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Titolo:
Interannual variability of summer sea ice thickness in the Siberian and central Arctic under different atmospheric circulation regimes
Autore:
Haas, C; Eicken, H;
Indirizzi:
Alfred Wegener Inst Polar & Marine Res, D-27570 Bremerhaven, Germany Alfred Wegener Inst Polar & Marine Res Bremerhaven Germany D-27570 rmany Univ Alaska, Inst Geophys, Fairbanks, AK 99775 USA Univ Alaska Fairbanks AK USA 99775 Inst Geophys, Fairbanks, AK 99775 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
fascicolo: C3, volume: 106, anno: 2001,
pagine: 4449 - 4462
SICI:
0148-0227(20010315)106:C3<4449:IVOSSI>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
LAPTEV SEA; BEAUFORT SEA; OCEAN; TRANSPORT; WINTER; COVER; OSCILLATION; EXPORT; SYSTEM; MOTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Haas, C Alfred Wegener Inst Polar & Marine Res, Bussestr 24, D-27570 Bremerhaven, Germany Alfred Wegener Inst Polar & Marine Res Bussestr 24 Bremerhaven Germany D-27570
Citazione:
C. Haas e H. Eicken, "Interannual variability of summer sea ice thickness in the Siberian and central Arctic under different atmospheric circulation regimes", J GEO RES-O, 106(C3), 2001, pp. 4449-4462

Abstract

Extensive drill hole and electromagnetic induction measurements of sea icethickness in the Siberian and central Arctic Seas in the summers of 1993, 1995, and 1996 reveal significant interannual variability. In the Laptev Sea, minimum and maximum modal first-year ice thicknesses amounted to 1.25 and 1.85 m in 1995 and 1996, respectively. Ice thickness correlates with ice extent, which reached a record minimum in August 1995 and was well above average in 1996. These differences are explained by the strength and locationof a summer cyclonic atmospheric circulation pattern affecting both ice advection and surface melt. From drifting buoys deployed in 1995 and satellite radar backscatter data, first- and second-year ice regimes are delineated. Differences in first-year ice backscatter coefficients between 1993, 1995, and 1996 are explained by differences in level ice surface roughness. TheLagrangian evolution of ice thickness between 1995 and 1996 is studied. While the shape of the thickness distribution does not change significantly, the mean (modal) ice thickness of the ice field increases from 1.80 m (1.25m) in 1995 to 2.86 m (2.25 m) in 1996. The thickness distribution of second-year ice in 1996 closely agrees with that of level multiyear ice downstream in the Transpolar Drift obtained in 1991, In 1996, mean level ice thickness increases at 0.23 and 0.16 m deg(-1) with latitude in the Kara and Laptev Sea sectors of the Arctic Ocean, respectively.

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Documento generato il 19/01/20 alle ore 09:10:43