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Spring Observations of Chlorophyll, Zooplankton, & Fish in the eastern Bering Sea Jeffrey Napp 1 Alex DeRobertis 1 Phyllis Stabeno 2 1 NOAA Alaska Fisheries Science Center 2 NOAA Pacific Marine Environmental Laboratory Slide 2 Chlorophyll Data Status: All samples analyzed. Initial QC performed. Underway & near surface groundtruth data submitted. Sections & Final QC next step. Data submission to BEST project database. BEST: 2007 Chlorophyll Slide 3 Whats All That Golden Brown Stuff? ~ 30 cm Slide 4 Slide 5 Slide 6 Fig. 3 Five panels show the variability along the 70-m isobath in the spring. 2005 70 m Isobath Transect Stabeno, Mordy, and Napp, in prep. Slide 7 M5 Slide 8 M8M4M5M2 Slide 9 BEST Fish and Macrozooplankton acoustics Low frequency (38 kHz)High Frequency (120 kHz) Fish school euphausiids Range Distance Frequency difference is the basis for classification Installation of 2 frequency EK60 echosounders on Healy Use same equipment on Miller Freeman Continuous recording of backscatter Classification of signal into fish and euphausiid classes Similar work planned for IERP Slide 10 Preliminary Distribution Maps Healy and Miller Freeman Euphausiid backscatterFish Backscatter Figure 2. Acoustic backscatter (S A m 2 nmi -2) attributed to A) fish and B) euphausiids along Healys and Miller Freeman's tracklines. The 200, 100, 70 and 50m isobaths are shown as gray dotted lines, and the approximate position of the ice edge at the start of the cruise is given in red. Symbol size and color is proportional to the intensity of acoustic backscatter. Slide 11 With Thanks Funding NSF/BEST; NPRB; NOAA/NPCREP Shipboard B. Blaud, R. Cartwright, J. Clark, E. Cokelet, R. Freyer, D. Kachel, N. Kachel, C. Ladd, A.J. LeFevre, K. Mier, D. Righii, I. Spies Laboratory R. Freyer, C. Harpold Slide 12 T4 T6 T7