The University of Southampton
University of Southampton Institutional Repository

Transatlantic temperature and salinity changes at 24.5°N from 1957 to 2004

Transatlantic temperature and salinity changes at 24.5°N from 1957 to 2004
Transatlantic temperature and salinity changes at 24.5°N from 1957 to 2004
In 2004 a fifth occupation of a transatlantic section at 24.5°N allows us to examine decadal temperature and salinity changes using high quality full-depth hydrographic data since 1957. Waters shallower than 1750 dbar have been warming and salinifying at least since 1981 and in 2004 are significantly warmer and saltier than at any time since 1957, while deeper than 3000 dbar there has been continuous cooling and freshening since 1957. Temperature and salinity changes at constant pressures are partitioned into changes on isopycnal surfaces and changes due to the vertical movement of the isopycnals. Warming in the western Atlantic thermocline since 1957 at a rate of 0.0111 °C/yr dominates the transatlantic average, while deep water has cooled and freshened at rates of ?0.0021 °C/yr and ?0.0003 psu/yr respectively. We argue that the shallower and deeper changes are consistent with a recently reported increased southward thermocline circulation and reduced southward flux of deep water.
Atlantic, temperature, salinity
0094-8276
L14606
Cunningham, S.A.
07f1bd78-d92f-478b-a016-b92f530142c3
Alderson, S.
00ee9859-a11f-4040-a963-d88d4ae2740d
Cunningham, S.A.
07f1bd78-d92f-478b-a016-b92f530142c3
Alderson, S.
00ee9859-a11f-4040-a963-d88d4ae2740d

Cunningham, S.A. and Alderson, S. (2007) Transatlantic temperature and salinity changes at 24.5°N from 1957 to 2004. Geophysical Research Letters, 34 (14), L14606. (doi:10.1029/2007GL029821).

Record type: Article

Abstract

In 2004 a fifth occupation of a transatlantic section at 24.5°N allows us to examine decadal temperature and salinity changes using high quality full-depth hydrographic data since 1957. Waters shallower than 1750 dbar have been warming and salinifying at least since 1981 and in 2004 are significantly warmer and saltier than at any time since 1957, while deeper than 3000 dbar there has been continuous cooling and freshening since 1957. Temperature and salinity changes at constant pressures are partitioned into changes on isopycnal surfaces and changes due to the vertical movement of the isopycnals. Warming in the western Atlantic thermocline since 1957 at a rate of 0.0111 °C/yr dominates the transatlantic average, while deep water has cooled and freshened at rates of ?0.0021 °C/yr and ?0.0003 psu/yr respectively. We argue that the shallower and deeper changes are consistent with a recently reported increased southward thermocline circulation and reduced southward flux of deep water.

Full text not available from this repository.

More information

Published date: July 2007
Keywords: Atlantic, temperature, salinity
Organisations: National Oceanography Centre,Southampton

Identifiers

Local EPrints ID: 49680
URI: https://eprints.soton.ac.uk/id/eprint/49680
ISSN: 0094-8276
PURE UUID: 9fa8f166-347d-4dc9-b266-575523b6fb84

Catalogue record

Date deposited: 21 Nov 2007
Last modified: 13 Mar 2019 20:53

Export record

Altmetrics

Contributors

Author: S.A. Cunningham
Author: S. Alderson

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×