Mass Balance Assessment for Mercury in Lake Champlain

2006 ◽  
Vol 40 (1) ◽  
pp. 82-89 ◽  
Author(s):  
Ning Gao ◽  
N. Gabriel Armatas ◽  
James B. Shanley ◽  
Neil C. Kamman ◽  
Eric K. Miller ◽  
...  
Keyword(s):  
Mass Balance ◽  
Balance Assessment ◽  
Lake Champlain

scholarly journals Mass-Balance Studies of Gara Glacier

1977 ◽  
Vol 18 (80) ◽  
pp. 415-423 ◽  
Author(s):  
V. K. Raina ◽  
M. K. Kaul ◽  
Surinder Singh
Keyword(s):  
Mass Balance ◽  
Western Himalaya ◽  
Balance Assessment ◽  
Valley Glacier ◽  
One Year

AbstractThe Gara Glacier, a north-facing valley glacier situated in the western Himalaya, was selected to be part of the study undertaken by India in connection with the International Hydrological Decade. This paper deals with the procedure adopted and the results obtained for mass-balance assessment over a period of one year between September 1974 and September 1975. The glacier has recorded a positive net balance of the order of 2.48 X 106 m3 in terms of water equivalent.

scholarly journals Utility of late summer transient snowline migration rate on Taku Glacier, Alaska

2011 ◽  
Vol 5 (4) ◽  
pp. 1127-1133 ◽  
Author(s):  
M. Pelto
Keyword(s):  
Mass Balance ◽  
Migration Rate ◽  
Satellite Images ◽  
Snow Water Equivalent ◽  
Late Summer ◽  
Ablation Rate ◽  
Field Observations ◽  
Balance Assessment ◽  
Snow Water ◽  
The Mean

Abstract. On Taku Glacier, Alaska a combination of field observations of snow water equivalent (SWE) from snowpits and probing in the vicinity of the transient snowline (TSL) are used to quantify the mass balance gradient. The balance gradient derived from the TSL and SWE measured in snowpits at 1000 m from 1998–2010 ranges from 2.6–3.8 mm m−1. Probing transects from 950 m–1100 m directly measure SWE and yield a slightly higher balance gradient of 3.3–3.8 mm m−1. The TSL on Taku Glacier is identified in MODIS and Landsat 4 and 7 Thematic Mapper images for 31 dates during the 2004–2010 period to assess the consistency of its rate of rise and reliability in assessing ablation for mass balance assessment. For example, in 2010, the TSL was 750 m on 28 July, 800 m on 5 August, 875 m on 14 August, 925 m on 30 August, and 975 m on 20 September. The mean observed probing balance gradient was 3.3 mm m−1, combined with the TSL rise of 3.7 m day−1 yields an ablation rate of 12.2 mm day−1 from mid-July to mid-Sept, 2010. The TSL rise in the region from 750–1100 m on Taku Glacier during eleven periods each covering more than 14 days during the ablation season indicates a mean TSL rise of 3.7 m day−1, the rate of rise is relatively consistent ranging from 3.1 to 4.4 m day−1. This rate is useful for ascertaining the final ELA if images or observations are not available near the end of the ablation season. The mean ablation from 750–1100 m during the July–September period determined from the TSL rise and the observed balance gradient is 11–13 mm day−1 on Taku Glacier during the 2004–2010 period. The potential for providing an estimate of bn from TSL observations late in the melt season from satellite images combined with the frequent availability of such images provides a means for efficient mass balance assessment in many years and on many glaciers.

scholarly journals Mass-Balance Studies of Gara Glacier

1977 ◽  
Vol 18 (80) ◽  
pp. 415-423 ◽  
Author(s):  
V. K. Raina ◽  
M. K. Kaul ◽  
Surinder Singh
Keyword(s):  
Mass Balance ◽  
Western Himalaya ◽  
Balance Assessment ◽  
Valley Glacier ◽  
One Year

AbstractThe Gara Glacier, a north-facing valley glacier situated in the western Himalaya, was selected to be part of the study undertaken by India in connection with the International Hydrological Decade. This paper deals with the procedure adopted and the results obtained for mass-balance assessment over a period of one year between September 1974 and September 1975. The glacier has recorded a positive net balance of the order of 2.48 X 106m3in terms of water equivalent.

scholarly journals Surficial Glaciology of Jakobshavns Isbræ, West Greenland: Part II. Ablation, accumulation and temperature

1992 ◽  
Vol 38 (128) ◽  
pp. 169-181 ◽  
Author(s):  
Κ. Echelmeyer ◽  
W. D. Harrison ◽  
T. S. Clarke ◽  
C. Benson
Keyword(s):  
Temperature Gradient ◽  
Mass Balance ◽  
Fast Moving ◽  
Significant Variation ◽  
Drainage Basin ◽  
Balance Assessment ◽  
Ice Stream ◽  
Cooling Effects ◽  
Basal Melting ◽  
Lateral Temperature

AbstractAccumulation studies along the lowermost 100 km of Jakobshavns Isbræ show that the local net balance above the equilibrium line (1210 m elevation in 1986) is significantly less than that measured along the EGIG line about 100 km further north. This indicates the presence of a precipitation low in this region which will affect any global mass-balance assessment for the Jakobshavns Isbræ drainage basin. Comparison of the estimated calving and ablation fluxes shows that calving removes about twice as much mass from this drainage basin as does melting. Basal melting over the entire basin accounts for about 20% of the total ice loss by ablation. Temperature measurements at 12 m depth along the same section of the Isbræ show the warming effects of refreezing meltwater and cooling effects of severe crevassing. In addition, there is a significant variation in temperature across the fast-moving ice stream which is probably caused by deformation heating in the shear margins which delineate the ice stream within the ice sheet. This lateral temperature gradient could be important in ice-stream dynamics through its effects on ice rheology. Detailed measurements within the percolation fades show that surface melt can penetrate up to 3 m by piping in cold firn, and, upon refreezing, can cause significant warming at these depths.

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