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AGU: Geophysical Research Letters

 

Keywords

  • bottom water warming
  • thermohaline circulation
  • CDW

Index Terms

  • Oceanography: General: Physical and chemical properties of seawater
  • Oceanography: Physical: Decadal ocean variability
  • Oceanography: Physical: General circulation
  • Oceanography: Physical: Hydrography and tracers

Abstract

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

Takeshi Kawano

Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan

Masao Fukasawa

Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan

Shinya Kouketsu

Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan

Hiroshi Uchida

Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan

Toshimasa Doi

Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan

Ikuo Kaneko

Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan

Michio Aoyama

Geochemical Research Department, Meteorological Research Institute, Tsukuba, Japan

Wolfgang Schneider

Departamento de Oceanografía and Centro de Investigación Oceanográfica en el Pacifico Sur-Oriental, Universidad de Concepción, Concepcion, Chile

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.

Received 21 August 2006; accepted 8 November 2006; published 14 December 2006.

Citation: Kawano, T., M. Fukasawa, S. Kouketsu, H. Uchida, T. Doi, I. Kaneko, M. Aoyama, and W. Schneider (2006), Bottom water warming along the pathway of lower circumpolar deep water in the Pacific Ocean, Geophys. Res. Lett., 33, L23613, doi:10.1029/2006GL027933.

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