Data Request Opportunities - Integration of Marine Biogeochemistry related opportunities

[CMIP-Data-Request-coleads]

Themes:

• Earth System,
• Ocean & Sea-Ice

Description

Integrate different opportunities related to marine biogeochemistry as sub-components, by harmonising requested data and providing dedicated variables groups for each component.

[tomaslovato]

After the cross thematic consultation of sprint #1, it was suggested to consolidate into a single opportunity composed of core and sub-components for those data request addressing marine biogeochemistry.

After a first contact with proposers, these is the list of opportunities involved in this consolidation activity:

• ID 12 : Biological Carbon Sink in the Ocean
• ID 21, ID 32, ID 33 : Fisheries modeling board
• ID 16 : Climate impacts on marine biodiversity and ecosystems
• ID 44 : Marine biogeochemistry (pelagic & sea ice)
• ID 60 : Role of ocean sediments in global ocean biogeochemical cycles
• ID 65 : Uncertainty in changing net primary production
• ID 61 : Southern Ocean BGC to Clouds

In addition, the variable group fishmip_marine_monthly was proposed to support the development of fisheries models (FishMIP)

It is possible to check on a dedicated Airtable view all marine biogeochemical variables (ocnBgchem) from all opportunities and all variable groups.

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The objective of the consolidation is to create a core set of marine biogeochemical variables (and supporting physical ones) and then revise the specific request of each sub-component.

In this shared spreadsheet are reported the variables requested in the above list divided in different sheets according to the scope, with comments indicating possible overlaps with other variable groups or whit the core set.

NOTE: the DR Task Team suggested to create a specific variable group for physical quantities instead of using the baseline variable groups to better track those parameters that are effectively of interest for the opportunity.

The outcome of the process will be a main opportunity, with details about sub-components in its description, and the original opportunities will be then marked as 'merge completed'.

[jessluo]

The role of the sediments in ocean biogeochemical cycling is an emerging topic, with the sediment modeling community originally proposing an opportunity (ID 60) that included 4 existing variables (froc, fric, frn, and frfe), which will be merged with the broader Marine Biogeochemistry opportunity (ID 44). However, there still were 10-15 additional variables that we did not include with our original opportunity, as they were new variables with some requiring new CF standard names.

Upon consultation with the DR author team, we decided to postpone proposing the variables that required new CF standard names, but will propose 7 new variables that do not require new CF standard names.

They are: Omon.expcob : Sinking Flux of Particulate Organic Carbon Reaching the Ocean Bottom [high priority] Omon.expcalcob : Sinking Flux of Calcite Reaching the Ocean Bottom [high priority] Omon.expfeob : Sinking Flux of Particulate Iron Reaching the Ocean Bottom [medium/low priority] Omon.expnob : Sinking Flux of Particulate Organic Nitrogen Reaching the Ocean Bottom [medium/low priority] Omon.exppob : Sinking Flux of Particulate Organic Phosphorus Reaching the Ocean Bottom [medium/low priority] Omon.expsiob : Sinking Flux of Particulate Silicon Reaching the Ocean Bottom [medium/low priority] Omon.exparagob : Sinking Flux of Aragonite Reaching the Ocean Bottom [medium/low priority]

These should be added to ID 60 for later merging with the broader ocean biogeochemistry opportunity.

[tomaslovato]

@jessluo I added the requested variables in the ocean sediments variables group and reported the new list in the shared spreadsheet. Can you have a look at the modifications indicated in the sheet marine_sediments of the shared spreadsheet and let me know if you agree with the proposed changes.

@ledm I proposed some adjustment to the initial list of ID44, so in the shared spreadsheet there are two sheets, one for marine_core_variables and one for marine_bgc_physics. Could you look at the proposed changes and let me know if this works for you.

[jessluo]

@tomaslovato On the marine_sediments tab of the spreadsheet, I noticed that under the Spatial Structure column, the values for frfe and frn are both "Global field (single level)" but for the new export to ocean bottom variables, I put in "Global ocean field on model levels." Does that make a difference, for example -- would it indicate a 3D variable? That is not the intention here. Otherwise, it looks good to me!

[tomaslovato]

@tomaslovato On the marine_sediments tab of the spreadsheet, I noticed that under the Spatial Structure column, the values for frfe and frn are both "Global field (single level)" but for the new export to ocean bottom variables, I put in "Global ocean field on model levels." Does that make a difference, for example -- would it indicate a 3D variable? That is not the intention here. Otherwise, it looks good to me!

I double checked on airtable (data source of the spreadsheet) and the new variables that you created are on "Global ocean field on model levels." (3D field), while these should be 'Global field (single level)' (2D field) as the new variables refer to the value near the ocean bottom.

@jessluo If it is ok for you, I'll revise the variables by setting the grid reference to 'Global field (single level)'.

[jessluo]

Yes, that sounds good to me! That mistake was mine.

[tomaslovato]

@martinjuckes could you please fix the grid definition of the following variables into Global field (single level) Omon.exparagob, Omon.expcalcob, Omon.expcob, Omon.expfeob, Omon.expnob, Omon.exppob, Omon.expsiob

These are all 2D oceanic fields.

[cpetrik]

I am commenting on the variable group fishmip_marine_monthly. Missing: phycalc, zmisc, froc (or epcob?, the downward flux of particulate organic carbon to the ocean bottom (seafloor/sediment)) Other: I think phycnano should be phynano

The carbon concentration of all of the phytoplankton and zooplankton types are needed because many models use, e.g. small and large phytoplankton, as input forcing and these vary by BGC model. The downward flux of particulate organic carbon to the ocean bottom (seafloor/sediment) is necessary for many models and is preferred over extrapolating epc100 using a Martin curve, etc. It is also preferred to epc to the deepest ocean grid cell if that cell is very thick. The FishMIP models use froc as a resource for animals that live on or just above the seafloor.

[ioloi1128]

Hi,

I checked all the variables form the lists: I will need new variables below. Monthly: t20d, t17d, ppalg daily: sos, turbidity

I can create a new variables for these. Alternatively, most of my variable overlay with [D44.baseline_monthly] and [D16.biodiv_marine_daily] How about add my variables into thest two groups?

Wan-Ling

[JamieDWilson]

Commenting on the biological carbon sink opportunity:

I'm happy with the merge in the shared spreadsheet across core physical, core bgc, and marine carbon pump so far.

The main rationale for the epc1000 and epcalc1000 variables as a global field (single level) is that they are lower volume outputs that provide additional unique information alongside the existing 100m equivalents. The 3D fields (expo and expcalc) allow for the same analysis w.r.t. the objective's science goals (actually better because fluxes across the whole water column are resolved) and are in the core bgc list currently. I'm not clear on the approach here - should the 3D fields be prioritised as the core output (many models didn't provide this output in cmip6) over the 2D fields, or, should the 2D fields remain?

Jamie