Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
Areas that have seen the most warming are the high latitudes of the Arctic. Twice the rate elsewhere. Is that co2? Ocean cycles? The sun? Or a combination? It seems that the evidence is mounting that carbon dioxide plays a major role in regulating the earth's climate over long periods.
Richard Alley is excellent in explaining this. Watch
Areas that have seen the most warming are the high latitudes of the Arctic. Twice the rate elsewhere. Is that co2? Ocean cycles? The sun? Or a combination? It seems that the evidence is mounting that carbon dioxide plays a major role in regulating the earth's climate over long periods.
Richard Alley is excellent in explaining this. Watch
If it is true it's probably because the Ice Age is only now ending there. I personally suspect some of the data and earlier "cooler" temperatures. While a novel is no direct factual authority, novels about the Arctic such as Farley Mowat's Lost in the Barrens, written during the 1950's or early 1960's highlighted a warm spell in December that nearly ended tragically for the story's main characters. They were lured out of safe quarters to make a dash for the southland and of course winter's return overtook them.
That proves nothing directly except that the author was drawing from his own Arctic experiences.
This is Chicago's temperature trend according to Berkeley Earth. My question is how did they get data for the 1700's when no station or settlement existed?
They estimated it using stations over 1,000 km away. That's why there's significant uncertainty for that time period.
Quote:
Originally Posted by jbgusa
There are factors such as Urban Heat Island that could account for the minor amount of warming that has occurred. One degree Fahrenheit in a century, or about 0.4 C, is hardly an emergency and is likely within natural fluctuation range.
Not always.
Check out Barrow, AK.
Also, the globe has warmed 1 degree Fahrenheit in the past 40 years, not the past 100. While you could probably find some time in the past where that's happened, the biggest problem will be if the trend continues. We're likely not more than another degree F or two away from the warmest time in this interglacial. There's even the possibility that this is the warmest time in the present interglacial.
Sydney's winters have warmed up by a relatively great degree since the 1800s. Check out the difference in its winters between the 1880s and 2010s normals in this thread:
There is no doubth that the climate have become warmer, and there is scientific agreement that increased CO2 in the atmosphere is the main reason, and there is no dispute in the scientific community that it is getting warmer. There is some uncertainty about how much it is going to warm. There is agreement that the rate of warming is going to increase, so it will warm faster in the future than it has by now.
Nature is reacting to it. Mackerell is now common up in the Arctic, never seen before. The permafrost in the ground on Svalbard is getting warmer.
Glaciers are shrinking, especially on Greenland.
Heat records are happening all the time, while cold records have become rare.
Here is annual temperature at Utsira back to 1868, a lighthouse on island off the SW coast of Norway, so far from the Arctic. No UHI whatsoever here. Variability from year to year, but the trend is clearly upward:
And here is Vardø, a small town on a windblown island in the Barents Sea, far NE of Norway. UHI must be very weak here. Trend is clearly seen:
Credit: http://www.rimfrost.no/
Last edited by Jakobsli; 07-17-2016 at 03:17 AM..
Reason: Credit image
CO2 levels must of melted the mile thick ice covering Chicago 20,000 years ago
I promised myself not to contribute to this thread with some Ludacris comments. So have fun everyone.
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.
Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
