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Great lectures by @sebastian-sippel.bsky.social @frediotto.bsky.social @mdebrito.bsky.social @zscheischlerjak.bsky.social and more!

Find the original @natrevearthenviron.nature.com article with important contributions from co-authors Margot Bador, Raphaël Huser, Lizzie Kendon, Alexander Robinson, and @sebastian-sippel.bsky.social
rdcu.be/eqPrN

5/4 p.s: The new paper by Ishii and colleagues (t.co/YeCrlimA3N) also highlights the sudden changes in NMAT (HadNMAT2 vs. CRUTEM5) around the mid-1910s in their Figure 3.

4/4 The year 1914 is characterised by a strong El-Nino (the uptick is seen consistently in land, SST and NMAT temperatures), the start of WWI and a sudden change in data sources (figure 2 below). Whether any of those events is responsible for the NMAT changes during this time, remains to be seen.

3/4 So it is crucial to better understand the NMAT puzzle piece, as the evidence that comes from ClassNMAT from the perspective of the GMST reconstructions from land vs. ocean is rather split for the 1900-1930 period. It may tell us something important about the ~1900s (1900-1913) vs. 1914 onwards.

2/4 The result is puzzling (figure 1 below, ClassNMAT seen in panel a and b): GMST based on NMATs is indeed *very* cold in the 1900s, following the SST-based GMST time series up until 1913. Yet, from 1914 onwards, the NMAT-based reconstruction is close(r) to the LSAT-based reconstruction...

1/4 Thanks for sharing your reflections! fascinating to read the more personal take behind the nice News&Views piece (www.nature.com/articles/d41...).
Just one after-thought on night marine air temperatures (NMAT). NMATs are a crucial puzzle piece, and we ran a GMST reconstruction for ClassNMAT:

very interesting project! I'm looking forward to learn about the results...

interesting discussion! i've been thinking along similar lines - sea level pressure, precipitation or even sea level height measurements at the time could give very interesting constraints...