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Regime Shift??

During regime shifts all the sub areas (right) of North Pacific tend to restructure – as in 1977 and lesser extent 1989; but have we really had a regime shift in 1998?

1998 Regime shift?	What’s happening?
	PICES study attempts answer

1 = Central North Pacific –

look at TZCF for changes after 1998

North American coastal

Ecosystems

2 = California Current

3 = Gulf of Alaska

4 = Bering/ Aleutians

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PICES Report is 13 megs PDF file --- here is contents page as HTML and links

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I look mainly at our region – here called GOA (Gulf of AK) see below

Regime shift?? -- Ask the fish

- And sea birds

- and whales

The PICES’ report is technical; still worth the read if interested in fish stocks etc --- or even the ‘health’ of various North pacific ecosystems. (see 1° Intro & Appendices)

Below are some items that caught my attention – mostly Hecate material

Central Pacific --- changes in TZCF since 1998?

TZCF (Transition zone chlorophyll front) original data here

Note how in the winter the chlorophyll area has moved south while in summer the maximum plankton growth moved northward – the ‘front’ between cold nutrient rich sub polar water and the nutrient poor sub tropical waters = TZCF