Merge remote-tracking branch 'origin/main' into cm1-p3

notebooks/setup/where-are-the-rolls.ipynb

@@ -61,15 +61,15 @@
     "\n",
     "## Discussion and community input welcomed\n",
     "\n",
-    "Under conditions of large stability parameter (-z_i/L > 10), where L is the Monin-Obukhov length, [Gryschka et al. (2008)](https://onlinelibrary.wiley.com/doi/abs/10.1029/2008GL035845) used LES to show that roll formation requires triggering by sea ice temperature heterogeneities. They referred to such rolls as forced, in contrast to self-organizing rolls that occur when surface fluxes are weaker. At 2 h, the 13 March case exhibits z_i of roughly 1000 m and L of roughly –80 m, consistent with stability parameter > 10, placing this case into the forced category. In follow-on work [Gryschka et al. (2014)](https://onlinelibrary.wiley.com/doi/abs/10.1002/2014JD022160) compare simulations with and without roll-generating sea ice heterogeneity, and conclude that total surface fluxes do not significantly differ because the rolls assume part of the transport that is otherwise turbulent rather than organized. They therefore suggest that forced roll convection is not necessary to include in weather and climate model parameterization schemes.\n",
+    "Under conditions of large stability parameter (-z_i/L > 10), where L is the Monin-Obukhov length, [Gryschka et al. (2008)](https://onlinelibrary.wiley.com/doi/abs/10.1029/2008GL035845) used LES to show that roll formation requires triggering by sea ice temperature heterogeneities. They referred to such rolls as forced, in contrast to self-organizing rolls that occur when surface fluxes are weaker. At 2 h, the 13 March case exhibits z_i of roughly 1000 m and L of roughly –80 m, consistent with stability parameter > 10, placing this case into the forced category. In follow-on work, [Gryschka et al. (2014)](https://onlinelibrary.wiley.com/doi/abs/10.1002/2014JD022160) compare simulations with and without roll-generating sea ice heterogeneity, and conclude that total surface fluxes do not significantly differ because the rolls assume part of the transport that is otherwise turbulent rather than organized. They therefore suggest that forced roll convection is not necessary to include in weather and climate model parameterization schemes.\n",
     "\n",
-    "Nonetheless, in this case, at least one group had difficulty sustaining rolls even when ice edge heterogeneity was included (Mikhail Ovchinnikov, personal communication). Gryschka et al. (2008) also find it worth mentioning that along-roll wind shear or shear curvature below 0.2z_i may also lead to forced rolls in the absence of upwind surface heterogeneity. Young et al. (2002) further conclude that candidate processes contributing to the range of observed atmospheric roll behaviors include surface buoyancy flux, latent heat release, roughness-induced shear, and baroclinically induced shear---as well as tropospheric gravity waves that may undergo three different trapping mechanisms and whose effects may depend on the angle between the shear vector within the boundary layer versus above, consistent with a conceptual model wherein the overshooting convection poses an obstacle to the relative wind. While DHARMA simulations do exhibit strong gravity waves under both ACTIVATE conditions and in the 13 May case (Fig. 6), observations of ice edge and thermodynamic and wind profile conditions are lacking to confirm apparent shortfalls in the case specification.\n",
+    "Nonetheless, in this case, at least one group had difficulty sustaining rolls even when ice edge heterogeneity was included (Mikhail Ovchinnikov, personal communication). [Gryschka et al. (2008)](https://onlinelibrary.wiley.com/doi/abs/10.1029/2008GL035845) mention that along-roll wind shear or shear curvature below 0.2z_i may also lead to forced rolls in the absence of upwind surface heterogeneity. [Young et al. (2002)](https://journals.ametsoc.org/view/journals/bams/83/7/1520-0477_2002_083_0997_rswama_2_3_co_2.xml) further conclude that candidate processes contributing to the range of observed atmospheric roll behaviors include surface buoyancy flux, latent heat release, roughness-induced shear, and baroclinically induced shear---as well as tropospheric gravity waves that may undergo three different trapping mechanisms and whose effects may depend on the angle between the shear vector within the boundary layer versus above. While DHARMA simulations do exhibit strong gravity waves under both ACTIVATE conditions and in the 13 May case (Fig. 6), observations of ice edge and thermodynamic and wind profile conditions are lacking to confirm apparent shortfalls in the case specification. Finally, mechanisms associated with ice edge heterogeneity could be difficult or impossible to represent in Lagrangian LES with fully periodic boundary conditions.\n",
     "\n",
     "![DHARMA_w](../../figures/vertical_wind_cross_section.png)\n",
     "\n",
     "*Figure 6. Vertical wind cross-section in a DHARMA LES simulation of the 13 March case reveals vertical motions overlying the MBL that reach several kilometers into the overlying stable free troposphere.*\n",
     "\n",
-    "We welcome further discussion and sensitivity test results from enterprising modelers!\n",
+    "We welcome further discussion, as well as submission of sensitivity test results that explore potential tweaks to the current COMBLE-MIP specification in order to better represent the observed cloud streets.\n",
     "\n",
     "___\n",
     "\n",
@@ -79,7 +79,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "e5346e01-81ac-4aa7-a44c-41251b47adde",
+   "id": "8e073d6a-6d24-4e9d-9ffe-c1dddca52f80",
    "metadata": {},
    "outputs": [],
    "source": []