NDLI: Barotropic and baroclinic processes in the transport variability of the Antarctic Circumpolar Current

Content Provider	Springer Nature Link
Author	Olbers, Dirk Lettmann, Karsten
Copyright Year	2007
Abstract	Synoptic scale variability of the Southern Ocean wind field in the high-frequency range of barotropic Rossby waves results in transport variations of the Antarctic Circumpolar Current (ACC), which are highly coherent with the bottom pressure field all around the Antarctic continent. The coherence pattern, in contrast to the steady state ACC, is steered by the geostrophic f/h contours passing through Drake Passage and circling closely around the continent. At lower frequencies, with interannual and decadal periods, the correlation with the bottom pressure continues, but baroclinic processes gain importance. For periods exceeding a few years, variations of the ACC transport are in geostrophic balance with the pressure field associated with the baroclinic potential energy stored in the stratification, whereas bottom pressure plays a minor role. The low-frequency variability of the ACC transport is correlated with the baroclinic state variable in the entire Southern Ocean, mediated by baroclinic topographic–planetary Rossby waves that are not bound to f/h contours. To clarify the processes of wave dynamics and pattern correlation, we apply a circulation model with simplified physics (the barotropic–baroclinic-interaction model BARBI) and use two types of wind forcing: the National Centers for Environmental Prediction (NCEP) wind field with integrations spanning three decades and an artificial wind field constructed from the first three empirical orthogonal functions of NCEP combined with a temporal variability according to an autoregressive process. Experiments with this Southern Annular Mode type forcing have been performed for 1,800 years. We analyze the spin-up, trends, and variability of the model runs. Particular emphasis is placed on coherence and correlation patterns between the ACC transport, the wind forcing, the bottom pressure field and the pressure associated with the baroclinic potential energy. A stochastic dynamical model is developed that describes the dominant barotropic and baroclinic processes and represents the spectral properties for a wide range of frequencies, from monthly periods to hundreds of years.
Starting Page	559
Ending Page	578
Page Count	20
File Format	PDF
ISSN	16167341
Journal	Deutsche Hydrografische Zeitschrift
Volume Number	57
Issue Number	6
e-ISSN	16167228
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-10-24
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Antarctic circumpolar current ACC transport Coherence patterns Environmental Monitoring/Analysis Fluids Meteorology/Climatology Geophysics/Geodesy Oceanography
Content Type	Text
Resource Type	Article
Subject	Oceanography

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Wave-induced topographic formstress in baroclinic channel flow

Six circumpolar currents—on the forcing of the Antarctic Circumpolar Current by wind and mixing

Performance of GOCE and GRACE-derived mean dynamic topographies in resolving Antarctic Circumpolar Current fronts

Mechanisms of the meridional heat transport in the Southern Ocean

Editorial comment

Barotropic and baroclinic processes in the transport variability of the Antarctic Circumpolar Current

Ringversuche beim biologischen Monitoring (Kurzfassung)

Climatic variability of transport in the upper layer of the Antarctic Circumpolar Current from hydrological and satellite data

The International Odra Project (summary)

Barotropic and baroclinic processes in the transport variability of the Antarctic Circumpolar Current

Similar Documents

Wave-induced topographic formstress in baroclinic channel flow

Six circumpolar currents—on the forcing of the Antarctic Circumpolar Current by wind and mixing

Performance of GOCE and GRACE-derived mean dynamic topographies in resolving Antarctic Circumpolar Current fronts

Mechanisms of the meridional heat transport in the Southern Ocean

Editorial comment

Barotropic and baroclinic processes in the transport variability of the Antarctic Circumpolar Current

Ringversuche beim biologischen Monitoring (Kurzfassung)

Climatic variability of transport in the upper layer of the Antarctic Circumpolar Current from hydrological and satellite data

The International Odra Project (summary)

Barotropic and baroclinic processes in the transport variability of the Antarctic Circumpolar Current