Biogeosciences Discuss., 9, C693–C698, 2012
www.biogeosciences-discuss.net/9/C693/2012/
© Author(s) 2012. This work is distributed under
the Creative Commons Attribute 3.0 License.
Biogeosciences
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BGD
9, C693–C698, 2012
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Interactive comment on “Environmental factors
regulating winter CO<sub>2</sub> flux in
snow-covered boreal forest soil, interior Alaska”
by Y. Kim and Y. Kodama
Y. Kim
[email protected]
Received and published: 17 April 2012
We appreciate Referee #1’s invaluable suggestion regarding the estimation of winter
CO2 in the snow-covered high-latitude boreal forest soil of interior Alaska. We have
presented our findings on the effect of wind pumping when estimating CO2 flux in
boreal black spruce forest soil during the seasonally snow-covered period of 2006/7,
when the snow depth was at one of its lowest accumulations of the last 80 years. The
snow characteristics at our location were much more different than in subalpine and
temperate regions (characteristics such as changes in wind speed, accumulative snow
depth, soil temperature, soil moisture, and so on).
C693
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Here, the yellow highlighting indicates questions from Referee #1; however, highlighting
in the manuscript denotes portions corrected and/or changed, based on the underlined
responses here and as pointed out by Referee #1.
BGD
9, C693–C698, 2012
We have not added Figures S1-S4 in the manuscript without the approval of the Referee #1.
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Comment
âĂČ
I attached two supplements that one is ’Response on R1’ and the other is ’Response
on R1 in ext. Would you please see the supplementary files?
Please also note the supplement to this comment:
http://www.biogeosciences-discuss.net/9/C693/2012/bgd-9-C693-2012supplement.zip
Interactive comment on Biogeosciences Discuss., 9, 1129, 2012.
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C694
BGD
3.0
1040
2.5
1020
1000
2.0
980
1.5
1.0
U2m
Pressure
0.5
960
940
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Air Pressure (hPa)
Wind speed at 2 m (m/s)
9, C693–C698, 2012
920
0.0
900
305 315 325 335 345 355 365 375 385 395 405 415 425 435 445 455 465
DOY (366: January 1, 2007)
Figure S1. Temporal variations of wind speed at 2 m and air pressure measured by the eddy covariance
tower in black spruce forest of interior Alaska during the winter period of 2006-2007.
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Fig. 1. Temporal variations of wind speed at 2 m and air pressure measured by the eddy
covariance tower in black spruce forest of interior Alaska during the winter period of 2006-2007.
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9, C693–C698, 2012
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Comment
1030
16
1020
14
12
1000
dC/dz (ppmv/cm)
Pressure (hPa)
1010
990
980
970
960
10
8
6
4
950
y = 13.082x + 990.33
R² = 0.012; n=4501
940
y = 0.7798x + 7.567
R² = 0.06927
2
0
930
0.0
0.5
1.0
1.5
Wind speed at 2 m (m/s)
2.0
0.0
0.5
1.0
1.5
2.0
2.5
Wind speed at 2 m (m/s)
3.0
Figure S2. Relationships between a) air pressure and wind speed at 2m, and b) concentration gradients
and wind speed.
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Fig. 2. Relationships between a) air pressure and wind speed at 2m, and b) concentration
gradients and wind speed.
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Discussion Paper
BGD
9, C693–C698, 2012
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6000
5000
Frequmcy
4000
3000
2000
1000
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
Wind speed at 2m (m/s)
Figure S3. Frequency of wind speed at 2m (m/s) during the winter period of 2006/7.
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Fig. 3. Frequency of wind speed at 2m (m/s) during the winter period of 2006/7.
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BGD
9, C693–C698, 2012
CO2 concentration (ppm)
800
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10 cm
20 cm
30 cm
700
y = -31.339x2 + 23.523x + 626
R² = 0.00521
600
y = -16.17x2 + 11.141x + 531.68
R² = 0.0012
500
y = -108.6x2 + 65.81x + 469.96
R² = 0.01348
400
300
0.0
0.2
0.4
0.6
Wind speed at 2 m (m/s)
0.8
1.0
1.2
Figure S4. Relationship between CO2 concentration measured at each height in the snowpack and wind
speed 2m during the whole winter of 2006/7 with 2nd ploynomial fit equation (y = cx2 + bx + a) as shown
by Seok et al. (2009).
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Fig. 4. Relationship between CO2 concentration measured at each height in the snowpack and
wind speed 2m during the whole winter of 2006/7 with 2nd ploynomial fit equation (y = cx2 +
bx + a) as shown by Seok
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