# About the spatial distribution of COMBINE\_SA\_ACON file **URL:** \ **Category:** CMAQ\ **Tags:** cmaq\ **Created:** [July 31, 2023, 8:41am UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278 "2023-07-31T08:41:11Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![lotso](https://avatars.discourse-cdn.com/v4/letter/l/94ad74/32.png) [@lotso](https://forum.cmascenter.org/u/lotso)\ **Post date:** [July 31, 2023, 8:41am UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/1 "2023-07-31T08:41:11Z")
I used two versions of the ISAM module CMAQv5.4 and CMAQv5.3.2, respectively.The parameter settings are the same for both versions, but the spatial distribution of some labeled areas in the combine file is quite different, while others differ less.The following two images are the spatial distribution of different areas in the comebine file. For example, the distribution of O3\_SH in 5.4 is quite different from that in 5.3.2, while the distribution of O3\_CZ in 5.4 and 5.3.2 is similar. （All images are from screenshots of Verdi） I wonder why this is, is it a problem with some parameter settings? How do I go about solving this problem?Thank you all for your help！ ![微信图片_20230731163126](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/4/43a81581fbed728a8fb698ceaff95da27aefb033.png) ![微信图片_20230731163331](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/c/c21af6148c04f5fde52c13cfc8570e9f17e53adc.png) ---
**Author:** ![Ben\_Murphy](https://avatars.discourse-cdn.com/v4/letter/b/74df32/32.png) [@Ben\_Murphy](https://forum.cmascenter.org/u/Ben_Murphy)\ **Post date:** [July 31, 2023, 4:51pm UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/2 "2023-07-31T16:51:00Z")
Hello, It looks like the color scales are very different for the maps of O3\_SH between the model versions. You may want to check that the emissions for the Shanghai region are being read properly. Are the bulk concentrations similar between the two model versions? -Ben ---
**Author:** ![hogrefe.christian](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@hogrefe.christian](https://forum.cmascenter.org/u/hogrefe.christian)\ **Post date:** [July 31, 2023, 5:14pm UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/3 "2023-07-31T17:14:40Z")
Which ISAM\_O3\_WEIGHTS option are you setting in your CMAQv5.4 runs? Unless you are setting it to “1”, some differences in ISAM spatial patterns relative to the CMAQv5.3.3 approach are expected, quite aside from the effects of other science updates in CMAQv5.4 on bulk concentrations (and therefore ISAM ). For further details on the ISAM\_O3\_WEIGHTS option in CMAQv5.4, please also see the recent paper by [Shu et al](https://gmd.copernicus.org/articles/16/2303/2023/). That said, I would expect the type of differences shown for O3\_CZ in your second row of plots, but not the differences shown for O3\_SH the first row of plots, especially given the different color scale noted by @Ben_Murphy in addition to the very different spatial patterns you pointed out. Since your plots show results after an additional step of post-processing (running COMBINE), have you confirmed that the same type of inconsistency exists for O3\_SH in the raw SA\_ACONC files? Is O3\_SH the only tag for which you see very different spatial patterns? ---
**Author:** ![lotso](https://avatars.discourse-cdn.com/v4/letter/l/94ad74/32.png) [@lotso](https://forum.cmascenter.org/u/lotso)\ **Post date:** [August 17, 2023, 8:26am UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/4 "2023-08-17T08:26:59Z")
Thanks for your reply.I also checked the results further. 1. ISAM\_O3\_WEIGHTS option is the default of 5. 2.I checked the ACONC file on the same day (2022.6.6) and adjusted the color maps to be consistent, but there was still a big difference in spatial distribution. ![image](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/6/6df6c4e31e74880393ad42c111d13d176241ad02.png) 3.I also checked the SA\_ACONC file on the same day (2022.6.6). The following GIF is the spatial distribution of the O3\_SH on this day. (The concentration results of v532 and v54 are quite different, so this color map are not the same.) In contrast, it feels that the results of v532 are more reasonable. At least it began to spread outward from Shanghai. ![test0606_O3_SH](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/f/f5ac13b522cdfefc86328eb7e8d55c39e582bc7d.gif) ![test0606_O3_SH_v54](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/c/c1b9cab98322403f912ddfae622bfeccf24e0e3b.gif) 4.The O3\_SH is not the only tag with differernt spatial distribution, and the spatial distribution of many tags is also strange. ---
**Author:** ![Ben\_Murphy](https://avatars.discourse-cdn.com/v4/letter/b/74df32/32.png) [@Ben\_Murphy](https://forum.cmascenter.org/u/Ben_Murphy)\ **Post date:** [August 17, 2023, 1:47pm UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/5 "2023-08-17T13:47:32Z")
Hello, Thank you for posting these additional results. They are very helpful. The differences in the bulk Ozone concentration between the v5.3.2 and v5.4 ACONC files is notable. It would be a good idea to focus on why those are so different first, and then move on to ISAM predictions. Could you please send your RunScripts and an example CTM\_LOG file from each simulation so that we can confirm there are no issues reading emissions in the v5.4 simulation? After that, we can look at the ISAM control file to see if there are issues there. Best wishes, Ben ---
**Author:** ![lotso](https://avatars.discourse-cdn.com/v4/letter/l/94ad74/32.png) [@lotso](https://forum.cmascenter.org/u/lotso)\ **Post date:** [August 20, 2023, 1:55pm UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/6 "2023-08-20T13:55:35Z")
Hello When I ran ISAM for v5.4, the ICON and BCON files were both generated as a result of v5.3.2. Will this have a big impact on the results? From the perspective of time series, v5.4 is also significantly low. Here ate the script and CTM\_LOG files I ran, please see where the problem is. Thanks a lot! ![image](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/e/e3a1b16133485fb77ef9b9b18ca64471d3b2b617.png) [run\_cctm\_cn04\_2206\_O3\_SA.csh](https://forum.cmascenter.org/uploads/short-url/wKxnXXA0b7umTvI3XSXI1DjahUx.csh) (40.7 KB) [CTM\_LOG\_000.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/pbDUrdA6b5f3MbJoz8F3xh7XS7X.txt) (603.6 KB) [CTM\_LOG\_001.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/cM7KQu5cNDT5OmvHccMCi7R3FYv.txt) (589.0 KB) [CTM\_LOG\_002.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/xVCv2XGU6nEgPtpPku0vgGA6dYm.txt) (847.7 KB) [CTM\_LOG\_003.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/yQuV5HbsKElklojLkDDvZxakjjr.txt) (718.3 KB) [CTM\_LOG\_004.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/79rxhfXzm38pJWWfyMEDffF05Ho.txt) (718.3 KB) [CTM\_LOG\_005.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/9P62tlggM2IPt6yYnui9ummdzfq.txt) (718.3 KB) [CTM\_LOG\_006.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/zIvdeI0Z4duVrVJ6IZerRBvwv42.txt) (589.0 KB) [CTM\_LOG\_007.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/2QHJ0a1BFQ7nMB8l6k3313bHkZb.txt) (589.0 KB) [CTM\_LOG\_008.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/xZSCWWdC3bizQ8S9ZRf2pHwapdX.txt) (718.3 KB) [CTM\_LOG\_009.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/srLsunruIyAUf8RMhM31Ysprim8.txt) (640.6 KB) [CTM\_LOG\_010.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/9jIGYXBnRlxS61WCBhhanxEwV5O.txt) (1.8 MB) [CTM\_LOG\_011.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/gCxBLoxtMDvN9SbAk0lKNMu0tQl.txt) (1.9 MB) [CTM\_LOG\_012.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/xh8lORcOCW0y5mevz2hdRQ1NgZN.txt) (1.8 MB) [CTM\_LOG\_013.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/etoGesCxvTiw6qjeP3ysG2v05k2.txt) (1.8 MB) [CTM\_LOG\_014.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/1tz7On88hIWCx9jtFVjGcukVw1V.txt) (1.9 MB) [CTM\_LOG\_015.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/vqNxhuhAVpHnXfb6wPKU8CXf2RO.txt) (589.0 KB) [CTM\_LOG\_016.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/zPHrUGKV5oa8kjaAb6USOaBo2Qh.txt) (718.3 KB) [CTM\_LOG\_017.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/wmnGHtisPi0HQIMivyifxLbHpew.txt) (511.3 KB) [CTM\_LOG\_018.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/9DgCAyvln996dHF2nWLfwPz3Ilr.txt) (1.6 MB) [CTM\_LOG\_019.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/iEqZ3bZvp5TpzVvICqmtGKou1Yy.txt) (1.9 MB) [CTM\_LOG\_020.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/6GqqlZNNnn7pKjyXR7pJF7Epr1R.txt) (1.9 MB) [CTM\_LOG\_021.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/1YJXWZGfKp51I7wUqcgVvl7Iv7w.txt) (1.9 MB) [CTM\_LOG\_022.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/1xslXTgB39v8tK2kUlC6mdYc4LZ.txt) (2.0 MB) [CTM\_LOG\_023.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/3rgdr4iAEwgQVrbpn8RefsWjqRI.txt) (1.3 MB) [CTM\_LOG\_024.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/yH1hKyRMVscuZPljKJ2dKNNsWTx.txt) (718.3 KB) [CTM\_LOG\_025.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/y26Ar9UiSjapDr8CgO1Mn5D31rJ.txt) (511.3 KB) [CTM\_LOG\_026.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/focjQmlipF57MUgjp29iEESxidN.txt) (1.6 MB) [CTM\_LOG\_027.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/dVzj5POKNFbPL8DVkFR4SOlPTIF.txt) (1.9 MB) [CTM\_LOG\_028.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/cOSvObo1ouEgIGDxTK5Uphb2VEr.txt) (2.0 MB) [CTM\_LOG\_029.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/a68wVxYtutgS5CpUxtfLrUMI5GH.txt) (2.0 MB) [CTM\_LOG\_030.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/kIqisgDOd7DBkHcBPuenxKIW94T.txt) (1.9 MB) [CTM\_LOG\_031.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/nZpGEmYHbomagKjidXlOPc1PV0X.txt) (589.0 KB) [CTM\_LOG\_032.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/q8atqZOAbnX0q5WNUdYcszCDdoW.txt) (589.0 KB) [CTM\_LOG\_033.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/nrtnhA2TXbj5PuessMwLDc4o6C8.txt) (511.3 KB) [CTM\_LOG\_034.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/9BMnhnV6Z5AtxH3kJWERvq9mpDX.txt) (1.6 MB) [CTM\_LOG\_035.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/1p06v3pEKEJqQbScSbTewAvmLnf.txt) (1.8 MB) [CTM\_LOG\_036.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/6hSrS8CTA0g7TnbsPhhF4SvcHhF.txt) (1.9 MB) [CTM\_LOG\_037.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/3ZmApc2X9PPr2OpqyCeIs6VP26R.txt) (1.9 MB) [CTM\_LOG\_038.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/4JuqKB7YoS8w9J2SoH2Gf9JLrx7.txt) (511.3 KB) [CTM\_LOG\_039.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/t0aneLWfslnaQmchyCxdrHBZCaP.txt) (589.0 KB) [CTM\_LOG\_040.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/diySZovy8lb0PjRShaZQdVryf3J.txt) (589.0 KB) [CTM\_LOG\_041.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/3ToTSye5lsYB95tFIlLSUalUnu4.txt) (2.0 MB) [CTM\_LOG\_042.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/6sOaVKoO2lui3ST8oooY9qVMn6b.txt) (1.8 MB) [CTM\_LOG\_043.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/tYJUauLWSDtE5Nhs1Gs6xpMMRe.txt) (589.0 KB) [CTM\_LOG\_044.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/aMTgd8FUKhAgOSpdPZkO4TU1VZR.txt) (589.0 KB) [CTM\_LOG\_045.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/pYutzFJdDYpuv4w6idUaxYA5xOs.txt) (589.0 KB) [CTM\_LOG\_046.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/fIEcTD89dbAW1kfEuYl31zY0vkV.txt) (589.0 KB) [CTM\_LOG\_047.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/lS4C1pCxDvCHKkLdc7XZbQe8dU8.txt) (589.0 KB) ---
**Author:** ![hogrefe.christian](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@hogrefe.christian](https://forum.cmascenter.org/u/hogrefe.christian)\ **Post date:** [August 24, 2023, 8:38pm UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/7 "2023-08-24T20:38:42Z")
Thank you. Could you please also post the run script and log file (the CTM\_LOG\_000 one is sufficient) for your CMAQv5.3 simulation? ---
**Author:** ![lotso](https://avatars.discourse-cdn.com/v4/letter/l/94ad74/32.png) [@lotso](https://forum.cmascenter.org/u/lotso)\ **Post date:** [August 29, 2023, 6:53am UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/8 "2023-08-29T06:53:06Z")
I have uploaded the script and LOG files a few days ago, is it that I did not upload successfully, can not view? [run\_cctm\_cn04\_2206\_O3\_SA.csh](https://forum.cmascenter.org/uploads/short-url/wKxnXXA0b7umTvI3XSXI1DjahUx.csh) (40.7 KB) [CTM\_LOG\_000.v54\_ISAM\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/pbDUrdA6b5f3MbJoz8F3xh7XS7X.txt) (603.6 KB) ---
**Author:** ![hogrefe.christian](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@hogrefe.christian](https://forum.cmascenter.org/u/hogrefe.christian)\ **Post date:** [August 29, 2023, 11:38am UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/9 "2023-08-29T11:38:45Z")
I see the uploaded run script and log file for your CMAQv5.4 simulation, but not the corresponding files for your CMAQv5.3.2 simulation. For us to help diagnose the issue further, could you please upload the files from both the CMAQv5.4 and CMAQv5.3.2 simulations? ---
**Author:** ![lotso](https://avatars.discourse-cdn.com/v4/letter/l/94ad74/32.png) [@lotso](https://forum.cmascenter.org/u/lotso)\ **Post date:** [August 29, 2023, 2:07pm UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/10 "2023-08-29T14:07:48Z")
Here are the script and CTM\_LOG\_000 file for CMAQv5.3.2. [run\_cctm\_ISAM\_O3\_202206\_CZ\_REGION\_0.5NOX\_5VOC.csh](https://forum.cmascenter.org/uploads/short-url/7uwhkvOuoWfIZjpyRy1VeifN1Us.csh) (36.8 KB) [CTM\_LOG\_000.v532\_intel\_cn04\_20220525.txt](https://forum.cmascenter.org/uploads/short-url/4PCJ20kqA8KzlgMdTjxIhmrzgfj.txt) (925.8 KB) ---
**Author:** ![hogrefe.christian](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@hogrefe.christian](https://forum.cmascenter.org/u/hogrefe.christian)\ **Post date:** [August 29, 2023, 2:26pm UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/11 "2023-08-29T14:26:54Z")
Thank you. Could you please also upload the two isam\_control files, i.e. /data5/projects/Changzhou/CMAQ/CCTM/script/ISAM/O3/REGION/isam\_control\_cn04\_CZ.txt from run\_cctm\_ISAM\_O3\_202206\_CZ\_REGION\_0.5NOX\_5VOC.csh|attachment and ${WORKDIR}/isam\_control\_O3\_REGION.txt from run\_cctm\_cn04\_2206\_O3\_SA.csh ---
**Author:** ![lotso](https://avatars.discourse-cdn.com/v4/letter/l/94ad74/32.png) [@lotso](https://forum.cmascenter.org/u/lotso)\ **Post date:** [August 30, 2023, 2:52am UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/12 "2023-08-30T02:52:14Z")
CMAQv5.3.2 [isam\_control\_cn04\_CZ\_v532.txt](https://forum.cmascenter.org/uploads/short-url/qzyCqMbi28KAmgDMTY9cpWdhvqF.txt) (3.5 KB) CMAQv5.4 [isam\_control\_O3\_REGION\_v54.txt](https://forum.cmascenter.org/uploads/short-url/n1hUcyudQiP2TFAjvyvSKhGjL1e.txt) (4.1 KB) ---
**Author:** ![hogrefe.christian](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@hogrefe.christian](https://forum.cmascenter.org/u/hogrefe.christian)\ **Post date:** [August 30, 2023, 7:44pm UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/13 "2023-08-30T19:44:56Z")
Thank you for posting this additional information I’ll admit that I’m a bit stumped here. The only difference I see in the DESID mapping portion of the log files is that in your v5.3.2 your emitted species XYL was mapped to the mechanism species XYLMN while in your v5.4 runs it was dropped altogether. Regardless of whether this is intentional behavior or not, I wouldn’t expect this to cause the type of differences you’re seeing, so I’ll have to defer to others to see if they have any additional suggestions on what might be happening. ---
**Author:** ![Ryan](https://avatars.discourse-cdn.com/v4/letter/r/a8b319/32.png) [@Ryan](https://forum.cmascenter.org/u/Ryan)\ **Post date:** [August 31, 2023, 5:35am UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/14 "2023-08-31T05:35:50Z")
I would like to provide several suggestions as I also run some CMAQ cases over China with a number of CMAQ versions. 1. Firstly, consider to generate icon and bcon files using csh files under CMAQv5.4 to avoid any minor issues. 2. Secondly, I would question on biogenic emission used in these CMAQ runs. Are you using offline BVOC emissions calculated from MEGANv2.1 in both simulations? I would expect considerable ozone underestimation in CMAQ5.4 case if you are using the inline module of MEGAN3 in CMAQv5.4. 3. Last suggestion is that you can activate the IPR in both cases to see if any major changes in critical physical/chemical processes. Also, checking emission files and chemical mechanism used in modeling is warranted. I concur with Christian that there is not sufficient details shown in LOG files, thus additional investigations is needed. Hope it helps. ---
**Author:** ![Bruteleenandrane](https://avatars.discourse-cdn.com/v4/letter/b/9d8465/32.png) [@Bruteleenandrane](https://forum.cmascenter.org/u/Bruteleenandrane)\ **Post date:** [September 2, 2023, 1:13am UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/15 "2023-09-02T01:13:55Z")
Thank you for posting these additional results. They are very helpful. ---
**Author:** ![jinefune](https://avatars.discourse-cdn.com/v4/letter/j/48db29/32.png) [@jinefune](https://forum.cmascenter.org/u/jinefune)\ **Post date:** [September 11, 2023, 6:53pm UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/16 "2023-09-11T18:53:01Z")
Thank you for posting these additional results. They are very helpful. ---
**Author:** ![jinefune](https://avatars.discourse-cdn.com/v4/letter/j/48db29/32.png) [@jinefune](https://forum.cmascenter.org/u/jinefune)\ **Post date:** [November 15, 2023, 9:01am UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/17 "2023-11-15T09:01:48Z")
Thanks a lot! [.](https://krnl.fun/)[.](https://hdstreamz.uno) ---
**Author:** ![lizadams](https://avatars.discourse-cdn.com/v4/letter/l/49beb7/32.png) [@lizadams](https://forum.cmascenter.org/u/lizadams)\ **Post date:** [November 17, 2023, 8:38pm UTC](https://forum.cmascenter.org/t/about-the-spatial-distribution-of-combine-sa-acon-file/4278/18 "2023-11-17T20:38:00Z")