A while ago I compared satellite temperature data to that from balloon-borne instruments. I used the RSS satellite data (the deniers’ favorite), but since then they have revised their data. Several readers have requested an updated comparison, using the new RSS release.
I can’t use the TLT (lower-troposphere temperature) for comparison because RSS hasn’t yet revised that product. But they have updated the TTT (total-troposphere temperature) data, so let’s see how that compares to radiosonde (balloon-borne) data, before and after the new improved RSS version.
Here are all three: radiosonde data from RATPAC (Radiosonde Atmospheric Temperature Product for Assessing Climate), the prior version of RSS (v3.3) in blue, and the improved version (4) in red:
The new version warms faster than the old, and by doing so its trend matches that of the balloon data better. This is more easily seen in the differences between RSS data and RATPAC, the left graph for v3.3, the right for v4:
Indeed the updated data match the balloon data better, and their difference no longer shows the large downward trend it showed before. But there’s still a significant difference, with RSSv4 warming a bit faster than balloon data early, a bit more slowly later.
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