Research Note #002Experimental DraftPublished: 14 August 2026
Stomatal Conductance & Boundary-Layer Transpiration Shifts
Author: Vriksh Vani Biophysics Lab · Subhash Koli
DOI: 10.1016/vrikshvani.2026.002
Executive Abstract
Boundary-layer air resistance (ra) plays a critical role in modulating leaf-to-air thermal exchange. This study evaluates how indoor micro-airflow velocity (0.1–1.5 m/s) alters leaf temperature recovery kinetics and stomatal conductance (gs) calculations. Experimental findings demonstrate that mild convection (0.5 m/s) enhances evaporative cooling precision, while higher wind speeds (>1.2 m/s) trigger mechanical stomatal closure.
1. Boundary Layer Formulation
Stomatal conductance (gs) is derived from leaf-to-air energy balance parameters using the Penman-Monteith inversion:
g_s = \frac{\gamma \cdot H}{\rho c_p (e_s(T_{leaf}) - e_a) - \gamma H r_a}
2. Micro-Airflow Telemetry Observations
| Airflow Speed (m/s) | Leaf ΔT (°C) | Boundary r_a (s/m) | Conductance g_s (mol/m²s) | Physiological Response |
|---|---|---|---|---|
| 0.1 m/s | -1.6°C | 240 s/m | 0.35 | Low Airflow / High Boundary Layer |
| 0.5 m/s | -1.9°C | 120 s/m | 0.42 | Optimal Boundary Layer Thinning |
| 1 m/s | -1.2°C | 75 s/m | 0.38 | Elevated Convective Heat Transfer |
| 1.5 m/s | -0.4°C | 50 s/m | 0.28 | Wind-Induced Stomatal Restriction |
Download Open Boundary Layer Telemetry
Access open CSV and JSON datasets detailing boundary-layer air resistance and leaf thermal recovery curves.