WMO Report on the State of Global Climate - Part II

The other highlights of the 2016 Statement by WMO were the following:

Global Temperatures:

·      2016’s warmth extended almost worldwide. Temperatures were above the 1961-90 average over the vast majority of the world’s land areas, the only significant exceptions being an area of South America centred on central Argentina, and parts of south-western Australia.

·      Mean annual temperatures at least 3 °C above the 1961-1990 average occurred in various high-latitude locations, particularly along the Russian coast and in Alaska and far north-western Canada. In the high Arctic, Svalbard (Norway) Airport’s 2016 mean annual temperature of −0.1 °C was 6.5 °C above the 1961-1990 average, and 1.6 °C above the previous record.

·      Outside the Arctic, 2016’s warmth was more notable for its consistency across the globe than for its extreme nature in individual locations.

Ocean:

·      Globally averaged sea surface temperatures in 2016 were the warmest on record.

·      Global ocean heat content was the second-highest on record after 2015. It reached new record highs in the northern hemisphere, but was cooler in the southern hemisphere.

·      Globally, sea level has risen by 20 cm since the start of the twentieth century, mostly due to thermal expansion of the oceans and melting of glaciers and ice caps. Global sea levels rose very strongly during the 2015/2016 El Niño, rising about 15 millimetres between November 2014 to a new record high in February 2016. This was well above the post-1993 trend of 3 to 3.5 mm per year.

Arctic sea ice:

·      The seasonal maximum, of 14.52 million sq km on 24 March, was the lowest in the 1979-2016 satellite record. The 2016 autumn freeze-up was exceptionally slow – with sea ice extent even contracting for a few days in mid-November.

Precipitation:

·      Much of southern Africa began the year in severe drought. For the second year in succession, rainfall was 20 to 60% below average for the summer rainy season in 2015/2016. The World Food Programme estimated that 18.2 million people would require emergency assistance by early 2017.

·      Provisional figures showed 2016 was the driest on record over the Amazon Basin, and there was also significant drought in north-east Brazil.  El Niño brought drought conditions elsewhere in Central America and northern South America.

·      The Yangtze basin in China experienced, overall, its most significant flood season since 1999. Averaged over China as a whole, it was the wettest year on record, with national mean rainfall of 730 mm being 16% above the long-term average.

Heatwaves:

·      The year started with an extreme heatwave in southern Africa in the first week of January. On 7 January, it reached 42.7 °C at Pretoria and 38.9 °C at Johannesburg, both of which were 3 °C or more above the all-time records at those sites.

·      Extreme heat also affected South and South-East Asia in April and May, prior to the start of the summer monsoon. South-East Asia was badly affected in April. A national record of 44.6 °C was set at Mae Hong Son, Thailand, on 28 April, and 51.0 °C was observed on 19 May at Phalodi, the highest temperature on record for India.

·      Record or near-record temperatures occurred in parts of the Middle East and north Africa. The highest temperature observed was 54.0 °C at Mitribah (Kuwait) on 21 July which  will be the highest temperature on record for Asia. Significant high temperatures were also reported in Morocco, Tunisia, Libya, and the United Arab Emirates.

·      A late-season heatwave affected many parts of western and central Europe in the first half of September. In southern Spain, 45.4 °C was recorded at Cordoba on 6 September.