New Zealand National Climate Summary 2010: Settled and Warm Annual Mean Sea Level Pressures Were Above Average Over the New Zealand Region in 2010
NIWA MEDIA RELEASE: 12 JANUARY 2011 New Zealand national climate summary 2010: Settled and warm Annual mean sea level pressures were above average over the New Zealand region in 2010. The increased prevalence of anticyclones (‘highs’) near New Zealand produced a relatively settled climate for the year overall, with average or above average annual temperatures in all regions, normal or above normal sunshine hours in most districts, and drought at either end of the year. The large-scale climate setting changed from a moderate El Niño at the start of the year, to a La Niña by July. The La Niña climate pattern intensified to moderate-to-strong by September, and prevailed through the end of 2010. The Southern Annular Mode (SAM), a climate pattern affecting the westerly wind strength and location over and to the south of the country, was strongly positive overall in 2010. This contributed to the prevalence of anticyclones experienced near New Zealand. Mean annual temperatures were above average (between 0.5°C and 1.2°C above the long-term average) in the northeast of the North Island, and in Nelson, Marlborough, parts of Canterbury, Fiordland and parts of Westland, the southern Lakes District and central Otago. Mean annual temperatures were near average elsewhere (within 0.5°C of the long-term average). The national average temperature for 2010 based on a 7-station series was 13.1 °C, 0.5 °C above the 1971–2000 annual average. 2010 was the 5th warmest year since 1900, based on this 7-station series. The four warmer years were 1971 (+0.6 °C), 1998 (+0.9 °C), 1999 (+0.8 °C), and 2005 (+0.6 °C).
[Show full text]