Assessing the contamination of SuperDARN global convection maps by non-F-region backscatter

first_imgGlobal convection mapping using line-of-sight Doppler velocity data from the Super Dual Auroral Radar Network (SuperDARN) is now an accepted method of imaging high-latitude ionospheric convection. This mapping process requires that the flow measured by the radars is defined solely by the convection electric field. This is generally only true of radar backscatter from the ionospheric F-region. We investigate the extent to which the E-region and ground backscatter in the SuperDARN data set may be misidentified as F-region backscatter, and assess the contamination of global convection maps which results from the addition of this non-F-region backscatter. We present examples which highlight the importance of identifying this contamination, especially with regard to the mesoscale structure in the convection maps.last_img read more

Consistency of the current global ocean observing systems from an Argo perspective

first_imgVariations in the world’s ocean heat storage and its associated volume changes are a key factor to gauge global warming and to assess the Earth’s energy budget. It is also directly link to sea level change, which has a direct impact on coastal populations. Understanding and monitoring heat and sea level change is therefore one of the major legacies of current global ocean observing systems. In this study, we present an inter-comparison of the three of these global ocean observing systems: the ocean temperature/salinity network Argo, the gravimeter GRACE and the satellite altimeters. Their consistency is investigated at global and regional scale during the period 2005–2010 of overlapping time window of re-qualified data. These three datasets allow closing the recent global ocean sea level budget within uncertainties. However, sampling inconsistencies need to be corrected for an accurate budget at global scale. The Argo network allows estimating global ocean heat content and global sea level and reveals a positive change of 0.5 ± 0.1W m−2 and 0.5 ± 0.1 mm yr−1 over the last 8 yr (2005–2012). Regional inter-comparison of the global observing systems highlights the importance of specific ocean basins for the global estimates. Specifically, the Indonesian Archipelago appears as a key region for the global ocean variability. Both the large regional variability and the uncertainties in the current observing systems, prevent us to shed light, from the global sea level perspective, on the climatically important deep ocean changes. This emphasises, once more, the importance of continuing sustained effort in measuring the deep ocean from ship platforms and by setting up a much needed automated deep-Argo network.last_img read more

Improvements to stratospheric chemistry scheme in the UM-UKCA (v10.7) model: solar cycle and heterogeneous reactions

first_imgImprovements are made to two areas of the United Kingdom Chemistry and Aerosol (UKCA) module, which forms part of the Met Office Unified Model (UM) used for weather and climate applications. Firstly, a solar cycle is added to the photolysis scheme. The effect on total column ozone of this addition was found to be around 1–2% in mid-latitude and equatorial regions in phase with the solar cycle. Secondly, reactions occurring on the surfaces of polar stratospheric clouds and sulfate aerosol are updated and extended by modification of the uptake coefficients of five existing reactions and the addition of a further eight reactions involving bromine species. These modifications are shown to reduce the overabundance of modeled total-column ozone in the Arctic during October to February, southern mid-latitudes during August, and the Antarctic during September. Antarctic springtime ozone depletion is shown to be enhanced by 25 DU on average, which now causes the ozone hole to be somewhat too deep compared to observations. We show that this is in part due to a cold bias of the Antarctic polar vortex in the model.last_img read more

Distribution and Habitat Preferences of the Newly Rediscovered Telmatogeton magellanicus (Jacobs, 1900) (Diptera: Chironomidae) on Navarino Island, Chile

first_imgThe habitat of the intertidal flightless midge Telmatogeton magellanicus (Jacobs, 1900) is described for the first time from the northern coast of Navarino Island, Tierra del Fuego, Chile. Additionally, we report the first observations of adult behaviour in the wild. We delineate the species’ distribution across three tidal zones (high, mid and low), and identify substrate characteristics that favour the presence of the midge. The mid-tide zone was the key habitat utilized by T. magellanicus, with lower densities in the low-tide zone and no presence in the high-tide zone. There was a strong association between the presence of larvae and filamentous algae, especially Bostrychia spp. and, to a lesser extent, Ulva spp., as well as between larvae and the presence of larger, more stable boulders. As a result, the species’ overall distribution was widespread but patchy. We suggest that the main limiting factor is the relative humidity experienced in different habitats. One of the most striking features of the behavioural observations during data collection was the extremely active adults, which suggests high energy expenditure over a very short period of time. This may be due to the limited time available to find mates in a single low-tide period, when adults have about three hours after emerging from the pupa to complete mating and oviposition before inundation by the tide. The data presented here provide a baseline for future studies on this species’ ecology, phenology, physiology and general biology.last_img read more

NCAA Tournament Final Four is set

first_img Beau Lund FacebookTwitterLinkedInEmailDigitalVision/Thinkstock(OMAHA, Neb.) — The field for the NCAA basketball tournament’s Final Four is set after Kansas defeated Duke, 85-81, in overtime Sunday.Joining Kansas in San Antonio for the semifinals are fellow No. 1 seed Villanova, as well as powerhouse Michigan, and the Cinderella story Ramblers of Loyola-Chicago.Loyola-Chicago has been the talk of the tournament so far, as they beat Kansas State, 78-62, on Saturday, becoming just the fourth No. 11 seed, and first since VCU in 2011, to reach the Final Four. The other two were George Mason in 2006 and Louisiana State in 1986.This is Loyola-Chicago’s second Final Four appearance. The first time was in 1963, when they went on to win the only championship in school history.The Ramblers will face No. 3 seed Michigan, who secured their eighth Final Four appearance by knocking off Florida State, 58-54.On the otherside of the bracket, a match-up of No. 1 seeds pits Kansas against Villanova, who are making their 15th and sixth Final Four appearances, respectively. The Final Four begins on Sunday, March 31 in San Antonio, as Loyola-Chicago takes on Michigan at 6:09 p.m. ET, followed by the Villanova-Kansas match-up at 8:49 p.m. ET.Copyright © 2018, ABC Radio. All rights reserved. Written bycenter_img March 25, 2018 /Sports News – National NCAA Tournament Final Four is setlast_img read more

Scoreboard roundup — 1/24/19

first_imgJanuary 25, 2019 /Sports News – National Scoreboard roundup — 1/24/19 Written by FacebookTwitterLinkedInEmailiStock(NEW YORK) — Here are the scores from Thursday’s sports events:NATIONAL BASKETBALL ASSOCIATIONGolden State 126, Washington 118Oklahoma City 122, New Orleans 116Portland 120, Phoenix 106Minnesota 120, L.A. Lakers 105TOP-25 COLLEGE BASKETBALL(4) Gonzaga 98, Santa Clara 39(6) Michigan St. 82, (19) Iowa 67(23) Louisville 84, (21) NC State 77Copyright © 2019, ABC Radio. All rights reserved.Copyright © 2019, ABC Radio. All rights reserved.center_img Beau Lundlast_img read more

Scoreboard roundup — 3/1/19

first_imgMarch 2, 2019 /Sports News – National Scoreboard roundup — 3/1/19 FacebookTwitterLinkedInEmailiStock(NEW YORK) — Here are the scores from Friday’s sports events:   INTERLEAGUE Final  Atlanta      4  Toronto       3 Final  N-Y Mets     7  Detroit       1 Final  Pittsburgh   1  Toronto       1 Final  Oakland      6  Colorado      3 Final  Seattle      7  Milwaukee     3 Final  St. Louis    4  Houston       4 Final  Cleveland    8  L-A Dodgers   4   ——   AMERICAN LEAGUE Final  Tampa Bay      10  Baltimore     5 Final  Minnesota       4  Boston        3 Final  Chi White Sox   8  Texas         5 Final  L-A Angels     10  Kansas City   7 Final  Baltimore       2  N-Y Yankees   2   ——   NATIONAL LEAGUE Final  Philadelphia    7  Pittsburgh    3 Final  Washington      5  Miami         4 Final  Chi Cubs       10  Arizona       2 Final  San Diego       5  L-A Dodgers   4 Final  San Francisco   5  Cincinnati    3   ——   NATIONAL BASKETBALL ASSOCIATION Final 4OT  Chicago      168  Atlanta     161 Final  Charlotte    123  Brooklyn    112 Final  Boston       107  Washington   96 Final  Toronto      119  Portland    117 Final  New Orleans  130  Phoenix     116 In 3rd  L.A. Clippers   87  Sacramento   82 In 3rd  L.A. Lakers     74  Milwaukee    67   ——   NATIONAL HOCKEY LEAGUE Final OT  Buffalo        4  Pittsburgh      3 Final  Washington     3  N-Y Islanders   1 Final  Philadelphia   6  New Jersey      3 Final  Montreal       4  N-Y Rangers     2 Final  Carolina       5  St. Louis       2 Final  Winnipeg       5  Nashville       3 In 2nd  Vegas      2  Anaheim    0 In 2nd  San Jose   2  Colorado   1   ——  TOP-25 COLLEGE BASKETBALLFinal  (21) Buffalo   77  Miami (Ohio)   69Copyright © 2019, ABC Radio. All rights reserved. Written bycenter_img Beau Lundlast_img read more

Zion Williamson to sit out final preseason game with sore right knee

first_img FacebookTwitterLinkedInEmailPhoto by Phil Ellsworth / ESPN Images(NEW ORLEANS) — First overall draft pick Zion Williamson will sit out the New Orleans Pelicans’ final preseason game with a sore right knee, the team announced Thursday.New Orleans is in New York City to take on the Knicks on Friday. Williamson did not travel with the team, and will undergo further testing. There was no immediate timetable for his return.In four preseason games, Williamson has averaged 23.3 points and 6.5 rebounds in 27.3 minutes.The 19-year-old missed most of the Las Vegas Summer League after suffering a bruise of his other knee. He had not missed any time during training camp.Copyright © 2019, ABC Audio. All rights reserved. Written by October 17, 2019 /Sports News – National Zion Williamson to sit out final preseason game with sore right kneecenter_img Beau Lundlast_img read more

NBA star Donovan Mitchell details coronavirus from isolation

first_imgMarch 16, 2020 /Sports News – National NBA star Donovan Mitchell details coronavirus from isolation Written by FacebookTwitterLinkedInEmailABC News(NEW YORK) — Donovan Mitchell is one of three NBA players who contracted the novel coronavirus and now, from isolation, the Jazz guard said “the scariest part about this virus” is that an infected person, like himself, can show no symptoms at all and spread it to others unknowingly. “I have no symptoms which is a unique — when people ask me I would say if you were to tell me I could play in a seven-game series tomorrow, I would be ready to lace up,” Mitchell told ABC News’ Robin Roberts during an exclusive interview on Good Morning America. “I’m just blessed to be able to be okay.” The 23-year-old NBA star, who showed no symptoms when he was first tested for COVID-19, said “things are going well” in isolation and he has “no fever, no symptoms as of right now.”“I’m asymptomatic — I could walk down the street if it wasn’t public knowledge that I was sick, you wouldn’t know it,” Mitchell said. “I think that’s the scariest part about this virus, is that you may seem fine, be fine and you never know who you may be talking to who they’re going home to.” For Mitchell, the testing itself was the most difficult part of the infection. “It was a swab down my throat. It was about 15 seconds of probably the most discomfort I ever had. I ended up crying,” he explained. “Tears came out of my eyes when they started going up in this area. It was definitely unique, but I’m glad I was able to get it.” His teammate Rudy Gobert was the first of three players in the league to test positive for the novel coronavirus, which prompted the NBA to suspend the season. The Jazz center faced backlash and apologized on Instagram after a video showed him touching microphones and recording devices after a shoot around last Monday that appeared to make light of the severity of the virus and the NBA’s temporary media restrictions at the time.Mitchell said “It took a while for me to kind of cool off and I read what he said and I heard what he said, so I’m glad he’s doing okay.” Mitchell added that he’s glad they are both doing well and grateful that “it’s just two of us” and that other players, staff and any of their families were not impacted. “At the end of the day neither him or I have children at home. I know I have teammates that have children, staff that have children at home, so I’m glad that we were able to kind of contain it as much as possible,” Mitchell explained. After Mitchell, Detroit Pistons center Christian Wood, who matched up against Gobert in Utah’s March 7 away win, was the next NBA player to test positive for COVID-19. Even from isolation though, Mitchell has found a way to help his community and give back amid growing concerns over coronavirus. “I’m working on a partnership with the Salt Lake Granite School District, that’s about 88 to 90 schools, about 66,000 kids, just being able to provide them meals,” Mitchell said. “That particular school district in Salt Lake City is home to some of the most vulnerable children” in the area, which is why Mitchell said he wants to give back.“For parents who may not have the money — being able to not send their kids off to school to get food, I think is a scary feeling for them and I want to be able to make sure that they’re set and they understand that guys like myself and whoever may have their back,” he said. In the meantime as he rides out his isolation, Mitchell said he has kept himself busy with video games, movies and even watched old basketball highlights of his college and early NBA days. “I’ve been doing a lot of that — It’s kind of bringing back good memories, but you miss the game, miss playing in front of some of the best fans in the world in the NBA,” he said.Copyright © 2020, ABC Audio. All rights reserved.center_img Beau Lundlast_img read more

Queta lifts Utah St. over UNLV 74-53 in MWC tourney

first_imgMarch 11, 2021 /Sports News – Local Queta lifts Utah St. over UNLV 74-53 in MWC tourney Tags: Mountain West/Mountain West Tournament/Neemias Queta/Utah State Aggies Basketball Associated Press FacebookTwitterLinkedInEmailLAS VEGAS (AP) — Neemias Queta posted 18 points and 13 rebounds as Utah State romped past UNLV 74-53 in the Mountain West Conference Tournament quarterfinals.Marco Anthony added 15 points and 13 rebounds for the Aggies on Thursday night.Bryce Hamilton led the Runnin’ Rebels with 16 points. Written bylast_img read more