[time-nuts] CSAC Project(was CSAC purchase)
kb8tq at n1k.org
Thu Jan 25 15:59:17 EST 2018
Things have to get pretty deep to be fully isolated from the seasons down to
the “digits past the decimal” level. It *does* bring up an interesting place to set
up your temperature stabilized timing lab though. The commute back and forth
might be a bit of a chore :)
> On Jan 25, 2018, at 3:42 PM, jimlux <jimlux at earthlink.net> wrote:
> On 1/25/18 11:20 AM, Bob kb8tq wrote:
>> One of the unique features of underwater timing is that the sea bottom temperature
>> (once you get well away from a coastline) is *very* stable. In some deployments, the “random”
>> nature of ambient temperature that we fight all the time in the rest of the world, simply is not
>> present. The device sits at 2.345 C and that’s it …..
> It helps that water density has a maximum at a particular temperature - water that is warmer or colder tends to float up above it. I was just looking it up and found apparently that does vary with salinity, too... oh no, another miniscule factor to account for - is there a "seawater density nuts" list...
> Let's see, the bottom of Lake Tahoe (fresh water, so no salinity variation) is probably fairly stable at 4C. Or any other freshwater later that actually gets cold enough, and doesn't freeze to the bottom - so the deeper Great Lakes would probably work. How warm does the bottom of Lake Superior get in late summer?
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