Tokyo Japan 1528551 b,Meguro Ku, Tokyo 1528551, Japan Nagoya Univ, Inst Hydrospher Atmospher Sci, Nagoya, Aichi 4648601, Japan Nagoya Univ Nagoya Aichi Japan 4648601 Sci, Nagoya, Aichi 4648601, Japan
Titolo Testata:
ARCTIC ANTARCTIC AND ALPINE RESEARCH
fascicolo: 2, volume: 33, anno: 2001,
pagine: 115 - 122
SICI:
1523-0430(200105)33:2<115:SFADPO>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
SNOW ALGAE; ANTARCTICA; ICE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Takeuchi, N Univ Alaska Fairbanks, Int Arctic Res Ctr, Frontier Observat Res Syst Global Change, 930 Koyukuk Dr,POB 757335, Fairbanks, AK 99775 USA Univ Alaska Fairbanks 930 Koyukuk Dr,POB 757335 Fairbanks AK USA 99775
Citazione:
N. Takeuchi et al., "Structure, formation, and darkening process of albedo-reducing material (cryoconite) on a Himalayan glacier: A granular algal mat growing on the glacier", ARCT ANTARC, 33(2), 2001, pp. 115-122

Abstract

Dark-colored material (cryoconite) covering Himalayan glaciers has been reported to greatly accelerate glacier-melting by reducing surface albedo. Structure, formation, and the darkening process of the cryoconite on a Himalayan glacier were analyzed. The cryoconite was revealed to be a stromatolite-like algal mat, a product of microbial activity on the glacier. The granular algal mat contains filamentous blue-green algae (cyanobacteria) and bacteria, and grows on the ice by trapping mineral and organic particles. This structure seems to enable high algal production in nutrient poor glacial meltwater by gathering and keeping nutrient rich particles inside. The dark coloration of the mats promotes melt-hole formation on the ice (cryoconite holes), providing a semistagnant aquatic habitat for various algae and animals in the glacier. Optical and chemical analyses of the cryoconite stronglysuggests that their high light- absorbency (dark coloration) is mainly dueto dark-colored humic substances, residues from bacterial decomposition ofthe algal products and other organic matter. Our results strongly suggest that biological activity on the glacier substantially affects the albedo ofthe glacier surface. The structure of the algal mat seems to be important in the glacier ecosystem and biological process affecting glacier albedo.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/05/20 alle ore 16:51:26