Sensible heat flux of oil palm plantation: Comparing Aerodynamic and Penman-Monteith Methods

Komarudin, Nurul Amri; June, Tania; Meijide, Ana

doi:10.1088/1755-1315/54/1/012007

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…These differences were observed in our study although wind speeds at all sites were relatively low ranging from 0.07 to 0.16 m/s. According to Komarudin, June & Meijide (2017), wind speeds will decline closer to the surface due to restrictions to air movement caused by the interaction between the surface and thus support what was observed in our study.…”

Section: Discussionsupporting

confidence: 91%

Land use conversion from peat swamp forest to oil palm agriculture greatly modifies microclimate and soil conditions

Anamulai

Sanusi

Zubaid

et al. 2019

PeerJ

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Oil palm (Elaeis guineensis) agriculture is rapidly expanding and requires large areas of land in the tropics to meet the global demand for palm oil products. Land cover conversion of peat swamp forest to oil palm (large- and small-scale oil palm production) is likely to have negative impacts on microhabitat conditions. This study assessed the impact of peat swamp forest conversion to oil palm plantation on microclimate conditions and soil characteristics. The measurement of microclimate (air temperature, wind speed, light intensity and relative humidity) and soil characteristics (soil surface temperature, soil pH, soil moisture, and ground cover vegetation temperature) were compared at a peat swamp forest, smallholdings and a large-scale plantation. Results showed that the peat swamp forest was 1.5–2.3 °C cooler with significantly greater relative humidity, lower light intensities and wind speed compared to the smallholdings and large-scale plantations. Soil characteristics were also significantly different between the peat swamp forest and both types of oil palm plantations with lower soil pH, soil and ground cover vegetation surface temperatures and greater soil moisture in the peat swamp forest. These results suggest that peat swamp forests have greater ecosystem benefits compared to oil palm plantations with smallholdings agricultural approach as a promising management practice to improve microhabitat conditions. Our findings also justify the conservation of remaining peat swamp forest as it provides a refuge from harsh microclimatic conditions that characterize large plantations and smallholdings.

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Section: Discussionsupporting

confidence: 91%

Land use conversion from peat swamp forest to oil palm agriculture greatly modifies microclimate and soil conditions

Anamulai

Sanusi

Zubaid

et al. 2019

PeerJ

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“…In addition, the PM-FAO method usually causes errors in ET 0 calculations in sparsely vegetated areas partly due to the inaccurate calculation of the slope of the saturation vapor pressure curve and the long-wave radiation emission from the surface (Dhungel et al, 2014). These flaws have been confirmed by researches that estimate the ET 0 based on the framework of PM method and the remote sensing data (Amri Komarudin et al, 2017;Mallick et al, 2015). Such overestimation or errors of ET 0 calculation may bring the problem of surface energy balance, which, in turn, creates a huge challenge for obtaining accurate and reasonable estimation of ET 0 when applying the PM method.…”

Section: Introductionmentioning

confidence: 99%

The Uncertainty of Penman‐Monteith Method and the Energy Balance Closure Problem

Hao

Zhang

et al. 2018

JGR Atmospheres

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The Penman‐Monteith (PM) method is considered the most accurate method for estimating reference crop evapotranspiration (ET0). However, the method has obvious flaws in energy balance closure. In this study, the changing trends between latent heat flux of ET0 (LEp) and surface net radiation (Rn) in China were analyzed based on observational data from 800 meteorological stations. The results showed that the multiyear average ratio of LEp/Rn was highest in the warm temperate zone and was lowest in the subfrigid zone of the Tibetan Plateau. Correspondingly, the values of LEp/Rn in these areas were ranged from 1.138 to 0.647. At the site scale, there were 61, 178, and 170 meteorological stations with daily average LEp/Rn values >1 during three periods (from January to April, May to August, and September to December, respectively). The ratio of LEp/Rn showed an obvious surface energy imbalance, and it was extremely obvious in northern China. Meanwhile, it is found that there was also great uncertainty of the ET0, which estimated based on the calculated and measured net radiation. In general, the uncertainty of ET0 was ranged from −0.955 to 1.028 mm/day and the average value of uncertainty was 0.154 mm/day. The uncertainty also showed obviously temporal variation, which was lower during April to October, but was higher in other times. The main cause of the energy balance closure problem was the overestimation of the aerodynamic component of ET0. In view of such situation, this study suggested the two ways to estimate ET0 for different regions.

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“…Based on [21], the METRIC model uses the standardized ASCE Penman-Monteith equation as reference evapotranspiration. However, due to different characteristics of the surface in oil palm plantations, the principle of physics method so-called Penman-Monteith (𝐸𝑇 0 ) from Food and Agricultural Organization (FAO) 56 was used as reference evapotranspiration (ETr) [27], which appropriated to estimate the heat flux in oil palm plantation either at young or adult ages [15].…”

Section: Calibration Of Sensible Heat Fluxmentioning

confidence: 99%

Applied Different Pixel Selection in METRIC Model for Estimating Spatial Daily Evapotranspiration of Oil Palm in East Kalimantan Province, Indonesia

Dhohir,

June

2023

jsds

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Determination of evapotranspiration (ET) plays a key role in managing water in oil palm plantations. Several energy balances models have been developed for mapping evapotranspiration regionally. Subsequently, this study aims to estimate daily evapotranspiration in oil palm plantation using the METRIC model, where pixel selection used and corrected by hot and cold pixels. The climate data were collected from ERA-5 Reanalysis and Landsat 8 was used for spatial analysis. The result depicts the means ± standard deviation of ET without pixel selection (with pixel selection), specifically for oil palms age of 4, 6, 7, 8, 9, 11, 12 and 13 years were 3.19 ± 1.62 mm d-1, 3.31 ± 1.14 mm d-1, 4.01 ± 0.96 mm d-1, 4.84 ± 0.87 mm d-1, 6.29 ± 0.43 mm d-1, 5.72 ± 0.44 mm d-1, 6.43 ± 0.23 mm d-1 and 6.21 ± 0.33 mm d-1 (4.22 ± 0.49 mm d-1, 3.99 ± 0.22 mm d-1, 2.96 ± 0.34 mm d-1, 3.14 ± 0.33 mm d-1, 4.22 ± 0.49 mm d-1, 3.99 ± 0.22 mm d-1, 4.26 ± 0.24 mm d-1 and 4.18 ± 0.30 mm d-1), respectively. We have found more accurate ET determination with pixel selection (higher coefficient of determination).

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Sensible heat flux of oil palm plantation: Comparing Aerodynamic and Penman-Monteith Methods

Cited by 3 publications

References 3 publications

Land use conversion from peat swamp forest to oil palm agriculture greatly modifies microclimate and soil conditions

Land use conversion from peat swamp forest to oil palm agriculture greatly modifies microclimate and soil conditions

The Uncertainty of Penman‐Monteith Method and the Energy Balance Closure Problem

Applied Different Pixel Selection in METRIC Model for Estimating Spatial Daily Evapotranspiration of Oil Palm in East Kalimantan Province, Indonesia

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