3 ms·

I guess you missed the main point of lack of data in addition to possible quality issues. Certainly I would assume we collect many more air temperature readings

by cc344 4y ago

I guess you missed the main point of lack of data in addition to possible quality issues. Certainly I would assume we collect many more air temperature readings now then we did in the 1800’s even into the 1900’s. I can’t imagine there are nearly as much temperature data from 100 years ago compared to how much data is being collected in the last 30. You didn’t answer the real question, of course a thermometer works the same, but does the collection methods work the same? Did we have satellite data 100 years ago? Obviously not. We are collecting a much wider variety of data from a variety of sensors and it has built up especially in the last 50 years. I haven’t seen the data I’m only asking the question. What does the data look like, I’d love to compare just a slice from one city. Someone post the data from that data set that compares 100 years ago reading to ones collected in 20 year intervals. My guess is that there is progressively more and more data as you move forward. If I’m wrong show me the data.

counters 4y ago
> but does the collection methods work the same? Yes, more or less, they're the same. It's simple enough to restrict measurements to just surface observations made with a thermometer of some sort if you want a wholly apples-to-apples, long-term temperature record. You don't have to add in satellite data (satellites don't directly retrieve surface air temperature so the direct comparison is fraught) although there do exist techniques which leverage it to augment the lack of spatial coverage of surface observations, especially over oceans. Quality issues have been studied ad nauseum over the past thirty years. Nearly half a dozen independent efforts have all tackled this problem. Probably the most notable recent one is the Berkeley Earth Land/Ocean Temperature Record (Rohde and Hausfather, 2020 -https://essd.copernicus.org/articles/12/3469/2020/essd-12-3469-2020.html https://essd.copernicus.org/articles/12/3469/2020/essd-12-34...).

by cc344 4y ago

counters 4y ago

> but does the collection methods work the same? Yes, more or less, they're the same. It's simple enough to restrict measurements to just surface observations made with a thermometer of some sort if you want a wholly apples-to-apples, long-term temperature record. You don't have to add in satellite data (satellites don't directly retrieve surface air temperature so the direct comparison is fraught) although there do exist techniques which leverage it to augment the lack of spatial coverage of surface observations, especially over oceans. Quality issues have been studied ad nauseum over the past thirty years. Nearly half a dozen independent efforts have all tackled this problem. Probably the most notable recent one is the Berkeley Earth Land/Ocean Temperature Record (Rohde and Hausfather, 2020 -https://essd.copernicus.org/articles/12/3469/2020/essd-12-3469-2020.html https://essd.copernicus.org/articles/12/3469/2020/essd-12-34...).