Resumen del producto

Variability of the  chlorophyll a (Chl  a) concentration and  halocline depth in La  Paz  Bay  were  analyzed and  compared against the  variability of North Pacific  (NP) large-scale phenomena and  local winds during 1999–2009. Chl a data were obtained from  satellite images, and  halocline depth was  obtained from  in  situ   data. Eight large-scale phenomenon climate indices and   satellite wind   data were   also  used   in  this work.   Chl  a was   processed on  three  timescales— interannual, mean annual cycle, and  monthly time  series. The halocline depth was processed as a time  series. The Chl a interannual analysis revealed a high  variability in  the  study period, with the  highest concentration in  2001  and  the lowest in 2005.  The  Pacific  Decadal Oscillation (PDO) was the  dominant phenomenon in this timescale. The  Chl a mean annual cycle showed two concentration periods, a higher one during December to March and  lower one during April  to November. The  El  Nin˜ o Southern Oscillation (ENSO)  and  PDO  were  the  most  determinant phenomena in  the  mean annual cycle. The  monthly time  series also showed high  variability with the  highest anomalies during 2000–01 and  the lowest anomalies in 2003 and  2005. The ENSO and  PDO were  the  most  influential phenomena on the  monthly timescale. The  halocline depth analysis revealed high  and  noncyclic variability, contrasting depths of 90 m during February 2002 and  November 2005 with other sampling dates such  as July 2001 and  July 2002, when the  halocline reached the  surface. The  NP  and  local winds were  the  main factors that influenced the  halocline depth.

Palabras clave: La Paz Bay; Pacific Large-Scale Climatic Phenomena; Chlorophyll a Concentration and Halocline Depth

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