Spatial and Temporal Patterns of the Coastal Upwelling in the Northern Parts of Persian Gulf

In this study, the coastal upwelling was investigated along the northern shoreline of the Persian Gulf. For this purpose, the shoreline was divided to ۳۴ segments from northwest to the southeast. the long-term satellite data have been obtained including wind speed components and sea surface temperature (SST). Based on wind speed data, the Ekman transport components (zonal and meridional) were computed for a period of ۲۴ years and with the Ekman transport components, coastal upwelling index were calculated for this period. The annual cycles of coastal upwelling revealed the most intense coastal upwelling at the central areas of north coastal waters, about ۲۷.۶ ̊ N-۲۸.۴ ̊ N and ۵۱.۱ ̊ E -۵۱.۶ ̊ E, including three peaks in June, November and February. Then, a cross-correlation analysis was employed on the ۲۴-year daily time series to evaluate the effect of coastal upwelling on the SST. The time lag at each of segment was found ۳ or ۴ days (mostly ۴). As expected from upwelling theory, the computed statistically significant cross-correlations coefficients represented that the SST reduces more in the sub-regions (segments) with the more intense coastal upwelling along the northern shoreline of Persian Gulf. So, in this paper, the results of the statistical analysis validated the used data and the results came from computation procedure. All the data processing, computation, analyses, diagrams and plots have been programmed and provided by MATLAB.

کلیدواژه ها:

Coastal upwelling ، Persian Gulf ، Correlation ، SST