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Record #164676:

Estimating South Cascade Glacier (Washington, U.S.A.) mass balance from a distant radiosonde and comparison with Blue Glacier / L.A. Rasmussen, H. Conway.

Title: Estimating South Cascade Glacier (Washington, U.S.A.) mass balance from a distant radiosonde and comparison with Blue Glacier / L.A. Rasmussen, H. Conway.
Author(s): Rasmussen, L. A.
Conway, H.
Date: 2001.
In: Journal of Glaciology. (2001.), Vol. 47(159) (2001)
Abstract: Describes use of model to estimate winter balance of South Cascade Glacier, Washington. Uses twice-daily radiosonde measurements of wind, humidity and temperature from standard upper-air levels 275 km west of the glacier. Assumes snowfall at glacier proportional to moisture flux at radiosonde station at 850 mbar level in a critical direction to be determined. Assumes glacier-radiosonde temperature difference constant over elevation range of glacier and uses inferred glacier temperature to determine phase of precipitation. Regresses observed total winter balances for years 1959-98 against estimated snow flux for a range of glacier elevations and critical directions. Snow flux estimated for 1650 m, just above the glacier terminus, provides best fit. Investigates relation between vertical profiles of snow flux and observed winter balance and correlations between net, winter and summer balances. Examines trends in mass balance and local climate, identifying an almost step warming and drying in 1976-77. Compares mass-balance histories of South Cascade Glacier and Blue Glacier and their responses to 1976-77 change. Concludes both are well out of equilibrium with current climate. Notes model could easily be used to predict mass balance responses to future climate scenarios from circulation models.
Notes:

Journal of Glaciology. Vol. 47(159) :579-588 (2001).

Keywords: 551.32 -- Glaciology.
551.324 -- Land ice.
551.324.4 -- Land ice, mass and energy balance.
551.324.22 -- Glaciers: Blue Glacier.
551.324.22 -- Glaciers: South Cascade Glacier.
551.508.822 -- Radio-sondes.
551.5 -- Meteorology.
519.673 -- Modelling.
E5 -- Glaciology: land ice.
(73) -- United States.
(79) -- Pacific states.
(237.1) -- Rockies and other mountains of western North America.
SPRI record no.: 164676

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100 1# ‡aRasmussen, L. A.
245 10 ‡aEstimating South Cascade Glacier (Washington, U.S.A.) mass balance from a distant radiosonde and comparison with Blue Glacier /‡cL.A. Rasmussen, H. Conway.
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500 ## ‡aJournal of Glaciology. Vol. 47(159) :579-588 (2001).
520 3# ‡aDescribes use of model to estimate winter balance of South Cascade Glacier, Washington. Uses twice-daily radiosonde measurements of wind, humidity and temperature from standard upper-air levels 275 km west of the glacier. Assumes snowfall at glacier proportional to moisture flux at radiosonde station at 850 mbar level in a critical direction to be determined. Assumes glacier-radiosonde temperature difference constant over elevation range of glacier and uses inferred glacier temperature to determine phase of precipitation. Regresses observed total winter balances for years 1959-98 against estimated snow flux for a range of glacier elevations and critical directions. Snow flux estimated for 1650 m, just above the glacier terminus, provides best fit. Investigates relation between vertical profiles of snow flux and observed winter balance and correlations between net, winter and summer balances. Examines trends in mass balance and local climate, identifying an almost step warming and drying in 1976-77. Compares mass-balance histories of South Cascade Glacier and Blue Glacier and their responses to 1976-77 change. Concludes both are well out of equilibrium with current climate. Notes model could easily be used to predict mass balance responses to future climate scenarios from circulation models.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.324.4 -- Land ice, mass and energy balance.‡2udc
650 07 ‡a551.324.22 -- Glaciers: Blue Glacier.‡2udc
650 07 ‡a551.324.22 -- Glaciers: South Cascade Glacier.‡2udc
650 07 ‡a551.508.822 -- Radio-sondes.‡2udc
650 07 ‡a551.5 -- Meteorology.‡2udc
650 07 ‡a519.673 -- Modelling.‡2udc
650 07 ‡aE5 -- Glaciology: land ice.‡2local
651 #7 ‡a(73) -- United States.‡2udc
651 #7 ‡a(79) -- Pacific states.‡2udc
651 #7 ‡a(237.1) -- Rockies and other mountains of western North America.‡2udc
700 1# ‡aConway, H.
773 0# ‡7nnas ‡tJournal of Glaciology. ‡gVol. 47(159) (2001) ‡wSPRI-20534
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