The obduction of equatorial 13°C water in the pacific identified by a simulated passive tracer

Tangdong Qu, Shan Gao, Ichiro Fukumori, Rana A Fine, Eric J. Lindstrom

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The obduction of equatorial 13°C Water in the Pacific is investigated using a simulated passive tracer of the Consortiumfor Estimating the Circulation and Climate of the Ocean (ECCO). The result shows that the 13°C Water initialized in the region 8°N-8°S, 130°-90° W enters the surface mixed layer in the eastern tropical Pacific, mainly through upwelling near the equator, in the Costa Rica Dome, and along the coast of Peru. Approximately two-thirds of this obduction occurs within 10 years after the 13°C Water being initialized, with the upper portion of the water mass reaching the surface mixed layer in only about a month. The obduction of the 138C Water helps to maintain a cool sea surface temperature year-round, equivalent to a surface heat flux of about 26.0 W m-2 averaged over the eastern tropical Pacific (15°S-15°N, 130°W-eastern boundary) for the period of integration (1993-2006). During El Niño years, when the thermocline deepens as a consequence of the easterly wind weakening, the obduction of the 13°C Water is suppressed, and the reduced vertical entrainment generates a warming anomaly of up to 10 W m-2 in the eastern tropical Pacific and in particular along the coast of Peru, providing explanations for the warming of sea surface temperature that cannot be accounted for by local winds alone. The situation is reversed during La Niña years.

Original languageEnglish (US)
Pages (from-to)2282-2297
Number of pages16
JournalJ. PHYSICAL OCEANOGRAPHY
Volume40
Issue number10
DOIs
StatePublished - Oct 2010

Fingerprint

obduction
tracer
mixed layer
surface layer
sea surface temperature
water
warming
coast
thermocline
entrainment
water mass
dome
heat flux
upwelling
anomaly
climate
ocean

Keywords

  • Ekman pumping/transport
  • Entrainment
  • Mixed layer
  • Pacific ocean
  • Sea surface temperature
  • Tracers
  • Tropics

ASJC Scopus subject areas

  • Oceanography

Cite this

The obduction of equatorial 13°C water in the pacific identified by a simulated passive tracer. / Qu, Tangdong; Gao, Shan; Fukumori, Ichiro; Fine, Rana A; Lindstrom, Eric J.

In: J. PHYSICAL OCEANOGRAPHY, Vol. 40, No. 10, 10.2010, p. 2282-2297.

Research output: Contribution to journalArticle

Qu, Tangdong ; Gao, Shan ; Fukumori, Ichiro ; Fine, Rana A ; Lindstrom, Eric J. / The obduction of equatorial 13°C water in the pacific identified by a simulated passive tracer. In: J. PHYSICAL OCEANOGRAPHY. 2010 ; Vol. 40, No. 10. pp. 2282-2297.
@article{19873244fdda49c0bd60aa2946e94a6d,
title = "The obduction of equatorial 13°C water in the pacific identified by a simulated passive tracer",
abstract = "The obduction of equatorial 13°C Water in the Pacific is investigated using a simulated passive tracer of the Consortiumfor Estimating the Circulation and Climate of the Ocean (ECCO). The result shows that the 13°C Water initialized in the region 8°N-8°S, 130°-90° W enters the surface mixed layer in the eastern tropical Pacific, mainly through upwelling near the equator, in the Costa Rica Dome, and along the coast of Peru. Approximately two-thirds of this obduction occurs within 10 years after the 13°C Water being initialized, with the upper portion of the water mass reaching the surface mixed layer in only about a month. The obduction of the 138C Water helps to maintain a cool sea surface temperature year-round, equivalent to a surface heat flux of about 26.0 W m-2 averaged over the eastern tropical Pacific (15°S-15°N, 130°W-eastern boundary) for the period of integration (1993-2006). During El Ni{\~n}o years, when the thermocline deepens as a consequence of the easterly wind weakening, the obduction of the 13°C Water is suppressed, and the reduced vertical entrainment generates a warming anomaly of up to 10 W m-2 in the eastern tropical Pacific and in particular along the coast of Peru, providing explanations for the warming of sea surface temperature that cannot be accounted for by local winds alone. The situation is reversed during La Ni{\~n}a years.",
keywords = "Ekman pumping/transport, Entrainment, Mixed layer, Pacific ocean, Sea surface temperature, Tracers, Tropics",
author = "Tangdong Qu and Shan Gao and Ichiro Fukumori and Fine, {Rana A} and Lindstrom, {Eric J.}",
year = "2010",
month = "10",
doi = "10.1175/2010JPO4358.1",
language = "English (US)",
volume = "40",
pages = "2282--2297",
journal = "Journal of Physical Oceanography",
issn = "0022-3670",
publisher = "American Meteorological Society",
number = "10",

}

TY - JOUR

T1 - The obduction of equatorial 13°C water in the pacific identified by a simulated passive tracer

AU - Qu, Tangdong

AU - Gao, Shan

AU - Fukumori, Ichiro

AU - Fine, Rana A

AU - Lindstrom, Eric J.

PY - 2010/10

Y1 - 2010/10

N2 - The obduction of equatorial 13°C Water in the Pacific is investigated using a simulated passive tracer of the Consortiumfor Estimating the Circulation and Climate of the Ocean (ECCO). The result shows that the 13°C Water initialized in the region 8°N-8°S, 130°-90° W enters the surface mixed layer in the eastern tropical Pacific, mainly through upwelling near the equator, in the Costa Rica Dome, and along the coast of Peru. Approximately two-thirds of this obduction occurs within 10 years after the 13°C Water being initialized, with the upper portion of the water mass reaching the surface mixed layer in only about a month. The obduction of the 138C Water helps to maintain a cool sea surface temperature year-round, equivalent to a surface heat flux of about 26.0 W m-2 averaged over the eastern tropical Pacific (15°S-15°N, 130°W-eastern boundary) for the period of integration (1993-2006). During El Niño years, when the thermocline deepens as a consequence of the easterly wind weakening, the obduction of the 13°C Water is suppressed, and the reduced vertical entrainment generates a warming anomaly of up to 10 W m-2 in the eastern tropical Pacific and in particular along the coast of Peru, providing explanations for the warming of sea surface temperature that cannot be accounted for by local winds alone. The situation is reversed during La Niña years.

AB - The obduction of equatorial 13°C Water in the Pacific is investigated using a simulated passive tracer of the Consortiumfor Estimating the Circulation and Climate of the Ocean (ECCO). The result shows that the 13°C Water initialized in the region 8°N-8°S, 130°-90° W enters the surface mixed layer in the eastern tropical Pacific, mainly through upwelling near the equator, in the Costa Rica Dome, and along the coast of Peru. Approximately two-thirds of this obduction occurs within 10 years after the 13°C Water being initialized, with the upper portion of the water mass reaching the surface mixed layer in only about a month. The obduction of the 138C Water helps to maintain a cool sea surface temperature year-round, equivalent to a surface heat flux of about 26.0 W m-2 averaged over the eastern tropical Pacific (15°S-15°N, 130°W-eastern boundary) for the period of integration (1993-2006). During El Niño years, when the thermocline deepens as a consequence of the easterly wind weakening, the obduction of the 13°C Water is suppressed, and the reduced vertical entrainment generates a warming anomaly of up to 10 W m-2 in the eastern tropical Pacific and in particular along the coast of Peru, providing explanations for the warming of sea surface temperature that cannot be accounted for by local winds alone. The situation is reversed during La Niña years.

KW - Ekman pumping/transport

KW - Entrainment

KW - Mixed layer

KW - Pacific ocean

KW - Sea surface temperature

KW - Tracers

KW - Tropics

UR - http://www.scopus.com/inward/record.url?scp=77958535698&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77958535698&partnerID=8YFLogxK

U2 - 10.1175/2010JPO4358.1

DO - 10.1175/2010JPO4358.1

M3 - Article

AN - SCOPUS:77958535698

VL - 40

SP - 2282

EP - 2297

JO - Journal of Physical Oceanography

JF - Journal of Physical Oceanography

SN - 0022-3670

IS - 10

ER -