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Messages - guygee

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Arctic sea ice / Re: Arctic Image of the Day
« on: August 26, 2018, 12:58:50 AM »
Paper describing extent of the Ward Hunt Ice shelf and major calving, 1961-1962:
https://www.igsoc.org/journal/4/34/igs_journal_vol04_issue034_pg415-424.pdf

Major crack in Ward Hunt Ice shelf reported by NASA:
https://www.nasa.gov/missions/earth/f_iceshelf.html

Discussion of state of Ward Hunt Ice shelf on this forum, 2013, unfortunate that many image links are broken:
https://forum.arctic-sea-ice.net/index.php?topic=219.0

2
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: August 16, 2018, 03:35:20 AM »
I created an account here:
https://search.earthdata.nasa.gov/search
Searched on cryosphere->sea ice->extent and AMSR2,
there is a data set:
AMSR2 DAILY L3 12.5 KM TB AND SEA ICE CONCENTRATION POLAR GRIDS V0
The latest file can be displayed, it is this one, from today:
AMSR_2_L3_SeaIce12km_P00_20180815.he5

I don't have the software to display it myself. I'm not sure why other sites are not updating.
Hope that helps.


3
Arctic sea ice / Re: The 2018 melting season
« on: July 24, 2018, 11:26:12 PM »
Pretty sure this was not relevant to the immediate prior discussion but it got me thinking about Kelvin waves propagating along the shore in the Arctic Ocean, where subsequent upwelling (downwelling) could certainly affect melting. I found this reference interesting,

E.C. Carmack and E. A. Kulikov, (cited by 72)
"Wind-forced upwelling and internal Kelvin wave generation in Mackenzie Canyon, Beaufort Sea", J. of Geophsyical Research, V.103, No.9, pp. 18447-18458, Aug. 1998.

"We here first describe two major upwelling events observed in Mackenazie Canyon in Autumn 1987 (S.3). We then use spectral methods to establish a correlation between upwelling events and a wind field (S.4). Finally, we argue that upwelling within the the canyon generates an internal Kelvin (coastal trapped free) wave that subsequently propagates northeastward along the continental margin."

Reading on to section 5: "The negative correlation for alongshore winds means that the alongshore wind in the northeast (southwest) direction causes isopycnal elevation (depression)."
..."The maximum response of ED to wind forcing is about 4.5 m/(km h^-1) at site SS4 in Mackenzie Canyon."

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