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ESCOMP / CTSM

Community Terrestrial Systems Model (includes the Community Land Model of CESM)
http://www.cesm.ucar.edu/models/cesm2.0/land/
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Incorporate the impact of O₂ concentration on fuel flammability #2728

Open samsrabin opened 1 month ago

samsrabin commented 1 month ago

incorporate the impact of O₂ concentration on fuel flammability to address the fire overestimation in Tibet:

(1) Add:

forc_po2 => atm2lnd_inst%forc_po2_grc, & ! Input: [real(r8) (:)]  O2 partial pressure (Pa)

(2) fire_m should be changed to:

fire_m = ((afuel*arh30+(1._r8-afuel)*arh)**1.5_r8) &
     *((1._r8-btran_col(c)/wtlf(c))**0.5_r8) &
     *min(1._r8, max(0._r8, (forc_po2(g)-15000)/2500._r8))

Originally posted by @lifang0209 in https://github.com/ESCOMP/CTSM/issues/2726#issuecomment-2307841940

lifang0209 commented 1 week ago

@samsrabin @ekluzek @wwieder Sam requested a figure demonstrating the impact of the O₂ limit. The attached figure displays the spatial distribution of the annual burned area fraction. Observations (obs) represent the average of three satellite-based burned area products (GFED5s, FireCCI, and MODIS C6). Simulations show results for the new fire schemes both with and without an O₂ limit. The figure includes global burned area totals and spatial correlation coefficients (R) between observations and simulations. As illustrated, the O₂ limit reduces the overestimation of the burned area fraction in Tibet, and improves the spatial pattern simulation performance (global spatial correlation with observations increases from 0.76 to 0.79). o2limit

samsrabin commented 1 week ago

Thanks, Fang! I'm assuming that's for 2001-2020 or so?

wwieder commented 1 week ago

Thanks, Fang.

lifang0209 commented 1 week ago

Thanks, Fang! I'm assuming that's for 2001-2020 or so?

Hi Sam, this is for 2001-2014 and CTSM5.2 with fire scheme updates forced by CRUJRA. I'll check the CTSM5.3 outputs soon to make sure everything about the fire scheme goes correctly.