Work

Influence of grazing management strategy and data time scales on estimates of sensible heat flux in grasslands

Year: 2024

Type: article

Abstract: Inner Mongolia Autonomous Region, North China Sensible heat flux (H) quantifies the intensity of water evapotranspiration, making the factors influencing H pivotal to water consumption. North China's semi-arid grasslands are characterized by widespread grazing and strong wind conditions. Grazing strategy modifies surface air heat transfer resistance via vegetation and consequently alters H. Nevertheless, the majority of studies overlook the impact of the observed variables' time scale on H estimation. This paper employs a "big-leaf" model to estimate H, incorporating both grazing management strategy and data time scale, validated using the Bowen ratio, and attempted to analyze the factors that affect H. Aerodynamic characteristics estimated from daily data typically exceed estimates derived from hourly data. The influence of surface radiative temperature and air temperature on H outweighs that of aerodynamic resistance, whereas aerodynamic resistance accounts for the disparity in estimating H between daily and hourly data. In grazing-prohibited grasslands, the daily H values estimated by the Big Leaf model closely match those obtained from the Bowen ratio. When estimating the hourly H value for grazing prohibited and grazing grasslands, the increase was 25.95 w/m2 and 52.27 w/m2 compared to the daily scale, respectively. For the estimation of water and heat fluxes across different regions, the temporal scale of input data is a pivotal factor. • Aerodynamic characteristics respond differently to time scales. • The time scale of aerodynamic resistance affects the estimation of H. • Grazing management influences time-scale effects of heat transfer resistance. • H estimated at hourly scales was higher than at daily scales. • Temperature is more important than aerodynamic for H.

Source: Journal of Hydrology Regional Studies

DOI: 10.1016/j.ejrh.2024.101949