Add checkpoint and draft README.md

README.md

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-license: apache-2.0
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+---
+license: apache-2.0
+---
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+<img src="ACE-logo.png" alt="Logo for the ACE Project" style="width: auto; height: 50px;">
+
+# ACE2-SOM
+
+Ai2 Climate Emulator (ACE) is a family of models designed to simulate atmospheric variability from the time scale of days to centuries.
+
+**Disclaimer: ACE models are research tools and should not be used for operational climate predictions.**
+
+ACE2-SOM is the first model we have trained to emulate the sensitivity of climate to substantial increases in carbon dioxide.  It consists of ACE2 coupled to a highly simplified physics-based ocean mode, called a slab ocean model, and is trained on equilibrium-climate output from GFDL's SHiELD model coupled to an identical slab ocean with carbon dioxide concentrations of the present-day, double the present-day, and quadruple the present-day.
+
+Quick links:
+- 📃 [Paper (TODO: update)]()
+- 💻 [Code](https://github.com/ai2cm/ace)
+- 💬 [Docs](https://ai2-climate-emulator.readthedocs.io/en/stable/)
+- 📂 [All Models](https://huggingface.co/collections/allenai/ace-67327d822f0f0d8e0e5e6ca4)
+
+Briefly, the strengths of ACE2-SOM are:
+- accurate emulation equilibrium climates with CO2 concentrations ranging from the present-day to four times the present-day concentration, including
+  - the spatial pattern of temperature and precipitation changes between climates
+  - changes in precipitation extremes between climates
+- realistic emulation non-stratospheric fields with gradually changing CO2 concentration between the present-day and four times the present-day concentration.
+
+Some known weaknesses are:
+- Sea-ice coverage, ocean heat transport, and ocean mixed layer depth are prescribed based on a present-day climatologies and therefore do not respond to changes in CO2.  Presribed sea-ice in particular means projections with ACE2-SOM are missing an important feedback mechanism known to amplify warming in the polar regions.
+- Abrupt regime shifts in stratospheric temperature and moisture can occur in inference runs with changing CO2 concentration.
+- Adjustment to an abrupt change in CO2 concentration occurs too quickly, violating energy conservation.
+- Sensitivities of the surface and top of atmosphere radiative fluxes to changes in CO2 with the atmospheric state held fixed are not always realistic.

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