eCite Digital Repository

Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod

Citation

Pena-Molino, B and Joyce, TM and Toole, JM, Recent changes in the Labrador Sea Water within the Deep Western Boundary Current southeast of Cape Cod, Deep-Sea Research. Part 1: Oceanographic Research Papers, 58, (10) pp. 1019-1030. ISSN 0967-0637 (2011) [Refereed Article]


Preview
PDF
Restricted - Request a copy
1Mb
  

Copyright Statement

Copyright 2011 Elsevier Ltd.

DOI: doi:10.1016/j.dsr.2011.07.006

Abstract

Water properties measured by the central mooring in the Line W mooring array southeast of Cape Cod document a large character shift during the period of November 2001 to April 2008. The observed temperature, salinity and planetary potential vorticity (PPV) anomalies manifest changes in the formation region of the water masses present at Station W, specifically upper Labrador Sea Water (uLSW), deep Labrador Sea Water (dLSW) and Overflow Water (OW). During the observation period, the minimum in the PPV anomaly field relative to the record mean PPV profile migrated from 1500 m, where it was originally found, to 700 m. Temporal changes in the vertical distribution of temperature and salinity were correlated with the PPV changes. This suggests a dLSW-dominated first half of the record versus an uLSW-dominated second half. The structure of these anomalies is consistent with observations within the Labrador Sea, and their transit time to Line W agrees well with tracer-derived times for signals spreading along the western boundary. In that context, the observed water properties at Line Win the early 2000s reflected the intense deep convection in the Labrador Sea in the mid-1990s, with less intense convection subsequently affecting lighter isopycnals. The observed velocity field is dominated by high-frequency (periods of days to months) fluctuations, however, a fraction of the velocity variability is correlated with changes in water mass properties, and indicate a gradual acceleration of the southwestward flow, with a corresponding increase in Deep Western Boundary Current transport.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Marine Oceanic Processes (excl. climate related)
Author:Pena-Molino, B (Dr Beatriz Pena-Molino)
ID Code:78157
Year Published:2011
Web of Science® Times Cited:14
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2012-06-15
Last Modified:2017-11-01
Downloads:0

Repository Staff Only: item control page