Simulation of semi-arid biomass plantations and irrigation using the WRF-NOAH model – A comparison with observations from Israel

8Citations
Citations of this article
24Readers
Mendeley users who have this article in their library.

Abstract

<p><strong>Abstract.</strong> A 10 × 10 km irrigated biomass plantation was simulated in an arid region of Israel to simulate diurnal energy balances during the summer of 2012 (JJA). The goal is to examine daytime horizontal flux gradients between plantation and desert. Simulations were carried out within the coupled WRF-NOAH atmosphere/land surface model. MODIS land surface data was adjusted by prescribing tailored land surface and soil/plant parameters, and by adding a controllable sub-surface irrigation scheme to NOAH. Two model cases studies were compared – <i>Impact</i> and <i>Control</i>. Impact simulates the irrigated plantation. Control simulates the existing land surface, where the predominant land surface is bare desert soil. Central to the study is parameter validation against land surface observations from a desert site and from a 400 ha <i>Simmondsia chinensis</i> (jojoba) plantation. Control was validated with desert observations, and Impact with Jojoba observations. Model evapotranspiration was validated with two Penman–Monteith estimates based on the observations. <br><br> Control simulates daytime desert conditions with a maximum deviation for surface 2 m air temperatures (<i>T</i>2) of 0.2 °C, vapour pressure deficit (VPD) of 0.25 hPa, wind speed (<i>U</i>) of 0.5 m s<sup>−1</sup>, surface radiation (<i>R</i><sub>n</sub>) of 25 W m<sup>−2</sup>, soil heat flux (<i>G</i>) of 30 W m<sup>−2</sup> and 5 cm soil temperatures (ST5) of 1.5 °C. Impact simulates irrigated vegetation conditions with a maximum deviation for <i>T</i>2 of 1–1.5 °C, VPD of 0.5 hPa, <i>U</i> of 0.5 m s<sup>−1</sup>, <i>R</i><sub>n</sub> of 50 W m<sup>&amp;minus;5</sup>, <i>G</i> of 40 W m<sup>−2</sup> and ST5 of 2 °C. Latent heat curves in Impact correspond closely with Penman–Monteith estimates, and magnitudes of 160 W m<sup>−2</sup> over the plantation are usual. Sensible heat fluxes, are around 450 W m<sup>−2</sup> and are at least 100–110 W m<sup>−2</sup> higher than the surrounding desert. This surplus is driven by reduced albedo and high surface resistance, and demonstrates that high evaporation rates may not occur over Jojoba if irrigation is optimized. Furthermore, increased daytime <i>T</i>2 over plantations highlight the need for hourly as well as daily mean statistics. Daily mean statistics alone may imply an overall cooling effect due to surplus nocturnal cooling, when in fact a daytime warming effect is observed.</p>

Cite

CITATION STYLE

APA

Branch, O., Warrach-Sagi, K., Wulfmeyer, V., & Cohen, S. (2014). Simulation of semi-arid biomass plantations and irrigation using the WRF-NOAH model &ndash; A comparison with observations from Israel. Hydrology and Earth System Sciences, 18(5), 1761–1783. https://doi.org/10.5194/hess-18-1761-2014

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free