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2006•Geophysical Research LettersRequires access

Bottom water warming along the pathway of lower circumpolar deep water in the Pacific Ocean

Takeshi Kawano, Masao Fukasawa, Shinya Kouketsu, Hiroshi Uchida, Toshimasa Doi, Ikuo Kaneko, Michio Aoyama, Wolfgang Schneider

Open publisher page 77 citations

Abstract

Repeat trans‐Pacific hydrographic observations along the pathway of Lower Circumpolar Deep Water (LCDW) reveal that bottom water has warmed by about 0.005 to 0.01°C in recent decades. The warming is probably not from direct heating of LCDW, but is manifest as a decrease of the coldest component of LCDW evident at each hydrographic section. This result is consistent with numerical model results of warming associated with decreased bottom water formation rates around Antarctica.

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What this paper is about

Repeat trans‐Pacific hydrographic observations along the pathway of Lower Circumpolar Deep Water (LCDW) reveal that bottom water has warmed by about 0.005 to 0.01°C in recent decades. The warming is probably not from direct heating of LCDW, but is manifest as a decrease of the coldest component of LCDW evident at each hydrographic section. This result is consistent with numerical model results of warming associated with decreased bottom water formation rates around Antarctica.

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Available abstract

Repeat trans‐Pacific hydrographic observations along the pathway of Lower Circumpolar Deep Water (LCDW) reveal that bottom water has warmed by about 0.005 to 0.01°C in recent decades. The warming is probably not from direct heating of LCDW, but is manifest as a decrease of the coldest component of LCDW evident at each hydrographic section. This result is consistent with numerical model results of warming associated with decreased bottom water formation rates around Antarctica.

Key concepts: Hydrography, Circumpolar deep water, Circumpolar star, Bottom water, Oceanography, Antarctic Bottom Water, Climatology, Environmental science

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