README =============================================================================== Message from Betty Croft (2/9/18): Attached is a high-resolution (1440x720x12) Arctic seabird-colony NH3 emissions file in netCDF format. This file can be implemented with HEMCO by adding the following line to the GEIA section of HEMCO_Config.rc. 0 SEABIRD_NH3 /PATH/TO/THE/FILE/NH3_Arctic_seabirds.nc NH3_SEABIRDS 1990/1-12/1/0 C xy kg/m2/s NH3 - 30 1 For this first implementation, I have spread the Arctic seabird colony emissions evenly between May 1 and September 30. Please note that this file contains emissions north of 50N only. The total annual emissions for this region should be 35.5989 Gg NH3. Future work should examine the seasonal cycle of seabird emissions for the remainder of the globe, south of 50N. I have the data files for annual seabird-colony NH3 emissions for these other regions. However, I think it premature to add these emissions at this time, without a better understanding of the seasonal cycles for these other regions. As well model-measurement comparisons for NH3 in these additional regions is needed. =============================================================================== Original message from Betty Croft (20 Nov 2017): Attached are three files. The third attached file contains the point sources for the seabird colonies as a text file. The 5 columns of this file are latitude, longitude, Scenario 1, 2, and 3 respectively. I have used the moderate scenario, Scenario 3. Please note that anyone using these seabirds emissions is asked to cite https://data.gov.uk/dataset/global-ammonia-emissions-from-seabirds and If you reuse this data, you should cite: Riddick, S.N., Dragosits, U., Blackall, T.D., Daunt, F., Wanless, S., Sutton, M.A. (2012). Global ammonia emissions from seabirds. Riddick, S. N. et al. Global ammonia emissions from seabirds. NERC Environmental Information Data Centre 10.5285/c9e802b3-43c8-4b36-a3a3-8861d9da8ea9. https://data.gov.uk/dataset/global-ammonia-emissions-from-seabirds (2012) The first attached file is a Matlab script used to create a new netCDF file to replace NH3_geos.4x5.nc. I also used a one line CDO command as noted in this MAtlab script file. The second Matlab script is a check that the emissions in the new netCDF for seabird emissions are equal to those in the point source file. Then I replace NH3_geos.4x5.nc with the new netCDF in HEMCO_Config.rc. Eventually a separate variable in the netCDF file such as NH3_NATB that contained only the seabird emissions would likely be better.