2 Peter Huybers

Modern climate change

How and why has climate changed over the last century?
  • Duo Chan compared sea surface temperatures from ships that cross nearby one another to quantify systematic offsets between different groups of reports. Duo used a linear mixed effects methodology to intercalibrate millions of observations ( 2009a). Correcting for the biases introduced by shifting sea surface temperature offsets associated with different groups makes the pattern of warming during the Early 20th Century more homogeneous, moderating strong warming trends in the North Atlantic and reversing a cooling trend in the North Pacific (2019b). NPR covered this story well (link).
  • Maya Chung won a Hoopes prize (2019) for her senior thesis on "Quantifying Isopycnal Heave Using Dynamic Depth Warping". Maya developed an algorithm to align vertical temperature and salinity profiles amongst repeat soundings, allowing her to globally quantify vertical motions in the upper 2000m of the ocean. She identified distinct signals from the seasonal cycle, El Nino, and climate trends, and is writing up these results for publication.
  • Jake Gebbie explored the implications of variations in surface climate over the last millenium for deep ocean temperature trends, leading to a prediction that the deep North Pacific has been cooling over the last century as it continues to respond to the transition into the Little Ice Age (2019). The predictions are consistent with comparing full-depth temperature changes foudn between the 1980s observaitons from the World Ocean Circulation Experiment and the 1870s Challenger Expedition.

References

  • Chan, Kent, Berry, and Huybers, Correcting datasets leads to more homogeneous early-twentieth-century sea surface warming , Nature, 2019. link.
  • Chan and Huybers, Systematic differences in bucket sea surface temperature measurements amongst nations identified using a linear-mixed-effect method, Journal of Climate, 2019. pdf
  • Gebbie and Huybers, The Little Ice Age and 20th century deep Pacific cooling, Science, 2019. link

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