Estimation of Antarctic ozone loss from ground-based total column measurements

first_imgThe passive tracer method is used to estimate ozone loss from ground-based measurements in the Antarctic. A sensitivity study shows that the ozone depletion can be estimated within an accuracy of ~4%. The method is then applied to the ground-based observations from Arrival Heights, Belgrano, Concordia, Dumont d’Urville, Faraday, Halley, Marambio, Neumayer, Rothera, South Pole, Syowa, and Zhongshan for the diagnosis of ozone loss in the Antarctic. On average, the ten-day boxcar average of the vortex mean ozone column loss deduced from the ground-based stations was about 55±5% in 2005–2009. The ozone loss computed from the ground-based measurements is in very good agreement with those derived from satellite measurements (OMI and SCIAMACHY) and model simulations (REPROBUS and SLIMCAT), where the differences are within ±3–5%. The historical ground-based total ozone observations in October show that the depletion started in the late 1970s, reached a maximum in the early 1990s and stabilised afterwards due to saturation. There is no indication of ozone recovery yet. At southern mid-latitudes, a reduction of 20–50% is observed for a few days in October–November at the newly installed Rio Gallegos station. Similar depletion of ozone is also observed episodically during the vortex overpasses at Kerguelen in October–November and at Macquarie Island in July–August of the recent winters. This illustrates the significance of measurements at the edges of Antarctica.last_img read more

Gbinije sits out 2nd half of SU win with back injury

first_img Facebook Twitter Google+ Published on December 14, 2014 at 7:58 pm Contact Phil: [email protected] | @PhilDAbb Forward Michael Gbinije sat out the second half of Syracuse’s (6-3) 71-69 victory over Louisiana Tech on Sunday due to a tightened back, head coach Jim Boeheim said after the game.All Gbinije said to a reporter before leaving the locker room after Boeheim’s press conference was that he injured his back.The junior connected on a pull-up jumper from the elbow with 6:58 left in the first half for his only two points in 14 minutes. He added two assists and a pair of rebounds.In his absence, forward Tyler Roberson played the entire second half and fellow sophomore forward B.J. Johnson logged 14 second-half minutes after just eight in the first.Although it’s unclear if Gbinije will be available for the Orange’s game at No. 7 Villanova on Saturday, SU forward Rakeem Christmas said the injury is “probably a small thing.”AdvertisementThis is placeholder text“It’s always a pleasure to have Mike going out there,” Christmas said. “He’s a forward, he’s a point guard, he brings the ball down … He’s a versatile player and not having him in the game is something, too, but everyone else stepped up and we had to do what we had to do.” Commentslast_img read more