Scheduled Downtime
On Tuesday 24 October 2023 @ 5pm MT the forums will be in read only mode in preparation for the downtime. On Wednesday 25 October 2023 @ 5am MT, this website will be down for maintenance and expected to return online later in the morning.
Normal Operations
The forums are back online with normal operations. If you notice any issues or errors related to the forums, please reach out to help@ucar.edu

About the Citation of Nitrogen Deposition and Ozone Data

Status
Not open for further replies.
L

lucia

luyaohuang
Member
I am running the CLM model and would like to ask something. I haven't made any changes to nitrogen deposition or ozone. The nitrogen deposition data I’m currently using is from:

ndepmapalgo = 'bilinear'
stream_fldfilename_ndep = '/data01/huangluyao/hly/model/clm/cesm/inputdata/lnd/clm2/ndepdata/fndep_clm_hist_simyr1849-2006_1.9x2.5_c100428.nc'
stream_year_first_ndep = 1850
stream_year_last_ndep = 1850

I would like to ask where this data is sourced from since I couldn't find it in the nc file. If I want to reference it, how should I properly cite this data? Additionally, is there ozone input in the default CLM case? I couldn't find it. If there is, how should the ozone data be cited?"
 
Sort by date Sort by votes
O

oleson

Keith Oleson
CSEG and Liaisons
Staff member
You just be using an old version of CLM (CLM4 perhaps?). I think you could cite the CLM4 paper for nitrogen deposition:

Lawrence, D.M., K.W. Oleson, M.G. Flanner, P.E. Thornton, S.C. Swenson, P.J. Lawrence, X. Zeng, Z.-L. Yang, S. Levis, K. Sakaguchi, G.B. Bonan, and A.G. Slater, 2011: Parameterization improvements and functional and structural advances in version 4 of the Community Land Model, J. Adv. Model. Earth Syst., 3, M03001, DOI:10.1029/2011MS000045.

In that paper, it states that the nitrogen deposition is from Lamarque et al. 2010.

I don't think CLM4 had any ozone input.
 
Vote Upvote 0 Downvote
L

lucia

luyaohuang
Member
Thank you very much, Keith. I am indeed using the old version 5.0. Is there no ozone input in CLM5.0 as well? I couldn't find any ozone data in the input files.
 
Vote Upvote 0 Downvote
O

oleson

Keith Oleson
CSEG and Liaisons
Staff member
There is ozone input in CLM5 if you set use_ozone=.true. In the release version of the model forc_ozone = 100._r8 * 1.e-9_r8. In later versions of the model, it comes in through streams.
I'm still confused by why your case is using fndep_clm_hist_simyr1849-2006_1.9x2.5_c100428.nc. That is for CLM4 as indicated by the namelist:

bld/namelist_files/namelist_defaults_clm4_0.xml:<stream_fldfilename_ndep hgrid="1.9x2.5" bgc="cn">lnd/clm2/ndepdata/fndep_clm_hist_simyr1849-2006_1.9x2.5_c100428.nc</stream_fldfilename_ndep>

For CLM5, I think the case should be using:

<stream_fldfilename_ndep phys="clm5_0" hgrid="0.9x1.25" use_cn=".true." ssp_rcp="hist" >lnd/clm2/ndepdata/fndep_clm_hist_b.e21.BWHIST.f09_g17.CMIP6-historical-WACCM.ensmean_1849-2015_monthly_0.9x1.25_c180926.nc</stream_fldfilename_ndep>
 
Vote Upvote 0 Downvote
Status
Not open for further replies.
Top