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Author Bashmachnikov, I.L.; Fedorov, A.M.; Vesman, A.V.; Belonenko, T.V.; Dukhovskoy, D.S.
Title Thermohaline convection in the subpolar seas of the North Atlantic from satellite and in situ observations. Part 2: indices of intensity of deep convection Type $loc['typeJournal Article']
Year 2019 Publication Abbreviated Journal
Volume 16 Issue 1 Pages 191-201
Keywords deep convection, assimilation of satellite data, altimetry, water density, the Greenland Sea, the Labrador Sea, the Irminger Sea
Abstract Variation in locations of the maximum development of deep convection in the subpolar seas, taking into account their small dimensions, represent difficulty in identifying its interannual variability from usually sparse in situ data. In this work, the interannual variability of the maximum convection depth, is obtained using one of the most complete datasets ARMOR, which combines in situ and satellite data. The convection depths, derived from ARMOR, are used for testing the efficiency of two indices of convection intensity: (1) sea-level anomalies from satellite altimetry and (2) the integral water density in the areas of the most frequent development of deep convection. The first index, capturing some details, shows low correlations with the interannual variability of the deep convection intensity. The second index shows high correlation with the deep convection intensity in the Greenland, Irminger and Labrador seas. Asynchronous variations in the deep convection intensity in the Labrador-Irminger seas and in the Greenland Sea are obtained. In the Labrador and in the Irminger seas, the quasi-seven-year variations in the convection intensity are identified.
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Funding Approved $loc['no']
Call Number COAPS @ user @ Serial 1089
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Author Hu, Z.-Z.; Huang, B.; Kinter, J.L.; Wu, Z.; Kumar, A.
Title Connection of the stratospheric QBO with global atmospheric general circulation and tropical SST. Part II: interdecadal variations Type $loc['typeJournal Article']
Year 2012 Publication Climate Dynamics Abbreviated Journal Clim Dyn
Volume 38 Issue 1-2 Pages 25-43
Keywords Stratospheric QBO; Tropical Pacific SST; Interdecadal variation; Walker circulation; Tropical deep convection; ERA40 and NCEP/NCAR reanalyses; ENSO
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Series Editor Series Title Abbreviated Series Title
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ISSN 0930-7575 ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @ Serial 260
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Author Huang, B.; Hu, Z.-Z.; Kinter, J.L.; Wu, Z.; Kumar, A.
Title Connection of stratospheric QBO with global atmospheric general circulation and tropical SST. Part I: methodology and composite life cycle Type $loc['typeJournal Article']
Year 2012 Publication Climate Dynamics Abbreviated Journal Clim Dyn
Volume 38 Issue 1-2 Pages 1-23
Keywords Stratospheric QBO; Tropical Pacific SST; Walker circulation; Deep convection; Atmospheric stability; ERA40 and NCEP/NCAR reanalyses
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0930-7575 ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @ Serial 259
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Author Zou, S.; Lozier, M.S.; Xu, X.
Title Latitudinal Structure of the Meridional Overturning Circulation Variability on Interannual to Decadal Time Scales in the North Atlantic Ocean Type $loc['typeJournal Article']
Year 2020 Publication Journal of Climate Abbreviated Journal J. Climate
Volume 33 Issue 9 Pages 3845-3862
Keywords Deep convection; Ocean circulation; Thermocline circulation
Abstract The latitudinal structure of the Atlantic meridional overturning circulation (AMOC) variability in the North Atlantic is investigated using numerical results from three ocean circulation simulations over the past four to five decades. We show that AMOC variability south of the Labrador Sea (53°N) to 25°N can be decomposed into a latitudinally coherent component and a gyre-opposing component. The latitudinally coherent component contains both decadal and interannual variabilities. The coherent decadal AMOC variability originates in the subpolar region and is reflected by the zonal density gradient in that basin. It is further shown to be linked to persistent North Atlantic Oscillation (NAO) conditions in all three models. The interannual AMOC variability contained in the latitudinally coherent component is shown to be driven by westerlies in the transition region between the subpolar and the subtropical gyre (40°50°N), through significant responses in Ekman transport. Finally, the gyre-opposing component principally varies on interannual time scales and responds to local wind variability related to the annual NAO. The contribution of these components to the total AMOC variability is latitude-dependent: 1) in the subpolar region, all models show that the latitudinally coherent component dominates AMOC variability on interannual to decadal time scales, with little contribution from the gyre-opposing component, and 2) in the subtropical region, the gyre-opposing component explains a majority of the interannual AMOC variability in two models, while in the other model, the contributions from the coherent and the gyre-opposing components are comparable. These results provide a quantitative decomposition of AMOC variability across latitudes and shed light on the linkage between different AMOC variability components and atmospheric forcing mechanisms.
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ISSN 0894-8755 ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ user @ Serial 1106
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