LT Anna C. (Christy) Bryant

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Presentation transcript:

LT Anna C. (Christy) Bryant Compiling Nutrient Data on CalCOFI Line 67 for a Spring and Fall Cruise. LT Anna C. (Christy) Bryant

The Data Would Not Be Ready Objective Analyze data regarding nutrients taken during the CTD casts during Leg 1 of OC3570 cruise. Unfortunately... The Data Would Not Be Ready

Solution Use data from a September, 2000 cruise And just to see the differences…added in a data set from a May 2000 cruise

Background Chemistry Physics Biology

CalCOFI Grid Monterey Bay CalCOFI Line 67

Upwelling Index Location

The Data Occasional instances of ‘no data’ Bottles not measured Depth of last bottle varied None of the data was “square” Linear interpolation was used to square it Cruises covered different distances One was 425 km, one was 275 km

Some Data Points “no data”

Other “no data” points were treated...

“Squaring Data” * Collection Points - Interpolated line

Nutrients Consistently tested were: SiO4 (Silicate) PO4 (Phosphate) NO3 (Nitrate) Nitrate is the limiting macronutrient for phytoplankton in these waters (typically). (Pennington and Chavez, 2000)

NO3 in M/l May 2000 Sept 2000

May 2000 Sept 2000

NO3 Profiles Sept 2000 May 2000 NO3 M/l NO3 M/l D E P T H (m) NO3 M/l NO3 M/l Profiles progress from C1 towards the west. Sept goes to 425km off the coast, while May only goes to 275 km.

Sept-May 2000 NO3 Contour September has less near shore September has more off-shore

April/May Significantly Higher than Sept nearshore Upwelling Index taken from Upwelling Index Update, U.S. West Coast, 33N-48N Latitude Units in Cubic Meters per Second per 100 Meters of Coastline April/May Significantly Higher than Sept nearshore

PO4 in M/l May 2000 Sept 2000

SiO4 in M/l May 2000 Sept 2000

Temp (ºC) May 2000 Sept 2000

Difference Contours

Summary and Conclusions 1) Nutrients showed very similar profiles along the CalCOFI line for May and September, 2000. 2) Higher values of nutrients in the vicinity of the M1/H3 station for May are in keeping with the averaged Upwelling Index for locations just South and North of the station. 3) Data from several more cruises would have been more illuminating, perhaps one per month. Once the program problems were fixed, creating more profiles doesn’t take much time.

Questions??