Update README with links to refereed manuscripts (#2236)

This PR updates the README with consistent titles and links to the
refereed versions of the ACE2-SOM and Green's Function manuscripts. It
is a copy of #43.

I think it might make sense to merge this first and then in a follow-up
PR make whatever changes to the README we would like to reference
SamudrACE and the associated paper.

cc: @brianhenn

Author: spencerkclark

README.md

@@ -11,8 +11,8 @@ This repo contains code accompanying five papers describing ACE models:
 - "ACE: A fast, skillful learned global atmospheric model for climate prediction" ([link](https://arxiv.org/abs/2310.02074))
 - "Application of the Ai2 Climate Emulator to E3SMv2's global atmosphere model, with a focus on precipitation fidelity" ([link](https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2024JH000136))
 - "ACE2: Accurately learning subseasonal to decadal atmospheric variability and forced responses" ([link](https://www.nature.com/articles/s41612-025-01090-0))
-- "ACE2-SOM: Coupling to a slab ocean and learning the sensitivity of climate to changes in CO2" ([link](https://arxiv.org/abs/2412.04418))
-- "Applying the ACE2 Emulator to SST Green's Functions for the E3SMv3 Global Atmosphere Model" ([link](https://arxiv.org/abs/2505.08742))
+- "ACE2-SOM: Coupling an ML Atmospheric Emulator to a Slab Ocean and Learning the Sensitivity of Climate to Changed CO<sub>2</sub>" ([link](https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2024JH000575))
+- "Applying the ACE2 Emulator to SST Green's Functions for the E3SMv3 Global Atmosphere Model" ([link](https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2025JH000774))
 
 ## Installation