Climate History of Marrakech (Morocco)
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- Опубликовано: 23 фев 2024
- If you followed a little bit the news about past or modern climate change, you probably saw several times something like "temperature will rise by 4°C", or "temperatures were 10°C colder during Stone Age", etc.
This kind of information does not permit to figure out what kind of environment was going on.
This simulation has been performed on 16 cities around the world, I aim to locate over the 21,000 years the best modern climate analogue for each of them. Enjoy !
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Being so close to the Atlas mountains, Marrakech can get spontaneous late afternoon summer downpours due to the scorching hot air pushing cooler mountain air to the surface. Despite these heavy rains, the region lacks vegetation, it's as if the water immediately washes into the nearest river and out to sea and doesn't seep into the ground.
When Marrakech is Csa, one good analogue is to Sacramento, California. BSh on the brink of Csa? San Jose, California.
California of course has huge variation in climate over comparatively short distances. I have noticed this in vegetation, with San Gorgonio Pass on I-10 between San Bernardino and Palm Springs having an abrupt divide between hot desert and Mediterranean vegetation in as little as a mile.
Excellent warning about global warming. I'm thinking of Baja California, a place with many from southern California would be familiar, as an analogy. Morocco is one of the countries most vulnerable to warming and dessication. Seeing Marrakech having the prospect of becoming like extreme hot deserts is a clear warning to places like Greater Ell Ay and southern and western Australia..
Another warning? Shame so many warnings over the decades about things that were going to happen have had their dates come and go w/o those things happening. But hey, I guess it's ok that the goal posts just keep getting moved back, and back, and back....
CC is big business, and there typically is a huge amount of BS in big business as it procures money from the general populace in many, many disingenuous ways.
El Ay? I know what you mean, but that's the provisional name I've given for a location in a worldbuilding project of mine (an extremely hot habitable planet) designed to be the only sea level location on the planet outside the polar regions that regularly receives snow and has sub-lethal summers.
Specifically, it has this climatic pattern.
Winter: Crisp, somewhat dry, and relatively short, like Nebraska.
Spring: Rapidly increasing temperatures, dry.
Grishma: Brutal modern Death Valley-like bone dry heat.
Monsoon: Staggering near-Wet-Bulb-Event humid heat (Red Sea/Persian Gulf heat wave-style) coupled with Meghalaya-like torrential rainfall.
Autumn: Mild with moderate rain, occassional exceptional rainfall from ex-hypercanes.
Well I had posted a comment/response here, but it seems to not show up. It was critical of CC....so maybe that's why?
@@piptyson5512 Climate change is real. Such population crashes as happened during the Mongol wars, the Blak Death, and the mass death of indigenous populations of the New World after 1492 all contributed to theLittle Ice Age. Things got cold enough that London had Ice Fairs. Only when populations againrose to late-medieval levels (and consumption of fossil fuels and the burning of wood fires) did climates become much like those in classical times. Just look at the climate history of Berlin.
The energy use of our time is an even greater departure from the difference between about 1200 and 1600. If the car culture has likely peaked in the First World, it is taking off elsewhere. That's enough to push Berlin from Cfb (like western Europe from Bordeaux to Copenhagen) to Cfa (like the the Po Valley, Milan to Venice)
Berlin has been Cfb (oceanic), Dfb (continental long summer), and Cfb again since about 1850.
@@piptyson5512 What is CC?
Good video. What would the best city for southern France's climate ?
He already has Brest, France. I would suggest cities in Mediterranean climates of Australia (Perth, Adelaide, or Melbourne), Chile (Valparaiso or Santiago), South Africa (Capetown), Lebanon (Beirut), Turkey (Istanbul), or California (Sacramento, Santa Barbara --San Francisco is too much like Brest). Los Angeles, San Jose, and San Diego would be more analogous to Athens.
I have seen indicatins that he is going for a city in western or southern Australia, so that could be the best analogue.
Marseille
Anything for the Japanese islands? They looked interesting on a LGM vegetation map
It looks as if the "Green Sahara" time less involved the northern edge of the Sahara and its practical extension into the Arabian peninsula (Marrakesh is almost Saharan now)., Sfax, Alexandria, Beersheba, Basra) than the Sahel. Marrakesh had a short sta in the humid zone, and then it was marginal -- like Athens (Greece) or San Jose (California) today. .
A good thermal analogue to Marrakesh would probably be either Austin or San Antonio, Texas.
An amazing video actually. I love those types of videos where you show cities and how their climates changed and will change.
Are you by any chance going to make one where a Ukrainian city would be shown?
I am Ukrainian so that would be very interesting to me
Anyways good job
Can you make one about Timbuctu?.
There is Ndjamena which is basically the same pattern
That the "Best Modern Analogue" occasionally comes out as Lesotho, with places like regions in Yúnnán yielding a close match, shows that your algorithm is imperfect as while it does take into account precipitation seasonality, it doesn't care _when_ the wet and dry seasons are-Marrakech appears to have always had a wet-winter, dry-summer pattern in the Late Pleistocene and Holocene, while Lesotho and Yúnnán have dry winters and wet summers. I mean, if they had the same precipitation pattern as Marrakech, they'd probably possess many more ski resorts.
Sadly, while I can help you with a better thermal similarity algorithm,† I can't with precipitation, the problem being that its far larger spacial and temporal variability than temperature makes it very hard to make a "temporally-aware" precipitation similarity algorithm with good results.
†But I rather hesitate to, as I'd like to be the first to implement it-it is within my capabilities to do so if you ignore a crucial aspect of it... can you assist me on that aspect? I'd be fine with you using it if you provide me the files for that step before you do the other processing and credit me for the formula.
I'm also thining of such places as Bakersfield and Tucson.
I know this channel has made a video about N'Djamena's climate history. I do wonder what a settlement deep in the Sahara would look like, eg. Sabha, Libya. Did green Sahara go that north?
watch my green sahara video