Paper 5 



species and an increase in yeLLowtaiL and bonito populations off 

 California. Changes of sea level related to fluctuating coastal 

 circulation may be associated with variations in year class 

 strengths of marine populations due to changes in larval 

 t r ansport . 



In his investigation of low frequency sea level oscillations^ 

 Roden (1966) found a high coherence in sea level fluctuations 

 measured by tide gages located within similar macroenvironments/ 

 such as those located within the Gulf of Alaska or within the 

 California Current area. Even stations with dissimilar exposure*' 

 such as thos.e with gages located on the open coast compared to 

 those with gages located in enclosed baysx yielded similar 

 results if the stations were within the same macr oenv i ronment . 

 We now examine fluctuations of sea level in groups of stations 

 having similar oceanog raph i c environments. 



A I eut i an Is I ands 



Sea I 



term 



(1952 



and 



anoma 



to b 



This 



of r 



Sear 



p r oce 



inter 



e xami 



1957- 



pos i t 



1964- 



sugge 



U na la 



e ve I s 



lower 

 -53) . 



At tu 

 lous ly 

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 sugges 

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 may re 

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 5 9. U 

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 67 and 

 sts I 

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 sea 



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1971 

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 1952 

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-74 



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 St to 

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 esf w 

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 not 

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 dur i n 

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 f luct 



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ith a 



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 show 



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 ua t io 



te 



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 low 

 aska 



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 een 



Att 

 twee 

 nt 



Ada 

 s t 



ano 

 oma I 

 57-5 

 t ron 

 ns 



van 



een 

 sea 

 , K 

 k in 

 Attu 



U r W 



n th 



comb 



k, U 



he 



malo 



ies 



9. 



g n 



in 



able 

 at A 

 leve 

 cdi a 

 ear 

 and 

 hi ch 

 e Pa 

 inat 

 na la 

 on ly 

 us ly 

 thro 



In 

 egat 

 the 



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k, 



ly 1 



nei 



i s 

 c i f i 

 ion 



SkSr 

 St 



hi 

 ugh 



con 

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 ocea 



Si gni 



(1943 



obser 



and 



953. 



ghbor 



locat 



c Oce 



of 



or K 

 at i on 

 gh s 



1956 

 t rast 



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f i ca 

 -51) 

 ved 

 Yaku 

 The 

 i ng 

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 an a 

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 odi a 



of 

 ea 



an 

 A th 

 a li e 

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nt 



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 tat 

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Stat 

 n an 

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 ronm 

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 leve 

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 ment 



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show 



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It is 



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Is in 



t rong 



r iods 



This 



near 



§yit 2l Alaska " Pacific Northwest 



Kodiak has the shortest record of observations in the series. It 

 was included to fill a gap between widespread stations. It shows 

 surprisingly small variations in sea level with extremes in 

 1957-56 and 1961-62. A weak positive anomaly with a peak in 

 early 1958 is evident. 



The Yakutat gage/' Located in a harbor/^ is subject to salinity 

 changes due to increased river runoff during sum-mer months 

 (Favorite 1974). The trend of decreasing sea level seen in the 

 series for this station results from land uplift due to isostatic 

 glacial rebound. Strong negative anomalies are evident during 

 1955-56r 1961-62^ and 1971-72. Surprising small positive 



55 



