Hello experts!
I am using CLM5 in standalone mode and would like to confirm how the transient atmospheric CO₂ forcing is selected and aligned in DATM.
I am conducting an experiment in which the model simulation period is 1907–1960, but I want both the climate forcing and atmospheric CO₂ concentration to correspond to 1961–2014. For that, I have made the following changes:
DATM_CLMNCEP_YR_START=1961
DATM_CLMNCEP_YR_ALIGN=1907
DATM_CLMNCEP_YR_END=2014
(user_nl_datm file)
strm_year_start = 1961
strm_year_align = 1907
strm_year_end = 2010
After building the case my datm_in shows "datm.streams.txt.co2tseries.20tr 1850 1850 2014".
In particular, with the generated setting
datm.streams.txt.co2tseries.20tr 1850 1850 2014
will model year 1907 receive CO₂ corresponding to 1907 or 1961, or is there another mechanism by which DATM maps the CO₂ stream to the model years?
My objective is specifically to have:
Model year 1907 → CO₂ year 1961...
Model year 1960 → CO₂ year 2014
while keeping the model simulation calendar as 1907–1960.
If the CO₂ stream is independently controlled, what is the recommended way in CLM5 to achieve this temporal alignment?
For example, should I modify the CO₂ stream-specific settings using something like:
year_first = 1961
year_last = 2014
year_align = 1907
taxmode = extend
If this is the correct approach, should these settings be specified through user_nl_datm or by creating a custom CO₂ stream file?
I would also appreciate confirmation on whether using
DATM_CO2_TSERIES = 20tr
is appropriate for this purpose, or whether
DATM_CO2_TSERIES = 20tr.latbnd
would be preferable. My understanding is that 20tr.latbnd concerns the spatial representation of the CO₂ forcing rather than its temporal alignment, but I would appreciate confirmation.
Thank you very much for your help!
I am using CLM5 in standalone mode and would like to confirm how the transient atmospheric CO₂ forcing is selected and aligned in DATM.
I am conducting an experiment in which the model simulation period is 1907–1960, but I want both the climate forcing and atmospheric CO₂ concentration to correspond to 1961–2014. For that, I have made the following changes:
DATM_CLMNCEP_YR_START=1961
DATM_CLMNCEP_YR_ALIGN=1907
DATM_CLMNCEP_YR_END=2014
(user_nl_datm file)
strm_year_start = 1961
strm_year_align = 1907
strm_year_end = 2010
After building the case my datm_in shows "datm.streams.txt.co2tseries.20tr 1850 1850 2014".
In particular, with the generated setting
datm.streams.txt.co2tseries.20tr 1850 1850 2014
will model year 1907 receive CO₂ corresponding to 1907 or 1961, or is there another mechanism by which DATM maps the CO₂ stream to the model years?
My objective is specifically to have:
Model year 1907 → CO₂ year 1961...
Model year 1960 → CO₂ year 2014
while keeping the model simulation calendar as 1907–1960.
If the CO₂ stream is independently controlled, what is the recommended way in CLM5 to achieve this temporal alignment?
For example, should I modify the CO₂ stream-specific settings using something like:
year_first = 1961
year_last = 2014
year_align = 1907
taxmode = extend
If this is the correct approach, should these settings be specified through user_nl_datm or by creating a custom CO₂ stream file?
I would also appreciate confirmation on whether using
DATM_CO2_TSERIES = 20tr
is appropriate for this purpose, or whether
DATM_CO2_TSERIES = 20tr.latbnd
would be preferable. My understanding is that 20tr.latbnd concerns the spatial representation of the CO₂ forcing rather than its temporal alignment, but I would appreciate confirmation.
Thank you very much for your help!