Version 4.1 (Release 02/26/19)
------------------------------                                                  
1) Renamed program to OCEANIC to signify emissions beyond just sea salt
   aerosols.

2) Added dimethylsulfide (DMS) emissions estimates using the data from
   Lana et al. (2011).

3) Change to enforce both the upper and lower limits of each sea salt
   flux's applicable size range; previously, only the upper limit was
   considered.

4) Removed 10-m wind calculation, instead determined from U10 and V10
   diagnostic variables from CAMx 2-D met file (these are passed from WRF
   via WRFCAMx interface program -- be sure to turn on "diagnostic"
   variables when you run WRFCAMx so that 10-m winds are available).

5) Miscellaneous cleanup and improved file date/time management.

Version 4.0 (Release 9/18/17)
------------------------------                                                  
1) Major update to the sea salt emissions calculation methodology (the halo-
   methane approach is unchanged):
   a. Added Sofiev et al. (2011) and Ovadnevaite et al. (2014) sea spray flux
      parameterizations as new options.  These approaches include effects of
      sea temperature and salinity, while past approaches have not.  Ovadnevaite
      et al. (2014) in particular reduces SS flux significantly relative to
      the other options.
   b. Removed the Monahan et al. (1986) sea spray flux parameterization. The
      Gong (2003) option remains intact.
   c. Removed the Smith and Harrison (1998) spume flux parameterization for
      coarse sea salt aerosol.  Now only fine SS is estimated by this program.
   d. Fixed the de Leeuw (2000) surf zone implementation to properly convert
      SS size distribution at formation to a dry distribution and conserve
      SS mass in the process (prior conversion was incorrect).
   e. The choice of open ocean and surf zone algorithm is now made by setting
      parameter variables in the code.

2) Modifications to certain parameters and processes:
   a. Fixed sea water composition to include other non-neglibible cations for
      neutral charge balance and to properly include that mass in Na.
   b. Fixed dry NaCl density to 2200 kg/m3 (Grini et al., 2002).
   c. Revised PM size numerical integration scheme.  Integration is performed
      over a fixed PM2.5 size range that is set in the code.
   d. Revised SS flux calculations to use wet diameter for PM2.5 cutpoints
      (based on input surface humidity) instead of dry diameter.
   e. Reduced CAMx-formatted binary input surf zone width by half.

4) Revised user interface according to changes listed above.


Version 3.4 (Release 9/20/16)
------------------------------                                                  
1) The calculation of particle size bins was improved for clarity; no change
   in results.

2) The implementation of sea ice was based on using the CMAQ-based ocean mask,
   in which the fraction of ocean water is independent of the amount of sea ice
   in the CAMx LU file. Thus water = CMAQ ocean - CAMx ice. However, when using
   the original text ocean mask (derived from the CAMx LU file), the fraction
   of exposed ocean water in the CAMx LU file accounts for the amount of sea
   ice.  The code is corrected accordingly.

3) A user-supplied emission scaling factor has been introduced, and is set in
   the job script.  It scales only emissions of particulate Na, Cl, SO4 and
   gas-phase Cl and Br emissions; it does not impact halo-methanes.  The
   default factor is 1.

4) Fixed a minor bug in wind speed calculation.


Version 3.3 (Release 4/8/16)
------------------------------
1) Added an option to read a CAMx-formatted ocean mask file (translated from
   CMAQ).  No need to change previous job script if you want to use the
   original text LWMASK file format. However, the CMAQ ocean mask better
   represents the surf zone and open ocean without the need to define by hand.
   You need to convert the CMAQ file to CAMx format using ncf2uam. Then set:

   setenv BIN_LWMASK T

   And provide the CAMx-formatted ocean mask file on the record:

   Saltwater mask    |

2) Sea ice is now accounted for, as defined in the CAMx 2D landuse file. If a
   grid cell is covered by 75% ice, seasalt emissions will be scaled to 25%.
   This applies to both open ocean and surf zone emissions.

3) Added new projections consistent with CAMx.  General code cleanup
   and speedup.  Bug fix for halo-methane emissions if local hour > 24.


Version 3.2 (Release 2/27/15)
------------------------------
1) Updated to output 2 new explicit gas species: chloride and bromide bound in 
   sea salt aersol (SSCL and SSBR).  These species support the new halogen 
   gas-phase chemistry represented in CAMx mechanism 3 (CB6r2h).  The old "SS"
   species has been removed.


Version 3.1 (Release 5/06/13)
------------------------------
1) Updated to handle CAMx v6+ input file formats.  The v6 format only supports
   the 26-category LU classification scheme.

2) A new algorithm has been developed to calculate halo-methane emissions.  The
   emission algorithm uses satellite-based data of Chlorophyll-A and produces 10
   types of halo-methane species including CH3I.
   Chlorophyll-A images can be obtained from:

   http://orca.science.oregonstate.edu/2160.by.4320.monthly.hdf.chl.gsm.m.php

   Data come in HDF4 format, and must be converted to text format using ncdump.
   See "get_hdf4" sub-directory, obtain ncdump from:

   http://www.hdfgroup.org/release4/obtain.html

3) This version includes a bug fix to the LATLON mapping option.


Version 2.2 (Release 6/05/12)
-----------------------------
Modifications to minimum wind speed:
1) a 0.1 m/s minimum is applied to the input wind field to avoid numerical
   problems in extrapolating the 10-m wind;
2) now a single 2 m/s minimum is applied to the 10-m wind speed for the flux
   calculations of SS and CH3I;


Version 2.1 (5/22/12)
-----------------------------
Updated to be able to read old 11-category or newer 26-category LU files.


Version 2.0 (Release 4/19/12)
-----------------------------
Original distribution.
