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Politics : Formerly About Advanced Micro Devices

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To: IC720 who wrote (1222115)	4/18/2020 9:59:52 PM
From: Wharf Rat	1 Recommendation Recommended By sylvester80 Read Replies (1) of 1583210

"Yet they pretend that if the Arctic Ocean melted the sea levels would rise and flood places even like Miami" If all the ice in the Arctic Ocean melted, sea levels will rise approximately 0.00 mm, cuz it's sea ice, not land ice; but you know that. Annual Update 2019 finished with an annually averaged sea ice volume that was the 2nd lowest on record with 13,500 km 3 , about 600 km 3 above the 2017 record with very similar volume numbers for recent low annual volume years (2011,2012,2016, 2017). March 2020 Monthly Update Average Arctic sea ice volume in March 2020 was 22,700 km3. This value is 2100 km3 above the record minimum value of 20,600 km3 set in 2017, making it the sixth lowest on record. Monthly ice volume was 39% below the maximum in 1979 and 26% below the mean value for 1979-2019. March 2020 ice volume falls 0.8 standard deviations above the trend line. Daily volume anomalies for March show a drop off from rapid growth in recent days (Fig 4). Average ice thickness is in the middle of the pack for the more recent years (Fig 5). Ice thickness anomalies for March 2020 relative to 2011-2018 (Fig 6) show relatively thin ice along the Russian Coast and thicker than normal sea ice in the Barents sea. February ice thickness anomalies from PIOMAS agree well with the multi-sensor CryoSat/SMOS thickness analysis from the Alfred Wegener Institute/ESA (Fig 7) with the strongest positive and negative anomalies in the right places. However CryoSat/SMOS shows more negative anomalies in the Beaufort/Chukchi sea while PIOMAS shows no anomaly in that area. There is some thickening of ice just north of Greenland which is absent in the CryoSat/SMOS thickness anomaly. Discrepancies between PIOMAS and CryoSat retrievals in this area, though of opposite sign appeared last year and we’ll be watching this closely. A thickening in this area is consistent with the advection of sea ice during February discussed below. The time series for CryoSat/SMOS data shows total volume for March 2020 substantially lower than PIOMAS with March 2020 near record low levels over the 2011-2020 period ( see also) but neither time series indicates a trend over the past 10 years contrasting the drastic thinning over the last 40-years. Note that CS2 retrievals are preliminary near real time products for March 2020. February featured a Northern Hemisphere circulation with a record level positive Arctic Oscillation Index. ( index data). Associated with this weather pattern is low pressure over the Eastern side of the Arctic which affects the sea ice motion and advection. February ice motion shows sea ice moving away from a small Beaufort Gyre and cyclonic sea ice motion along the East Siberian Sector of the Arctic moving sea ice away from the coast there (Fig 8) resulting in thinning there. The drift pattern also generates anomalous strong advection (Fig 9) and resulting gains towards in areas of typically thicker ice along the northern coast of Canada and Greenland. Updates will be generated at approximately one-month intervals. psc.apl.uw.edu

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