The salinity front sometimes moved southward, mainly south of 5oN, and the movement was well correlated with the southern oscillation index (SOI). Because precipitation at Yap (9.5oN, 138.1oE) fluctuated with SOI, this spike-like southward movement of the salinity front was probably affected by reduction of low-salinity water during El Nino in the north-western Pacific Ocean. However, ENSO only induced such large southward movements of the salinity front when the time lag between the low precipitation and low SOI was short (within four months).
http://tinyurl.com/3n4lype

...the nature of 'spike-like' salinity profiles in the loop in the presence of weak diffusion.
http://tinyurl.com/3gxlvg4

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Note added at 1 day4 hrs (2011-09-22 13:47:03 GMT)
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W całości: mająca kształt piku linia przesunięcia frontu zasolenia na północ

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Note added at 1 day7 hrs (2011-09-22 16:13:22 GMT)
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Dlaczego nie? Wykres to linia, a tu też chodzi o linię. Można dać "spiczasty" (choć osobiście wolę formę "szpiczasty"), ale to chyba mało naukowo brzmi.

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Note added at 3 days9 hrs (2011-09-24 18:06:19 GMT)
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Tak, "klinowy", "w kształcie (ostrego) klina" - bardzo dobre określenia. "Trójkątny" w tym kontekście nie pasuje. A może neologizm "ostroklinowy" (na wzór: "ostrokątny")?