Fixed the volc diags bounds crash

[saneku]

Fixed volcanic diagnostics bounds crash and minor volcanic transport fixes.

TYPE: bug fix

KEYWORDS: volcanic run, chem_opt=402, volcanic diagnostics, wet scavenging, emissions

SOURCE: Alexander Ukhov (KAUST)

DESCRIPTION OF CHANGES:

Problem:
Several volcanic diagnostic explicit interfaces declared volc_diags with a hard-coded third dimension of 1:9. The Registry-generated volcanic diagnostics package is sized by num_volc_diags, and p_ash_fall resolves to index 10. Debug builds with bounds checking therefore crashed in module_vash_settling when writing volc_diags(i,j,p_ash_fall). Optimized builds did not expose the bounds violation consistently.

Solution:
Replaced hard-coded volc_diags(...,1:9) declarations with volc_diags(...,num_volc_diags), and imported num_volc_diags where needed.

Additional minor fixes:

• Updated volcanic emission cell-area calculation to use map factors per active eruption grid cell.
• Ensured convective wet scavenging density is initialized before use in module_ctrans_grell.

LIST OF MODIFIED FILES:
M chem/dry_dep_driver.F
M chem/emissions_driver.F
M chem/mechanism_driver.F
M chem/module_ctrans_grell.F
M chem/module_vash_settling.F
M chem/module_volc_chem.F

TESTS CONDUCTED:

• Ran volcanic WRF-Chem simulation with chem_opt=402 using a debug build with bounds checking. The previous p_ash_fall / volc_diags bounds crash no longer occurs.
• Ran volcanic WRF-Chem simulation with chem_opt=402 using a non-debug optimized build. The simulation also runs successfully.

RELEASE NOTE:
Fixed a volcanic diagnostics bounds crash for chem_opt=402 and included minor volcanic emissions / scavenging
fixes.

[weiwangncar]

The regression test results:

Test Type              | Expected  | Received |  Failed
= = = = = = = = = = = = = = = = = = = = = = = =  = = = =
Number of Tests        : 23           24
Number of Builds       : 60           57
Number of Simulations  : 158           150        0
Number of Comparisons  : 95           86        0

Failed Simulations are: 
None
Which comparisons are not bit-for-bit: 
None