11 research outputs found
Influences of synoptic situation and teleconnections on fog-water collection in the Mediterranean Iberian Peninsula, 2003-2012
Fog-water collection has been widely analysed for its quantification and potential uses; however, there are few studies assessing the synoptic conditions and largescale teleconnection patterns that affect its occurrence. Focusing on the Mediterranean Iberian Peninsula, this work aims to analyse the synoptic patterns, both at surface level and 850 hPa geopotential height, that most likely to favour fogwater collection, and to quantify the relationship between fog-water collection and the NAOi (North Atlantic Oscillation index), MOi (Mediterranean Oscillation index) as well as WeMOi (Western Mediterranean Oscillation index) teleconnection patterns. For this purpose, daily fog-water observations from a dense network of 23 fog-water collectors located along the Mediterranean Iberian Peninsula for 2003-2012 were analysed in relation to synoptic patterns and the threeteleconnection indices. The major findings are: (a) The most favourable synoptic patterns for fog-water collection are maritime advections carrying humidity from the Mediterranean basin, and cyclonic circulations, whereas anti-cyclonic situations generally led to large number of foggy days with low fog-collection rates. (b) In terms of winds at 850 hPa, the most favourable low-level flows for fogwater collection are associated with strong winds (>5.1 m sâ1) from theMediterranean. Atlantic winds generally cause a greater number of fog days than Mediterranean winds, with less fog-water collection rates. (c) WeMOi has the greatest influence on fog-water collection, mainly during winter and spring months, with statistically significant negative relationships for most of the stations. MOi also shows a great influence, with a large number of statistically significant negative correlations, mainly during the same months as WeMOi. Lastly, NAOi presented the lowest and no significant negative correlations with fog-water collection
La influencia del clima en la variacion espacial del pinar de Tenerife (I.CanĂĄrias)
info:eu-repo/semantics/publishedVersio
Influences of synoptic situation and teleconnections on fog-water collection in the Mediterranean Iberian Peninsula, 2003â2012
Fog-water collection has been widely analysed for its quantification and potential uses; however, there are few studies assessing the synoptic conditions and large-scale teleconnection patterns that affect its occurrence. Focusing on the Mediterranean Iberian Peninsula, this work aims to analyse the synoptic patterns, both at surface level and 850 hPa geopotential height, that most likely to favour fog-water collection, and to quantify the relationship between fog-water collection and the NAOi (North Atlantic Oscillation index), MOi (Mediterranean Oscillation index) as well as WeMOi (Western Mediterranean Oscillation index) teleconnection patterns. For this purpose, daily fog-water observations from a dense network of 23 fog-water collectors located along the Mediterranean Iberian Peninsula for 2003â2012 were analysed in relation to synoptic patterns and the three-teleconnection indices. The major findings are: (a) The most favourable synoptic patterns for fog-water collection are maritime advections carrying humidity from the Mediterranean basin, and cyclonic circulations, whereas anti-cyclonic situations generally led to large number of foggy days with low fog-collection rates. (b) In terms of winds at 850 hPa, the most favourable low-level flows for fog-water collection are associated with strong winds (>5.1 m s) from the Mediterranean. Atlantic winds generally cause a greater number of fog days than Mediterranean winds, with less fog-water collection rates. (c) WeMOi has the greatest influence on fog-water collection, mainly during winter and spring months, with statistically significant negative relationships for most of the stations. MOi also shows a great influence, with a large number of statistically significant negative correlations, mainly during the same months as WeMOi. Lastly, NAOi presented the lowest and no significant negative correlations with fog-water collection.This study has been funded by the Spanish Ministerio de EconomĂa y Competitividad and the European Regional Development Fund (FEDER) through the project CGL2015â64268âR (MINECO/FEDER, UE). For this study, the FundaciĂłn CEAM was partly supported by Generalitat Valenciana and research projects âDESESTRESâ PROMETEOII/2014/038 (ConsellerĂa de Cultura) and âVERSUSâ CGL2015â67466âR (MINECO/FEDER)
Variation in species composition and vegetation structure of succulent scrub on Tenerife in relation to environmental variation
On Tenerife, the occurrence of environmental gradients
over short distances provides a unique opportunity to
investigate the relationship between vegetation and environmental
factors. In the semi-arid coastal region of Tenerife,
floristic composition, species richness and vegetation structure
of perennial plants have been studied in 67 locations
covering the existing precipitation gradient.
On the island as a whole, variation in species composition
could be best explained by mean annual precipitation; at
coastal sites, substrate age and soil characteristics also played
a significant role. On the other hand, substrate chemistry and
the type of eruptive material explained little of the floristic
variation. Stand biomass was strongly correlated with mean
annual precipitation and was, on the youngest lava flows
studied, also affected by substrate age. The native stem succulent
species made up the bulk of total biomass along the whole
precipitation gradient. Disturbed and undisturbed sites differed
significantly in stand biomass and cover. Species richness
was correlated with precipitation and substrate age. Distribution
of plant functional types was also related to the
precipitation gradient. The relative abundance of hemicryptophytes
and shrubs with non-hairy leaves increased with
increasing precipitation whereas the ratio of shrubs with hairy/
non-hairy leaves and succulent plants decreased. Some alien
plants were quite frequent at disturbed sites but, on the whole,
they contributed little to the species spectrum and to the stand
biomass. Undisturbed sites remained almost free of introduced
species not considering annuals