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akash
08-30-2020, 11:06 PM
Bay area/San Francisco is relativly a dry area, I think it only gets 20 inches of rain. My question is how come there is huge Redwood forest near San Francisco then? and why San Fran in general is green?

Varun R
08-30-2020, 11:29 PM
The redwoods are supported by the marine fog.

akash
08-30-2020, 11:49 PM
The redwoods are supported by the marine fog.

are you sure, how?

Varun R
08-31-2020, 03:40 AM
https://www.scientificamerican.com/article/fog-that-nourishes-california-redwoods-declining/

digital_noise
08-31-2020, 04:23 AM
Its incredibly foggy here in the Bay Area, more so in actual San Francisco and Marin Co. The ocean is right there and inland it gets very warm so that creates a perfect storm for fog, but in general its foggy until about 12:00-13:00 and then it burns off

akash
09-02-2020, 06:30 PM
Its incredibly foggy here in the Bay Area, more so in actual San Francisco and Marin Co. The ocean is right there and inland it gets very warm so that creates a perfect storm for fog, but in general its foggy until about 12:00-13:00 and then it burns off

so moisture from fog actually gives life to these huge trees? is the same true for Redwoods in North West California? that area gets much more rain.

digital_noise
09-02-2020, 07:33 PM
so moisture from fog actually gives life to these huge trees? is the same true for Redwoods in North West California? that area gets much more rain.

Yes. I cannot say how it works exactly but I can say that at times the fog is so thick up there that it seems like it’s raining. It’s very moist despite the overall area being relatively dry

Revmac
09-03-2020, 02:22 AM
Yes it’s it’s true even in the west.

Like Mark Twain said; “The coldest winter I ever spent was a summer in San Francisco.”

The topography of CA is really the reason. South of SF and inland of SF the temperature gets quite high because of the Central Valley and then the valleys east of the Sierra Nevada. It acts as a heat-sink drawing warmer air from all around and making most costal areas cooler as a result. Also, the Sierra Nevada range is the tallest in the contiguous US—and it is right next to the largest ocean on the planet. So that draws moisture (to coastal areas) and really makes the inland more dry than the coast.

I actually used to work at a Redwood tree nursery.

Also, the Redwoods themselves are full of symbiotic relationships. They coexist with ferns, moss, fungi, etc.. All of these organisms absorb tons of moisture from the naturally occurring fog and benefit the trees.

ben_john7
09-21-2020, 08:00 AM
Here is what I read about your question:

Thick fogs are a daily occurrence on the coast, where the California sequoia lives, and we can say that it not only grows in such conditions, but literally needs these fogs. These hundred meter giants get moisture from there for their needles on the top, where the system of vessels can no longer pump it. The average temperature of 10-15C, which prevails in this area, is also important for the life cycle of the sequoi. These two conditions - temperature and humidity - are the limiters that define the modern range of these amazing giants.

jetshop
09-24-2020, 08:21 AM
Tangentially related, but the pygmy forests up in Northern California might interest you too. These areas have very nutrient-poor, acidic soil with bad drainage, so pine trees that normally reach 80 ft tall when they're 100 are stunted and only 8 ft tall at a century old. If you didn't know what the area was it would just look like a patch of forest with young trees (https://hejdoll.com/wp-content/uploads/2018/05/hej-doll-mendocino-mama-trip-pygmy-forest-1.jpg), but they're actually much older than they look and just unable to grow very quickly due to their soil environment.

If you ever make it out here I recommend checking out the redwood forests (and the Van Damme pygmy forest) for sure.