Photocredit: SineadFarrell · Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation...
Transcript of Photocredit: SineadFarrell · Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation...
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Photo credit: Sinead Farrell
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Goals • Examine how heat is redistributed within glacier ice
as its boundary is heated or cooled
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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Goals • Examine how heat is redistributed within glacier ice
as its boundary is heated or cooled
T (z, t) = T0 +ΔTe−z ω
2κ sin ωt − z ω2κ
#
$%
&
'(
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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Goals • Examine how heat is redistributed within glacier ice
as its boundary is heated or cooled
• Plot the variation of temperature with depth
T (z, t) = T0 +ΔTe−z ω
2κ sin ωt − z ω2κ
#
$%
&
'(
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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Assumptions • Ice velocity is negligible • Advection is negligible • Ice is homogeneous • Ice is isotropic • Horizontal ice surface is heated uniformly
o (heat flow occurs only in the vertical direction)
• Ice can be treated as infinite half-space o Temperature far from surface equals T0 for all time t o (ice is really thick and influence of lower boundary on near-surface temperatures is not
important)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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Assumptions • Ice velocity is negligible • Advection is negligible • Ice is homogeneous • Ice is isotropic • Horizontal ice surface is heated uniformly
o (heat flow occurs only in the vertical direction)
• Ice can be treated as infinite half-space o Temperature far from surface equals T0 for all time t o (ice is really thick and influence of lower boundary on near-surface temperatures is not
important)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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Assumptions • Ice velocity is negligible • Advection is negligible • Ice is homogeneous • Ice is isotropic • Horizontal ice surface is heated uniformly
o (heat flow occurs only in the vertical direction)
• Ice can be treated as infinite half-space o Temperature far from surface equals T0 for all time t o (ice is really thick and influence of lower boundary on near-surface temperatures is not
important)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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Assumptions • Ice velocity is negligible • Advection is negligible • Ice is homogeneous • Ice is isotropic • Horizontal ice surface is heated uniformly
o (heat flow occurs only in the vertical direction)
• Ice can be treated as infinite half-space o Temperature far from surface equals T0 for all time t o (ice is really thick and influence of lower boundary on near-surface temperatures is not
important)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
![Page 9: Photocredit: SineadFarrell · Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014 . Goals1 • Examine how heat is redistributed within glacier ice as its](https://reader035.fdocuments.net/reader035/viewer/2022081617/604f74802935c05b7b7c5874/html5/thumbnails/9.jpg)
Assumptions • Ice velocity is negligible • Advection is negligible • Ice is homogeneous • Ice is isotropic • Horizontal ice surface is heated uniformly
o (heat flow occurs only in the vertical direction)
• Ice can be treated as infinite half-space o Temperature far from surface equals T0 for all time t o (ice is really thick and influence of lower boundary on near-surface temperatures is not
important)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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Assumptions • Ice velocity is negligible • Advection is negligible • Ice is homogeneous • Ice is isotropic • Horizontal ice surface is heated uniformly
o (heat flow occurs only in the vertical direction)
• Ice can be treated as infinite half-space o Temperature far from surface equals T0 for all time t o (ice is really thick and influence of lower boundary on near-surface temperatures is not
important)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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• Top ~15m of a glacier subject to: o Diurnal variations (solar) o Annual variations (solar &
atmospheric) o Longer variations (climate
changes)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
∂T∂t
=κ∂2T∂z2
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
∂T∂t
=κ∂2T∂z2
Y1 = −κωd 2Y2dy2
Y2 =κωd 2Y1dy2
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
∂T∂t
=κ∂2T∂z2
Y1 = −κωd 2Y2dy2
Y2 =κωd 2Y1dy2
d 4Y2dy4
+ω 2
κ 2 Y2 = 0
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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Y2 = c1ezα + c2e
−zα
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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Y2 = c1ezα + c2e
−zα
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
Temperature must be finite when z→∞
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Y2 = c1ezα + c2e
−zα
α 4 +ω 2
κ 2 Y2 = 0
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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Y2 = c1ezα + c2e
−zα
α 4 +ω 2
κ 2 Y2 = 0 α = −1± i2
"
#$
%
&'ωκ
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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α 4 +ω 2
κ 2 Y2 = 0 α = −1± i2
"
#$
%
&'ωκ
Y2 = b1e−(1+i) ω
2κz+ b2e
−(1−i) ω2κ
z
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
Y2 = c1ezα + c2e
−zα
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α 4 +ω 2
κ 2 Y2 = 0 α = −1± i2
"
#$
%
&'ωκ
Y2 = b1e−(1+i) ω
2κz+ b2e
−(1−i) ω2κ
z
Y2 = e−
ω2κ
zb1e
i ω2κ
z+ b2e
−i ω2κ
z"
#$$
%
&''
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
Y2 = c1ezα + c2e
−zα
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α 4 +ω 2
κ 2 Y2 = 0 α = −1± i2
"
#$
%
&'ωκ
Y2 = b1e−(1+i) ω
2κz+ b2e
−(1−i) ω2κ
z
Y2 = e−
ω2κ
zb1e
i ω2κ
z+ b2e
−i ω2κ
z"
#$$
%
&''
Y2 = e−
ω2κ
za1 cos
ω2κ
z+ a2 sinω2κ
z"
#$
%
&'
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
Y2 = c1ezα + c2e
−zα
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α 4 +ω 2
κ 2 Y2 = 0 α = −1± i2
"
#$
%
&'ωκ
Y2 = b1e−(1+i) ω
2κz+ b2e
−(1−i) ω2κ
z
Y2 = e−
ω2κ
zb1e
i ω2κ
z+ b2e
−i ω2κ
z"
#$$
%
&''
Y2 = e−
ω2κ
za1 cos
ω2κ
z+ a2 sinω2κ
z"
#$
%
&'
Y1 = e−
ω2κ
za3 cos
ω2κ
z+ a4 sinω2κ
z"
#$
%
&'
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
…repeat for Y1
Y2 = c1ezα + c2e
−zα
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Y2 = e−
ω2κ
za1 cos
ω2κ
z+ a2 sinω2κ
z"
#$
%
&'Y1 = e
−ω2κ
za3 cos
ω2κ
z+ a4 sinω2κ
z"
#$
%
&'
T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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Y2 = e−
ω2κ
za1 cos
ω2κ
z+ a2 sinω2κ
z"
#$
%
&'Y1 = e
−ω2κ
za3 cos
ω2κ
z+ a4 sinω2κ
z"
#$
%
&'
T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
Y1 = −κωd 2Y2dy2
Y2 =κωd 2Y1dy2
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a2 = a3a1 = −a4
Y2 = e−
ω2κ
za1 cos
ω2κ
z+ a2 sinω2κ
z"
#$
%
&'Y1 = e
−ω2κ
za3 cos
ω2κ
z+ a4 sinω2κ
z"
#$
%
&'
T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
Y1 = −κωd 2Y2dy2
Y2 =κωd 2Y1dy2
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a2 = a3a1 = −a4
Y2 = e−
ω2κ
za1 cos
ω2κ
z+ a2 sinω2κ
z"
#$
%
&'Y1 = e
−ω2κ
za3 cos
ω2κ
z+ a4 sinω2κ
z"
#$
%
&'
T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
Y1 = −κωd 2Y2dy2
Y2 =κωd 2Y1dy2
Y2 = e−
ω2κ
za1 cos
ω2κ
z+ a2 sinω2κ
z"
#$
%
&'Y1 = e
−ω2κ
za2 cos
ω2κ
z− a1 sinω2κ
z"
#$
%
&'
![Page 29: Photocredit: SineadFarrell · Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014 . Goals1 • Examine how heat is redistributed within glacier ice as its](https://reader035.fdocuments.net/reader035/viewer/2022081617/604f74802935c05b7b7c5874/html5/thumbnails/29.jpg)
Y2 = e−
ω2κ
za1 cos
ω2κ
z+ a2 sinω2κ
z"
#$
%
&'Y1 = e
−ω2κ
za3 cos
ω2κ
z+ a4 sinω2κ
z"
#$
%
&'
T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
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Y2 = e−
ω2κ
za1 cos
ω2κ
z+ a2 sinω2κ
z"
#$
%
&'Y1 = e
−ω2κ
za3 cos
ω2κ
z+ a4 sinω2κ
z"
#$
%
&'
T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
T (0, t) = T0 +ΔT sin(ωt)
T (∞, t) = T0
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Y2 = e−
ω2κ
za1 cos
ω2κ
z+ a2 sinω2κ
z"
#$
%
&'Y1 = e
−ω2κ
za3 cos
ω2κ
z+ a4 sinω2κ
z"
#$
%
&'
T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
T (0, t) = T0 +ΔT sin(ωt)
a1 = ΔTa2 = 0
T (∞, t) = T0
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Y2 = e−
ω2κ
za1 cos
ω2κ
z+ a2 sinω2κ
z"
#$
%
&'Y1 = e
−ω2κ
za3 cos
ω2κ
z+ a4 sinω2κ
z"
#$
%
&'
T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
Y2 = e−
ω2κ
zΔT cos ω
2κz+ a2 sin
ω2κ
z#
$%
&
'(Y1 = e
−ω2κ
za2 cos
ω2κ
z−ΔT sin ω2κ
z#
$%
&
'(
T (0, t) = T0 +ΔT sin(ωt)
a1 = ΔTa2 = 0
T (∞, t) = T0
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Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
Y2 = e−
ω2κ
zΔT cos ω
2κz
#
$%
&
'(Y1 = e
−ω2κ
z−ΔT sin ω
2κz
#
$%
&
'(
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T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
Y2 = e−
ω2κ
zΔT cos ω
2κz
#
$%
&
'(Y1 = e
−ω2κ
z−ΔT sin ω
2κz
#
$%
&
'(
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T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
T (z, t) = T0 +ΔTe−z ω
2κ sin(ωt)cosz ω2κ
− cos(ωt)sin z ω2κ
#
$%
&
'(
Y2 = e−
ω2κ
zΔT cos ω
2κz
#
$%
&
'(Y1 = e
−ω2κ
z−ΔT sin ω
2κz
#
$%
&
'(
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Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
sin ωt − z ω2κ
"
#$
%
&'
T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
T (z, t) = T0 +ΔTe−z ω
2κ sin(ωt)cosz ω2κ
− cos(ωt)sin z ω2κ
#
$%
&
'(
Y2 = e−
ω2κ
zΔT cos ω
2κz
#
$%
&
'(Y1 = e
−ω2κ
z−ΔT sin ω
2κz
#
$%
&
'(
![Page 37: Photocredit: SineadFarrell · Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014 . Goals1 • Examine how heat is redistributed within glacier ice as its](https://reader035.fdocuments.net/reader035/viewer/2022081617/604f74802935c05b7b7c5874/html5/thumbnails/37.jpg)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
T (z, t) = T0 +ΔTe−z ω
2κ sin ωt − z ω2κ
#
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&
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T (z, t) = T0 +Y1(z)cos(ωt)+Y2 (z)sin(ωt)
Y2 = e−
ω2κ
zΔT cos ω
2κz
#
$%
&
'(Y1 = e
−ω2κ
z−ΔT sin ω
2κz
#
$%
&
'(
T (z, t) = T0 +ΔTe−z ω
2κ sin(ωt)cosz ω2κ
− cos(ωt)sin z ω2κ
#
$%
&
'(
![Page 38: Photocredit: SineadFarrell · Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014 . Goals1 • Examine how heat is redistributed within glacier ice as its](https://reader035.fdocuments.net/reader035/viewer/2022081617/604f74802935c05b7b7c5874/html5/thumbnails/38.jpg)
Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014
![Page 39: Photocredit: SineadFarrell · Julia Ruth SIO 234 with Dr. David Sandwell Homework #3 Presentation Fall 2014 . Goals1 • Examine how heat is redistributed within glacier ice as its](https://reader035.fdocuments.net/reader035/viewer/2022081617/604f74802935c05b7b7c5874/html5/thumbnails/39.jpg)