Data · dataset · 2026
Evaluating a new deposition velocity module in the Noah land surface model
Listed in National Center for Atmospheric Research
The community Noah land-surface model (Noah LSM) has been modified to couple with a photosynthesis-transpiration scheme (GEM) to estimate the deposition velocity (V d) for air quality studies.
Description
This new capability of the Noah-GEM model was tested in a point version of the National Center for Atmospheric Research-High Resolution Land Data Assimilation System (HRLDAS). Ozone V d observations from June 1â30, 2002 over the AmeriFlux forested site located at Niwot Ridge, Colorado, USA (40°1'58"N;105°32'47"W) were used.
The model reasonably captures V d variations for both dry and wet conditions but has problems at nighttime. Experiments were performed to assess the sensitivity of V d calculations to surface characteristics related to vegetation and soil parameters. The results indicated that V d values are sensitive to accurate specifications of the leaf area index (LAI) and a lesser extent to vegetation type, maximum stomatal resistance (R smax) and soil texture prescription.
Read the rest (2 more)
The model sensitivity to canopy resistance was noted for both daytime and nighttime. For this forest site, neither soil textures nor soil moisture appeared to affect V d calculations significantly, though they affected the surface heat-flux estimation particularly under low soil moisture conditions. Therefore, the V d estimation in the Noah model can be enhanced by either site-specific LAI or assimilating regional normal difference vegetation index information for specific time periods.
Results also highlighted the need to lower the current constant R smax value used in Noah and other land-surface models.
Links
Get the data
- Publisher page n2t.org/ark:/85065/d78p61sh ↗
documentation · download · from data ucar edu
Where it is published
- data.ucar.edu /dataset/evaluating-a-new-deposition-velocity-module-in-the-noa… ↗
National Center for Atmospheric Research dataset page
landing page · from data ucar edu
Catalogue records · 1
- CKAN API data.ucar.edu/api/3/action/package_show?id=69a773a5-8642-4948-9431-3f826f9dd… ↗
metadata API · from data ucar edu
Topics
- From keywords
- Earth & Environmental Science · Ocean & Atmospheric Science
- Inferred from text
- Climate change science 70%
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| National Center for Atmospheric Research | 69a773a5-8642-4948-9431-3f826f9dde01 | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| concepts[field].anzsrc:group:3702 | enrichment · data ucar edu | taxonomy-embedding@1.1.0 | title+keywords+description (70%) |
| concepts[field].local:field:earth-environmental | mapping · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| created_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| description | source · data ucar edu | connector:data_ucar_edu@1.0.0 | /notes |
| publication_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| title | source · data ucar edu | connector:data_ucar_edu@1.0.0 | /title |
| updated_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 |