Since 2011, the older-than-four-year-old ice has comprised less than 5.5 percent of the Arctic Ocean. This is the same percentage as last year and contrasts starkly with the late 1980s when 30 to 35 percent of the Arctic Ocean’s ice was older than 4 years. Overall, there is almost no ice over four years old remaining-it now comprises just 3 percent of the total ice cover. The multiyear ice coverage has been variable since then, with no significant trend. This is much less than in the late 1980s when multiyear ice covered 60 to 65 percent of the Arctic Ocean.Ī rapid decline in multiyear ice coverage occurred after the then record 2007 September sea ice extent minimum. Multiyear ice covered 33.9 percent of the Arctic Ocean domain in the week of February 26 through March 4, 2023, slightly less than the 34.3 percent during the same week in 2022. As in recent years, there is far less multiyear ice (ice that has survived at least one summer melt season) and the oldest ice (ice that has survived several or more melt seasons) is nearly gone. Data and images from NSIDC EASE-Grid Sea Ice Age, Version 4 (Tschudi et al., 2019a) and Quicklook Arctic Weekly EASE-Grid Sea Ice Age, Version 1Īn important indicator of sea ice conditions is the sea ice age. The bottom graph is a timeseries of the percent of the sea ice extent within the Arctic Ocean domain (inset map) for the week of February 26 to March 4, 1985, through 2023 color categories are the same as in the maps. The top maps show sea ice age for the week of February 26 to March 4 for (a) 1985 and (b) 2023. Overall, extent decreased 170,000 square kilometers (65,600 square miles) during March 2023, compared to the 1981 to 2010 average March decrease of 220,000 square kilometers (84,900 square miles). Sea ice concentration within the ice pack was generally quite high in all areas, with the exception of the Sea of Okhotsk and the northern Barents Sea where the ice pack was more open. Lawrence, with smaller retreats in the Barents and Bering Seas. Ice extent was slightly below average in almost all areas, but particularly in the Sea of Okhotsk and in the Gulf of St. March monthly average extent was 990,000 square kilometers (382,000 square miles) below the 1981 to 2010 average of 15.43 million square kilometers (5.96 million square miles), but 150,000 square kilometers (57,900 square miles) above the record low set in March 2017 (Figure 1b).Īfter the March 6 seasonal maximum, extent declined for a week, but then remained almost constant during the second half of the month. The March 2023 average Arctic sea ice extent was 14.44 million square kilometers (5.58 million square miles), the sixth lowest March in the satellite record (Figure 1a). Sea Ice Index data.Ĭredit: National Snow and Ice Data Center The gray areas around the median line show the interquartile and interdecile ranges of the data. The graph above shows Arctic sea ice extent as of April 4, 2023, along with daily ice extent data for four previous years and the record low year. "Devin and Loma are sensational boxers, and I'm sure it will be a memorable fight.Figure 1b. "Devin Haney is the sport's brightest young superstar, and he's taking on a tremendous challenge against one of this generation's best pound-for-pound fighters in Vasiliy Lomachenko," said Top Rank chairman Bob Arum. Haney holds a perfect 29-fight record, including wins over respected veteran Jorge Linares and skilful Cuban Yuriorkis Gamboa, although a triumph over Lomachenko will take his growing reputation to a new high. I respect his boxing IQ and am excited for this challenge." Lomachenko said, "My goal is to become the undisputed lightweight champion, and Devin Haney is the man with the belts. Smith ready for Eubank but Brook is 'massive fight'īut the Ukrainian southpaw returned with a ruthless stoppage of Masayoshi Nakatani and then added two dominant points victories over Richard Commey and Jamaine Ortiz to sharpen his skills for Haney.
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