1
Arctic sea ice / Re: Latest PIOMAS update (March)
« on: March 05, 2021, 05:12:33 PM »
I have started to process Wipneus' data files on NSIDC area and extent. In my universe 29 Feb does not exist so I deleted those days. The Wipneus regional analysis uses a wider boundary than NSIDC for the Central Arctic Basin, which signifcantly reduces the area of the Beaufort, Chukchi, ESS and Laptev seas (see attached last image).
NSIDC also include part of the Sea of Japan in their Okhosk data, while this is shown separately in the Wipneus area and extent data.
Qu: Does the Wipneus volume data in the Regional files for the Okhotsk Sea include or exclude Sea of japan volume?
Using Wipneus defined boundaries for both volume and area data allows a meaningful calculation of thickness over time. As we have monthly regional data of volume back to 1979, and monthly area data tables are relatively simple to construct from daily data, it is possible to graph trends in volume and thickness going back to 1979. The downside is that short-term daily variations are smoothed away. I attach the thickness graph from daily changes to demonstrate (complete with ghastly colour scheme).
I attach graphs for the CAB going back to 1979.
click image to enlarge
NSIDC also include part of the Sea of Japan in their Okhosk data, while this is shown separately in the Wipneus area and extent data.
Qu: Does the Wipneus volume data in the Regional files for the Okhotsk Sea include or exclude Sea of japan volume?
Using Wipneus defined boundaries for both volume and area data allows a meaningful calculation of thickness over time. As we have monthly regional data of volume back to 1979, and monthly area data tables are relatively simple to construct from daily data, it is possible to graph trends in volume and thickness going back to 1979. The downside is that short-term daily variations are smoothed away. I attach the thickness graph from daily changes to demonstrate (complete with ghastly colour scheme).
I attach graphs for the CAB going back to 1979.
click image to enlarge