Changes in reference evapotranspiration and its driving factors in peninsular Malaysia

Pour, Sahar Hadi; Wahab, Ahmad Khairi Abd; Shahid, Shamsuddin; Ismail, Zulhilmi

doi:10.1016/j.atmosres.2020.105096

Cited by 80 publications

(39 citation statements)

References 74 publications

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“…Using the European Centre for Medium-Range Weather Forecasts Reanalysis version 5 (ERA-5) outputs and different ET 0 equations, Aadhar and Mishra (2020) indicated increases in the annual ET 0 estimates during 1979-2018 in northeastern India (corresponding to northwestern ICP). Pour et al (2020) also found that the annual ET 0 increased in the 1970s-2010s in northern peninsular Malaysia (related to southernmost ICP). These studies confirmed the results of the present study to some extent.…”

Section: Comparisons Of Resultsmentioning

confidence: 76%

“…The findings in this study showed that the annual ET 0 exhibited increasing trends in ICP and the six subregions with a rate ranging from 0.33 to 0.80 mm/year, and the increases occurred in the majority (>90%) of ICP. Due to the lack of investigations in the whole ICP, results of several studies regarding ICP's subregions (e.g., northeastern ICP, northeast India, and peninsular Malaysia; Sun et al, 2017a;Aadhar and Mishra, 2020;Pour et al, 2020) were used for cross-reference comparisons. The locations of positive and negative ET 0 trends on both annual and monthly scales in Southwest China (SWC, which overlays northeastern ICP), which were found by Sun et al (2017a) based on the observational meteorological datasets and the FAO-56 Penman-Monteith equation, generally coincided with the findings of this study in northeastern ICP.…”

Section: Comparisons Of Resultsmentioning

confidence: 99%

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Changes in the reference evapotranspiration and contributions of climate factors over the Indo–China Peninsula during 1961–2017

Sun

Chen

et al. 2021

Intl Journal of Climatology

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Given the key roles of the Indo-China Peninsula (ICP) in weather and climate systems, hydrometeorology, and ecology, the annual and monthly changes in the Food and Agriculture Organization-56 Penman-Monteith reference evapotranspiration (ET 0 ), which was calculated based on the Climatic Research Unit datasets, were investigated in ICP during 1961-2017. The annual ICP ET 0 significantly (p < .05) increased, with different increasing tendencies in most months. In particular, larger and more significant (p < .05) ET 0 values were found during October-December. The annual and monthly ET 0 changes showed evident spatial differences, characterized by increases in more than 50% of the ICP area except for decreases in around 70% of that area during March-May. A sensitivity experiment-based separation method was utilized to evaluate the contribution of each influential factor, and the corresponding determinants were identified by comparing the contributions. Results showed that the annual ICP ET 0 increase was attributed to the increased vapour pressure deficit (Vpd). However, the annual determinants varied spatially, with net solar radiation (Rn) in the southern region of ICP, wind speed (Wnd) in the northeast, and Vpd in the remaining regions. The monthly ICP determinant was Wnd in January, March-May and December, and Vpd for the remaining months. Despite different spatial patterns of monthly dominants, Vpd and Wnd were the determinants with the most extensive distributions over ICP (>75% of ICP in total). The results of this study can significantly fulfil the research gap regarding the ICP ET 0 changes and the underlying mechanisms.

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Section: Comparisons Of Resultsmentioning

confidence: 76%

Section: Comparisons Of Resultsmentioning

confidence: 99%

Changes in the reference evapotranspiration and contributions of climate factors over the Indo–China Peninsula during 1961–2017

Sun

Chen

et al. 2021

Intl Journal of Climatology

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“…Wang et al [13] found that wind speed was the most influential climatic variable for ET variability in China during 1961−2013, followed by the maximum daily temperature and sunlight duration. Pour et al [14] reported that minimum temperature was the most influential factor for ET increase in peninsular Malaysia. Additionally, the rate of evaporation from open pans of water in the Northern Hemisphere has been steadily decreasing in past decades, which is in contrast with the expectation that a warming climate should cause an increase in the rate of evaporation from terrestrial open water bodies [15].…”

Section: Introductionmentioning

confidence: 99%

Quantifying the Responses of Evapotranspiration and Its Components to Vegetation Restoration and Climate Change on the Loess Plateau of China

Qiu

Shi

et al. 2021

Remote Sensing

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Quantitatively identifying the influences of vegetation restoration (VR) on water resources is crucial to ecological planning. Although vegetation coverage has improved on the Loess Plateau (LP) of China since the implementation of VR policy, the way vegetation dynamics influences regional evapotranspiration (ET) remains controversial. In this study, we first investigate long-term spatiotemporal trends of total ET (TET) components, including ground evaporation (GE) and canopy ET (CET, sum of canopy interception and canopy transpiration) based on the GLEAM-ET dataset. The ET changes are attributed to VR on the LP from 2000 to 2015 and these results are quantitatively evaluated here using the Community Land Model (CLM). Finally, the relative contributions of VR and climate change to ET are identified by combining climate scenarios and VR scenarios. The results show that the positive effect of VR on CET is offset by the negative effect of VR on GE, which results in a weak variation in TET at an annual scale and an increased TET is only shown in summer. Regardless of the representative concentration pathway (RCP4.5 or RCP8.5), differences resulted from the responses of TET to different vegetation conditions ranging from −3.7 to −1.2 mm, while climate change from RCP4.5 to RCP8.5 caused an increase in TET ranging from 0.1 to 65.3 mm. These findings imply that climate change might play a dominant role in ET variability on the LP, and this work emphasizes the importance of comprehensively considering the interactions among climate factors to assess the relative contributions of VR and climate change to ET.

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“…Coral islands in the South China Sea have a tropical oceanic monsoon climate, where vegetation is somewhat similar to the tropical dry evergreen forests in Southeast Asia [47]. Pour et al [48] demonstrated that the minimum temperature (31.5-48.2%) is the most influencing factor, followed by wind speed (15.1-32.8%), in defining ET p in peninsular Malaysia. To identify the dominant driving factors for ET a of the coral islands in the South China Sea, partial correlation analysis was used based on the detrending data series for each grid.…”

Section: Dominant Driving Factors For Et Amentioning

confidence: 99%

Evapotranspiration on Natural and Reclaimed Coral Islands in the South China Sea

Han

Liu

et al. 2021

Remote Sensing

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Studies of evapotranspiration on remote tropical coral islands are important to explore and sustain scarce freshwater resources. However, there is a significant knowledge gap between research to evaluate evapotranspiration based on remote sensing methods and the influences of different land use types on water dynamics on reclaimed coral islands. This study applied the remote-sensing-based Vegetation Interfaces Processes (VIP-RS) model to estimate actual evapotranspiration (ETa) on Zhaoshu Island, Yongxing Island, and Yongshu Island in the South China Sea from 2016 to 2019. The results showed that the average annual ETa of Zhaoshu Island, Yongxing Island, and Yongshu Island was 685 mm, 530 mm, and 210 mm, respectively. Annual transpiration (Ec) and soil evaporation (Es) exhibited similar patterns on the natural islands; however, Es controlled the water consumption on the reclaimed islands. Water dynamics exhibited seasonal fluctuations due to the uneven distribution of precipitation (PRP). However, ETa of the natural islands was higher than PRP in the dry season, indicating vegetation has to absorb water from the groundwater to sustain growth. The results also agreed with the analysis of dominant driving factors based on partial correlation analysis, which demonstrated that the Normalized Difference Vegetation Index (NDVI) is the most important factor that influences ETa, while relative humidity (RH) controlled the bare land or sparsely vegetated areas on the reclaimed islands. The setting of different land use types showed that vegetation and built-up or hardened roads took control of evapotranspiration and rainwater collection, respectively, which play important roles in water dynamics on corals islands. The evaluation of ETa based on a remote-sensing-based model overcame the difficulty in fieldwork observation, which improves the certainty and accuracy at a spatial scale. In addition, it gave us a new reference to protect and manage scarce freshwater resources properly.

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Changes in reference evapotranspiration and its driving factors in peninsular Malaysia

Cited by 80 publications

References 74 publications

Changes in the reference evapotranspiration and contributions of climate factors over the Indo–China Peninsula during 1961–2017

Changes in the reference evapotranspiration and contributions of climate factors over the Indo–China Peninsula during 1961–2017

Quantifying the Responses of Evapotranspiration and Its Components to Vegetation Restoration and Climate Change on the Loess Plateau of China

Evapotranspiration on Natural and Reclaimed Coral Islands in the South China Sea

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