G
gomer_tree
Guest
OK, so I haven’t read this whole thread, and if I repeat a few things, I apologize. But I spend a lot of time poring over the actual data and looking at research in this area, and here’s what I see:
Since 1880, the earth has warmed, according to the NASA GISS temperature anomalies by a little less than 0.6 degrees Celsius per century. It is very evident when viewing the longer-term chart that there are cycles in the temperature that will slope up at higher levels and trend down at other times, with a long-term trend upward. The longer-term warming trend is basically a longer-term natural cycle that can be seen when examining a plot of temperature over the last century. Since the period of the “Maunder Minimum” and then the “Dalton Minimum” the earth has rebounded and warmed. Most of the warming of the last century is not anthropogenic. However, it cannot be ignored that there have been CO2 emissions that have increased the ppm to the current level of the upper 300s. The global ppm charts show this increase. What is often not relayed, however, is the logarithmic nature of warming due to incremental CO2. This means that the first 20 ppm led to a 1.2 degree increase in temperature, but the incremental imacts fall so dramatically after that such that the increments we are talking about now account for a tenth or two of temperature increase, and further emissions will account for less than that.
To understand this concept, think about covering an uninsulated house with a small layer of insulation. The first layer will have a dramatic impact. The second layer will have some impact. At some point, lopping on additional layers has virtually no impact. Greenhouse gases act in the same way. It’s simple physics.
From the 1970s to 2001, there was a high slope in temps. But even in the most favorable data, GISS NASA, temperature has declined since 2001. The more accurate satellite temperature readings (RSS MSU and UAH) show cooling since 1998. The issues with GISS include the fact that it is highly extrapolated surface-station data with a lot of assumptions. In addition, they pass the data through an algorithm such that historical temperature numbers continually change, even back to early in the century. GISS is the only data set that shows temperature peaks above 1998 levels of all the data sets. Dr. Hansen, not coincidentally, is a very vocal proponent of AGW, and is widely believed to have a dog in the race, and so many skeptics look at the GISS data skeptically, especially given completely unadjusted satellite data now exists that is at odds. The pro-AGW people will argue that it’s a difference between surface station and atmospheric readings, perhaps with some validity. But the overall trends should remain the same even if certain periods differ.
More importantly, the Pacific Decadal Oscillation shifted from a cooling phase in 1977 to a warming phase, and has just recently flipped again. This will most assuredly lead to cooling, even admitted by most AGW proponents. The current sunspot cycle 23 is still not over. Cycle 24 officially begins only when there are more cycle 24 spots than cycle 23 spots. That has not happened yet. There are studies that indicate temperatures following a solar cycle depend much more on the previous cycle length than the amplitude of its maximum. The impact is estimated to be 0.7 degrees cooler for each year past the average of 10.7 years. Cycle 23 has a real possibility of reaching 13 years, which doesn’t bode well for the next few years. If a weak cycle 24 follows, the effect will be exacerbated.
A paper by Theodor Landscheidt a couple decades ago explored the sun’s impact on our climate in terms of its torque (angular) momentum. There are very occasional periods where the angular momentum reaches zero in a location near the center of mass of the solar system. Without going into details, the only times in recorded history these incidents happened were followed by a minimum of one degree or another, which began with an 8-year lag from the incident. This study was done in the 1980s, and in 1990 one of those incidents occurred. The satellite data shows cooling since 1998, and now we have a long cycle with an extended minimum, with high potential of a weak cycle 24, a flipping PDO cycle, a flipping Atlantic Multidecadal Oscillation cycle, and all indications point to cold weather ahead. Landscheidt predicted an impact, based on his calculations, of a Grand Minimum in temperature similar to the Maunder Minimum (The Little Ice Age) of the 1600s, by 2030.
But what do I know?
Since 1880, the earth has warmed, according to the NASA GISS temperature anomalies by a little less than 0.6 degrees Celsius per century. It is very evident when viewing the longer-term chart that there are cycles in the temperature that will slope up at higher levels and trend down at other times, with a long-term trend upward. The longer-term warming trend is basically a longer-term natural cycle that can be seen when examining a plot of temperature over the last century. Since the period of the “Maunder Minimum” and then the “Dalton Minimum” the earth has rebounded and warmed. Most of the warming of the last century is not anthropogenic. However, it cannot be ignored that there have been CO2 emissions that have increased the ppm to the current level of the upper 300s. The global ppm charts show this increase. What is often not relayed, however, is the logarithmic nature of warming due to incremental CO2. This means that the first 20 ppm led to a 1.2 degree increase in temperature, but the incremental imacts fall so dramatically after that such that the increments we are talking about now account for a tenth or two of temperature increase, and further emissions will account for less than that.
To understand this concept, think about covering an uninsulated house with a small layer of insulation. The first layer will have a dramatic impact. The second layer will have some impact. At some point, lopping on additional layers has virtually no impact. Greenhouse gases act in the same way. It’s simple physics.
From the 1970s to 2001, there was a high slope in temps. But even in the most favorable data, GISS NASA, temperature has declined since 2001. The more accurate satellite temperature readings (RSS MSU and UAH) show cooling since 1998. The issues with GISS include the fact that it is highly extrapolated surface-station data with a lot of assumptions. In addition, they pass the data through an algorithm such that historical temperature numbers continually change, even back to early in the century. GISS is the only data set that shows temperature peaks above 1998 levels of all the data sets. Dr. Hansen, not coincidentally, is a very vocal proponent of AGW, and is widely believed to have a dog in the race, and so many skeptics look at the GISS data skeptically, especially given completely unadjusted satellite data now exists that is at odds. The pro-AGW people will argue that it’s a difference between surface station and atmospheric readings, perhaps with some validity. But the overall trends should remain the same even if certain periods differ.
More importantly, the Pacific Decadal Oscillation shifted from a cooling phase in 1977 to a warming phase, and has just recently flipped again. This will most assuredly lead to cooling, even admitted by most AGW proponents. The current sunspot cycle 23 is still not over. Cycle 24 officially begins only when there are more cycle 24 spots than cycle 23 spots. That has not happened yet. There are studies that indicate temperatures following a solar cycle depend much more on the previous cycle length than the amplitude of its maximum. The impact is estimated to be 0.7 degrees cooler for each year past the average of 10.7 years. Cycle 23 has a real possibility of reaching 13 years, which doesn’t bode well for the next few years. If a weak cycle 24 follows, the effect will be exacerbated.
A paper by Theodor Landscheidt a couple decades ago explored the sun’s impact on our climate in terms of its torque (angular) momentum. There are very occasional periods where the angular momentum reaches zero in a location near the center of mass of the solar system. Without going into details, the only times in recorded history these incidents happened were followed by a minimum of one degree or another, which began with an 8-year lag from the incident. This study was done in the 1980s, and in 1990 one of those incidents occurred. The satellite data shows cooling since 1998, and now we have a long cycle with an extended minimum, with high potential of a weak cycle 24, a flipping PDO cycle, a flipping Atlantic Multidecadal Oscillation cycle, and all indications point to cold weather ahead. Landscheidt predicted an impact, based on his calculations, of a Grand Minimum in temperature similar to the Maunder Minimum (The Little Ice Age) of the 1600s, by 2030.
But what do I know?