Downgrade to zarr v2 for compatibility

- Use zarr<3.0.0 to match dynamical.org format
- Use xarray<2025.1.0 for zarr v2 support
- Simplify loading code to use consolidated=True
- Remove zarr v3 specific parameters

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app.py

@@ -61,25 +61,10 @@ def load_dataset(dataset_name, use_cache=True):
         url = CATALOG[dataset_name]["url"]
         logger.info(f"Opening zarr store at: {url}")
 
-        # Try different approaches to open the zarr store
-        try:
-            # First try: zarr v2 with consolidated metadata
-            logger.info("Trying zarr_version=2 with consolidated=True")
-            ds = xr.open_zarr(url, zarr_version=2, consolidated=True)
-            logger.info(f"Successfully opened zarr store with consolidated metadata")
-        except Exception as e1:
-            logger.warning(f"Failed with consolidated=True: {e1}")
-            try:
-                # Second try: zarr v2 without consolidated metadata
-                logger.info("Trying zarr_version=2 with consolidated=False")
-                ds = xr.open_zarr(url, zarr_version=2, consolidated=False)
-                logger.info(f"Successfully opened zarr store without consolidated metadata")
-            except Exception as e2:
-                logger.warning(f"Failed with consolidated=False: {e2}")
-                # Third try: default xarray behavior
-                logger.info("Trying default xarray open_zarr")
-                ds = xr.open_zarr(url)
-                logger.info(f"Successfully opened zarr store with default settings")
+        # Open zarr store (using zarr v2)
+        logger.info("Opening with consolidated=True")
+        ds = xr.open_zarr(url, consolidated=True)
+        logger.info(f"Successfully opened zarr store")
         logger.info(f"Dataset dimensions: {dict(ds.dims)}")
         logger.info(f"Dataset variables: {list(ds.data_vars)}")
         logger.info(f"Dataset coordinates: {list(ds.coords)}")

requirements.txt

@@ -1,6 +1,6 @@
 gradio==5.47.2
-xarray>=2025.1.2
-zarr>=3.0.8
+xarray<2025.1.0
+zarr<3.0.0
 fsspec
 aiohttp
 s3fs