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Variability in atmospheric O2 and CO2 concentrations in the southern Pacific Ocean and their comparison with model estimates

By on May 9, 2021

first_imgWe examine ship-based observations of atmospheric O-2 and CO2 in the southern Pacific Ocean made during two voyages: in February 2003 and in April 2004. We found, for the Austral late summer to autumn, evidence of a maximum in Atmospheric Potential Oxygen (APO) (an atmospheric tracer that is conservative with respect to terrestrial biological activity, APO approximate to O-2 + CO2) centered around 50 degrees S owing to biologically driven O-2 outgassing (associated with strong productivity in the Sub-Tropical Convergence Zone) and evidence in the February voyage of a decreasing APO trend from 57 degrees S south toward the Antarctic coast. The observed APO variability appears to be primarily determined by the interplay between atmospheric transport and the spatial distribution of O-2 air-sea flux resulting from regional differences in biological production. Comparisons of these observations with APO derived from coupling the TM3 atmospheric transport model with flux estimates from (1) the PISCES-T ocean biogeochemistry model, and (2) O-2 and CO2 climatologies, show that both PISCES-T and the climatology reproduce the observed gradient and curvature of APO but underestimate the magnitude of the observed APO maximum in the mid southern latitudes. Although the temporal limitation of our data does not permit us to calculate the annual mean APO gradient, the results support previous model predictions of a decreasing APO trend from the mid to high southern latitudes.last_img read more

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Gunmen attack Pakistani stock exchange, six killed: Police

By on October 19, 2020

first_imgTopics : Four gunmen attacked the Pakistani Stock Exchange building in the city of Karachi on Monday but security forces killed them all, police said.Two other people were also killed, the military said, adding that security forces were conducting a sweep for any remaining attackers.The gunmen attacked the building, which is in a high security zone that also houses the head offices of many private banks, with grenades and guns, said Ghulam Nabi Memon, chief of police in Pakistan’s biggest city and its financial hub. “Four attackers have been killed, they had come in a silver Corolla car,” Memon told Reuters.There was no immediate claim of responsibility.The gunmen initially threw a grenade at security men posted outside the stock exchange compound then opened fire on a security post. The four were killed when security forces posted there responded.Pakistan has long been plagued by Islamist militant violence but attacks have become less frequent in recent years after military operations against various factions in strongholds along the Afghan border.center_img The Pakistan Stock Exchange did not suspend trading during the attack, its managing director, Furrukh Khan, said.A Counter-Terrorism Department official told Reuters the attackers were carrying significant quantities of ammunition and grenades in backpacks.Apart from Islamist militants, Pakistan has also had to contend with separatist insurgents in Balochistan and Sindh provinces.Separatists were responsible for an attack on the Chinese consulate in Karachi in 2018.This month, three explosions on the same day claimed by a little-known separatist group killed four people including two soldiers in the southern province of Sindh, of which Karachi is capital.last_img read more

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Shanghai Shenhua give Ighalo condition to extend Man Utd loan deal

By on September 24, 2020

first_img It has been reported that Shanghai Shenhua will allow Ighalo’s loan deal to be extended as far as January, but only if the player ties down his future in China until 2024 in a deal worth £400,000 a week. read also:Ighalo’s agent confirms ‘very close’ to Man Utd agreement The striker is currently under contract until 2022 in Shanghai but the club are desperate to top his deal up with a further two years before they allow him to stay – and potentially impress – in the Premier League. FacebookTwitterWhatsAppEmail分享 Loading… Shanghai Shenhua are willing to allow Odion Ighalo to see out the Premier League season with a loan deal. Ighalo has impressed at Old Trafford His contract with Manchester United is due to expire on Sunday. Talks are ongoing over whether he will remain in England or leave to head back to China, but Sky Sports are reporting that his parent club have come up with a solution.Advertisementcenter_img Promoted Content10 Risky Jobs Some Women Do5 Of The World’s Most Unique Theme Parks6 Ridiculous Health Myths That Are Actually True14 Hilarious Comics Made By Women You Need To Follow Right Now8 Superfoods For Growing Hair Back And Stimulating Its GrowthA Soviet Shot Put Thrower’s Record Hasn’t Been Beaten To This DayWhich Celebrity Endorsement Deals Were Worth The Most?Top 6 Iconic Supercar MoviesThe Very Last Bitcoin Will Be Mined Around 2140. Read MorePortuguese Street Artist Creates Hyper-Realistic 3D GraffitiBest & Worst Celebrity Endorsed Games Ever MadeSome Impressive And Almost Shocking Robots That Existlast_img read more

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League overrun to cause club problems in Tipp

By on September 9, 2020

first_imgPhoto: Stephen Gleeson Tipp FM football analyst Conor O’Dwyer says the League overrun will cause problems at club level in Tipp. The Tipperary County Board is facing a major fixture headache for the club championships.It follows the rescheduling of the National Hurling and Football Leagues which will now stretch into next month following recent weather enforced cancellations.The Tipp hurlers will face Dublin in their quarter final at Croke Park on Sunday while the footballers will meet Cavan in Round 7 of the League in Kingspan Breffni Park.last_img read more

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