Mod4U is a parameter input software specifically developed for Modtran, which simplifies the parameter input process of Modtran. Modtran is a program used to improve the spectral resolution of LOWTRAN by developing algorithms for 2cm-1 spectral resolution and updating the treatment of molecular absorption.
This manual introduces Mod4U, a tool that simplifies the input of MODTRAN parameters. It describes the purpose of the software, the structure of the card decks, and how to configure atmospheric and surface settings.
The document details each card (e.g., CARD 1, CARD 1A, CARD 2), the available options such as SPEED, MODEL, ITYPE, and how to run simulations, view results, and generate output files like tape6‑tape8. This manual is written in Chinese.
| CO2 mixing ratio default | 330 ppmv |
|---|---|
| DISORT streams recommendation | 8 streams |
| Surface albedo codes (SALB) | -1 = new snow |
Set the CO2MX parameter; the default value is 330 ppmv.
SALB -1 corresponds to a new‑snow surface albedo.