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  • 1
    Online Resource
    Online Resource
    Analysis of horizontal and vertical processes contributing to natural iron supply in the mixed layer in southern Drake Passage
    Elsevier BV ; 2013
    In:  Deep Sea Research Part II: Topical Studies in Oceanography Vol. 90 ( 2013-6), p. 68-76
    Details
    In: Deep Sea Research Part II: Topical Studies in Oceanography, Elsevier BV, Vol. 90 ( 2013-6), p. 68-76
    Type of Medium: Online Resource
    ISSN: 0967-0645
    URL: Article
    DOI: 10.1016/j.dsr2.2012.06.001
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2013
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    SSG: 14
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  • 2
    Online Resource
    Online Resource
    Global correlation of mesoscale ocean variability with seafloor roughness from satellite altimetry
    American Geophysical Union (AGU) ; 2000
    In:  Geophysical Research Letters Vol. 27, No. 9 ( 2000-05-01), p. 1251-1254
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 27, No. 9 ( 2000-05-01), p. 1251-1254
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/1999GL007003
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2000
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    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    High-Latitude Ocean and Sea Ice Surface Fluxes: Challenges for Climate Research
    American Meteorological Society ; 2013
    In:  Bulletin of the American Meteorological Society Vol. 94, No. 3 ( 2013-03), p. 403-423
    Details
    In: Bulletin of the American Meteorological Society, American Meteorological Society, Vol. 94, No. 3 ( 2013-03), p. 403-423
    Type of Medium: Online Resource
    ISSN: 0003-0007 , 1520-0477
    URL: Article
    DOI: 10.1175/BAMS-D-11-00244.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2013
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  • 4
    Online Resource
    Online Resource
    Assessment of ICESat-2 for the recovery of ocean topography
    Oxford University Press (OUP) ; 2021
    In:  Geophysical Journal International Vol. 226, No. 1 ( 2021-05-06), p. 456-467
    Details
    In: Geophysical Journal International, Oxford University Press (OUP), Vol. 226, No. 1 ( 2021-05-06), p. 456-467
    Abstract: The Ice, Cloud and land Elevation Satellite 2 (ICESat-2) laser altimetry mission, launched in September 2018, uses six parallel lidar tracks with very fine along-track resolution (15 m) to measure the topography of ice, land and ocean surfaces. Here we assess the ability of ICESat-2 ocean data to recover oceanographic signals ranging from surface gravity waves to the marine geoid. We focus on a region in the tropical Pacific and study photon height data in both the wavenumber and space domain. Results show that an ICESat-2 single track can recover the marine geoid at wavelengths & gt;20 km which is similar to the best radar altimeter data. The wavelength and propagation direction of surface gravity waves are sometimes well resolved by using a combination of the strong and weak beams, which are separated by 90 m. We find higher than expected power in the 3–20 km wavelength band where geoid and ocean signals should be small. This artificial power is caused by the projection of 2-D surface waves with ∼300 m wavelengths into longer wavelengths (5–10 km) because of the 1-D sampling along the narrow ICESat-2 profile. Thus ICESat-2 will not provide major improvements to the geoid recovery in most of the ocean.
    Type of Medium: Online Resource
    ISSN: 0956-540X , 1365-246X
    URL: Article
    DOI: 10.1093/gji/ggab084
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2021
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  • 5
    Online Resource
    Online Resource
    Antarctic Circumpolar Current response to zonally averaged winds
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Oceans Vol. 106, No. C2 ( 2001-02-15), p. 2743-2759
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 106, No. C2 ( 2001-02-15), p. 2743-2759
    Abstract: Coherence analysis techniques are used to compare Southern Ocean wind forcing with Antarctic Circumpolar Current transport. Winds are derived from five different products: ERS winds that have been bin‐averaged, weekly gridded ERS winds produced by the Centre ERS d'Archivage et de Traitement, 5 day winds from the Special Sensor Microwave Imager, analysis winds from the European Centre for Medium‐Range Weather Forecasts, and reanalysis winds from the National Centers for Environmental Prediction. Barotropic transport is estimated from the pressure difference between bottom pressure gauges deployed on either side of Drake Passage by Proudman Oceanographic Laboratory as part of the World Ocean Circulation Experiment. Surface transport is estimated from TOPEX altimetry. Results indicate that transport and wind forcing are coherent over a broad range of frequencies, corresponding to time periods of roughly 10–256 days. Highest coherences occur for winds at latitudes on the south side of Drake Passage. Barotropic ocean transport lags wind forcing not by a constant time interval but by a constant phase lag of about one eighteenth of a cycle at a broad range of frequencies, suggesting that the oceanic response to wind is controlled by both the tendency term and a frequency‐dependent viscous process. Surface transport lags by a longer phase interval. Wind stress curl north of Drake Passage is more coherent with transport than is wind stress curl in the latitudes of Drake Passage. Ocean transport lags wind stress curl, suggesting that transport fluctuations are not governed by a simple Sverdrupian vorticity balance. Like the observations, general circulation model transports from the Parallel Ocean Program and from the Parallel Ocean Climate Model are coherent with wind stress from the south side of Drake Passage and with wind stress curl from latitudes north of Drake Passage. Unlike the observations, model transport and bottom pressure vary almost simultaneously with the wind and do not replicate the observed phase lags, implying that the effective model viscosity may be too large.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/1999JC900333
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    Bathymetry from space is now possible
    American Geophysical Union (AGU) ; 2003
    In:  Eos, Transactions American Geophysical Union Vol. 84, No. 5 ( 2003-02-04), p. 37-44
    Details
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 84, No. 5 ( 2003-02-04), p. 37-44
    Abstract: A new satellite altimeter mission to map the deep ocean bathymetry and gravity field five times better than existing global maps is being considered. This mission, which would be 16 times faster and cheaper than mapping the sea floor with conventional multibeam systems, would be used to probe the internal structure of the continental margins, and estimate sea floor topography and roughness spectra for geological, oceanographic, and climatological purposes (see boxed sidebar). Of course, the highest‐resolution bathymetry maps come from shipboard systems, but so far, only 10% of the sea floor has been surveyed, and it will take 125 ship‐years to map the deep oceans at a cost of about one billion dollars. The accuracy of current altimeter‐derived maps is limited by ranging noise and short mission duration. A new altimeter with improved technology and a non‐repeating orbit could provide accuracy to 1 mGal within 6 years (http://fermi.jhuapl.edu/abyss). In the deep ocean, where there is little sediment cover, gravity and topography are highly correlated, so that gravity can be used to predict topography, but there is a fundamental resolution limit of π times the mean ocean depth, which is ∼12 km full‐wavelength, due to upward continuation. On the shallow continental margins, the gravity field reveals variations in sediment and crustal structure.
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Article
    DOI: 10.1029/2003EO050002
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2003
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  • 7
    Online Resource
    Online Resource
    An Assessment of the Southern Ocean Mixed Layer Heat Budget
    American Meteorological Society ; 2007
    In:  Journal of Climate Vol. 20, No. 17 ( 2007-09-01), p. 4425-4442
    Details
    In: Journal of Climate, American Meteorological Society, Vol. 20, No. 17 ( 2007-09-01), p. 4425-4442
    Abstract: The mixed layer heat balance in the Southern Ocean is examined by combining remotely sensed measurements and in situ observations from 1 June 2002 to 31 May 2006, coinciding with the period during which Advanced Microwave Scanning Radiometer-Earth Observing System (EOS) (AMSR-E) sea surface temperature measurements are available. Temperature/salinity profiles from Argo floats are used to derive the mixed layer depth. All terms in the heat budget are estimated directly from available data. The domain-averaged terms of oceanic heat advection, entrainment, diffusion, and air–sea flux are largely consistent with the evolution of the mixed layer temperature. The mixed layer temperature undergoes a strong seasonal cycle, which is largely attributed to the air–sea heat fluxes. Entrainment plays a secondary role. Oceanic advection also experiences a seasonal cycle, although it is relatively weak. Most of the seasonal variations in the advection term come from the Ekman advection, in contrast with western boundary current regions where geostrophic advection controls the total advection. Substantial imbalances exist in the regional heat budgets, especially near the northern boundary of the Antarctic Circumpolar Current. The biggest contributor to the surface heat budget error is thought to be the air–sea heat fluxes, because only limited Southern Hemisphere data are available for the reanalysis products, and hence these fluxes have large uncertainties. In particular, the lack of in situ measurements during winter is of fundamental concern. Sensitivity tests suggest that a proper representation of the mixed layer depth is important to close the budget. Salinity influences the stratification in the Southern Ocean; temperature alone provides an imperfect estimate of mixed layer depth and, because of this, also an imperfect estimate of the temperature of water entrained into the mixed layer from below.
    Type of Medium: Online Resource
    ISSN: 1520-0442 , 0894-8755
    URL: Article
    DOI: 10.1175/JCLI4259.1
    RVK:
    UA 4548
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2007
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  • 8
    Online Resource
    Online Resource
    Mean sea surface height of the Antarctic Circumpolar Current from Geosat data: Method and application
    American Geophysical Union (AGU) ; 1994
    In:  Journal of Geophysical Research: Oceans Vol. 99, No. C9 ( 1994-09-15), p. 18255-18273
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 99, No. C9 ( 1994-09-15), p. 18255-18273
    Abstract: The mean sea surface height across the Antarctic Circumpolar Current has been reconstructed from height variability measured by the Geosat altimeter without assuming prior knowledge of the geoid. For this study, an automated technique has been developed to estimate mean sea surface height for each satellite ground track using a meandering Gaussian jet model, and errors have been estimated using Monte Carlo simulation. The results are objectively mapped to produce a picture of the mean Subantarctic and Polar Fronts, which together comprise the major components of the Antarctic Circumpolar Current. The meandering jet model explains between 40% and 70% of the height variance along the jet axes. The results show that the fronts are substantially steered by topography and that the jets have an average Gaussian width of about 44 km in the meridional direction and meander about 75 km to either side of their mean locations. The average height difference across the Subantarctic Front (SAF) is 0.7 m and across the Polar Front (PF) 0.6 m. The mean widths of the fronts are correlated with the size of the baroclinic Rossby radius.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/94JC01172
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1994
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    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
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    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 9
    Online Resource
    Online Resource
    Estimates of wind energy input to the Ekman layer in the Southern Ocean from surface drifter data
    American Geophysical Union (AGU) ; 2009
    In:  Journal of Geophysical Research Vol. 114, No. C6 ( 2009-06-05)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 114, No. C6 ( 2009-06-05)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2008JC005170
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2009
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    detail.hit.zdb_id: 3094104-0
    detail.hit.zdb_id: 2130824-X
    detail.hit.zdb_id: 2016813-5
    detail.hit.zdb_id: 2016810-X
    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 10
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    Controls on the Boundary Between Thermally and Non‐Thermally Driven p CO 2 Regimes in the South Pacific
    American Geophysical Union (AGU) ; 2022
    In:  Geophysical Research Letters Vol. 49, No. 9 ( 2022-05-16)
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 49, No. 9 ( 2022-05-16)
    Abstract: Biogeochemical float data confirm that the leading driver of p CO 2 seasonality shifts with latitude in the southern subtropical gyre The boundary between p CO 2 regimes is primarily set by the poleward decrease in sea surface temperature (SST) seasonal cycle amplitude The reduction in SST seasonal cycle amplitude, in turn, is linked to the northern boundary of deep winter mixed layers
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Article
    DOI: 10.1029/2021GL095797
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2022
    detail.hit.zdb_id: 2021599-X
    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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