Methane conversion factors (percent) by manure management system and
climate zone, using "All" for the systems that take a single factor.
Source
Predominantly the 2006 Guidelines, Vol 4, Ch 10, Table 10.17,
whose cool/temperate/warm structure this table follows. The 2019
Refinement's Table 10.17 (Updated) is resolved by ten climate zones and
by liquid-system retention time instead, and differs in level: it gives
a single 0.47 percent for pasture/range/paddock against 1.0/1.5/2.0
here, and 1.0/2.0/2.5 for static-pile and passive-windrow composting
against 0.5/0.5/0.5 and 1.0/1.0/1.5 here. Some cells match neither
edition: dry lot 1.5/2.5/4.0 (both editions give 1.0/1.5/2.0),
intensive-windrow composting 0.5/0.5/0.5 (both give 0.5/1.0/1.5),
passive-windrow composting 1.0/1.0/1.5 (2006 gives 0.5/1.0/1.5, the
2019 Refinement 1.0/2.0/2.5), pit storage under one month 3/3/5 (2006
gives 3/3/30) and liquid/slurry with crust warm 47 percent, which is in
no column of that 2006 row (its warm class runs 44 percent at 26 degrees,
48 at 27 and 50 at 28 or above) and in no cell of the 2019 table.
"Anaerobic Digester" 0 is not a published default in either edition:
2006 Table 10.17 gives the range 0-100 percent and requires the compiler
to calculate it, and the 2019 Refinement resolves it into six
leakage-and-storage classes spanning 1.00 to 13.17 percent.
Assumed, unverified. Where a 2006 row is resolved per degree Celsius
the value taken is not always the mid-point of the class: uncovered
anaerobic lagoon temperate 73 percent is the 14 degree column, not the
78 percent of 20 degrees, and liquid/slurry without crust and pit storage
over one month take 35 percent for temperate, which is the 18 degree
column rather than the 42 percent of 20 degrees. Tracked in whep#601.
Examples
ipcc_2019_mcf_manure
#> # A tibble: 47 × 3
#> system climate_zone mcf_percent
#> <chr> <chr> <dbl>
#> 1 Pasture/Range/Paddock Cool 1
#> 2 Pasture/Range/Paddock Temperate 1.5
#> 3 Pasture/Range/Paddock Warm 2
#> 4 Daily Spread Cool 0.1
#> 5 Daily Spread Temperate 0.5
#> 6 Daily Spread Warm 1
#> 7 Solid Storage Cool 2
#> 8 Solid Storage Temperate 4
#> 9 Solid Storage Warm 5
#> 10 Dry Lot Cool 1.5
#> # ℹ 37 more rows