1 | Specifies all physico-chemical properties for the species. |
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2 | |
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3 | To generate an overview table compile the specoverview.f90 program |
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4 | |
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5 | gfortran specoverview.f90 -o specoverview |
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6 | ./specoverview |
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7 | |
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8 | UPDATE FOR FLEXPART VERSION 10.3: |
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9 | --------------------------------------------------------------------------------------------------------------------------- |
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10 | Please note that the format of the SPECIES files has changed from the previous version (9.2) of FLEXPART and it is important |
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11 | to update all SPECIES files accordingly. The use of SPECIES files from older FLEXPART versions may lead to run-time |
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12 | errors or erroneous results. |
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13 | --------------------------------------------------------------------------------------------------------------------------- |
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14 | Half life due to radioactive or chemical decay and can be switched off by specifying a negative value. |
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15 | Molecular weight (molweight of the species, needed for mixing ratio output) |
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16 | --------------------------------------------------------------------------------------------------------------------------- |
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17 | WET DEPOSITION |
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18 | |
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19 | Below-cloud scavenging |
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20 | - Gases: |
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21 | A and B are the parameters for below-cloud scavenging defined by Eq. scavenging coefficient = A x precipitation-rate^B |
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22 | If you migrate from FLEXPART version 9.2 and below this is equal to A and B as it was. |
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23 | - Particles: |
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24 | A "rain collection efficiency" |
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25 | B "snow collection efficiency" are both defined by Equations 46-47. |
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26 | Suggested values for particle scavenging are A=1.0,B=1.0. |
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27 | Using values A=0.2 and B=0.2 will give results close to the old scavenging scheme of FLEXPART version 9.2 and below. |
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28 | |
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29 | In-cloud scavenging |
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30 | - Gases: |
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31 | Is switched on if Ai or Bi are given greater than 0 |
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32 | If you migrate from FLEXPART version 9.2 and below this is equal to Ai and Bi should be set to 1 |
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33 | - Particles: |
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34 | Ai ("Cloud Condensation Nuclei (CCN) efficiency") |
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35 | Bi ("Ice Nuclei (IN) efficiency") are both from Eq. 51. |
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36 | Suggested values for particle scavenging are Ai=0.9 and Bi=0.1. |
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37 | Using values Ai=0.9 and Bi=0.9 should give results cto the old scavenging scheme of FLEXPART version 9.2 and below. |
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38 | --------------------------------------------------------------------------------------------------------------------------- |
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39 | DRY DEPOSITION |
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40 | - Gases: |
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41 | D is the diffusivity of water vapor and |
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42 | D_i is the diffusivity of the species, |
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43 | H is the effective Henry's constant, |
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44 | f0 varies between 0 and 1 and gives the reactivity of a species relative to that of ozone. For non-reactive species f0 is 0, for slightly reactive it is 0.1 and for highly reactive it is 1. |
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45 | Dry deposition of gases is switched off by negative D. |
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46 | - Particles: |
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47 | rho specifies the density of the substance, |
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48 | dquer its mean diameter |
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49 | dsig the measure of variation. |
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50 | If no detailed information for deposition velocity calculation is available, a constant deposition velocity vd [cm s-1] can be used. |
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51 | Dry deposition of particles is switched off by negative rho. |
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52 | --------------------------------------------------------------------------------------------------------------------------- |
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53 | OH REACTION: |
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54 | can be turned on by giving parameter C [cm^3/molecule/sec]], D [K] and N [no unit] positive values, defined by Eq. 39. |
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55 | OH reaction is switched off by negative C. |
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56 | --------------------------------------------------------------------------------------------------------------------------- |
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57 | Optionally emission variation information |
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58 | can be added at the end of the file, defined as following: Since FLEXPART version 6.0, emission factors can be defined that change the temporal variation of particle releases. This is useful, for instance, |
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59 | to simulate the typical daily and weekly cycle of anthropogenic emissions. The emission factors are given in the file of the |
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60 | corresponding species SPECIES_nnn, where nnn is the species number defined in file RELEASES. If no emission variation |
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61 | information is given, emission rates for species nnn are taken as constant. Release rates can vary with the hour of the day |
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62 | and with the day of the week, according to the local time at the release location. Emission factors must be 1 on average. 24 |
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63 | hourly as well as 7 daily values must be specified. Furthermore, different disaggregation factors must be given for area sources |
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64 | and for point sources. FLEXPART distinguishes between the two using the lower altitude of the release box: area sources are |
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65 | assumed to start below 0.5 m above the ground, whereas point sources are assumed to be higher. Please note that when this |
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66 | option is used, it is not so easy to determine the maximum number of particles present at a particular time of the model run. It |
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67 | might then be necessary to increase the parameter maxpart to a higher value than what would otherwise be needed. |
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