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Ehn, Jens K; Mundy, Christopher John; Barber, David G; Hop, Haakon; Rossnagel, Andrea L; Stewart, Jeremy (2011): (Table 1) White ice and melt pond characteristics in Darnley and Franklin Bay, Canada [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.809476, Supplement to: Ehn, JK et al. (2011): Impact of horizontal spreading on light propagation in melt pond covered seasonal sea ice in the Canadian Arctic. Journal of Geophysical Research: Oceans, 116, C00G02, https://doi.org/10.1029/2010JC006908

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Abstract:
Melt pond covered sea ice is a ubiquitous feature of the summertime Arctic Ocean when meltwater collects in lower-lying areas of ice surfaces. Horizontal transects were conducted during June 2008 above and below landfast sea ice with melt ponds to characterize surface and bottom topography together with variations in transmitted spectral irradiance. We captured a rapid progression from a highly flooded sea ice surface with lateral drainage toward flaws and seal breathing holes to the formation of distinct melt ponds with steep edges. As the mass of the ice cover decreased due to meltwater drainage and rose upward with respect to the seawater level, the high-scattering properties of ice above the water level (i.e., white ice) were continuously regenerated, while pond waters remained transparent compared to underlying ice. The relatively stable albedos observed throughout the study, even as ice thickness decreased, were directly related to these surface processes. Transmission through the ice cover of incident irradiance in the 400-700 nm wave band ranged from 38% to 67% and from 5% to 16% beneath ponded and white ice, respectively. Our results show that this transmission varied not only as a function of surface type (melt ponds or white ice) areal coverage but also in relation to ice thickness and proximity to other surface types through the influence of horizontal spreading of light. Thus, in contrast to albedo, this implies that regional transmittance estimates need to consider melt pond size and shape distributions and variations in optical properties and thickness of the ice cover.
Project(s):
International Polar Year (2007-2008) (IPY)
Coverage:
Median Latitude: 69.892500 * Median Longitude: -124.757500 * South-bound Latitude: 69.820000 * West-bound Longitude: -125.900000 * North-bound Latitude: 69.970000 * East-bound Longitude: -123.620000
Date/Time Start: 2008-06-08T00:00:00 * Date/Time End: 2008-06-21T00:00:00
Event(s):
Darnley_Bay_Site1  * Latitude: 69.830000 * Longitude: -123.620000 * Date/Time Start: 2008-06-08T00:00:00 * Date/Time End: 2008-06-13T00:00:00 * Location: Amundsen Gulf, Canada * Campaign: IPY-4 (International Polar Year 2007-2008) * Method/Device: Ice measurement (ICEM)
Darnley_Bay_Site3  * Latitude: 69.820000 * Longitude: -123.650000 * Date/Time: 2008-06-18T00:00:00 * Location: Amundsen Gulf, Canada * Campaign: IPY-4 (International Polar Year 2007-2008) * Method/Device: Ice measurement (ICEM)
Franklin_Bay_Site2  * Latitude: 69.950000 * Longitude: -125.860000 * Date/Time: 2008-06-16T00:00:00 * Location: Amundsen Gulf, Canada * Method/Device: Ice measurement (ICEM)
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEvent
2 Sample typeSamp typeEhn, Jens K
3 DATE/TIMEDate/TimeGeocode
4 SiteSiteEhn, Jens K
5 FreeboardFreeboardmEhn, Jens Kwhite ice
6 Melt pond freeboardMelt pond freeboardmEhn, Jens K
7 Melt pond depthMelt pond depthmEhn, Jens K
8 Sea ice thicknessEsEsmEhn, Jens K
9 Ice draftDraftmEhn, Jens K
10 Water levelWLmEhn, Jens Kseawater
11 Irradiance, incident, photosynthetically activeEi_PARW/m2Ehn, Jens K
12 Irradiance, incidentEiµmol/m2/sEhn, Jens K
13 Transmittance, photosynthetically activeTm_PAR%Ehn, Jens Kmean, to depth of rope
14 Transmittance, photosynthetically activeTm_PAR%Ehn, Jens Kmin, to depth of rope
15 Transmittance, photosynthetically activeTm_PAR%Ehn, Jens Kmax, to depth of rope
16 Transmittance, photosynthetically activeTm_PAR%Ehn, Jens Kmean, at ice-ocean interface
17 Transmittance, photosynthetically activeTm_PAR%Ehn, Jens Kmin, at ice-ocean interface
18 Transmittance, photosynthetically activeTm_PAR%Ehn, Jens Kmax, at ice-ocean interface
19 TransmittanceTransmittance%Ehn, Jens Kof quanta, mean, at ice-ocean interface
20 TransmittanceTransmittance%Ehn, Jens Kof quanta, min, at ice-ocean interface
21 TransmittanceTransmittance%Ehn, Jens Kof quanta, max, at ice-ocean interface
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
174 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Event		2 
Samp type		3 
Date/Time		4 
Site		5 
Freeboard [m]
(white ice)		6 
Melt pond freeboard [m]		7 
Melt pond depth [m]		8 
EsEs [m]		9 
Draft [m]		10 
WL [m]
(seawater)		11 
Ei_PAR [W/m2]		12 
Ei [µmol/m2/s]		13 
Tm_PAR [%]
(mean, to depth of rope)		14 
Tm_PAR [%]
(min, to depth of rope)		15 
Tm_PAR [%]
(max, to depth of rope)		16 
Tm_PAR [%]
(mean, at ice-ocean interface)		17 
Tm_PAR [%]
(min, at ice-ocean interface)		18 
Tm_PAR [%]
(max, at ice-ocean interface)		19 
Transmittance [%]
(of quanta, mean, at ice-ocean...)		20 
Transmittance [%]
(of quanta, min, at ice-ocean ...)		21 
Transmittance [%]
(of quanta, max, at ice-ocean ...)
Darnley_Bay_Site1 White ice2008-06-08Site 10.071.351.270.39242.31106.514.27.615.18.014.47.6
Darnley_Bay_Site1White ice2008-06-11Site 10.161.251.080.54282.51288.813.77.014.77.414.17.1
Darnley_Bay_Site1White ice2008-06-13Site 10.161.211.050.53166.0752.712.25.913.06.212.46.0
Darnley_Bay_Site1Melt pond2008-06-08Site 10.0300.101.081.140.51243.21110.546.852.450.557.148.554.9
Darnley_Bay_Site1Melt pond2008-06-11Site 10.0200.060.880.920.70272.11240.345.454.749.960.648.258.6
Darnley_Bay_Site1Melt pond2008-06-13Site 10.0050.060.850.900.68164.5746.041.045.444.649.843.048.0
Franklin_Bay_Site2 White ice2008-06-16Site 20.171.771.600.30286.01302.86.32.27.42.26.92.1
Franklin_Bay_Site2Melt pond2008-06-16Site 20.0200.181.181.340.55285.01299.226.131.833.641.432.139.6
Darnley_Bay_Site3 White ice2008-06-18Site 30.171.030.850.15181.5824.118.89.820.010.819.210.3
Darnley_Bay_Site3Melt pond2008-06-18Site 30.0000.110.660.780.22182.9830.360.364.765.370.763.468.7
Franklin_Bay_Site4 White ice2008-06-21Site 40.131.381.250.24287.11309.811.36.212.06.511.46.1
Franklin_Bay_Site4Melt pond2008-06-21Site 40.0000.131.081.200.29287.31310.532.937.335.240.033.738.3