Table of contents
背景
- 揚沙是WRF-chem最單純的個案，不需任何的排放量數據，由模式按照公式採線上計算產生排放量。
- namelist.input中有關&chem的設定，可以參考tutorial
- 網路公開之手冊目前只到3.9版，4版仍在撰寫中。NOAA認為版本間差異不大，鼓勵使用者先參閱Release Note。
&chem之設定
- 共有39項參數，揚沙只需打開下列15項，與tutorial有差異者討論如下
emiss_opt排放機制選項：範例採emiss_opt = 3,會讀取radm2/MADE/SORGAM人為排放量，應無法執行。改為emiss_opt = 0,conv_tr_wetscav範例採0，沒有次網格洗滌，這應該會造成高估，也非內設作法，是偵錯過程。此值改為內設值1。aer_ra_feedback範例也採0。等於粒狀物不影響輻射、溫度、乃至於風場，應為偵錯用途。改為內設值1。
| Option | Description | Value | Meaning |
|---|
| kemit | number of vertical levels in the emissions input data file. | 1 | windblown dust from surface |
| emiss_opt | emission scheme | 0 | no external emission |
| chem_opt | chemical mechanism | 401 | Dust concentration only, Simple ash treatment with 10 ash size bins |
| chemdt | time step used by chemistry in minutes | 10 | small enough relative to model dt 180 min |
| aer_drydep_opt | dry depos. of part. | 1 | action |
| dust_opt | dust emiss | 1 | include GOCART dust emissions - need to provide fractional erosion map data |
| gas_bc_opt | gas boundary profile | 1 | uses default |
| gas_ic_opt | gas initial profile | 1 | uses default |
| aer_bc_opt | aer boundary profile | 1 | uses default |
| aer_ic_opt | aer initial profile | 1 | uses default |
| wetscav_onoff | turn on the wet scavenging | 0 | off |
| cldchem_onoff | turn on the cloud chemistry | 0 | off |
| have_bcs_chem | gets lateral boundary data from wrfbdy data file | .false. | use profile |
| aer_ra_feedback | no feedback from the aerosols to the radiation schemes | 1 | feedback |
| aer_op_opt | aerosol optical properties scheme | 0 | based upon volume approximation |
Reference
- NOAA, WRF-Chem Version 3.9.1.1 User’s Guide, NOAA