Questions about release version and status report

[SebastiaanHazelhorst]

Hi EMEP modellers

I have downloaded the EMEP status report for 2021 in order to learn about the model developments of EMEP MSC-W (https://emep.int/publ/reports/2021/EMEP_Status_Report_1_2021.pdf). When reading chapter 5, some questions popped up. Could you help to clarify on the following issues? Thanks in advance!

1. On p.109, it is said that version 4.42 is used for reporting, whereas on github, version 4.45 has just been published. How come these versions are different? And if so, where can I find the changes in 4.45 compared to 4.42?
2. In chapter 5.2.1 (p.110), it is stated that GNFR_CAMS sectors were used in stead of the 11 SNAP sectors. In the previous status report of 2020, it was also stated that the GNFR_CAMS sector system was used (p.156 in https://emep.int/publ/reports/2020/EMEP_Status_Report_1_2020.pdf). I am a bit confused on what has changed compared to the previous version.

Kind regards, Sebastiaan

[mifads]

Hi Sebastiaan, cc @gitpeterwind @avaldebe @svetlanat @agnesny

1. The model results did not change very much from rv4.42 to 4.45, but there were very many small changes:

• Many new output possibilities associated with maximum daily eight-hour mean were introduced, e.g. monthly averages, 1st, 2nd, 3rd and/or 4th higherest (99% highest over 1 year is between third and fourth), also 26th highest Max8D fullrun value. (gives approximately the 93% percentile highest value). For EU target value "120 µg/m 3 not to be exceeded on more than 25 days per calendar year averaged over three years".
• Switched to usage of v2.3 of cams81 soil NOx emissions (from v2.2)
• The 2 meter relative humidity from wrf had wrong units. Now converted from kg(H2O)/kg(air) into relative to saturation.
• Changed MMD of sea-salt from 4.8um to 4.0um
• Bug-fix for soil water usage in EMEP-DO3SE
• Wet radius now used in settling velocity for coarse PM
• Changes to update POD calculations to 2017 Mapping Manual (MM), including special treatment for IAM_SNL_MOD, including using of new Mediterranean mask-file, and use of topography on growing season calculations.
• EmisDef_mod: timefactor and height release for GNFR_D changed from 4 to 5 (=SNAP indices for "Production processes").
• Many improvements in the Local Fraction system, including improved PM, preliminary O3,
• Gridded hourly timefactors introduced (3/6/2021)
• Very much faster reading of netcdf emission files in new format
• Improved restart options
• Very many changes to improve code efficiency and memory usage.

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2. The last runs certainly used the 19-sector GNFR_CAMS system. I will have to leave it to @agnesny or others to explain the report text.

[agnesny]

Hi Sebastian,

We do not use SNAP sectors in the reporting runs anymore. All EMEP emissions have been provided by the emission centre (CEIP) in the GNFR sector system since 2017, if I remember the year correct. Well at least for several years by now.

The so-called GNFR_CAMS sectors system (19 sectors) was developed based on the GNFR sectors. The GNFR_CAMS sectors are listed below, and here I will give a short summary of the history behind.

The GNFR sector system has in principle 13 sectors (sec01-sec13). The EMEP emissions follow this. However, we often work with CAMS emission data provided by TNO, and they have 'extended' the GNFR sector system by splitting the road traffic sector (sec06 = "F_RoadTransport") into sub sectors (F1-F4) as described below in sec16-sec19. So we added these sub-sectors to our GNFR sectors. Also, in the CAMS emission data there is additional information about whether the emission source is area or point type. This distinction exist also for the 'A_PublicPower' sector. After discussions with TNO about how we should interpret and treat these area type of public power sources (we normally assume that power plants are point sources and put the emissions into higher levels), we concluded that area and point type of public power should be placed into two separate sub-sectors, so that we can use different release heights for them. These are in sec14-sec15.

So, when we use EMEP emissions, where there are no sub-sectors for A and F, we actually have only 13 sectors. When we use CAMS emissions, we have all 19 sectors in the emission data input, but sec1 and sec6 is 'empty', since emissions from these sectors are placed into sec14-sec19 instead.

:sec01 = "A_PublicPower" ; :sec02 = "B_Industry" ; :sec03 = "C_OtherStationaryComb" ; :sec04 = "D_Fugitive" ; :sec05 = "E_Solvents" ; :sec06 = "F_RoadTransport" ; :sec07 = "G_Shipping" ; :sec08 = "H_Aviation" ; :sec09 = "I_Offroad" ; :sec10 = "J_Waste" ; :sec11 = "K_AgriLivestock" ; :sec12 = "L_AgriOther" ; :sec13 = "M_Other" ; :sec14 = "A1_PublicPower_Point" ; :sec15 = "A2_PublicPower_Area" ; :sec16 = "F1_RoadTransportExhaustGasoline" ; :sec17 = "F2_RoadTransportExhaustDiesel" ; :sec18 = "F3_RoadTransportExhaustLPGgas" ; :sec19 = "F4_RoadTransportNonExhaust" ;

I hope this helped.

Best wishes, Agnes

[SebastiaanHazelhorst]

Hi Agnes and mifads,

Thanks for your response.

Good to know that there are no major changes between rv4.42 and rv4.45.

Agnes, if I understand it correctly, in both EMEP status report of 2020 and 2021, the 19-sector GNFR system has been used. So, there have not been any changes in sector system between both reports.

Kind regards, Sebastiaan

[agnesny]

Hi Sebastian,

Correct. The same GNFR (GNFR_CAMS) sector system was used in both status reports.

Bests, Agnes

[mifads]

Closing. Just re-open if anything of the above is unclear.