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There are 3,820 lakes in New Zealand with a surface area larger than 1 hectare (2.5 acres), [3] and are of varying types and origins. Many of the lakes in the central North Island area are volcanic crater lakes, while the majority of the lakes near the Southern Alps were carved by glaciers.
The current forecast for global sea level rise is for 0.5 m by 2100, but in some parts of New Zealand, the effective rise in sea level could be twice as great by that time, because of the combined effect of gradual land subsidence. [7] Many different parts of the country are affected by the change in forecast sea level rise.
In situ measurements are mostly done at ground-level; however balloons are launched weekly and carry out in situ measurements through the atmosphere to altitudes of approximately 30 km. [23] Data from these balloons enables atmospheric profiles of temperature, pressure, water vapour, and ozone to be produced. [24]
The South Island is a bit cooler, with maximum temperatures around 7–12 °C (45–54 °F), though sometimes lower. The lowest temperature ever recorded was −25.6 °C (−14.1 °F) at Ranfurly in Otago in 1903, with a more recent temperature of −21.6 °C (−6.9 °F) recorded in 1995 in nearby Ophir. [7]
The ocean temperature plays a crucial role in the global climate system, ocean currents and for marine habitats. It varies depending on depth, geographical location and season. Not only does the temperature differ in seawater, so does the salinity. Warm surface water is generally saltier than the cooler deep or polar waters. [1]
The five reservoirs continue to operate today, supplying water. [30] Combined, the reservoirs supply approximately 26% of Auckland's potable water demand. The ranges receive an average of over 2,000 mm (78.75 inches) of rainfall annually while the corresponding rate in the city is less than half that. [31]
Average sea temperature around Auckland varies throughout the year. The water temperature is warmest in February when it averages 21 °C (70 °F), while in August, the water temperature is at its coolest, averaging 14 °C (57 °F). [54] Prevailing winds in Auckland are predominantly from the southwest.
Following lighter rain on 30 and 31 January, areas of Auckland flooded for a second time on the morning of 1 February after more heavy downpours. [10] MetService reported that about 20–30 millimetres per hour (0.79–1.18 inches per hour) of "intensive rainfall" had fallen in parts of Auckland in the early hours of 1 February. [29]
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