A5075643007- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Solar Radiation and Photovoltaics
- Air Quality Monitoring and Forecasting
- Calibration and Measurement Techniques
- Meteorological Phenomena and Simulations
- Impact of Light on Environment and Health
- Urban Heat Island Mitigation
- Indoor Air Quality and Microbial Exposure
- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- Allergic Rhinitis and Sensitization
- High Altitude and Hypoxia
- Precipitation Measurement and Analysis
- Vehicle emissions and performance
- Image Enhancement Techniques
- Adipose Tissue and Metabolism
- Lichen and fungal ecology
- Infrared Target Detection Methodologies
- Diet, Metabolism, and Disease
- Earthquake Detection and Analysis
- Icing and De-icing Technologies
Instituto Andaluz de Ciencias de la Tierra
2016-2025
Universidad de Granada
2016-2025
Junta de Andalucía
2007-2024
Instituto Nacional de Enfermedades Neoplásicas
1960-2015
Agencia de Medio Ambiente y Agua de Andalucía
2009-2014
University of California, San Diego
2012-2013
Mediterranean Center for Environmental Studies
2011-2013
Universidad Peruana Cayetano Heredia
1976-1993
University of Chicago
1958
Action at a Distance Snowfall in the Sierra Nevada provides large fraction of water that California receives as precipitation. Knowing what factors influence amount snow falls is thus critical for projecting how availability may change future. Aerosols have an important effect on cloud processes and Creamean et al. (p. 1572 , published online 28 February) found dust biological aerosols originating from far away Sahara facilitate ice nuclei formation ice-induced precipitation show articles...
Based on a CCD camera, we have developed an in-house sky imager system for the purpose of cloud cover estimation and characterization. The captures multispectral image every 5 min, analysis is done with method based optimized neural network classification procedure genetic algorithm. discriminates between clear two classes: opaque thin clouds. It also divides into sectors finds percentage clouds in those different regions. We validated algorithm levels: level, using observations included...
Abstract. Estimating the aerosol contribution to global or regional radiative forcing can take advantage of relationship between spectral optical properties and size chemical composition aerosol. Long term measurements from observational networks satellites be used in such studies. Using in-situ mixing state help us constrain limitations estimates. In this study, Absorption Ångström Exponent (AAE) Scattering (SAE) derived 10 operational AERONET sites California are combined for deducing...
Abstract. Digital images of the sky obtained using a total imager (TSI) are classified pixel by into clear sky, optically thin and thick clouds. A new classification algorithm was developed that compares red-blue ratio (RBR) to RBR library (CSL) generated from captured on days. The difference, rather than ratio, between CSL resulted in more accurate cloud classification. High correlation TSI image aerosol optical depth (AOD) measured an AERONET photometer observed motivated addition haze...
Abstract. The interest in the use of ceilometers for optical aerosol characterization has increased last few years. They operate continuously almost unattended and are also much less expensive than lidars; hence, they can be distributed dense networks over large areas. However, due to low signal-to-noise ratio it is not always possible obtain particle backscatter coefficient profiles, vast number data generated require an automated unsupervised method that ensures quality profiles...
Abstract. Given the need for accurate knowledge of aerosol microphysical and optical properties with height resolution, various algorithms combining vertically resolved column-integrated information have been developed in last years. Here we present new results extensive (backscattering, scattering extinction) volume concentrations retrieved GRASP (Generalized Retrieval Aerosol Surface Properties) algorithm over a 3-year period. The range-corrected signal (RCS) at 1064 nm measured ceilometer...
Abstract. This paper proposes a method to obtain spectral sky radiances, at three wavelengths (464, 534 and 626 nm), from hemispherical images. Images are registered with the All-Sky Imager installed Andalusian Center for Environmental Research (CEAMA) in Granada (Spain). The methodology followed this work absolute calibration radiance of instrument is based on comparison its output measurements modelled radiances derived LibRadtran/UVSPEC radiative transfer code under cloud-free conditions....
This investigation focuses on the characterisation of aerosol particle hygroscopicity. Aerosol optical properties were measured at Granada, Spain, during winter and spring seasons in 2013. Measured included light-absorption coefficient (σap) light-scattering (σsp) dry conditions relative humidity (RH) 85±10%. The scattering enhancement factor, f(RH=85%), had a mean value 1.5±0.2 1.6±0.3 for campaigns, respectively. Cases high more frequent campaign with 27% f(RH=85%) values above 1.8, while...
Three volcanic plumes were detected during the Tajogaite volcano eruptive activity (Canary Islands, Spain, September–December 2021) over Iberian Peninsula. The spatiotemporal evolution of these events is characterised by combining passive satellite remote sensing and ground-based lidar sun-photometer systems. inversion algorithm GRASP used with a suite instruments such as lidar/ceilometer from eight sites at different locations throughout Satellite observations showed that ash remained...
This study presents the interannual CO 2 exchange of a semiarid shrubland overlying carbonaceous substrate where abiotic processes may interact with biological in ecosystem carbon cycle. Estimated by eddy covariance technique and two different gap‐filling models (RBF neural network MDS “Marginal Distribution Sampling”), mean annual net (NEE) varied from −63 to 29 g C m −2 , averaging ± 23 May 2004 December 2007. In addition, was divided into periods likely dominated clear signals activity...
Wind-dispersed pollen grains emitted from vegetation are directly injected into the atmosphere being an important source of natural aerosols globally. These coarse particles can rupture smaller particles, known as subpollen (SPPs), that may act cloud condensation nuclei (CCN) and affect climate. In this study, we characterize investigate ability SPPs 10 Mediterranean-climate types to activate CCN. A continuous flow CCN counter (CCNC) was used measure activation size-selected (80, 100 200 nm...