Cement emissions?

[bpbond]

Email from @ssmithClimate

I’m in a CMIP harmonization call, and looking at some of the interfaces for emissions -> SCMs. One issue that may come up is hector wanting some ore specific LULUC input that won’t be available from the CMIP process (where it looks like only the old-style net LULUC CO2 emissions will be provided.).

The issue of CO2 carbonization from cement just came up as well. Do we have that pinned as a potential issue to address from either the GCAM or hector side? Ideally we should include that in our modeling - I don’t have an opinion at this point if this better to do in GCAM and adjust the CO2 passed to hector or do this on the hector side (If not we should flag that for discussion.). It's a separate line item now in the global carbon budget.

[ssmithClimate]

For context, here is the magnitude of the cement carbonation sink since 2000 (from GCP 2023). These represent a flux from the atmosphere to land. Historical values we have from GCP, but part of the issue will also be how to calculate these for the future using GCAM data, so there's a GCAM linking question as well.

Year cement carbonation sink 2000 0.083536938 2001 0.086109401 2002 0.090522969 2003 0.097275016 2004 0.104064894 2005 0.111160968 2006 0.121018477 2007 0.130367979 2008 0.134660751 2009 0.141512386 2010 0.150279147 2011 0.162719085 2012 0.169239681 2013 0.177229223 2014 0.184932111 2015 0.185938922 2016 0.188003953 2017 0.192072616 2018 0.198195623 2019 0.201583196 2020 0.206857741 2021 0.216462506 2022 0.217464615

From GCB: Full details of the method are described in Friedlingstein et al (2023).