Fix contours on global data plot (#654)

Author: brian-rose

core/cartopy/cartopy.ipynb

@@ -652,7 +652,9 @@
    "source": [
     "Plotting data on a Cartesian grid is equivalent to plotting data in the PlateCarree projection, where meridians and parallels are all straight lines with constant spacing. As a result of this simplicity, the global datasets we use often begin in the PlateCarree projection.\n",
     "\n",
-    "Once we create our map again, we can plot these data values as a contour map. We must also specify the `transform` keyword argument. This is an argument to a contour-plotting method that specifies the projection type currently used by our data.  The projection type specified by this argument will be transformed into the projection type specified in the `subplot` method. Let's plot our data in the Mollweide projection to see how shapes change under a transformation."
+    "Once we create our map again, we can plot these data values as a contour map. We must also specify the `transform` keyword argument. This is an argument to a contour-plotting method that specifies the projection type currently used by our data.  The projection type specified by this argument will be transformed into the projection type specified in the `subplot` method. \n",
+    "\n",
+    "Let's plot our data in the Equal Earth global projection {cite:p}`10.1080/13658816.2018.1504949` to see how shapes change under a transformation."
    ]
   },
   {
@@ -662,7 +664,7 @@
    "outputs": [],
    "source": [
     "fig = plt.figure(figsize=(11, 8.5))\n",
-    "ax = plt.subplot(1, 1, 1, projection=projMoll)\n",
+    "ax = plt.subplot(1, 1, 1, projection=ccrs.EqualEarth())\n",
     "ax.coastlines()\n",
     "dataplot = ax.contourf(lon, lat, data, transform=ccrs.PlateCarree())\n",
     "plt.colorbar(dataplot, orientation='horizontal');"
@@ -742,7 +744,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.14.3"
+   "version": "3.14.4"
   }
  },
  "nbformat": 4,