RT info:eu-repo/semantics/bookPart
T1 Saharan dust and the aerosols on the Canary Islands: past and present
A1 Dorta Antequera, Pedro Javier
A1 Menéndez, Inmaculada
A1 Derbyshire, Edward
A1 Engelbrecht, Johann
A1 Suchodoletz, Hans von
A1 Zöller, Ludwig
A1 Carrillo, Teresa
A1 Rodríguez de Castro, Felipe
A2 Geografía e Historia
AB The Canary Islands are located on the western dominant transport path ofatmospheric dust plumes generated in the Saharan desert. The Saharan region is widelyregarded as the world's greatest source of natural mineral dust, much of which isdelivered to the ocean and, from time to time, reaches Southern Europe and theAmericas. The fact that the Canary Island archipelago is well placed to receive advectedSaharan dust plumes was registered by the State Agency of Meteorology of Spain as longago as the 1950s. Most studies focus on the observation and monitoring of the dusttransport, by analyzing satellite images provided by various agencies (AERONET;MPLNET; EARLINET). Recent research on pa1iicu!ate matter has expanded in recentyears to include particle size measurements, aggregation, mineralogy, geochemistry, andparticle reactivity, as well as considering the impact on human health and global di.mate.This chapter will provide a review of previous research on Saharan dust and otheraerosols unde1iaken on the Canary Islands, research groups and agencies involved andtheir key findings, as well as the main thrust of current research and prospects for futurework. It will consider accumulation of Saharan dust both at present and in the pastas wellas its textura! and mineralogical characteristics in deposits found on the islands.Paiticular attention will be afforded to the impact on the land surface and humanpopulation. It will be shown that for the period 2005-2007 the deposition rates on the island of Gran Canaria were of the order of 20 ± 11 g m·2 y"1. A high percentage ofaggregate in the deposited dust (> 60%) has been determined using Image Analysis ofSEM-EDX. Results from these studies show that particle aggregates have lower bulkdensities than individual particles, a characteristic with relevance to some existing dustplume transpmtation models.On the basis of geomorphologic mapping, GIS-calculations, luminescence dating andsedimentologic-pedologic analyses of sediments trapped in volcanically-dammed valleyson the Canmy Island of Lanzarote, estimates of soil moisture fluctuations in depositedSaharan dust and the hydrologic budget of the island are put forward for the LateQuaternary. These deposits provide information on anthropogenic influence on the dustsource area of the nearby Saharan Desert during the Holocene and constitute a basis forquantitative estimates of dust input to this island during a Jarge part of the Quatemmy.
SN 978-1-60692-907-0
YR 2009
FD 2009
LK http://riull.ull.es/xmlui/handle/915/34852
UL http://riull.ull.es/xmlui/handle/915/34852
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 26-dic-2024