A5004852965- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Advanced Optical Sensing Technologies
- Advanced Sensor Technologies Research
- Meteorological Phenomena and Simulations
- Analytical Chemistry and Sensors
- T-cell and B-cell Immunology
- Geophysics and Gravity Measurements
- Spectroscopy and Laser Applications
- Acute Lymphoblastic Leukemia research
- Advanced Fiber Laser Technologies
- Aeolian processes and effects
- Air Quality Monitoring and Forecasting
- Semiconductor Lasers and Optical Devices
- Remote Sensing and LiDAR Applications
- Immune Cell Function and Interaction
- Hematopoietic Stem Cell Transplantation
- Flow Measurement and Analysis
- Plant Surface Properties and Treatments
- Advanced Fiber Optic Sensors
- Ovarian cancer diagnosis and treatment
- Thermal Regulation in Medicine
- Down syndrome and intellectual disability research
- Extracellular vesicles in disease
Universitat Politècnica de Catalunya
2010-2024
Barcelona Supercomputing Center
2021-2024
Instituto de Investigación Biomédica de Salamanca
2024
Centro de Investigación Biomédica en Red de Cáncer
2024
Abstract. The annual and seasonal variability of aerosol optical properties observed by means a Raman lidar over Northeastern Spain has been assessed. representativeness first checked against sun-photometer measurements in terms thickness. Then the cycle planetary boundary layer thickness its fraction compared to columnar thickness, ratio, backscatter-related Ångström exponent height are analyzed discussed. Winter summer mean profiles extinction, backscatter ratio retrieved with algorithm...
Abstract. This paper presents a new application of assimilating lidar signals to aerosol forecasting. It aims at investigating the impact ground-based network on analysis and short-term forecasts aerosols through case study in Mediterranean basin. To do so, we employ data assimilation (DA) algorithm based optimal interpolation method developed Polair3D chemistry transport model (CTM) Polyphemus air quality modelling platform. We assimilate hourly averaged normalised range-corrected (PR2)...
Abstract. In the framework of ACTRIS (Aerosols, Clouds, and Trace Gases Research Infrastructure Network) summer 2012 measurement campaign (8 June–17 July 2012), EARLINET organized performed a controlled exercise feasibility to demonstrate its potential perform operational, coordinated measurements deliver products in near-real time. Eleven lidar stations participated which started on 9 at 06:00 UT ended 72 h later 12 UT. For first time, single calculus chain (SCC) – common developed within...
An extremely fresh smoke plume (<5 h) was transported over Barcelona on 23 July 2009, just 5 h after an intense Saharan dust event finalized. Both events were observed by sun-photometer, lidar and satellite systems. Results indicate surprisingly large absorption of mixed particles (SSA ∼ 0.83 ± 0.04) with lower SSA than that for (0.86 at 440 nm. Our investigation shows may have during their transport anthropogenic particles. Dust layers are between 1–6 1–4 km, associated ratios 532 nm 51 36...
The lidar data-inversion algorithm widely known as the Klett method (and its more elaborate variants) has long been used to invert elastic-lidar data obtained from atmospheric sounding systems. backward also shown be robust in face of uncertainties concerning boundary condition. Nevertheless electrical noise at photoreceiver output unavoidably an impact on process, and describing explicit way how it affects retrieval optical coefficients can contribute improvement inversion quality. We...
Hospitals are a fundamental component of country's health system and considered essential facilities for dealing with the consequences natural disasters. Nevertheless, hospitals may be highly vulnerable structures. Despite importance these facilities, many have resulted severely damaged, some them lost functionality even when subject to moderate earthquakes. In order better understand impact influence seismic performance non-structural components systems on loss function, this paper presents...
Relative humidity (RH) profiling using Raman lidars requires simultaneous range-resolved temperature and pressure data that are not always available. We propose assess a method based on the use of locally retrieved atmospheric model to estimate profiles. This relies from daily radiosonde launches at Barcelona during five-year-long period (2015–2019). have computed error compared with “true” Then, we calculated induced uncertainty in recalculated RH profiles, finding standard deviation 5 km...
Among the different techniques available for measuring atmospheric water vapor content, Raman lidars stand out as accurate instruments providing detailed profiles with high temporal and altitude resolution. Their principle is based on obtaining range-resolved ratio of lidar signals corresponding to returns from nitrogen molecules, which proportional mixing ratio. To do this, it necessary determine a calibration factor, specific each instrument. A method this parameter, zenith measurements...
A two-component laser Doppler velocimeter (2D-LDV) prototype for surface-displacement measurement is presented. The system proposed based on the differential technique with a backwardscattering configuration. reference and two frequency-shifted probe beams are generated departing from single beam by means of beamsplitters acousto-optic modulators. This configuration has advantage using single-wavelength source detector system, while permitting sign detection vector components velocity in...
This article is aimed at describing the technology, system architecture and specifications of a new 3D Nd:YAG scanning lidar. Main features are interspersed low-range far-range exploration, open user-configuration tools specific architectural design based on parallel CPU control, LabView user interface digitally controlled optoelectronic receiver. The latter provides key advantages to whole such as calibration lidar returns in terms absolute power repeatability. Issues concerning...
Abstract. In the framework of ACTRIS summer 2012 measurement campaign (8 June–17 July 2012), EARLINET organized and performed a controlled exercise feasibility to demonstrate its potential perform operational, coordinated measurements deliver products in near-real time. Eleven lidar stations participated which started on 9 at 06:00 UT ended 72 h later 12 UT. For first time Single-Calculus Chain (SCC), common calculus chain developed within for automatic evaluation data from raw signals up...
It is known that the retrieval of aerosol extinction and backscatter coefficients from lidar data acquired through so-called total-power channels – intended to measure backscattered power irrespective polarization can be adversely affected by varying depolarization effects produced under measurement. This effect particularly noticeable in advanced multiwavelength systems, where different wavelengths are separated using a system dichroic beam splitters, because general reflection transmission...
The minimum number of samples that must be taken from a sinusoidal signal affected by white Gaussian noise, in order to find its frequency with predetermined maximum error, is derived.This analysis interest evaluating the performance velocity-measurement systems based on Doppler effect.Specifically, laser anemometry (LDA) it usual receive bursts poor signal-to-noise ratio, yet high accuracy required for measurement.In recent years special attention has been paid problem monitoring temporal...
Lidar (radar laser) systems take advantage of the relatively strong interaction between laser light and aerosol/molecular species in atmosphere. The inversion optical atmospheric parameters is prime concern fields environmental meteorological modelling has been (and still is) under research study for past four decades. Within framework EARLINET (European Aerosol LIdar NETwork), independent inversions extinction backscatter profiles thus, lidar ratio, as well) have possible by assimilating...