📄 afgl1986

This repository provides an electronic version of tables 1 and 2 of the AFGL report AFGL-TR-86-0110 (Environmental Research Papers, No. 954) entitled AFGL Atmospheric Constituent Profiles (0-120km) by G.P Anderson, S.A. Clough, F.X. Kneizys, J.H. Chetwynd and E.P. Shettle (published in 1986).

Structure

The AFGL (1986) report divides its tables 1 and 2 into several sub-tables, i.e., tables 1a-f (6 tables) and tables 2a-d (4 tables), respectively.

Table 1

Tables 1a-f correspond to the six reference model atmospheric profiles defined in the report:

Table	Model	Name
1a	1	Tropical
1b	2	Midlatitude Summer
1c	3	Midlatitude Winter
1d	4	Subarctic Summer
1e	5	Subarctic Winter
1f	6	U.S. Standard

The tabulated quantities are:

Quantity	Symbol	Units
Altitude	z	km
Pressure	p	mb
Temperature	t	K
Number density	n	cm^-3
Constituent mixing ratio		ppmv

The symbol used for the constituent mixing ratio is the chemical formula of the constituent, e.g., H2O for water wapor. Each table include the mixing ratios for H2O, O3, N2O, CO and CH4. All mixing ratio values are provided in ppmv (parts per million) units.

Table 2

Tables 2a-d provide the volume mixing ratios of 28 molecules, including H2O, O3, N2O, CO and CH4. These constituent profiles are compatible with model 6 (U.S. Standard), except for the CO2 and O2 profiles which are compatible with all models (1-6). The complete list of molecules included in table 2 is given here: H2O, CO2, O3, N2O, CO, CH4, O2, NO, SO2, NO2, NH3, HNO3, OH, HF, HCl, HBr, HI, ClO, OCS, H2CO, HOCl, N2, HCN, CH3Cl, H2O2, C2H2, C2H6 and PH3. These molecules match the 28 first molecules in the HITRAN database.

Format

The tables are provided in comma-separated values (CSV) files. There is one file per table. Each file has the same structure as the corresponding table of the AFGL (1986) report, i.e., first column is altitude, second column is pressure, and so on. Also, all values are given with the same number of significant digits as in the report tables, and use the same number notation (all in scientific notation except for the temperature and altitude).

Units

I do not provide the units of the tabulated quantities in the CSV files. The units are the same as those given in the AFGL report. They are indicated in the table above.

Use with Python

For example, read the table 1a into a pandas.DataFrame with:

import pandas as pd
df = pd.read_csv('tables/1a.csv')