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--- emep:page1:pm_underestimation [2011-08-24 13:09:38]
hildef
+++ emep:page1:pm_underestimation [2022-05-31 09:29:32] (current)
@@ Line 2: / Line 2: @@
 Participants:
-DS,ST,DS,JEJ,BMS,ACB,MG,HF,PW
+DS,ST,JEJ,BMS,ACB,MG,HF,PW,MS
 Possible reasons:
  * pH dependency of SO2 ox rate \\
  * wet scavenging (in ice, scavenging rates ...)\\
- * emission heights (probably not important)\\
+ * emission heights:\\
- * Size of vertical layers\\
+DS:I have started this, testing different plume-rise
- * BIC for aerosols\\
+formula together with the IIASA . Peter contributed with a subroutine to
- * Wood burning emissions\\
+spread the emissions into flexible vertical layers also. Should all be
+ready soon-ish, but probably won't change things very much as you say. (probably not important)\\
+ * Size of vertical layers, boundary layer mixing \\
+ * Secondary Organic Aerosol contribution\\
+ * Agricultural and Industrial dust in windy, dry conditions \\
+ * BIC for aerosols, dust in southern Europe\\
+ * Wood burning emissions underestimated:Robert is doing  a lot with Hugo as we speak, but the problem is with the "official" emissions. We can't change them, even
+when we know they are wrong. \\
+We could change the time-series though, using a "degree-day" approach as
+Betrand used. That would be good, but requires some testing. I think
+that SNAP-2 in general should have this, and wood-burning especially,
+but I also suspect that wood-burning starts at a lower temperature than
+Betrand's 20C degree days. \\
+* Station representativity for some specific sites (Susceptibility to inversion situations in winter?)\\
+* Kz, Hmix - currently our minimum mixing height is in the 2nd layer
+(k=19). I have some test versions which allow very shallow mixing
+heights. These cause a slight increase in surface PM, and are
+scientifically ok I think. I can commit next week if all looks well. \\
+(What I am less sure about is what we should do for Kz above Hmix. Now
+we have zero, earlier we used critical Richardson numbers, etc. Seems
+better to use the latter.) \\
+* I suggested some ideas for David H. here to work with, but that seems
+to be progressing slowly. I'll check again on this next week. \\
+* Ammonium nitrate formation \\
+* Emission seasonality for SO2 missing\\
+Which Analysis :
+* Separate discussion by aerosol component\\
+* AMS measurements EUSAAR ?\\
+* Caliop extinction profiles for European subregions become available shortly, extinction profile in model needed, \\
+* EUCAARI aircraft measurements?\\
+* Seasonal and spatial bias analysis \\
+** When do we underestimate?? It would be good to use time to figure out
+if we can see patterns in the days when we underestimate compared to
+when we don't. Is it on very cold days, or generally for example?  Which
+compounds cause most of the problem? Might give a clue on whether it is
+meteorology of chemistry. \\
+===== Minutes =====
+ * [[emep:page2:Minutes|Minutes 26.08.2011]]