. Boletin de la Sociedad de Biología de Concepción. Sociedad de Biología de Concepción; Biology; Biology. Bol. Soc. Biol. Concepción, Chile. Tomo 62, 1991 401 35- > 30. § 25 a 20 w £ 15 10 5 O ? OCTOBER 1979 ^ OCTOBER MEAN OF 1965-1978 i *r7m-. N NE E SE S SW W NW Winds Figure October frequencies of wind directions, in the diagram; dark, bars show thirteen year average and light bar show October of 1979. Concepción, 1979). Early spring months show a high variability on the winds dominance pattem, but a behavioural tendency is Consolidated on the late month of the same season. October 19
. Boletin de la Sociedad de Biología de Concepción. Sociedad de Biología de Concepción; Biology; Biology. Bol. Soc. Biol. Concepción, Chile. Tomo 62, 1991 401 35- > 30. § 25 a 20 w £ 15 10 5 O ? OCTOBER 1979 ^ OCTOBER MEAN OF 1965-1978 i *r7m-. N NE E SE S SW W NW Winds Figure October frequencies of wind directions, in the diagram; dark, bars show thirteen year average and light bar show October of 1979. Concepción, 1979). Early spring months show a high variability on the winds dominance pattem, but a behavioural tendency is Consolidated on the late month of the same season. October 1979, when this research took place, was not an exception to this general pattem (Fig. 2). Nevertheless a short period of observations was necessary in orden to stablish the relationship between the local wind forcing the surface water and advection process. A record of winds and currents registered for the mooring period (October 24 to December 28), showed a wind average speed of m s' to south. Shelf currents measured at 50 m depth had a speed average of cm s' to west (Blanco, 1984). The analysis of these series revealed on one hand a timelag of 18 hours approximately between the wind changes and current responses at 50 m depth (Fig. 3). On the other hand, current intensity response seemed to be independent from wind intensity. The north-south components of wind stress (Fig. 4), averaged on 6 h running mean, for the period of hidrographic field sampling. On a day basis scale, strong favourable upwelling winds occurred one day before sampling (negative valúes of tau) and variables winds for the period were also found. Weak northward winds were observed before the onset of the event (28 October), followed by increasing northward winds (29 October). After a calm period in the moming of October the 30^^, the still dominant alongshore northward component of the stress shifted towards south later in the day. These behaviours were also reflected in the general hydrogr
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