aerosol_guide.txt

AEROSOL CHARACTERIZATION GUIDE 

Illumina allows to create 2 different layers of aerosols with different properties: compositions, scale height, AOD and angstrom coefficient.

The aerosol types that Illumina includes are extracted from OPAC data (Hess, Koepke and Schult 1998. See http://cds-espri.ipsl.fr/etherTypo/?id=989&fbclid=IwAR0Ome7uT9JDK3OlfgwV3Psyja4BZIxedNtojLT1-twEgc23SOEZ1bUKSac).

Aerosol types:

- Insoluble
- Water soluble
- Soot
- Sea salt (acc.mode)
- Sea salt (coa. mode)
- Mineral (nuc. mode)
- Mineral (acc. mode)
- Mineral (coa. mode)
- Mineral-transported
- Sulfate droplets
- Fog

Illumina allows the user to combine any component using their Particle density (particules/cm³). Moreover, there are some typical combination that are already defined:

- Continental clean (CC)
	total         2600
	water soluble 2600
	insoluble     0.15
- Continental average (CA)
	total         15300
	water soluble 7000
	insoluble     0.4
	soot          8300
- Continental polluted (CP)
	total	      50000
	water soluble 15700
	insoluble     0.6
	soot          34300
- Urban (U) 
	total	      158000
	water soluble 28000
	insoluble     1.5
	soot          130000
- Desert (D)
	total	      2300
	water soluble 2000
	mineral nuc   269.5   
	mineral acc   30.5
	mineral coa   0.142
- Maritime clean (MC)
	total         1520
	water soluble 1500
	see salt acc  20
	see salt coa  3.2*10^(-3)
- Maritime polluted (MP)
	total         9000
	water soluble 3800
	see salt acc  20
	see salt coa  3.2*10^(-3)
	soot          5180
- Maritime tropical (MT)
	total         600
	water soluble 590
	see salt acc  10
	see salt coa  1.3*10^(-3)
- Artic (ART)
	total	      6600
	water soluble 1300
	see salt acc  1.9
	soot          5900
- Antarctic (ANT)
	total         43
	sulfate       42.9
	see salt acc  0.047
	mineral trans 0.0053

The aerosol components are mixed in order to obtain the resulting Single Scatering albedo and Scatering Phase Function. The equations used are the following:

(1)			SSA = SUM(N_i*scat_coef_i)/SUM(N_i*ext_coef_i)

(2)			PF(angle) = SUM(N_i*PF_i(angle)) (normalized)