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Analysis of the current drought in Andalusia with various indices
No full textResumen de la ponencia presentada en: XXXVI Jornadas Científicas de la AME y el XXII Encuentro Hispano Luso de Meteorología celebrado en Cádiz y San Fernando del 13 al 15 de marzo de 2024.The current drought in Andalusia, due to its extraordinary duration and intensity, is very appropriate to compare
the treatment of the different drought indicators, both those that only depend on precipitation and the Normalized
Precipitation Drought Index (SPI). , prepared by T.B. McKee, N.J. Doesken and J. Kleinst, from Colorado State
University, in 1993, recommended by the World Meteorological Organization and used as an early warning system
by many National Meteorological Services, at their different time integration scales, as well as others that include
additional related variables with the storage capacity and demand for soil moisture, very important with the
increase in temperatures due to climate change and which are reaching very significant values in the south of
Spain. In this sense, the Palmer index is very suitable for analyzing and quantifying drought conditions in
Andalusia
Potential SST drivers for chlorophyll-a variability in the Alboran sea: a source for seasonal predictability?
No full textResumen de la ponencia presentada en: XXXVI Jornadas Científicas de la AME y el XXII Encuentro Hispano Luso de Meteorología celebrado en Cádiz y San Fernando del 13 al 15 de marzo de 2024.This study investigates the link between climate modes of the sea surface temperature (SST) and the surface
chlorophyll-a (Chl-a) concentration in spring along the northern flank of the Alboran Sea. To this aim, surface
satellite-derived products of SST and Chl-a, together with atmospheric satellite variables, are used. Our results
indicate that both the tropical North Atlantic and ENSO affect the distribution of Chl-a through the alteration of
the usual upwelling taking place in northern Alboran in spring. Furthermore, the related SST signals might be
used as predictors of this Chl-a response. In particular, during the El Niño/La Niña years, the Chl-a signal can
be robustly predicted with 4 months in advance. On the other hand, the tropical North Atlantic SSTs allow to
significantly predict, up to 7 months in advance, the Chl-a concentration in spring offshore. The results presented
here could contribute to develop a future seasonal forecasting tool of upwelling variability and living marine
resources in northern Alboran
Levante and poniente winds in the Strait of Gibraltar through COSMO-REA6 high-resolution reanalysis
No full textResumen de la ponencia presentada en: XXXVI Jornadas Científicas de la AME y el XXII Encuentro Hispano Luso de Meteorología celebrado en Cádiz y San Fernando del 13 al 15 de marzo de 2024.Regional winds are small-scale processes, both spatial (hundreds of kilometers or less) and temporal (seconds to
days). Among them, Levante and Poniente acquire great importance in the Strait of Gibraltar because of its
orographic and synoptical properties. Due to the scarcity of meteorological observations, a high-resolution
reanalysis, such as COSMO-REA6 (6 kilometers), could strongly help study these processes. A definition of
Levante and Poniente has been developed through wind direction and speed criteria. Statistical results from
COSMO-REA6 have been compared with observations from the HadISD database (Met Office) in the period
(2000-2018). These winds appear in the Strait of Gibraltar about 30% of the days, although not at the same time,
with extensions around 21,600 square kilometers that vary by 16,200 square kilometers throughout the year. They
also have annual cycles with maximums in winter and minimums in summer
Optical Properties of North Atlantic Aerosols Through a compact dual-wavelength depolarization Lidar Observations
Get PDFWe present a characterization of the optical properties of different aerosol types based on data collected using a compact dual-wavelength depolarization elastic lidar (532 and 808 nm, CIMEL CE376). We evaluate the vertical distribution and temporal evolution of a variety of aerosols observed in the subtropical North Atlantic region, covering from Saharan dust outbreaks and volcanic aerosols to fresh and aged wildfires, observed between August 2021 and August 2023, using a modified two-wavelength Klett inversion method to derive the aerosol backscatter and extinction coefficients from CE376 lidar observations. We assessed the performance of the CE376 lidar during an intercomparison campaign with an MPL-4B lidar (MPLNET) while collocated at the facilities of the Izaña Atmospheric Research Centre (Canary Islands, Spain). Both instruments depicted the vertical aerosol structure similarly. The main differences were attributed to errors arising from the determination of the overlap function and the depolarization calibration in each instrument and the larger effect of the solar background on the CE376 system during daylight.Action under the ACTRIS 683 grant (agreement no. 871115)
Recuperando la memoria de Lise Meitner, la científica que descubrió la fisión nuclear (Viena 1878 – Cambridge 1968)
Get PDFLa disminución del tiempo que dura la hibernación en la lagartija verdosa (Podarcis virescens) está directamente relacionada con la reducción del periodo con heladas en el centro peninsular
No full textGiant hail in Spain, was it climate change?
No full textResumen de la ponencia presentada en: XXXVI Jornadas Científicas de la AME y el XXII Encuentro Hispano Luso de Meteorología celebrado en Cádiz y San Fernando del 13 al 15 de marzo de 2024.Large hailstorms remain Europe's primary severe weather threat, classified by size as large (5-7 cm), very large (7-9 cm), and giant (> 10 cm). Spain has recorded only 5 giant hail events, 3 in the last two years. A giant hailstorm hit Girona on August 30, 2022, with hail reaching a record 12 cm, causing significant damage and the first hail-related fatality in Europe in 20 years. The synoptic setup included a quasi-omega blocking pattern and a depression over France, inducing a short-wave trough in the northeastern Iberian Peninsula. This, along with a thermal low and Mediterranean marine heatwave, favored vorticity advection and moisture influx. The study attributes the giant hail event to anthropogenic climate change and a marine heatwave, analyzing it with the pseudo-global warming approach. The WRF-ARW model showed under preindustrial or non-heatwave conditions, the hail event would have been less severe. This method could help attribute such events to climate change