change the units and description for number fractions of dust in GLOMAP

Author: mo-hlawrence

Metadata-standard-names.md

@@ -455,10 +455,10 @@ Note that appending '_on_previous_timestep' to standard_names in this section yi
     * `real(kind=kind_phys)`: units = kg kg-1
 * `mass_fraction_of_dust_accumulation_aerosol_particles_in_air`: Mass fraction of accumulation mode dust aerosol particles
     * `real(kind=kind_phys)`: units = kg kg-1
-* `number_fraction_of_coarse_aerosol_particles_in_air`: Number fraction of coarse mode dust aerosol particles
-    * `real(kind=kind_phys)`: units = particles particles-1
-* `number_fraction_of_accumulation_aerosol_particles_in_air`: Number fraction of accumulation mode dust aerosol particles
-    * `real(kind=kind_phys)`: units = particles particles-1
+* `number_fraction_of_coarse_aerosol_particles_in_air`: Ratio of number concentration of coarse mode dust aerosol particles to the molecular concentration of air
+    * `real(kind=kind_phys)`: units = particles molecules-1
+* `number_fraction_of_accumulation_aerosol_particles_in_air`: Ratio of number concentration of accumulation mode dust aerosol particles to the molecular concentration of air
+    * `real(kind=kind_phys)`: units = particles molecules-1
 ## emissions
 Emissions variables, contributed for the Community Emissions Data System (CEDS)
 * `emissions_of_co_due_to_anthropogenic`: Carbon monoxide emissions from anthropogenic sources, total

standard_names.xml

@@ -797,12 +797,12 @@
       <type kind="kind_phys" units="kg kg-1">real</type>
     </standard_name>
     <standard_name name="number_fraction_of_coarse_aerosol_particles_in_air"
-                   long_name="Number fraction of coarse mode dust aerosol particles">
-      <type kind="kind_phys" units="particles particles-1">real</type>
+                   long_name="Ratio of number concentration of coarse mode dust aerosol particles to the molecular concentration of air">
+      <type kind="kind_phys" units="particles molecules-1">real</type>
     </standard_name>
       <standard_name name="number_fraction_of_accumulation_aerosol_particles_in_air"
-                   long_name="Number fraction of accumulation mode dust aerosol particles">
-      <type kind="kind_phys" units="particles particles-1">real</type>
+                   long_name="Ratio of number concentration of accumulation mode dust aerosol particles to the molecular concentration of air">
+      <type kind="kind_phys" units="particles molecules-1">real</type>
     </standard_name>
   </section>
   <section name="emissions"