Trend Analysis of the Reference Evapotranspiration for the Southwestern Amazon, Brazil.

Silva, Helder J Farias; Lúcio, Paulo Sérgio; Brown, I. Foster

doi:10.5935/2237-2202.20160027

Cited by 4 publications

(3 citation statements)

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“…This condition is followed by increasing trends in soil moisture deficit and drought occurrence. The similar results are found in Spain (Espadafor et al, 2011), Iran (Amirataee et al, 2016), Montenegro (Knežević et al, 2018), Slovenia (Zupanc & Pintar, 2004) Brazil (Silva et al, 2016) and Togo (Djaman & Komla, 2015). Likewise, many authors reported the increased trend in the annual value of potential evapotranspiration (Čadro et al, 2016), soil water deficit Žurovec & Čadro, 2010Cammalleri et al, 2016) and drought severity (Vlahinić et al, 2001;Stankūnavičius, 2009;Žurovec et al, 2011;Hodžić et al, 2013;Taparauskienė & Lukševičiūtė, 2015;Čadro Sabrija et al, 2017;Merl, 2017) in humid areas of Bosnia and Herzegovina and Lithuania.…”

Section: Introductionsupporting

confidence: 80%

Impact of Climate Change on the Annual Water Balance in a Humid Climate

Čadro¹,

Miseckaitė²,

Gavrić³

et al. 2018

AgricultForest

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Lithuania and Bosnia and Herzegovina are considered as countries with high vulnerability and low adaptive capacity to cope with climate change. The entire territory of these countries is characterized by the warming trend, with positive trends in both the maximum and the minimum temperatures throughout the year. The increase in air temperature has resulted in change of evapotranspiration and mean annual water balance values. These countries are also frequently faced with an occurrence of severe droughts and heavy floods. The main purpose of this study was to determine and compare the severity of changes in mean annual water balance for two humid climatic zones, in order to understand how different areas of similar climate characteristics react to climate change and to analyze the significance of their influence. Monthly weather data from two weather stations, Kaunas (Lithuania) and Sarajevo (Bosnia and Herzegovina), for the time period of 30 years (1988 -2017) were used to determine and analyze the mean annual water balance. The results indicate that climate change has a different effect on the water balance of these two humid areas. Both locations showed a positive trend of reference evapotranspiration, with an increase of 1.450 mm year -1 to 1.503 mm year -1 . However, the total runoff and soil moisture deficit are decreasing in Kaunas (-0.480 mm and -2.114 mm year -1 , respectively), while they are increasing in Sarajevo (0.492 mm and 0.485 mm year -1 , respectively).

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Section: Introductionsupporting

confidence: 80%

Impact of Climate Change on the Annual Water Balance in a Humid Climate

Čadro¹,

Miseckaitė²,

Gavrić³

et al. 2018

AgricultForest

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“…The null hypothesis considers no trend among the observations and the alternative hypothesis represents a monotonic trend [60]. Since the MK test cannot provide the slope of the trend (magnitude), the Sen method, a nonparametric estimator [61], was used to determine the magnitude of the trend [62]. Negative S values show a downward trend and positive values present an upward trend.…”

Section: Performance Analysis Of Et-vismentioning

confidence: 99%

Estimating Actual Evapotranspiration over Croplands Using Vegetation Index Methods and Dynamic Harvested Area

et al. 2021

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Advances in estimating actual evapotranspiration (ETa) with remote sensing (RS) have contributed to improving hydrological, agricultural, and climatological studies. In this study, we evaluated the applicability of Vegetation-Index (VI) -based ETa (ET-VI) for mapping and monitoring drought in arid agricultural systems in a region where a lack of ground data hampers ETa work. To map ETa (2000–2019), ET-VIs were translated and localized using Landsat-derived 3- and 2-band Enhanced Vegetation Indices (EVI and EVI2) over croplands in the Zayandehrud River Basin (ZRB) in Iran. Since EVI and EVI2 were optimized for the MODerate Imaging Spectroradiometer (MODIS), using these VIs with Landsat sensors required a cross-sensor transformation to allow for their use in the ET-VI algorithm. The before- and after- impact of applying these empirical translation methods on the ETa estimations was examined. We also compared the effect of cropping patterns’ interannual change on the annual ETa rate using the maximum Normalized Difference Vegetation Index (NDVI) time series. The performance of the different ET-VIs products was then evaluated. Our results show that ETa estimates agreed well with each other and are all suitable to monitor ETa in the ZRB. Compared to ETc values, ETa estimations from MODIS-based continuity corrected Landsat-EVI (EVI2) (EVIMccL and EVI2MccL) performed slightly better across croplands than those of Landsat-EVI (EVI2) without transformation. The analysis of harvested areas and ET-VIs anomalies revealed a decline in the extent of cultivated areas and a loss of corresponding water resources downstream. The findings show the importance of continuity correction across sensors when using empirical algorithms designed and optimized for specific sensors. Our comprehensive ETa estimation of agricultural water use at 30 m spatial resolution provides an inexpensive monitoring tool for cropping areas and their water consumption.

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“…Nevertheless, it is justified to say that a trend of increasing dryness has been observed as the amount of water available for plants has decreased due to rising temperatures. The result is an increased reference evapotranspiration over the last 30 years (Almeida et al 2016;da Silva et al 2016). Furthermore, it has been observed that dry seasons have become longer over the whole of southern Amazonia (Fu et al 2013).…”

Section: Climate In the Area Of The Bamboo Forestsmentioning

confidence: 99%

Bamboo, climate change and forest use: A critical combination for southwestern Amazonian forests?

Ferreira¹,

Kalliola

Ruokolainen

2019

Ambio

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About 160 000 km 2 of forests in the border zone between Brazil and Peru are dominated by semi-scandent bamboos (Guadua spp.). We argue that both predicted decreased precipitation during the dry season and widespread anthropogenic disturbances will significantly increase the distribution and biomass of bamboos in the area. Seasonal dryness favours the growth of evergreen bamboos in relation to trees that shed their leaves during the dry season. Disturbance can be beneficial for the bamboo because, as a clonal plant, it is often able to recover more rapidly than trees. It also withstands dry season better than many trees. The bamboo life cycle ends in a mass mortality event every 28 years, producing potential fuel for a forest fire. Presently, natural forest fires hardly exist in the area. However, in the projected future climate with more pronounced dry season and with increased fuel load after bamboo die-off events the forests may start to catch fire that has escaped from inhabited areas or even started naturally. Fires can kill trees, thus further increasing the fuel load of the forest. As a result, the landscape may start to convert to a savanna ecosystem.

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Trend Analysis of the Reference Evapotranspiration for the Southwestern Amazon, Brazil.

Cited by 4 publications

References 0 publications

Impact of Climate Change on the Annual Water Balance in a Humid Climate

Impact of Climate Change on the Annual Water Balance in a Humid Climate

Estimating Actual Evapotranspiration over Croplands Using Vegetation Index Methods and Dynamic Harvested Area

Bamboo, climate change and forest use: A critical combination for southwestern Amazonian forests?

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