Jordi Cristóbal Rosselló

IRTA Institute of Agrifood Research and Technology | IRTA · Efficient Use of Water Programme

The large-scale quantification of accurate evapotranspiration (ET) time series has substantially been developed in recent decades using automated approaches based on remote sensing data. However, there are still several model-related uncertainties that require precise assessment. In this study, the Surface Energy Balance Algorithm for Land (SEBAL)...

Doñana National Park is located in the southwest of the Iberian Peninsula, where water scarcity is recurrent together with high heterogeneity in species and ecosystems. In this work, a first evaluation of the modeling of water and energy fluxes as well as carbon assimilation (Gross Primary Production, GPP) with flux tower data is performed. Energy...

Doñana National Park is located in the southwest of the Iberian Peninsula, where water scarcity is recurrent together with high heterogeneity in species and ecosystems. The CO2 fixation by plants is given by the Gross Primary Production (GPP) and upscaling in situ estimates in these areas is challenging for regional and global studies, given the si...

Phenology observations are essential indicators to characterize the local effects of climate change. Citizen participation in the collection of phenological observations is a potential approach to provide data at both high temporal scale and fine grain resolution. Traditional observation practices of citizen science, although precise at the species...

Energy and CO2 fluxes computing are essential to improve the knowledge of the hydrological cycle, especially in natural vegetation covers. In this work, the first results of the modeling of energy fluxes through the TSEB model and carbon assimilation (GPP) through a LUE model using Terra/Aqua MODIS images during the period 2014-2015, in an experime...

A pilot study for mapping the Arctic wetlands was conducted in the Yukon Flats National Wildlife Refuge (Refuge), Alaska. It included commissioning the HySpex VNIR-1800 and the HySpex SWIR-384 imaging spectrometers in a single-engine Found Bush Hawk aircraft, planning the flight times, direction, and speed to minimize the strong bidirectional refle...

Recent Arctic warming has led to changes in the hydrological cycle. Circum-Arctic and circumboreal ecosystems are showing evidence of “greening” and “browning” due to temperature warming leading to shrub encroachment, tree mortality and deciduousness. Increases in latent heat flux from increased evapotranspiration rates associated with deciduous-do...

Monitoring of evapotranspiration (ET) has important implications for global and regional climate modeling, enhancing the knowledge of the hydrological cycle and assessing water stress affecting agricultural and natural ecosystems. Nowadays, remote sensing is the only technology capable of providing the necessary radiometric measurements for the cal...

Sierra Nevada is the southern-most European mountain still containing alpine permafrost and small rock glaciers that are vestiges of the Little Ice Age. Thawing of these ice remnants is mainly controlled by the shield effect of snow cover and its surface temperature (LST), and thermal changes in permafrost areas are strongly related to air temperat...

The Arctic has become generally a warmer place over the past decades leading to earlier snow melt, permafrost degradation and changing plant communities. Increases in precipitation and local evaporation in the Arctic, known as the acceleration components of the hydrologic cycle, coupled with land cover changes, have resulted in significant changes...

Surface air temperatures in the Arctic have shown a significant increase especially in the past few decades. Arctic amplification, referring to more rapid increases in air temperatures in the Arctic compared to other parts of the globe, is causing widespread melting of snow and ice, sea-ice retreat and a rise in the global sea level, increases in p...

Land surface temperature (LST) is one of the sources of input data for modeling land surface processes. The Landsat satellite series is the only operational mission with more than 30 years of archived thermal infrared imagery from which we can retrieve LST. Unfortunately, stray light artifacts were observed in Landsat-8 TIRS data, mostly affecting...

The use of Pseudoinvariant Areas (PIA) makes it possible to carry out a reasonably robust and automatic radiometric correction for long time series of remote sensing imagery, as shown in previous studies for large data sets of Landsat MSS, TM, and ETM+ imagery. In addition, they can be employed to obtain more coherence among remote sensing data fro...

The Arctic has become generally a warmer place over the past decades leading to earlier snow melt, permafrost degradation and changing plant communities. Increases in precipitation and local evaporation in the Arctic, known as the acceleration components of the hydrologic cycle, coupled with land cover changes, have resulted in significant changes...

Alaska's Arctic and boreal regions, largely dominated by tundra and boreal forest, are witnessing unprecedented changes in response to climate warming. However, the intensity of feedbacks between the hydrosphere and vegetation changes are not yet well quantified in Arctic regions. This lends considerable uncertainty to the prediction of how much, h...

The terrestrial water cycle contains large uncertainties that impact our understanding of water budgets and climate dynamics. Water storage is a key uncertainty in the boreal water budget, with tree water storage often ignored. The goal of this study is to quantify tree water content during the snowmelt and growing season periods for Alaskan and we...

The Arctic has become generally a warmer place over the past decades leading to earlier snow melt, permafrost degradation and changing plant communities. Increases in precipitation and local evaporation in the Arctic, known as one of the acceleration components of the hydrologic cycle, coupled with land cover changes, have resulted in significant c...

The computation of turbulent fluxes of heat, momentum, and greenhouse gases requires measurements taken at high sampling frequencies. An important step in this process involves the detection and removal of sudden, short-lived variations that do not represent physical processes and that contaminate the data (i.e., spikes). The objective of this stud...

A surface probe method previously developed was used to detect hotspots and to determine spatial variation of methane (CH4) emissions from three landfills located in Mexico, with an intermediate or a final cover, as well as with or without a landfill gas collection system. The method was effective in the three landfills and allowed mapping of CH4 e...

Extensive stock-breeding systems developed in mountain areas like the Pyrenees are crucial for local farming economies and depend largely on above-ground biomass (AGB) in the form of grass produced on meadows and pastureland. In this study, a multiple linear regression analysis technique based on in-situ biomass collection and vegetation and wetnes...

We evaluate local differences in thermal regimes and turbulent heat fluxes across the heterogeneous canopy of a black spruce boreal forest on discontinuous permafrost in interior Alaska. The data were taken during an intensive observing period in the summer of 2013 from two micrometeorological towers 600 m apart in a central section of boreal fores...

The importance of land surface temperature (LST) retrieved from high to medium spatial resolution remote sensing data for many environmental studies, particularly the applications related to water resources management over agricultural sites, was a key factor for the final decision of including a thermal infrared (TIR) instrument on board the Lands...

Evaporation and transpiration are the two main processes involved in water transfer from vegetated and non-vegetated areas to the atmosphere. Evapotranspiration (ET) from the Earth's vegetation constitutes 88% of the total terrestrial ET, and returns more than 50% of terrestrial precipitation to the atmosphere; therefore it plays a key role in both...

Radiometric correction is a prerequisite for generating high-quality scientific data, making it possible to discriminate between product artefacts and real changes in Earth processes as well as accurately produce land cover maps and detect changes. This work contributes to the automatic generation of surface reflectance products for Landsat satelli...

It's time for a crisper image of the Face of the Earth: Landsat and climate time series for massive land cover & climate change mapping at detailed resolution. Combining climate dynamics and land cover at a relative coarse resolution allows a very interesting approach to global studies, because in many cases these studies are based on a quite high...

Global studies combining climate dynamics and land cover are usually performed at a relatively coarse spatial resolution. This allows a very interesting approach, especially because in many cases these studies are based on a quite high temporal resolution, but they may be limited in large areas like the Mediterranean. Indeed, areas with a complex h...

Accelerations in the flow over forests generate coherent structures which locally enhance updrafts and downdrafts, forcing rapid exchanges of energy and matter. Here, observations of the turbulent flow are made in a highly heterogeneous black spruce boreal forest in Fairbanks, Alaska at ~2.6 h (12 m) and ~0.6 h (3 m), where h is the mean canopy hei...

Land use/cover classification is a key research field in remote sensing and land change science as thematic maps derived from remotely sensed data have become the basis for analyzing many socio-ecological issues. However, land use/cover classification remains a difficult task and it is especially challenging in heterogeneous tropical landscapes whe...

Climate warming may accelerate the hydrological cycle as a result of enhanced evaporative demand in some regions where water is not limiting. However, the combination of warmer temperatures with constant or reduced precipitation in other regions may lead to a large decrease in water availability for natural and agricultural systems as well as for h...

Solar radiation plays a key role in the Earth's energy balance and is used as an essential input data in radiation-based evapotranspiration (ET) models. Accurate gridded solar radiation data at high spatial and temporal resolution are needed to retrieve ET over large domains. In this work we present an evaluation at hourly, daily and monthly time s...

Climate warming may accelerate the hydrological cycle as a result of enhanced evaporative demand in some regions where water is not limiting. However, the combination of warmer temperatures with constant or reduced precipitation in other regions may lead to a large decrease in water availability for natural and agricultural systems as well as for h...

Evapotranspiration (ET) is a critical component of the hydrologic cycle in interior Alaska, being about 74% of summer precipitation or 50% of annual precipitation, and is a process that will become more important as we witness increasing trends of climate warming, permafrost degradation, forest fire occurrences, and significant land cover changes....

NASA's decadal survey report has recommended a series of planned satellite missions, such as Soil Moisture Active Passive (SMAP) and Hyperspectral Infrared Imager (HyspIRI) . In parallel, the European Space Agency (ESA) is working toward the launch on new earth observing satellite missions such as the Sentinel series and EnMAP. These, along with a...

Solar radiation plays a key role in the Earth's energy balance and is used as an essential input data in radiation-based evapotranspiration (ET) models. Accurate gridded solar radiation data at high spatial and temporal resolution are needed to retrieve ET over large domains. In this work we present an evaluation at hourly, daily and monthly timest...

On 2002, a novel initiative was undertaken by the local water administration of Catalonia (the Agència Catalana de l'Aigua) and the Universitat Autònoma de Barcelona, leading to a ten-year project where a high number of medium resolution satellite images (MODIS and Landsat) were integrated to the daily water management to improve decision making ef...

Pyrenean regions have undergone deep changes in the past 50 years. These changes have affected their socioeconomic structures, leading to a shift in land management, which is eventually reflected on the landscape. Two opposite processes are found throughout the mountain range: abandonment and intensification. Land abandonment results from a shift i...