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Have you looked at the North Pole lately?
- Thread starter igrowone
- Start date
you said hot air holds more moisture. i'm waiting...it CAN, i agree. specificity, please. cold air can hold a shitpot too, right up until it snows...i'm saying humidity affects the dryness of the fuel available, which DOES affect the severity of wildfires. yes or no. if there WAS any wood in Death Valley, do you think it would be difficult to start a fire with it? unless you tried right after one of their freak rains?
St. Phatty
Active member
https://wildfiretoday.com/2020/07/3...-collision-while-battling-wildfire-in-nevada/
"Two pilots killed in mid-air collision while battling wildfire in Nevada"
not a good way to start the fire season.
must be demoralizing for the firefighters.
i wonder how many of them use meth.
i know in professions where people have a lot of 16 hour days, meth use becomes almost a normal thing.
"Two pilots killed in mid-air collision while battling wildfire in Nevada"
not a good way to start the fire season.
must be demoralizing for the firefighters.
i wonder how many of them use meth.
i know in professions where people have a lot of 16 hour days, meth use becomes almost a normal thing.
TychoMonolyth
Boreal Curing
Are dexies passé?
not in my estimation...
Alaskan Seismometers Record the Northern Lights
Published on 29 July 2020 | Journals, News, SRL
29 July 2020–Aaron Lojewski, who leads aurora sightseeing tours in Alaska, was lucky enough to photograph a “eruption” of brilliant pink light in the night skies one night in February.
The same perturbations of the Earth’s magnetic field that lit up the sky for Lojewski’s camera were also captured by seismometers on the ground, a team of researchers reports in the journal Seismological Research Letters.
Aurora near Poker Flat, Alaska. | Aaron Lojewski, Fairbanks Aurora Tours
By comparing data collected by all-sky cameras, magnetometers, and seismometers during three aurora events in 2019, seismologist Carl Tape of the Geophysical Institute at the University of Alaska Fairbanks and colleagues show that it’s possible to match the striking display of lights with seismic signals, to observe the same phenomenon in different ways.
Researchers have known for a while that seismometers are sensitive to magnetic fluctuations—and have worked hard to find ways to shield their instruments against magnetic influence or to remove these unwanted signals from their seismic data. But the aurora study offers an example of how seismometers could be paired with other instruments to study these fluctuations.
“It can be hard to be definitive that these seismometer recordings are originating from the same influence as what’s going on 120 kilometers up in the sky,” Tape said. “It helps to have a simultaneous view of the sky, to given you more confidence about what you’re seeing from the signals at ground level.”
The aurora borealis, or northern lights, occurs when solar winds—plasma ejected from the Sun’s surface—meet the protective magnetic field that surrounds the Earth. The collision of particles produces colorful lights in the sky and creates fluctuations in the magnetic field that are sometimes called solar or space “storms.” Magnetometers deployed on the Earth’s surface are the primary instrument used to detect these fluctuations, which can significantly impact electrical grids, GPS systems and other crucial infrastructure. The aurora is commonly visible in wintertime in high-latitude regions such as Alaska.
The seismometers in the study are part of the USArray Transportable Array, a network of temporary seismometers placed across North America as part of the EarthScope project. The array in Alaska and western Canada was completed in the fall of 2017. The aurora paper is one of several included in an upcoming SRL focus section about EarthScope in Alaska and Canada.
These temporary seismic stations are not shielded from magnetic fields, unlike more permanent stations that are often cloaked in mu-metal, a nickel-iron alloy that directs magnetic fields around the instrument’s sensors. As a result, “I was blown away by how well you can record magnetic storms across the array,” said U.S. Geological Survey seismologist Adam Ringler, a co-author on the SRL paper.
Last month, Ringler and his colleagues published a paper demonstrating how the array’s 200-plus seismometers in Alaska can be used to record space weather, potentially augmenting the 13 magnetometers in operation in the state.
Along with the all-sky camera data, seismic array data can help make sense of the strong variations in the magnetic field that occur in a magnetic east-west direction, adding a second dimension to typical north-south directional studies of the aurora and other magnetic storms, Tape and colleagues suggest.
The researchers noted in their paper that the link between the aurora borealis and magnetic perturbations was first discovered in Sweden in 1741, and that a seismometer in Germany detected an atmosphere-generated magnetic event for the first time during a strong solar storm in 1994.
“People have been making these connections for 250 years,” Tape said. “This shows that we can still make discoveries, in this case with seismometers, to understand the aurora.”
https://www.seismosoc.org/news/alaskan-seismometers-record-the-northern-lights/
Published on 29 July 2020 | Journals, News, SRL
29 July 2020–Aaron Lojewski, who leads aurora sightseeing tours in Alaska, was lucky enough to photograph a “eruption” of brilliant pink light in the night skies one night in February.
The same perturbations of the Earth’s magnetic field that lit up the sky for Lojewski’s camera were also captured by seismometers on the ground, a team of researchers reports in the journal Seismological Research Letters.
Aurora near Poker Flat, Alaska. | Aaron Lojewski, Fairbanks Aurora Tours
By comparing data collected by all-sky cameras, magnetometers, and seismometers during three aurora events in 2019, seismologist Carl Tape of the Geophysical Institute at the University of Alaska Fairbanks and colleagues show that it’s possible to match the striking display of lights with seismic signals, to observe the same phenomenon in different ways.
Researchers have known for a while that seismometers are sensitive to magnetic fluctuations—and have worked hard to find ways to shield their instruments against magnetic influence or to remove these unwanted signals from their seismic data. But the aurora study offers an example of how seismometers could be paired with other instruments to study these fluctuations.
“It can be hard to be definitive that these seismometer recordings are originating from the same influence as what’s going on 120 kilometers up in the sky,” Tape said. “It helps to have a simultaneous view of the sky, to given you more confidence about what you’re seeing from the signals at ground level.”
The aurora borealis, or northern lights, occurs when solar winds—plasma ejected from the Sun’s surface—meet the protective magnetic field that surrounds the Earth. The collision of particles produces colorful lights in the sky and creates fluctuations in the magnetic field that are sometimes called solar or space “storms.” Magnetometers deployed on the Earth’s surface are the primary instrument used to detect these fluctuations, which can significantly impact electrical grids, GPS systems and other crucial infrastructure. The aurora is commonly visible in wintertime in high-latitude regions such as Alaska.
The seismometers in the study are part of the USArray Transportable Array, a network of temporary seismometers placed across North America as part of the EarthScope project. The array in Alaska and western Canada was completed in the fall of 2017. The aurora paper is one of several included in an upcoming SRL focus section about EarthScope in Alaska and Canada.
These temporary seismic stations are not shielded from magnetic fields, unlike more permanent stations that are often cloaked in mu-metal, a nickel-iron alloy that directs magnetic fields around the instrument’s sensors. As a result, “I was blown away by how well you can record magnetic storms across the array,” said U.S. Geological Survey seismologist Adam Ringler, a co-author on the SRL paper.
Last month, Ringler and his colleagues published a paper demonstrating how the array’s 200-plus seismometers in Alaska can be used to record space weather, potentially augmenting the 13 magnetometers in operation in the state.
Along with the all-sky camera data, seismic array data can help make sense of the strong variations in the magnetic field that occur in a magnetic east-west direction, adding a second dimension to typical north-south directional studies of the aurora and other magnetic storms, Tape and colleagues suggest.
The researchers noted in their paper that the link between the aurora borealis and magnetic perturbations was first discovered in Sweden in 1741, and that a seismometer in Germany detected an atmosphere-generated magnetic event for the first time during a strong solar storm in 1994.
“People have been making these connections for 250 years,” Tape said. “This shows that we can still make discoveries, in this case with seismometers, to understand the aurora.”
https://www.seismosoc.org/news/alaskan-seismometers-record-the-northern-lights/
Cold Air Is Dry Air
Posted by Allison Bailes on December 9, 2013
Relative humidity is what everyone likes to talk about. It gets the attention, but it can be a bit confusing, especially when the temperatures drop. For example, at one point yesterday, we had a relative humidity (RH) of 97%. Seems humid, eh?
It's not really. Not in terms of how much water vapor is actually in the air, that is. The psychrometric chart below shows how this works.
The two points I've highlighted on the chart are:
- Point A: 32° F, 100% RH
- Point B: 70° F, 20% RH
The psychrometric chart rocks!
On the psychrometric chart, an unchanging number of water molecules means the movement is purely horizontal. The temperature changes but the absolute humidity does not. But as that mass of air warms up, the relative humidity does change. In simple terms, warmer air can hold more moisture, so rather than being saturated, as it was outdoors at 100% RH, that same air can hold a lot more moisture when it moves inside and warms up.
The three main variables on the psychrometric chart are:
- Temperature - Dry bulb, what we normally mean when we say the word; it's shown along the horizontal axis.
- Absolute Humidity - How much actual water vapor is in the air; measured in grains per pound of dry air, where 1 grain = 1/7000 of a pound (or 7000 grains = 1 pound).
- Relative Humidity - What we usually mean we say the word 'humidity.' It's actually the partial pressure of water vapor in the air divided by the vapor pressure when the air is saturated at that temperature.
On a nice spring day when the temperature has risen to 70° F and the RH is 50%, the absolute humidity is about 50 grains/lb. Can you find that on the chart above? Can you find what the dew point is for that condition? (Answer below)
One of the worst kind of days we have here in the Atlanta area is when it's about 80° F an 80% RH. Ugghhhhh. The absolutely humidity is about 122 grains/lb, and the dew point is 73° F. And that's not even the worst I've experienced in the Southeast. Atlanta has nice, fairly mild summers compared to where I was born: Houston, Texas.
Back to the main point, though, if we think of air by its absolute humidity, it's easy to see that cold air is dry air. 100% RH at the freezing point has only 22 grains per pound. 80% RH at 80° F has 122 grains per pound. If you had 80° F air with only 22 grains/lb, the relative humidity would be less than 15%. You'd be in a desert.
specific enough?
Even with very high Relative Humidity cold air has very little absolute vapor. That is pretty straightforward.
As a gardener starting in the late 1990's I tracked inside, veg, clone, and bud room RH with remote sensor sets. I also had three levels of temperature sensors in the room, another sensor outside and one on the trunk at the halfway point, kinda anal retentive that way.
Anyhow, along with absolute vapor levels the outside Relative Humidity ran from zero to five percent for almost the entire winter. Running a frost free positive pressure house kept the inside RH under twenty percent.
I grew Sativa's almost exclusively.
I also dispatched aircraft. At -35 on long flights with questionable visibility at the destination and home airport, the fuel load would be pushed up until the aircraft weight was 15% over maximum gross. This would allow the aircraft a few extra hours looking for holes in the ice fog. Just a peek to line up on the runway was enough, but often waiting time was extensive at both ends.
The heavy dry air of winter safely allowed loads unthinkable in warmer climates.
As a gardener starting in the late 1990's I tracked inside, veg, clone, and bud room RH with remote sensor sets. I also had three levels of temperature sensors in the room, another sensor outside and one on the trunk at the halfway point, kinda anal retentive that way.
Anyhow, along with absolute vapor levels the outside Relative Humidity ran from zero to five percent for almost the entire winter. Running a frost free positive pressure house kept the inside RH under twenty percent.
I grew Sativa's almost exclusively.
I also dispatched aircraft. At -35 on long flights with questionable visibility at the destination and home airport, the fuel load would be pushed up until the aircraft weight was 15% over maximum gross. This would allow the aircraft a few extra hours looking for holes in the ice fog. Just a peek to line up on the runway was enough, but often waiting time was extensive at both ends.
The heavy dry air of winter safely allowed loads unthinkable in warmer climates.
Canada's last intact Arctic ice shelf has collapsed
Canada's last intact Arctic ice shelf has collapsed
Canada's last intact ice shelf has collapsed, researchers announced Thursday.
A huge section of the Milne Ice Shelf, located on Ellesmere Island in the northern Canadian territory of Nunavut, collapsed into the Arctic Ocean, according to the Canadian Ice Service. This created an "ice island" that's about 30 square miles in size.
As a comparison, Manhattan Island is about 23 square miles.
“Entire cities are that size. These are big pieces of ice,” Luke Copland, a glaciologist at the University of Ottawa who was part of the research team studying the ice shelf, told Reuters. “This was the largest remaining intact ice shelf, and it’s disintegrated, basically.”
The ice service said on Twitter that “above-normal air temperatures, offshore winds and open water in front of the ice shelf are all part of the recipe for ice shelf break up.”
The ice shelf has now been reduced in area by about 43%.
An ice shelf is a thick slab of ice, attached to a coastline and extending out over the ocean, according to the National Snow and Ice Data Center. "Some shelves persist for thousands of years," the center said.
So what's going on up there? Though the planet is warming worldwide due to climate change, the Arctic has been warming at a rate twice that of the rest of the world, according to the National Oceanic and Atmospheric Administration. This summer has been particularly warm: Arctic sea ice melted to its lowest July level on record and in June, a town in Siberia soared to 100.4 degrees, believed to be a record high for the Arctic.
Canada's last intact Arctic ice shelf has collapsed
Canada's last intact ice shelf has collapsed, researchers announced Thursday.
A huge section of the Milne Ice Shelf, located on Ellesmere Island in the northern Canadian territory of Nunavut, collapsed into the Arctic Ocean, according to the Canadian Ice Service. This created an "ice island" that's about 30 square miles in size.
As a comparison, Manhattan Island is about 23 square miles.
“Entire cities are that size. These are big pieces of ice,” Luke Copland, a glaciologist at the University of Ottawa who was part of the research team studying the ice shelf, told Reuters. “This was the largest remaining intact ice shelf, and it’s disintegrated, basically.”
The ice service said on Twitter that “above-normal air temperatures, offshore winds and open water in front of the ice shelf are all part of the recipe for ice shelf break up.”
The ice shelf has now been reduced in area by about 43%.
An ice shelf is a thick slab of ice, attached to a coastline and extending out over the ocean, according to the National Snow and Ice Data Center. "Some shelves persist for thousands of years," the center said.
So what's going on up there? Though the planet is warming worldwide due to climate change, the Arctic has been warming at a rate twice that of the rest of the world, according to the National Oceanic and Atmospheric Administration. This summer has been particularly warm: Arctic sea ice melted to its lowest July level on record and in June, a town in Siberia soared to 100.4 degrees, believed to be a record high for the Arctic.
Record low temps for South Australia. 
This seems to be off topic...
Who here has actually laid eyes upon the North pole?
Oh absolutely none of you??!! Really??
Ok so you are all taking someone else's word.
Do go on.
Who here has actually laid eyes upon the North pole?
Oh absolutely none of you??!! Really??
Ok so you are all taking someone else's word.
Do go on.
This seems to be off topic...
Who here has actually laid eyes upon the North pole?
Oh absolutely none of you??!! Really??
Ok so you are all taking someone else's word.
Do go on.
Plenty of comparative satellite images here....
https://climate.nasa.gov/
Would be pretty useless to go to the north pole unless you could spend 2 months on board a ship with a bunch of climate research scientists. I mean, c'mon!
White Beard
Active member
Record low temps for South Australia.
You’re lucky: it no longer gets cold in winter here, not much more than sweater weather these days. Enjoy it while you got it.
Could be that the point of no return is reached in Greenland.
https://news.osu.edu/warming-greenland-ice-sheet-passes-point-of-no-return/
https://news.osu.edu/warming-greenland-ice-sheet-passes-point-of-no-return/
Death Valley hits 130 degrees,
Death Valley hits 130 degrees,
thought to be highest temperature on Earth in nearly a century
Temperatures in Death Valley skyrocketed to a blistering 130 degrees on Sunday — possibly the highest mercury reading on Earth in almost 90 years.
The National Weather Service recording, which is awaiting confirmation, is among the top three highest temperatures ever measured in Death Valley, as well as the highest temperature seen there during the month of August, according to park and weather service data.
The temperature in Death Valley hit 130 degrees at 3:41 p.m. Sunday, the National Weather Service said in a tweet.
Death Valley holds the record for the highest temperature ever recorded on the planet: 134 degrees in 1913, according to Guinness World Records. That reading has been disputed, however.
In 1931, the mercury hit 131 degrees in Kebili, Tunisia, according to the World Meteorological Organization, but that reading also is disputed.
Since then, a 129-degree reading was recorded in Death Valley in 2013.
Death Valley hits 130 degrees,
thought to be highest temperature on Earth in nearly a century
Temperatures in Death Valley skyrocketed to a blistering 130 degrees on Sunday — possibly the highest mercury reading on Earth in almost 90 years.
The National Weather Service recording, which is awaiting confirmation, is among the top three highest temperatures ever measured in Death Valley, as well as the highest temperature seen there during the month of August, according to park and weather service data.
The temperature in Death Valley hit 130 degrees at 3:41 p.m. Sunday, the National Weather Service said in a tweet.
Death Valley holds the record for the highest temperature ever recorded on the planet: 134 degrees in 1913, according to Guinness World Records. That reading has been disputed, however.
In 1931, the mercury hit 131 degrees in Kebili, Tunisia, according to the World Meteorological Organization, but that reading also is disputed.
Since then, a 129-degree reading was recorded in Death Valley in 2013.
We need a nuclear winter
it's that time of year in the arctic
it seems both the north and western passages will open this year
the northern has been for nearly a month and west looking close
arctic cap ice was at record lows a month or so ago
the shrink slowed down for a while, but now is speeding back up
record low this year? looking possible, stay tuned on this channel
it seems both the north and western passages will open this year
the northern has been for nearly a month and west looking close
arctic cap ice was at record lows a month or so ago
the shrink slowed down for a while, but now is speeding back up
record low this year? looking possible, stay tuned on this channel
Attachments
St. Phatty
Active member
In July 2018, the fire that started in Redding and ended up at Lake Shasta was a DOOZY.
It was 108 degrees + that week. Some of the older fire-fighters commented about how -
A/ the fire scared them, more than usual
B/ there was a wind at the edge of the fire, blowing 10/20/30 miles per hour, 5 minutes in each of maybe 3 different compass directions. But 10 miles from the fire, there was no wind. The wind that seemed to be made to the fire, also made the fire spread harder.
Why did it happen then, and not other times when it was 105 degrees + ?
what are the weather & fire conditions that are essential to the fire behavior observed in Redding July 2018 ?
i'm sure the same thing could happen in Siberia or Oregon. I think one of the things the fire needs is energy, so the turbulence is more likely to happen when there is a lot of fuel.
That's my own SWAG.
When there's another fire like the Redding July 2018 fire, what will it have in common ?
It was 108 degrees + that week. Some of the older fire-fighters commented about how -
A/ the fire scared them, more than usual
B/ there was a wind at the edge of the fire, blowing 10/20/30 miles per hour, 5 minutes in each of maybe 3 different compass directions. But 10 miles from the fire, there was no wind. The wind that seemed to be made to the fire, also made the fire spread harder.
Why did it happen then, and not other times when it was 105 degrees + ?
what are the weather & fire conditions that are essential to the fire behavior observed in Redding July 2018 ?
i'm sure the same thing could happen in Siberia or Oregon. I think one of the things the fire needs is energy, so the turbulence is more likely to happen when there is a lot of fuel.
That's my own SWAG.
When there's another fire like the Redding July 2018 fire, what will it have in common ?
i'm sure some idiot is contemplating causing one...
Sunshineinabag
Active member
https://youtu.be/oMSf0_5Gcx8
Well met
Well met
