Thursday November 15, 2018
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World climate on the brink of large-scale change, says international study

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By NewsGram Staff Writer

The global climate is on the verge of broad-scale change that could last for a number of decades, shows a study by British scientists.

The change is linked to cooling of the Atlantic, and is likely to bring drier summers in Britain and Ireland.

The study, which appeared in the journal Nature, is based on observational evidence of the link between ocean circulation and the decadal variability of sea surface temperatures called the Atlantic Multi-decadal Oscillation (AMO).

“Sea-surface temperatures in the Atlantic vary between warm and cold over time-scales of many decades. These variations have been shown to influence temperature, rainfall, drought and even the frequency of hurricanes in many regions of the world,” said lead author Gerard McCarthy from the National Oceanography Centre (NOC).

These climatic phases are the result of the movement of heat northwards by a system of ocean currents. This movement of heat changes the temperature of the sea surface, which has a profound impact on climate on time-scales of 20-30 years.

The strength of ocean currents has been measured by a network of sensors, called the RAPID array, which have been collecting data on the flow rate of the Atlantic meridonal overturning circulation (AMOC) for a decade. The authors used 100 years of sea level data, maintained by the National Oceanography Centre’s permanent service for mean sea level.

“By reconstructing ocean circulation over the last 100 years from tide gauges that measure sea level at the coast, we have been able to show, for the first time, observational evidence of the link between ocean circulation and the AMO,” said co-author Ivan Haigh, lecturer in coastal oceanography at the University of Southampton.

 

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Old Diesel Cars Banned From Summer 2019 In Greater Paris

Fifteen French metropolitan areas including Lyon, Nice, Aix-Marseille and Toulouse last month agreed to install or reinforce low-emission zones by 2020.

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Exhaust fumes escape from the exhaust of a diesel engine car in Paris. VOA

The Greater Paris region will become a low-emission zone from next summer, which will limit the circulation of old diesel cars, the regional authority decided on Monday.

The Metropole du Grand Paris council said on its Twitter feed it had voted to ban diesel cars registered before Dec. 31, 2000 from the area within the A86 second ring-road, which includes Paris and 79 municipalities around it, a region with 5.61 million inhabitants.

The ban will use France’s new “Crit’Air” vignette system, which identifies cars’ age and pollution level with color-coded stickers. Cars with the Crit’Air 5 sticker (1997 to 2000-registered diesels) as well as cars without a sticker will be banned.

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People cool themselves at the Trocadero Fountain in front of The Eiffel Tower in Paris on July 27, 2018, as a heatwave continues across northern Europe. VOA

The council plans to gradually tighten regulations in order to allow only electric or hydrogen-fueled cars on Greater Paris roads by 2030. In central Paris, pre-2000 diesels have been banned since July 2017.

Also Read: Paris Adopts Climate Action Plan, Aims At Achieving a ‘Zero Carbon’ Future

Fifteen French metropolitan areas including Lyon, Nice, Aix-Marseille and Toulouse last month agreed to install or reinforce low-emission zones by 2020. The French government hopes this will prevent European Union sanctions over non-respect of European air quality standards. (VOA)