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0.0 Oct Nov Aug Jul Sep Jun Apr Feb 0.5 May 1.04 1.5 Depth from 30 Dec 1992 Surface (m) 25 4. The Figure on the right shows measured monthly mean temperature as function of depth below the snow surface of an extensive ice sheet (from Brandt and Warren, J. Glaciology, 43, 144, 1997). Note that not every month is present. (a) Is the data taken from a snow surface at Greenland or at the South Pole? (b) Estimate the annual temperature range at the surface and at a depth of 3 m. Given what you have learned about how the amplitude of the temperature response changes with depth, give an approximate estimate the 8 2011 penetration depth d. (c) The mean density of the snow was measured to be 360 kg m-3 and the specific heat cof pure ice is 2.1x10 J kg K1. Use -50 45 Monthly Average Temperature (C) your estimate of the penetration depth to estimate the mean thermal conductivity of the Fig. 5. Monthly rege snow lmperature profiles for Feb. snow. Show how you made this estimate. Fuery through November 1992 The annual rege 2m air temperature is 19.5C (Schweden, 1977); the shore temperature at 10 m depth us-50.5(Dalrymple, 1966) Do you think the heat capacity of the air in between the snow grains is important? (d) From these data the authors were able to estimate the thermal conductivity k as a function of depth. This is shown in the figure below (solid squares with error bars). Why do you think that the conductivity might be reduced near the surface? (Bear in mind that all the snow below the depth (-0.5 m) where the conductivity becomes constant has experienced a whole summer). 3.0- 3.5 -65 -60 -55 -40 0.0 0.2- 0.4 Depth of Center Thermistor (m) 0.6 Anderson Yen This work 1.04 0.0 0.1 0.2 0.3 04 Conductivity ( WK) Fig. IL Aage conductivity of thermister group as a function of depth. Error ben indicate the remodeled conducting and many of deplete interferier for all periods Livindicale perelerisi badan density (Equa (9) and (10) Awing dutine anderd deur ahon ahwale med shown in Figure 2 0.0 Oct Nov Aug Jul Sep Jun Apr Feb 0.5 May 1.04 1.5 Depth from 30 Dec 1992 Surface (m) 25 4. The Figure on the right shows measured monthly mean temperature as function of depth below the snow surface of an extensive ice sheet (from Brandt and Warren, J. Glaciology, 43, 144, 1997). Note that not every month is present. (a) Is the data taken from a snow surface at Greenland or at the South Pole? (b) Estimate the annual temperature range at the surface and at a depth of 3 m. Given what you have learned about how the amplitude of the temperature response changes with depth, give an approximate estimate the 8 2011 penetration depth d. (c) The mean density of the snow was measured to be 360 kg m-3 and the specific heat cof pure ice is 2.1x10 J kg K1. Use -50 45 Monthly Average Temperature (C) your estimate of the penetration depth to estimate the mean thermal conductivity of the Fig. 5. Monthly rege snow lmperature profiles for Feb. snow. Show how you made this estimate. Fuery through November 1992 The annual rege 2m air temperature is 19.5C (Schweden, 1977); the shore temperature at 10 m depth us-50.5(Dalrymple, 1966) Do you think the heat capacity of the air in between the snow grains is important? (d) From these data the authors were able to estimate the thermal conductivity k as a function of depth. This is shown in the figure below (solid squares with error bars). Why do you think that the conductivity might be reduced near the surface? (Bear in mind that all the snow below the depth (-0.5 m) where the conductivity becomes constant has experienced a whole summer). 3.0- 3.5 -65 -60 -55 -40 0.0 0.2- 0.4 Depth of Center Thermistor (m) 0.6 Anderson Yen This work 1.04 0.0 0.1 0.2 0.3 04 Conductivity ( WK) Fig. IL Aage conductivity of thermister group as a function of depth. Error ben indicate the remodeled conducting and many of deplete interferier for all periods Livindicale perelerisi badan density (Equa (9) and (10) Awing dutine anderd deur ahon ahwale med shown in Figure 2