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Studies have shown that the footprint of a single eddy covariance (EC) system may not yield representative measurements of the turbulent fluxes at the field scale for sparse vegetated surfaces, whereas scintillometry, due to its larger footprint, may be more suitable for this purpose. However, the latter approach strongly relies on the Monin-Obukov similarity theory (MOST) that strictly applies in the inertial sub-layer only. This work aims at experimentally confirm the reliability of displaced-beam laser scintillometers (DBLS) measurements over an olive orchard against two EC systems during summer and autumn months of 2007 through 2009. It was found that the DBLS underestimated both the momentum and sensible heat fluxes by 15 to 20% when established retrieval procedures were applied. A new method to determine the sensible heat flux from the DBLS based on the addition of a single-height wind speed measurement was tested, yielding estimates that compare well with the EC observations, with discrepancies in sensible heat fluxes of about 30 to 40 W m-2.

The concept of reference potranspiration is widely used to support water resource management in agriculture and for irrigation scheduling, especially under arid and semi-arid conditions. The Penman-Monteith standardized formulations, as suggested by ASCE and FAO-56 papers, are generally applied for accurate estimations of ETo, at hourly and daily scale. When detailed meteorological information are not available, several alternative and simplified equations, using a limited number of variables, have been proposed (Blaney-Criddle, HargreavesSamani, Turc, Makkinen and Pristley-Taylor). In this paper, scintillometer measurements collected for six month in 2005, on an experimental plot under “reference” conditions, were used to validate different ETo equations at hourly and daily scale. Experimental plot is located in a typical agricultural Mediterranean environment (Sicily, Italy), where olive groves is the dominant crop. As proved by other researches, the comparison confirmed the best agreement between estimated and measured fluxes corresponds to FAO-56 Penman-Monteith standardized equation, that was characterized by both the lowest average error and the minimum bias. However, the analysis also evidenced a quite good performance of Pristley-Taylor equation, that can be considered as a valid alternative to the more sophisticated PenmanMonteith method. The different ETo series, obtained by the considered simplified equations, were then used as input in the FAO-56 water balance model, in order to evaluate, for olive groves, the errors on estimated actual evapotranspiration ET. To this aim soil and crop model input parameters were settled by considering previous experimental researches already used to calibrate and validate the FAO-56 water balance model on olive groves, for the same study area. Also in this case, assuming as the true values of ET those obtained using the water balance coupled with Penman- Monteith ETo input values, the Priestley-Taylor equation, requiring a limited number of input meteorological data, was characterized by the best performance if compared to the other equations used to evaluate ETo. Under environments conditions similar to those considered therefore, according to the good performance associated to the Priestley-Tailor approach, FAO-56 model can allow realistic estimation of ET, even in absence of a full meteorological dataset.

Funding Information: This open-access publication was funded by the University of Freiburg. Funding Information: Financial support. The project is supported by the Wassernetzwerk Baden-Württemberg (Water Research Network of the State Baden-Württemberg), which is funded by the Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg (Ministry of Science, Research and the Arts of the State Baden-Württemberg) (grant no. AZ. 7532.21/2.1.6) and Maa-ja vesitekniikan tuki ry foundation. Doris E. Wendt acknowledges her support as part of the NERC-funded Groundwater Drought Initiative (NE/R004994/1). Lucy J. Barker was supported by the Natural Environment Research Council (NE/R016429/1) as part of the UK-SCAPE programme delivering National Capability. The contributions of Mirek Trnka, Lenka Bartošová, and Jaak Jaagus have been supported by SustES – Adaptation strategies for sustainable ecosystem services and food security under adverse environmental conditions (CZ.02.1.01/0.0/0.0/16_019/0000797). Publisher Copyright: © 2022 Veit Blauhut et al. Drought events and their impacts vary spatially and temporally due to diverse pedo-climatic and hydrologic conditions, as well as variations in exposure and vulnerability, such as demographics and response actions. While hazard severity and frequency of past drought events have been studied in detail, little is known about the effect of drought management strategies on the actual impacts and how the hazard is perceived by relevant stakeholders. In a continental study, we characterised and assessed the impacts and the perceptions of two recent drought events (2018 and 2019) in Europe and examined the relationship between management strategies and drought perception, hazard, and impact. The study was based on a pan-European survey involving national representatives from 28 countries and relevant stakeholders responding to a standard questionnaire. The survey focused on collecting information on stakeholders' perceptions of drought, impacts on water resources and beyond, water availability, and current drought management strategies on national and regional scales. The survey results were compared with the actual drought hazard information registered by the European Drought Observatory (EDO) for 2018 and 2019. The results highlighted high diversity in drought perception across different countries and in values of the implemented drought management strategies to alleviate impacts by increasing national and sub-national awareness and resilience. The study identifies an urgent need to further reduce drought impacts by constructing and implementing a European macro-level drought governance approach, such as a directive, which would strengthen national drought management and mitigate damage to human and natural assets.

Thermal infrared (TIR) remote sensing of land-surface temperature (LST) provides valuable information about the sub-surface moisture status required for estimating evapotranspiration (ET) and detecting the onset and severity of drought. While empirical indices measuring anomalies in LST and vegetation amount (e.g., as quantified by the Normalized Difference Vegetation Index; NDVI) have demonstrated utility in monitoring ET and drought conditions over large areas, they may provide ambiguous results when other factors (e.g., air temperature, advection) are affecting plant functioning. A more physically based interpretation of LST and NDVI and their relationship to sub-surface moisture conditions can be obtained with a surface energy balance model driven by TIR remote sensing. The Atmosphere-Land Exchange Inverse (ALEXI) model is a multi-sensor TIR approach to ET mapping, coupling a two-source (soil + canopy) land-surface model with an atmospheric boundary layer model in time-differencing mode to routinely and robustly map daily fluxes at continental scales and 5 to 10-km resolution using thermal band imagery and insolation estimates from geostationary satellites. A related algorithm (DisALEXI) spatially disaggregates ALEXI fluxes down to finer spatial scales using moderate resolution TIR imagery from polar orbiting satellites. An overview of this modeling approach is presented, along with strategies for fusing information from multiple satellite platforms and wavebands to map daily ET down to resolutions on the order of 10 m. The ALEXI/DisALEXI model has potential for global applications by integrating data from multiple geostationary meteorological satellite systems, such as the US Geostationary Operational Environmental Satellites, the European Meteosat satellites, the Chinese Fen-yung 2B series, and the Japanese Geostationary Meteorological Satellites. Work is underway to further evaluate multi-scale ALEXI implementations over the US, Europe, Africa and other continents with geostationary satellite coverage.

For open orchard and vineyard canopies containing significant fractions of exposed soil (>50%), typical of Mediterranean agricultural regions, the energy balance of the vegetation elements is strongly influenced by heat exchange with the bare soil/substrate. For these agricultural systems a "two-source" approach, where radiation and turbulent exchange between the soil and canopy elements are explicitly modelled, appears to be the only suitable methodology for reliably assessing energy fluxes. In strongly clumped canopies, the effective wind speed profile inside and below the canopy layer can highly influence the partitioning of energy fluxes between the soil and vegetation components. To assess the impact of in-canopy wind profile on model flux estimates, an analysis of three different formulations is presented, including algorithms from Goudriaan (1977), Massman (1987) and Lalic et al. (2003). The in-canopy wind profile formulations are applied to the thermal-based Two-Source Energy Balance (TSEB) model developed by Norman et al. (1995) and modified by Kustas and Norman (1999). High resolution airborne remote sensing images, collected over an agricultural area located in the western part of Sicily (Italy) comprised primarily of vineyards, olive and citrus orchards, are used to derive all the input parameters need to apply the TSEB. The images were acquired from June to October 2008 and include a relatively wide range of meteorological and soil moisture conditions. A preliminary sensitivity analysis of the three wind profile algorithms highlight the dependence of wind speed just above the soil/substrate to leaf area index and canopy height over the typical canopy properties range of these agricultural area. It is found that differences in wind just above surface among the models is most significant under sparse and medium fractional cover conditions (20–60%). The TSEB model heat flux estimates are compared with micrometeorological measurements from a small aperture scintillometer and an eddy covariance tower collected over an olive orchard characterized by moderate fractional vegetation cover (≈35%) and relatively tall crop height (≈3.5 m). TSEB fluxes for the 7 image acquisition dates generated using both the Massman and Goudriaan in-canopy wind profile formulations give close agreement with measured fluxes, while the Lalic et al. equations yield poor results. The Massman wind profile scheme slightly outperforms that of Goudriaan, but it requires an additional parameter describing the roughness of the underlying vegetative surface. This parameter is not directly obtainable using remote sensing, hence this study suggests that the Goudriaan formulation for landscape applications is most suitable when detailed site-specific information regarding canopy architecture is unavailable.

For open orchard and vineyard canopies containing significant fractions of exposed soil (>50%), typical of Mediterranean agricultural regions, the energy balance of the vegetation elements is strongly influenced by heat exchange with the bare soil/substrate. For these agricultural systems a "two-source" approach, where radiation and turbulent exchange between the soil and canopy elements are explicitly modelled, appears to be the only suitable methodology for reliably assessing energy fluxes. In strongly clumped canopies, the effective wind speed profile inside and below the canopy layer can strongly influence the partitioning of energy fluxes between the soil and vegetation components. To assess the impact of in-canopy wind profile on model flux estimates, an analysis of three different formulations is presented, including algorithms from Goudriaan (1977), Massman (1987) and Lalic et al. (2003). The in-canopy wind profile formulations are applied to the thermal-based two-source energy balance (TSEB) model developed by Norman et al. (1995) and modified by Kustas and Norman (1999). High resolution airborne remote sensing images, collected over an agricultural area located in the western part of Sicily (Italy) comprised primarily of vineyards, olive and citrus orchards, are used to derive all the input parameters needed to apply the TSEB. The images were acquired from June to October 2008 and include a relatively wide range of meteorological and soil moisture conditions. A preliminary sensitivity analysis of the three wind profile algorithms highlights the dependence of wind speed just above the soil/substrate to leaf area index and canopy height over the typical range of canopy properties encountered in these agricultural areas. It is found that differences among the models in wind just above the soil surface are most significant under sparse and medium fractional cover conditions (15–50%). The TSEB model heat flux estimates are compared with micro-meteorological measurements from a small aperture scintillometer and an eddy covariance tower collected over an olive orchard characterized by moderate fractional vegetation cover (≈35%) and relatively tall crop (≈3.5 m). TSEB fluxes for the 7 image acquisition dates generated using both the Massman and Goudriaan in-canopy wind profile formulations give close agreement with measured fluxes, while the Lalic et al. equations yield poor results. The Massman wind profile scheme slightly outperforms that of Goudriaan, but it requires an additional parameter accounting for the roughness sub-layer of the underlying vegetative surface. The analysis also suggests that within-canopy wind profile model discrepancies become important, in terms of impact on modelled sensible heat flux, only for sparse canopies with moderate vegetation coverage.

While climate change will alter the distribution of water in time and space, quantifications of drought risk under global warming remain uncertain. Here, we show that in Europe, drought damages could strongly increase with global warming and cause a regional imbalance in future drought impacts. In the absence of climate action (4 °C in 2100 and no adaptation), annual drought losses in the European Union and United Kingdom combined are projected to rise to more than €65 billion per year compared with €9 billion per year currently, or two times larger when expressed relative to the size of the economy. Drought losses show the strongest rise in southern and western parts of Europe, where drought conditions at 4 °C could reduce regional agriculture economic output by 10%. With high warming, drought impacts will become a fraction of current impacts in northern and northeastern regions. Keeping global warming well below 2 °C would avoid most impacts in affected regions. Climate change impacts precipitation patterns, and thus the risk for drought. Damages from drought in Europe will increase with losses more than €65 billion per year in a scenario without climate mitigation; keeping warming below 2 °C avoids most impacts.

The outcomes of the 2015 Paris Agreement triggered a number of climate impact assessments, such as for floods and droughts, to focus on future time frames corresponding to the years of reaching specific levels of global warming. Yet, the links between the timing of the warming levels and the corresponding greenhouse gas concentration pathways to reach them remain poorly understood. To address this gap, we compared projected changes of annual mean, extreme high, and extreme low river discharges in Europe at 1.5 &deg, C and 2 &deg, C under Representative Concentration Pathways RCP8.5 and RCP4.5 from an ensemble of regional climate model (RCM) simulations. The statistical significance of the difference between the two scenarios for both warming levels was then evaluated. The results show that in the majority of Europe (&gt, 95% of the surface area for the annual mean discharge, &gt, 98% for high and low extremes), the changes projected in the two pathways were statistically indistinguishable. These results suggest that in studies of changes at global warming levels, the projections of the two pathways can be merged into a single ensemble without major loss of information. With regard to the uncertainty of the unified ensemble, the findings show that the projected changes of annual mean, extreme high, and extreme low river discharge were statistically significant in large portions of Europe.

According to the opinion accepted by most, labour law was born in the late nineteenth century in connection with the production processes delivered by the Industrial Revolution. Its genesis follows the paradigm for which is the main feature of this new production model to generate both socioeconomic and legal subordination. So, keeping this basic assumption, a research that wanted to investigate the origins of the employment, back-links from this period, it seems to stand outside of the legal framework that constitute generally its reference system. For the same reason, also the new post-industrial work organisation in the era of globalisation, although for different reasons and yet paradoxical, it tends to stand outside the natural riverbed of labor law and it tends to breaking free from it. This is the reason why there is the current tendency to talk about the labor market law, jobs law, job protections, rather than labour law and employment law. You can not escape that in every age, however, the concern of the law has been, and it always is, to assign the protection to who, by himself, that protection can not give it to himself. Well, this situation is an essential common need of the labour law both pre-industrial and industrial and post-industrial. Thus, the basic concerns of labour law in the era of globalisation are not different from those of previous eras. Let's change the superstructure of utilisation / exploitation of the labor of others - and correspondingly the legal structures that govern them - but it do not change the structures on which those forms are inserted; - in fact, at the root of it all there is the person, in one of its many most qualifying natural phenomena: that of work. Now, the Bible (both the Hebrew and Christian, in its different denominations) is - of course - a common humus to the whole so called the West and - in part - even to the Islam. As you know, the inextricable intertwining of theological requirements with social requirements, that are typical of theocratic societies, on the one side whether it does not make it easy to distinguish the one from the other (even supposing that such hermeneutic approach it can be useful and accessible); on the other side it might help to identify protection structures that, as referring to man in his relationship with creation - ( in the secular sense for non-believers ) and the creator - could likely to be erected to universal rules, without space or time, rules good to delineate the outer limits of regulation of employment at any time and any where. The purpose of this research is to catalogue the biblical texts - notably in a first phase those which are in the first (or old) testament of the Christian Bible - which contain both prescriptive structures and pathways, designed to protect the position of social weakness and minority of the worker, understood in its broadest sense and in its various and diverse facets: of worker, of salaried, of servant, even of slave, and so on. The starting point and most immediate objective of this work is therefore to find the biblical sources - and to get ready one first critical apparatus - which they refer to, directly or indirectly, to work in broad sense, that is a personal relationship in which one of the two subjects of it, is in a position of weakness, comparable to that which the Bible considers typical for orphans , widows, the poor and in some respects for foreigners: a one word the Weaks.

Reference evapotranspiration (ET 0 ) is widely used for irrigation scheduling, to promote an efficient use of water resources for a sustainable agro-ecosystem productivity, as well as to manage water quality and to face other environmental concerns. As suggested by ASCE-EWRI and FAO, standard Penman–Monteith methods are generally applied for an accurate estimation of ET 0 from hourly to daily scale. In absence of detailed meteorological information several simplified equations, using a limited number of variables, have been proposed as alternative. In this paper, the performance of different reference evapotranspiration methods, at hourly (Penman–Monteith, Pristley–Taylor, Makkink and Turc) and daily scale (Penman–Monteith, Blaney and Criddle, Hargreaves, Pristley–Taylor, Makkink and Turc), was evaluated against scintillometer measurements collected during six month in 2005 in an experimental plot maintained under “reference” conditions (alfalfa crop). The daily values of ET 0 obtained with the examined methodologies were then used as input in the FAO-56 agro-hydrological model, in order to evaluate, for an olive grove in a Mediterranean environment, the impact on simulated actual evapotranspiration. The experiment was carried out in South-West Sicily, in an area where olive groves are the major crop. The comparison between estimated and measured fluxes confirmed that FAO-56 Penman–Monteith (PM) standardized equation is characterized by the lowest mean bias error (−0.15 mm d −1 and 0.06 mm d −1 using daily or hourly data, respectively). Additionally, the analysis also highlighted that the Pristley–Taylor equation can be considered a valid alternative for an accurate estimation of ET 0 (mean bias error of 0.35 mm d −1 and 0.43 mm d −1 using daily or hourly data, respectively). The application of the FAO-56 water balance model on the investigated olive grove evidenced that the best estimations of actual evapotranspiration are obtained when the Pristley–Taylor ET 0 data are used as input, confirming that this approach can be considered a valid alternative to the standard Penman–Monteith.

The paper critically addresses the origins of flexicurity and argues that it lacks an archetypical definition, especially in the formulation of the EU Commission. Hence, the paper, basing on a multidisciplinary literature, considers flexicurity as any balance between flexibility and security and, therefore, proposes ordering any set of contracts, providing the same balance and with the same regulatory framework, in “communities”. It is assumed, therefore, that communities can differ either in terms of a “protective” trade-off, where the differential is not a surrogate measure of security, or in terms of an economic trade-off, where it is met by the provision of social insurance or security. One of these sets is called community 0 and it corresponds to undeclared work, not only illegal, but also completely devoid of security and fully flexible. After identifying from ILO, EU and constitutional sources the foundation of the “incompressibility” of rights which guarantee decent work, the paper likens decent work to a public good of general interest, in the same way as laws generally recognize the natural environment. On the basis of this comparative axiom, the paper proposes considering the dispersion of security produced by undeclared work as “un-decent” work and, therefore, as a form of “pollution”. Because an environment can be little or very polluted, the paper proposes considering as social pollution any form, even legal, of security leakage - such as that induced by the precarious and atypical jobs. Any form of employment is, therefore, considered in an nth community and every community is ordered from the least secure to the most secure, using as tertium comparationis standard employment, which is itself a point of balance between flexibility and security, and it is therefore a community of flexicurity. In this way, each community expresses a degree of social participation in environmental pollution: from the maximum produced by undeclared work to the minimum produced by labour standard. The adopted economic approach allows defining this pollution as a negative externality and, therefore, refer to its contrast in terms of internalization. Among the techniques of internalization, the preferred one is the Pigovian tax, because it can overcome the difficulties associated with the identification of taxable income in the undeclared work and in the informal sector. It has been observed, in fact, that the insurance mechanism creates a regressive effect on the competitiveness of labour standards, making it less competitive in favour of precarious and atypical work and, thus, triggering a vicious cycle that increases social pollution. In this way, it is believed that on one hand you lose your interest in hiding most of the black job. On the other hand, a mechanism would be enforced that forces polluters to contribute to the financing of the security needed to address the pollution created. Because of the adopted ordering of communities, this positive effect would also impact on precarious forms of employment and atypical work in proportion to the security dispersed

Two regionalized models for the distributed estimation of daily reference evapotranspiration, the temperature-based Hargreaves (HE) and the radiation-based Makkink (MK) equations, are applied in Southern Italy during the years 2007 and 2008. Spatially distributed meteorological inputs, such as air temperature and incoming solar radiation, were derived from geostatistical interpolation of ground data and from the Land Surface Analysis Satellite Application Facility (LSA-SAF) surface radiation product, respectively. Comparison of the latter with 83,394 daily measurements provided by 128 weather stations shows a not negligible seasonal error in daily solar radiation that is corrected by means of a periodic equation. A preliminary local calibration of the MK coefficient highlights its strong dependency on the interactions between moist winds from the Atlantic Ocean and orographic obstructions, leading to two western and eastern subzones. Hence, a regionalization of the MK-adjusted coefficient was performed following a procedure similar to the one already used by the authors in a previous work for the HE coefficient. Application of both regionalized models and their comparison with Penman-Monteith estimates derived from the same stations leads to average whole-year absolute errors of approximately 0.5 mm d-1, further showing the great potential of the MK method in terms of informative content and less dependence on the site density of a ground-based monitoring network. Overall, discussing pros and cons of both regionalized models, it is shown that their integrated use in southern Italy is possible and advisable.

According to the opinion accepted by most, labour law was born in the late nineteenth century in connection with the production processes delivered by the Industrial Revolution. Its genesis follows the paradigm for which is the main feature of this new production model to generate both socioeconomic and legal subordination. So, keeping this basic assumption, a research that wanted to investigate the origins of the employment, back-links from this period, it seems to stand outside of the legal framework that constitute generally its reference system. For the same reason, also the new post-industrial work organisation in the era of globalisation, although for different reasons and yet paradoxical, it tends to stand outside the natural riverbed of labor law and it tends to breaking free from it. This is the reason why there is the current tendency to talk about the labor market law, jobs law, job protections, rather than labour law and employment law. You can not escape that in every age, however, the concern of the law has been, and it always is, to assign the protection to who, by himself, that protection can not give it to himself. Well, this situation is an essential common need of the labour law both pre-industrial and industrial and post-industrial. Thus, the basic concerns of labour law in the era of globalisation are not different from those of previous eras. Let's change the superstructure of utilisation / exploitation of the labor of others - and correspondingly the legal structures that govern them - but it do not change the structures on which those forms are inserted; - in fact, at the root of it all there is the person, in one of its many most qualifying natural phenomena: that of work. Now, the Bible (both the Hebrew and Christian, in its different denominations) is - of course - a common humus to the whole so called the West and - in part - even to the Islam. As you know, the inextricable intertwining of theological requirements with social requirements, that are typical of theocratic societies, on the one side whether it does not make it easy to distinguish the one from the other (even supposing that such hermeneutic approach it can be useful and accessible); on the other side it might help to identify protection structures that, as referring to man in his relationship with creation - ( in the secular sense for non-believers ) and the creator - could likely to be erected to universal rules, without space or time, rules good to delineate the outer limits of regulation of employment at any time and any where. The purpose of this research is to catalogue the biblical texts - notably in a first phase those which are in the first (or old) testament of the Christian Bible - which contain both prescriptive structures and pathways, designed to protect the position of social weakness and minority of the worker, understood in its broadest sense and in its various and diverse facets: of worker, of salaried, of servant, even of slave, and so on. The starting point and most immediate objective of this work is therefore to find the biblical sources - and to get ready one first critical apparatus - which they refer to, directly or indirectly, to work in broad sense, that is a personal relationship in which one of the two subjects of it, is in a position of weakness, comparable to that which the Bible considers typical for orphans , widows, the poor and in some respects for foreigners: a one word the Weaks.

The paper, basing on a multidisciplinary literature, considers flexicurity as any balance between flexibility and security and, therefore, proposes ordering any set of work-relationship, providing the same balance and with the same regulatory framework, in “communities”. It is assumed, therefore, that communities can differ either in terms of a “protective” trade-off, where the differential is not a surrogate measure of security, or in terms of an economic trade-off, where it is met by the provision of social insurance or security. One of these sets is called community 0 and it corresponds to undeclared work, not only illegal (e.g. informal), but also completely devoid of security and fully flexible. After identifying from ILO, EU and constitutional sources the foundation of the “incompressibility” of rights which guarantee decent work, the paper likens decent work to a public good of general interest, in the same way as laws generally recognize the natural environment. On the basis of this comparative axiom, the paper proposes considering the dispersion of security produced by undeclared and informal work as “un-decent” work and, therefore, as a form of “pollution”. Because an environment can be little or very polluted, the paper proposes considering as social pollution any form, even legal, of security leakage - such as that induced by the informal, the precarious jobs. Any form of labour relationship is, therefore, considered in an nth community and every community is ordered from the least secure to the most secure, using as tertium comparationis standard employment. In this way, each community expresses a degree of social participation in environmental pollution. Defining this pollution as a negative externality and, therefore, refer to its contrast in terms of internalization. Among the techniques of internalization, the preferred one is the Pigovian tax, because it can overcome the difficulties associated with the identification of taxable income in the undeclared work and in the informal sector. It has been observed, in fact, that the insurance mechanism creates a regressive effect on the competitiveness of labour standards, making it less competitive in favour of precarious and atypical work and, thus, triggering a vicious cycle that increases social pollution. In this way, it is believed that on one hand you lose your interest in hiding most of the black job. On the other hand, a mechanism would be enforced that forces polluters to contribute to the financing of the security needed to address the pollution created.