Syracuse university


During what time of year does upwelling occur in Peru?



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35. During what time of year does upwelling occur in Peru?

 
36. During what years in the past have there been other El Niño events?


 

37. Why would it be useful to plot the ocean water temperature at 60 meters depth, as has been done in the lowermost plot?

 

 



 

 

 



 

 

 



 

The diagram to the right is for Monterey Bay. It shows temperature and salinity profiles contoured against time from a mid-Monterey Bay location. The lowermost diagram is a measure of density, which is calculated from temperature and salinity.

 

38. Draw arrows that show upwelling events on these diagrams.

 

39. During what time of year does upwelling occur in Monterey Bay? Why is it not the same time as in Peru?

 
40. Does upwelling bring higher salinity or lower salinity water to the surface?
41. Can you find the 1997-98 El Niño event on the Monterey Bay record? Label it.

 

42. Can you find the 1991-92 El Niño event on the Monterey Bay record? Label it.

 

43. During which time of year is biologic productivity likely to be highest in the Monterey Bay area?

 

One question that remains is why deep Monterey Bay water is saltier than surface Monterey Bay water. There are at least two possibilities:



1) Evaporation during the summer creates salty water at the surface that then sinks.

2) The southerly flowing California Current introduces low salinity over the higher salinity water.

 

44. Which one of these possibilities is more likely to be correct? Please explain why.

 

All the Monterey Bay data comes from Francisco Chavez’ Biological Ocean Group at MBARI:



http://www.mbari.org/bog/

He has compiled lots of time series data of Monterey Bay chemistry:



http://www.mbari.org/bog/projects/centralcal/summary/ts_summary.htm

A location map of his permanently moored CTD stations is at:



http://www.mbari.org/bog/roadmap/major_stations.htm

 


Lab 5D – Atmospheric and Oceanic Circulation Page


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