Interannual variability of Antarctic Intermediate Water in the tropical North Atlantic.

Fu, Yao , Wang, Chunzai , Brandt, Peter and Greatbatch, Richard John (2019) Interannual variability of Antarctic Intermediate Water in the tropical North Atlantic. Journal of Geophysical Research: Oceans, 124 (6). pp. 4044-4057. DOI 10.1029/2018JC014878.

[img] Text
Fu_et_al-2019-Journal_of_Geophysical_Research__Oceans.pdf - Accepted Version
Restricted to Registered users only

Download (1558Kb) | Contact

Supplementary data:

Abstract

Interannual variability of Antarctic Intermediate Water (AAIW) in the tropical North Atlantic is investigated using the GECCO2 ocean state estimate and Argo data. AAIW salinity variability near the western boundary is highly correlated with the transport along the western boundary on interannual timescales. Northward propagating anomalies are associated with the western boundary transport variability that, to some extent, is related to the large‐scale wind stress curl forcing by means of the Sverdrup balance. AAIW anomalies also propagate westward with the speed of baroclinic Rossby waves, indicating that the displacement of the meridional salinity gradient by westward propagation of baroclinic Rossby waves plays a role in the variability of AAIW characteristics. Slower eastward spreading of AAIW anomalies is identified on decadal timescales likely associated with the advection of salinity anomalies by weak eastward current bands. Understanding the observed interannual and decadal variability of AAIW salinity is important to properly interpret salinity changes reported in response to changes in the hydrological cycle.

Document Type: Article
Keywords: Interannual variability of Antarctic Intermediate Water (AAIW) in the tropical North Atlantic; Meridional propagating AAIW salinity anomalies associated with the western boundary transport variability; Zonal propagating AAIW anomalies related to baroclinic Rossby wave propagation
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-OD Ocean Dynamics
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2018JC014878
ISSN: 2169-9275
Projects: FOR1740, ARGO Program
Date Deposited: 27 May 2019 11:49
Last Modified: 22 Jul 2019 07:29
URI: http://oceanrep.geomar.de/id/eprint/46812

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...