Video | Business Headlines | Internet | Science | Scientific Ethics | Technology | Search

 

NIWA’s Sea Surface Temperature Update

Wednesday, 30 January 2019


A fortnightly report, updated over summer, covering sea surface temperatures and anomalies (differences from average) around New Zealand.

Following the Tasman Sea marine heatwave event of 2017-18, this report will help users understand the latest conditions in the ocean and their expected changes over the upcoming weeks.


Over the past two weeks, sea surface temperatures (SSTs) have remained the same or increased slightly in the New Zealand region. As a whole, Tasman Sea surface temperatures are +1.3C above average for the time of year, although localized anomalies of +2.0 to +3.0C exist in the central and west. New Zealand coastal waters are generally 0.5C to 1.5C above average, a decline from two weeks ago.

Marine heatwave conditions are likely still occurring in parts of the central and western Tasman Sea and in coastal waters east of the North Island, according to the definition proposed by Australian research in 2016 (see background below).

Compared to the same 2-week period in 2018, New Zealand coastal waters are 1.0 to 3.0C cooler, although the western Tasman Sea is 1.0 to 3.0C warmer.


Expected Conditions over the Next Several Weeks

A hot airmass over New Zealand has led to SST warming of 1.0 to 2.0C over the last several days. A southerly change is forecast to occur from Friday into Saturday, ending the spell of unusual warmth. Heading through the first half of February, weather patterns are forecast to have more variability than what was observed during January and while sea surface temperatures are expected to remain above average for the time of year, marine heatwave conditions are unlikely to develop in new areas.

Background:

Sea Surface Temperature Update is a fortnightly report for New Zealand media. It provides measurements of sea surface temperature and anomalies (differences from average) measurements for New Zealand coastal and Tasman Sea waters.

Sea surface temperature anomaly: the difference between the long-term (1981-2010) average sea surface temperature and current sea surface temperature for a given time of year.

New Zealand region: within this document, any quoted anomalies refer to spatial averages over the ocean region bounded by the coordinates (145°E-175°W, 25-55°S)

SST: abbreviation for sea surface temperature.

Marine heatwave: periods of extremely warm sea surface temperature that persists for a prolonged period of time and can extend up to thousands of kilometres. According to Australian research (Hobday et al. 2016), warm sea surface temperature events are considered marine heatwaves (MHWs) if they last for five or more days with temperatures warmer than the 90th percentile based on a 30-year historical baseline period.


ends

© Scoop Media

 
 
 
Business Headlines | Sci-Tech Headlines

 

Industry Report: Growing Interactive Sector Wants Screen Grants

Introducing a coordinated plan that invests in emerging talent and allows interactive media to access existing screen industry programmes would create hundreds of hi-tech and creative industry jobs. More>>

ALSO:

Ground Rules: Government Moves To Protect Best Growing Land

“Continuing to grow food in the volumes and quality we have come to expect depends on the availability of land and the quality of the soil. Once productive land is built on, we can’t use it for food production, which is why we need to act now.” More>>

ALSO:

Royal Society: Calls For Overhaul Of Gene-Technology Regulations

An expert panel considering the implications of new technologies that allow much more controlled and precise ‘editing’ of genes, has concluded it’s time for an overhaul of the regulations and that there’s an urgent need for wide discussion and debate about gene editing... More>>

ALSO:

Retail: Card Spending Dips In July

Seasonally-adjusted electronic card spending dipped in July by 0.1 percent after being flat in June, according to Stats NZ. Economists had expected a 0.5 percent lift, according to the median in a Bloomberg poll. More>>

ALSO:

Product Stewardship: Govt Takes More Action To Reduce Waste

The Government is proposing a new way to deal with environmentally harmful products before they become waste, including plastic packing and bottles, as part of a wider plan to reduce the amount of rubbish ending up in landfills. More>>

ALSO:

Earnings Update: Fonterra Sees Up To $675m Loss On Writedowns

“While the Co-op’s FY19 underlying earnings range is within the current guidance of 10-15 cents per share, when you take into consideration these likely write-downs, we expect to make a reported loss of $590-675 million this year, which is a 37 to 42 cent loss per share." More>>

ALSO: