Short-term changes in the northwest African Upwelling System induced by Saharan dust deposition events

  1. Pérez, C
  2. Baldasano, J M
  3. Nickovic, S
  4. Bustos, J J
  5. Cuevas, E
  6. Redondo, A
  7. Alonso-Pérez, S 1
  8. Ramos, A G
  9. Coca, J
  1. 1 Universidad de La Laguna
    info

    Universidad de La Laguna

    San Cristobal de La Laguna, España

    ROR https://ror.org/01r9z8p25

Revista:
IOP Conference Series: Earth and Environmental Science

ISSN: 1755-1315

Año de publicación: 2009

Volumen: 7

Páginas: 012019

Tipo: Artículo

DOI: 10.1088/1755-1307/7/1/012019 GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: IOP Conference Series: Earth and Environmental Science

Resumen

During the last 7-year period (2000-2006) atmosphere circulation changes show strong influences on the dust storm deposition dynamics and, as a result, on the primary production dynamics of the northwest African Upwelling System. From 2000 to 2006, the annual mean sea level pressure became higher ranging from 1014 to 1015 mb. Mean annual zonal wind intensity became higher (from 1.1 to 1.8 m s-1), while the mean annual meridional was reduced from 6.2 to 5.3 m s-1 at the north of the Canary Islands. Mean annual satellite-derived AVHRR/NOAA SST recorded in the northwest African Upwelling became warmer in both locations, from 18.3°C to 18.8°C in Cape Ghir and from 19.5°C to 20.3°C north Canary Islands waters. CHL records from the SeaWiFS/OV-2 showed a different pattern trend. Mean annual CHL levels increased at Cape Ghir from 0.65 mg m-3 to 0.9 mg m-3 and significantly reduced from 0.59 mg m-3 to 0.31 mg m-3 at the north of the Canary Islands. Changes observed in the role of CHL during the last 7-years period could be associated to intensive dust deposition and exceptional weather warming observed in this area since 2000. However, this study focused on a 7-year period and conclusions on possible links between dust deposition and marine biochemistry activity cannot be generalized.

Referencias bibliográficas

  • [1] Basterretxea, G. and Arístegui, J, 2000 Mesoscale variability in phytoplankton biomass distribution and photosynthetic parameters in the Canary - NW African coast transition zone. Marine Ecology Progress Series, 197, 27-40.
  • [2] Prospero, J. M. and Carlson, T. N. 1981 Saharan air outbreaks over the tropical North Atlantic. Pure and Applied Geophysic,s 119 (3), 677-691.
  • [3] Lenes, J., Darrow, B., Cattrall, C., Heil, C. A., Callahan, M., Vargo, G., Byrne. R., Prospero, J., Bates, D., Fanning, K. and Walsh, J. 2001 Iron fertilization and the Trichodesmium response on the West Florida shelf. Limnology and Oceanography, 46, 1261-1277.
  • [4] Liu, X.and Millero, F.J. 2005 The solubility of iron in seawater. Marine Chemistry ,77, 43-54.
  • [5] Capone, D.G, Zehr, J.P, Paerl, H.W, Bergman, B., and Carpenter, E.J 1997 Trichodesmium, a globally significant marine cyanobacterium. Science, 276,1221-1229.
  • [6] Kremling, K. and Streu, P., 1993 Saharan dust influenced trace elements fluxes in deep North Atlantic subtropical waters. Deep Sea Research, Part I, 40, 1155-1168.
  • [7] Pérez, C., Nickovic, S., Baldasano, J.M., Sicard, M., Rocadenbosch, F. and Cachorro, V.E. 2006 A long Saharan dust event over the western Mediterranean: Lidar, Sun photometer observations, and regional dust modelling. Journal of Geophysical Research, 111, D15214, doi:10.1029/2005JD006579.
  • [8] Pérez, C., Nickovic, S., Pejanovic, G., Baldasano, J.M., and Özsoy, E., 2006 Interactive dust radiation modelling: A step to improve weather forecasts. Journal of Geophysical Research , 111, D16206, doi:10.1029/2005JD006717.
  • [9] Papayannis, A., Zhang, H.Q., Amiridis, V., Ju, H.B., Chourdakis, G., Georgoussis, G., Pérez, C., Chen, H.B., Goloub, P., Mamouri, R.E., Kazadzis, S., Paronis, D., Tsaknakis, G., and Baldasano, J.M., 2007 Extraordinary dust event over Beijing, China, during April 2006: Lidar, Sun photometric, satellite observations and model validation. Geophysical Research Letters, 34, L07806, doi:10.1029/2006GL029125.
  • [10] Pérez, C., Jiménez-Guerrero, P., Jorba, O., Baldasano, J.M., Cuevas, E., Nickovic, S., Querol, X., 2007 Long-term simulations (1958-2006) of Saharan dust over the Mediterranean and the Eastern North Atlantic with the DREAM regional dust model. In: XXIV International Union of Geodesy and Geophysics (IUGG) General Assembly, Perugia, Italy, 2-13 July 2007.
  • [11] Nickovic, S., Kallos, G., Papadopoulos, A., and Kakaliagou, O., 2001 A model for prediction of desert dust cycle in the atmosphere. Journal of Geophysical Research, 106, D16, 18113– 18129.
  • [12] Coca, J. and Ramos, A., 2004 Relationships between satellite-derived oceanic events and the albacore tuna (Thunnus alalunga, Bonaterre, 1788) artisanal fishing grounds in the NE Atlantic. In Remote Sensing of the Ocean and Sea Ice (Ed. C. Bostater Jr. and Rosalia Santoreli). Proceedings of the SPIE, 5569, 116-129.
  • [13] Torres, M., Gelado, M., Collado, C., Siruela, V., Cardona, P., and Hernández-Brito, J., 2002 Variability of dust inputs to the CANIGO zone. Deep-Sea Research II, 49, 3455-3464.
  • [14] Arístegui, J., Tett, P., Hernández-Guerra, A., Basterretxea, G., Montero, M.F., Wild, K., Sangrá, P., Hernández-León, S., Cantón, M., García - Braun, J.A, Pacheco, M., and Barton, E.D., 1997 The influence of island-generated eddies on chlorophyll distribution: a study of mesoscale variation around Gran Canaria. Deep-Sea Research, 44, 71-96.
  • [15] Ramos A., Martel, A., Codd, G., Soler, E., Coca, J., Redondo, A., Morrison, L., Metcalf, J., Ojeda, A., Suárez, S., and Petit. M., 2005 Bloom of the marine diazotrophic cyanobacterium Trichodesmium erythraeum Ehrenberg in the Northwest African Upwelling. Marine Ecology Progress Series, 301, 303-305.
  • [16] Hood, R.R., Subramaniam, A., May, L.R., Carpenter, E.J. and Capone, D.G. 2002 Remote sensing of nitrogen fixation by Trichodesmium. Deep-Sea Research II, 49, 23-147