Measurement of ammonia emissions from temperate and sub-polar seabird colonies

first_imgThe chemical breakdown of marine derived reactive nitrogen transported to the land as seabird guano represents a significant source of ammonia (NH3) in areas far from other NH3 sources. Measurements made at tropical and temperate seabird colonies indicate substantial NH3 emissions, with emission rates larger than many anthropogenic point sources. However, several studies indicate that thermodynamic processes limit the amount of NH3 emitted from guano, suggesting that the percentage of guano volatilizing as NH3 may be considerably lower in colder climates. This study undertook high resolution temporal ammonia measurements in the field and coupled results with modelling to estimate NH3 emissions at a temperate puffin colony and two sub-polar penguin colonies (Signy Island, South Orkney Islands and Bird Island, South Georgia) during the breeding season. These emission rates are then compared with NH3 volatilization rates from other climates. Ammonia emissions were calculated using a Lagrangian atmospheric dispersion model, resulting in mean emissions of 5 μg m-2 s-1 at the Isle of May, 12 μg m-2 s-1 at Signy Island and 9 μg m-2 s-1 at Bird Island. The estimated percentage of total guano nitrogen volatilized was 5% on the Isle of May, 3% on Signy and 2% on Bird Island. These values are much smaller than the percentage of guano nitrogen volatilized in tropical contexts (31-65%). The study confirmed temperature, wind speed and water availability have a significant influence on the magnitude of NH3 emissions, which has implications for reactive nitrogen in both modern remote regions and pre-industrial atmospheric composition and ecosystem interactions.last_img read more

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A year long comparison of GPS TEC and global ionosphere-thermosphere models

first_imgThe prevalence of GPS total electron content (TEC) observations has provided an opportunity for extensive global ionosphere‐thermosphere model validation efforts. This study presents a year‐long data‐model comparison using the Global Ionosphere‐Thermosphere Model (GITM) and the Thermosphere‐Ionosphere‐Electrodynamics General Circulation Model (TIE‐GCM). For the entire year of 2010, each model was run and compared to GPS TEC observations. The results were binned according to season, latitude, local time, and magnetic local time. GITM was found to overestimate the TEC everywhere, except on the midlatitude nightside, due to high O/N2 ratios. TIE‐GCM produced much less TEC and had lower O/N2 ratios and neutral wind speeds. Seasonal and regional biases in the models are discussed along with ideas for model improvements and further validation efforts.last_img read more

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Multi-tracer study of gas trapping in an East Antarctic ice core

first_imgWe study a firn and ice core drilled at the new “Lock-In” site in East Antarctica, located 136 km away from Concordia station towards Durmont d’Urville. High resolution chemical and physical measurements were performed on the core, with a particular focus on the trapping zone of the firn where air bubbles are formed. We measured the air content in the ice, closed and open porous volumes in the firn, firn density, firn liquid conductivity and major ion concentrations, as well as methane concentrations in the ice. The closed and open porosity volumes of firn samples were obtained by the two independent methods of pycnometry and tomography, that yield similar results. The measured increase of the closed porosity with density is used to estimate the air content trapped in the ice with the aid of a simple gas trapping model. Results show a discrepancy, with the model trapping too much air. Experimental errors have been considered but do not explain the discrepancy between the model and the observations. The model and data can be reconciled with the introduction of a reduced compression of the closed porosity compared to the open porosity. Yet, it is not clear if this limited compression of closed pores is the actual mechanism responsible for the low amount of air in the ice. High resolution density measurements reveal the presence of a strong layering, manifesting itself as centimeter scale variations. Despite this heterogeneous stratification, all layers, including the ones that are especially dense or less dense compared to their surroundings, display similar pore morphology and closed porosity as function of density. This implies that all layers close in a similar way, even though some close in advance or later compared to the bulk firn. Investigation of the chemistry data suggests that in the trapping zone, the observed stratification is partly related to the presence of chemical impurities.last_img read more

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Bees Buzz Vegas

first_img FacebookTwitterLinkedInEmail(Salt Lake City, UT)  —  Luis Rengifo and Eric Young Junior each had three hits and drove in two runs as the Bees drubbed the Las Vegas 51s 10-5 at Smith’s Ballpark.Michael Hermosillo and Jared Walsh each contributed two hits and a pair of RBIs.The two teams will meet again tonight for the second game of the four-game series. Written by July 17, 2018 /Sports News – Local Bees Buzz Vegas Tags: Baseball/PCL/Salt Lake Bees Robert Lovelllast_img

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Australian Open: Novak Djokovic beats Lucas Pouille, will face Rafael Nadal in final

first_img Written by January 25, 2019 /Sports News – National Australian Open: Novak Djokovic beats Lucas Pouille, will face Rafael Nadal in final FacebookTwitterLinkedInEmailTPN/Getty Images(MELBOURNE, Australia) — The stage has been set for the Australian Open final on Sunday.Novak Djokovic advanced to the championship match on Friday after dominating France’s Lucas Pouille in three straight sets, 6-0, 6-2, 6-2, in the semifinals.Djokovic, the top seed in the world, will now face No. 2 seed Rafael Nadal as the two battle it out for the trophy on Sunday. Nadal, 32, advanced to the final on Thursday after defeating Greece’s Stefanos Tsitsipas 6-2, 6-4, 6-0.Djokovic, 31, is seeking his seventh Australian Open title and 15th Grand Slam victory overall. Nadal, meanwhile, is on the quest for his second win in Melbourne and 18th Grand Slam title.Copyright © 2019, ABC Radio. All rights reserved.center_img Beau Lundlast_img read more

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Jazz rout Trail Blazers for 23rd straight home victory

first_img Tags: NBA/Utah Jazz FacebookTwitterLinkedInEmailSALT LAKE CITY (AP) — Donovan Mitchell scored 37 points to lead the Utah Jazz to their 23rd straight home victory with a 122-103 victory over the Portland Trail Blazers.Rudy Gobert had 18 points and 21 rebounds, Joe Ingles added 13 points and six assists and Utah dominated the glass by outrebounding Portland 58-41 while snapping a two-game skid.Damian Lillard scored 23 points and C.J. McCollum added 19 to lead the Trail Blazers who lost for the third time in four games.Utah surged on offense in the third quarter when it erased a six-point deficit and built a double-digit lead while scoring 40 points. April 9, 2021 /Sports News – Local Jazz rout Trail Blazers for 23rd straight home victory Written by Associated Presslast_img read more

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Neptune Energy drills dry well near Heidrun field in Norwegian Sea

first_imgThe well was aimed to determine the presence of petroleum in Lower Jurassic reservoir rocks The wildcat well was terminated in the Åre Formation in the Lower Jurassic. (Credit: Pixabay/D Thory) Neptune Energy Norge and its partners have concluded the drilling of wildcat well 6507/8-10 S in the production licence 889 in the Norwegian Sea.Drilled about 10km east of the Heidrun field and 215km west of Brønnøysund, the well was aimed to prove the presence of petroleum in Lower Jurassic reservoir rocks (the Tilje and Åre Formations).The wildcat well has been drilled to a measured depth of 2,399m and a vertical depth of 2,311m, using West Phoenix drilling facility.Following drilling, the well encountered the Tilje Formation with a thickness of about 150m. The sandstones totalled about 100m with good to very good reservoir quality.Norwegian Petroleum Directorate (NPD) said that the Åre Formation at the well encountered a thickness of about 195m, with sandstone layers totalling around 100m with good to very good reservoir quality.Wildcat well 6507/8-10 S to be permanently plugged and abandonedSince the petroleum traces were not proven, the Well 6507/8-10 S has been declared dry. The well, which was terminated in the Åre Formation in the Lower Jurassic, is planned to be permanently plugged and abandoned.The production licence 889 is operated by Neptune Energy Norge with 50% stake while other partners include Wellesley Petroleum (20%), Equinor Energy (20%), and Sval Energi (10%).The West Phoenix drilling facility is scheduled to drill production wells on the Fenja field in production licence 586 in the Norwegian Sea.Recently, Neptune Energy and Wintershall Dea have made two hydrocarbon discoveries in northwestern Germany following the drilling of the Adorf Z15 gas well and the Ringe 6 oil well.last_img read more

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Schlumberger announces technology license agreement with CNPC Logging

first_img Santos signs new gas deal with Gold Fields. (Credit: Free-Photos from Pixabay.) Schlumberger announced today that it has entered into a collaboration agreement with China Petroleum Logging Co. Ltd (CNPC Logging), a subsidiary of China National Petroleum Corporation (CNPC), to jointly manufacture wireline downhole technology in China. The agreement will strengthen the commercial and technical collaboration between the two companies and aligns with Schlumberger’s commitment to enable technology access in key basins.The collaboration agreement will provide CNPC Logging with a license to manufacture fit-for-basin wireline technology. As part of the agreement, Schlumberger will support CNPC Logging on the manufacturing and sustaining activities for ThruBit through-the-bit logging technology at the CNPC Logging technology center in Xi’an, Shaanxi province.Djamel Idri, Wireline president, Schlumberger, said, “We are very pleased to continue evolving our relationship with CNPC Logging through this new technology access model, starting with ThruBit—one of our differentiated wireline technologies. This technology will enable CNPC Logging to significantly improve their logging capabilities in horizontal and vertical wells across all China basins. We look forward to continue working together with CNPC Logging to enhance value creation and performance through advanced wireline technologies.”Li Jianhao, president, CNPC Logging, commented, “CNPC Logging and Schlumberger have entered into an agreement to begin the co-manufacture of ThruBit logging tools marking a historic milestone in the relationship between the two companies. With the growing number of horizontal wells undertaken by CNPC each year, the ThruBit platform has become essential to our reservoir evaluation strategy. In today’s low oil price environment, this partnership is more important than ever and this new business model will help us to achieve mutual benefits. I look forward to strengthening the collaboration between our management and technical teams, to continue delivering high-quality products in order to keep improving the efficiency and performance of the CNPC oilfields.” Agreement will enable co-manufacture of wireline downhole technologylast_img read more

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New helicopter contract for Stavanger

first_img Sikorsky S-92 helicopter at the Gina Krog field in the North Sea. (Credit: Øyvind Gravås – Woldcam / Equinor ASA.) Equinor has awarded CHC Helikopter Service AS a contract for personnel transportation from Stavanger airport, Sola.The contract will run from 1 July 2021 for a fixed period of three years and includes three yearly options. The total value of the contract with options is estimated at NOK 1 billion.The contract covers crew change services with two Sikorsky S-92 helicopters, with a possibility to increase with one additional helicopter.In connection with this procurement, Equinor and Vår Energi have entered into a cooperation agreement and will share capacity on one of the helicopters.“We have good experience of cooperation with Vår Energi on joint procurement of helicopter services. The cooperation contributes to efficient use of helicopter capacity and increases flexibility for both companies. It also allows for better long-term planning from the service provider”, says Peggy Krantz-Underland, Equinor’s chief procurement officer.For Equinor, the helicopters will be used in connection with crew change services in the southern part of the North Sea, serving the fields Johan Sverdrup, Gina Krog, Sleipner, Grane, Gudrun, Heimdal and Draupner, as well as drilling rigs in the area.“Stavanger airport, Sola, is a cornerstone for our operations in the North Sea. About 50,000 passengers are annually transported from Sola to Equinor’s offshore installations and back. We look forward to cooperate with CHC and Vår Energi to deliver safe and efficient personnel transportation from Sola airport”, says Steinar Mathisen, responsible for aviation on the NCS for Equinor. Equinor uses six helicopter bases for personnel transportation services in Norway: Sola, Bergen, Florø, Kristiansund, Brønnøysund and Hammerfest Source: Company Press Releaselast_img read more

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Zoopla loses nearly a quarter of its agents

first_imgHome » News » Agencies & People » Zoopla loses nearly a quarter of its agents previous nextProducts & ServicesZoopla loses nearly a quarter of its agentsZoopla loses almost a quarter of its agents despite a noteworthy rise in website traffic.PROPERTYdrum1st June 20150635 Views Despite a significant increase in web traffic, a growing number of estate agents are cancelling their subscriptions to Zoopla to join rival site OnTheMarket.com (OTM).Shares in Zoopla Property Group (ZPG) dropped last week, after the firm reported that the number of estate agents listing their properties for sale and to let on the Zoopla website had dropped by 23 per cent over the past 12 months, largely due to the recent launch of OnTheMarket.com (OTM) which continues to have an adverse impact on its business.OTM, solely owned by the agents that list on the website, with more than 5,000 estate agency offices now signed up, has had a dramatic early impact on the market with its ‘one other portal’ rule requiring their member agents to stop advertising on either Rightmove or Zoopla, with the vast majority of agents opting to drop Zoopla.Ian Springett (left), Chief Executive of OTM, said, “Since our launch four months ago OnTheMarket.com has already taken almost one quarter of the estate and letting agent members from Zoopla Property Group. Less than 10 per cent of OnTheMarket.com’s member firms are using Zoopla as their other portal.”“In addition, OnTheMarket.com has already overtaken Zoopla in many areas across the UK with its number of property listings, meanwhile new member agents joining OnTheMarket.com continue to rise week on week,” he added.But despite losing almost a quarter of its estate agency advertisers, Zoopla reported a 10 per cent rise in revenues, suggesting that many agents continue to remain loyal to Zoopla, thanks in part to the fact that web traffic to Zoopla has increased by 11 per cent to an average monthly rate of 44.2 million.Lawrence Hall (right) of ZPG insists that the majority of agents who have remained with Zoopla and Rightmoveare in a “far stronger position” than those that have switched to OTM, “and are growing their market share as a result”.Analysis from ZPG claims that the average number of listings and new instructions per branch has been steadily climbing since the start of the year for agents who have remained with both Rightmove and ZPG, whilst the average number of listings per branch for agents who have joined (OTM) has been steadily falling.“This analysis provides compelling evidence of the impact of OTM’s ‘one-other portal rule’ on its members as many vendors and landlords clearly see the benefit of choosing an agent who provides the widest possible exposure for their home when entering the property market,” said Hall.He added, “It is no coincidence that we have already seen dozens of members return to ZPG having quit OTM due to the negative impact on their business and we welcome back any members who have realised that we are a key partner whose sole focus is on driving them more business.”But without more detail of this ZPG analysis, OTM’s Springett insists that it is “hard to take it seriously.”He continued, “It seems simply to be another desperate set of unsubstantiated claims geared to stemming the flow of agents away from it as they join OnTheMarket.com. The claims are directly contrary to the consistent feedback that leaving Zoopla has made no difference to instruction-winning capability.“The claims also seem to be at odds with announcements recently by Countrywide and LSL, both major shareholders in ZPG and with some 1,400 offices between them listed on Zoopla. As recently as 30th April it was reported that for first quarter 2015 compared with first quarter 2014, Countrywide experienced a 13 per cent fall in exchanges and LSL saw income from sales fall 15 per cent.“Meanwhile, Spicerhaart Group, a major group supporter of OnTheMarket.com, has announced a surge in new instructions.“Moreover, analysis published recently by Home.co.uk indicates that our member agents are selling the properties they are instructed on materially faster than those who remain non-members.”OTM rival site agents Zoopla June 1, 2015The NegotiatorWhat’s your opinion? Cancel replyYou must be logged in to post a comment.Please note: This is a site for professional discussion. Comments will carry your full name and company.This site uses Akismet to reduce spam. Learn how your comment data is processed.Related articles 40% of tenants planning a move now that Covid has eased says Nationwide3rd May 2021 Letting agent fined £11,500 over unlicensed rent-to-rent HMO3rd May 2021 BREAKING: Evictions paperwork must now include ‘breathing space’ scheme details30th April 2021last_img read more

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