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Title:
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bbye/lnd/fertilizer: Flow of Agriculture Nitrogen
Requirements and Design
E3SM
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Land Group
Date:
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Summary
The purpose of this section is to summarize what capability is to be added to the E3SM through this design process. It should be clear what new code will do that the current code does not. Summarizing the primary challenges with respect to software design and implementation is also appropriate for this section. Finally, this statement should contain general statement with regard to what is “success.”code is to add NH3 emissions from fertilizer and livestock waste under different environmental conditions. Volatilization of ammonia is a major pathway of nutrient loss in ecosystems and is the largest emission source of atmospheric NH3. Atmospheric emission, transport, and deposition of NH3 is an important component of the nitrogen cycle, and is sensitive to environmental conditions which are not captured with static emission inventories. This code includes volatilization of NH3 from both livestock manure and synthetic fertilizer as documented in Riddick et al. (2016) and Vira et al. (2020). I will include some of the major requirements in the following design documentation, but details can be found in the published manuscripts linked. There are several modes that FAN can operate with: fan_on (emission calculation only), fan_soil (fan coupled to the soil biogeochemistry), fan_atm (fan coupled to the atmosphere only) and fan_full (coupled to both atmosphere and soil). Of these modes, only fan_on and fan_atm will be scientifically validated as fan_soil and fan_full do not have nitrogen balance checks between ELM and FAN (the N is balanced within FAN and ELM independently).
This code also includes updates to the cropland fertilizer subroutines. Modifications include a gridded synthetic fertilizer dataset of both nitrogen and phosphorous for each crop type, as opposed to the current fixed rates of nitrogen only. These changes are incorporated into the surface dataset and include modifications to the mksurfdat tool for generating surface input data. The fixed fertilizer rate that was used previously will be converted to a manure input, which will be replaced by the FAN stream data when FAN is on.
Requirements
Requirement: name-of-requirement-here
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