Newfie wrote:This is not my field but let me try. Others here will gently correct me if I am wrong.
The historic plains were riddled with lakes and bogs, places where water collected if even seasonally. Those ponds were drained and turned into “productive” farm land.
Returning the plains to their pre-Columbian state is likely not possible but simply letting more and larger patches be would work to allow those sustainable habitats to reoccur.
NIWA's projections are based on four scenarios, known as representative concentration pathways, published by the Intergovernmental Panel on Climate Change. The pathways range from a best-case scenario of decreasing carbon dioxide concentrations in the atmosphere by 2100, through to a scenario where the levels continue to increase throughout this century.
RNZ has used NIWA's data to visualise two extremes – the number of ‘rain days’ each season, when at least 1mm of rain falls; and ‘hot days’, when the maximum temperature gets over 25 degrees Celsius.
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Right now in areas like Auckland or Whangārei, there are about 30 days every summer where the mercury shoots up to 25 degrees Celsius or more – roughly one in every three days.
That’s already hotter than it was 50 years ago, when the two cities experienced maybe a dozen ‘hot days’ each summer – balmy beach days interspersed with comfortably warm periods.
By the middle of this century – not all that far away – the number of hot days could nearly double, to 50 a summer.
By 2100, within the lifetime of children being born now, nearly every summer day will be a ‘hot day’ in Auckland and Whangārei. The cool days of respite will be over.
Spring rainfall in both places is projected to diminish – meaning it will already be drier when summer begins.
In Northland, even winter rain days are projected to decrease, meaning droughts could become severe, Sood says.
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dohboi wrote:Beyond [a] reasonable drought: New Zealand's climate future
Memories of unprecedented water-use restrictions in cities and towns, dry country wells and shriveled croplands linger from California’s punishing 2012-16 drought.
Officials say the lessons of those withering years have left the state in a somewhat better position to deal with its inevitable dry periods, and Gov. Gavin Newsom is not expected to declare a statewide drought emergency this year.
“We don’t see ourselves in that position in terms of supply,” said Department of Water Resources Director Karla Nemeth. “If it’s dry next year, then maybe it’s a different story.”
Southern California is a case in point.
Let's use the dividing line of the Monterey-San Luis Obispo county border. That leaves 48 counties and about 15.7 million people in Northern California and 10 counties with 23.8 million people in Southern California — both still larger than any state but Texas, Florida and New York.
jedrider wrote:California is revising it's forest management, but something that took decades to create probably needs a decade to resolve to some stalemate of fires that doesn't blow out huge areas all at once. I'm going to try to get my camping in early this year because July/August/September seem like no goes now whereas before it was the height of the camping season. The climate has certainly turned a corner already in California. How do they call that? A tipping point. (I should add that June/October/November is still a time of danger, but at least it may be possible to avoid the smoke if lucky.)
Plantagenet wrote:2021 is going to be the worst year yet for drought across the western USA
[/quote]The 2020-2021 “rainy season” to date has, in fact, turned out to be exceptionally dry across portions of California. I think this probably slipped in under the radar, given everything else that has transpired in the world over the past few months, but some parts of northern California (including the SF North Bay, Mendocino County, and much of the central/northern Sacramento Valley) are currently experiencing their driest season since the 1976-1977 drought (and a few places are running behind even that infamous season). This is doubly concerning as these same regions experienced a top-5 driest winter on record just last year–so this is now year two of exceptionally low precipitation in these areas. All of this is amplified by the prolonged periods of record high temperatures and drying offshore winds last year–both of which reduced water availability beyond what would be expected from precipitation deficits alone.
In the past 20 years, the two worst stretches of drought came in 2003 and 2013 — but what is happening right now appears to be the beginning stages of something even more severe. And as we head into the summer dry season, the stage is set for an escalation of extreme dry conditions, with widespread water restrictions expected and yet another dangerous fire season ahead.
The above image is a time series of drought in the western states from 2000 to 2021. This latest 2020-2021 spike (on the right) is every bit as impressive as the others, but with one notable difference — this time around, the area of "exceptional drought" is far larger than any other spike, with an aerial coverage of over 20%. As we enter the dry season, there is very little chance conditions will get better — in fact it will likely only get drier.
With this in mind, there is little doubt that the drought in the West, especially the Southwest, this summer and fall will be the most intense in recent memory. The only real question: Will it last as long as the last extended period of drought from 2012 to 2017? Only time will tell.
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