The stratosphere has been cooling for 30 years!Posted By Dave Snope |
Couple of interesting points on the TLS plots:
About those two warm spikes: Satellite measurements of the lower stratosphere (TLS) reveal two marked warm periods (as much as 1.5oC warmer), caused by sulfuric acid aerosols deposited in this layer by the eruptions of El Chichón in 1982 and Pinatubo in 1991.
On the negative trend: These two warm periods are concurrent with a strong cooling trend over the 19-year period that has been attributed to ozone depletion in the lower stratosphere... The TLS channel shows a negative trend, and along with the ozone depletion factor, indicates that we aren’t getting much heat transport from the troposphere into the stratosphere.
The trend looks flat for the last 15 years. Is that from ozone control, solar activity, no greenhouse change, or is it just too short a period to draw any conclusions from?
About those two warm spikes: Satellite measurements of the lower stratosphere (TLS) reveal two marked warm periods (as much as 1.5oC warmer), caused by sulfuric acid aerosols deposited in this layer by the eruptions of El Chichón in 1982 and Pinatubo in 1991.
On the negative trend: These two warm periods are concurrent with a strong cooling trend over the 19-year period that has been attributed to ozone depletion in the lower stratosphere... The TLS channel shows a negative trend, and along with the ozone depletion factor, indicates that we aren’t getting much heat transport from the troposphere into the stratosphere.
The trend looks flat for the last 15 years. Is that from ozone control, solar activity, no greenhouse change, or is it just too short a period to draw any conclusions from?