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  • American Meteorological Society  (4)
  • 1
    Online Resource
    Online Resource
    Seasonal Flow Reversals of Intermediate Waters in the Canary Current System East of the Canary Islands
    American Meteorological Society ; 2010
    In:  Journal of Physical Oceanography Vol. 40, No. 8 ( 2010-08-01), p. 1902-1909
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 40, No. 8 ( 2010-08-01), p. 1902-1909
    Abstract: Two 9-yr current-meter and salinity records, together with climatological data, reveal marked seasonal variability of the intermediate flow at a key location in the Canary Basin. The region is characterized by a summer (July–September) and early fall (October) northward progression of Antarctic Intermediate Water followed by a fall (November–December) intense flow reversal of Mediterranean Water. A Sverdrup-type model confirms that these movements are associated with stretching or shrinking of the intermediate water strata.
    Type of Medium: Online Resource
    ISSN: 1520-0485 , 0022-3670
    URL: Article
    DOI: 10.1175/2010JPO4320.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2010
    detail.hit.zdb_id: 2042184-9
    detail.hit.zdb_id: 184162-2
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    Online Resource
  • 2
    Online Resource
    Online Resource
    A Simple Nonlinear and End-Member-Free Approach for Obtaining Ocean Remineralization Patterns
    American Meteorological Society ; 2017
    In:  Journal of Atmospheric and Oceanic Technology Vol. 34, No. 11 ( 2017-11), p. 2443-2455
    Details
    In: Journal of Atmospheric and Oceanic Technology, American Meteorological Society, Vol. 34, No. 11 ( 2017-11), p. 2443-2455
    Abstract: The variability of a biogeochemical property in the ocean is the outcome of both nonconservative (such as respiration and photosynthesis) and conservative (mixing of water masses with distinct concentrations at origin) processes. One method to separate both contributions is based on a multiple regression of the biogeochemical property in terms of temperature θ and salinity S as conservative proxies of water masses. This regression delivers the variability related to the conservative fraction and hence allows for identifying the residual as the biogeochemical anomaly. Here, the standard multiple linear regression (MLR) method, which assumes that water masses mix locally and linearly, is compared with a nonlinear polynomial regression (PR) over the entire ( θ , S ) space. The PR method has two important advantages over MLR: allows for simultaneous nonlinear mixing of all water masses and does not require knowing the end-member water types. Both approaches are applied to data along 7.5°N in the equatorial Atlantic Ocean, and the biogeochemical anomalies are calculated for humic-like fluorescent dissolved organic matter, apparent oxygen utilization, and nitrate—all of them related through in situ remineralization processes. The goodness of both approaches is assessed by analyzing the linear dependence and the coefficient of correlation between the anomalies. The results show that the PR method can be applied over the entire water column and yet retains the local variability associated with nonconservative processes. The potential of the PR approach is also illustrated by calculating the oxygen–nitrate stoichiometric ratio for the entire 7.5°N transatlantic section.
    Type of Medium: Online Resource
    ISSN: 0739-0572 , 1520-0426
    URL: Article
    URL: Article
    DOI: 10.1175/JTECH-D-17-0090.1
    DOI: 10.1175/JTECH-D-17-0090.s1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2017
    detail.hit.zdb_id: 2021720-1
    detail.hit.zdb_id: 48441-6
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  • 3
    Online Resource
    Online Resource
    Upper-Ocean Circulation and Tropical Atlantic Interannual Modes
    American Meteorological Society ; 2023
    In:  Journal of Climate Vol. 36, No. 8 ( 2023-04-15), p. 2625-2643
    Details
    In: Journal of Climate, American Meteorological Society, Vol. 36, No. 8 ( 2023-04-15), p. 2625-2643
    Abstract: The impact of tropical Atlantic Ocean variability modes in the variability of the upper-ocean circulation has been investigated. For this purpose, we use three oceanic reanalyses, an interannual forced-ocean simulation, and satellite data for the period 1982–2018. We have explored the changes in the main surface and subsurface ocean currents during the emergence of Atlantic meridional mode (AMM), Atlantic zonal mode (AZM), and AMM–AZM connection. The developing phase of the AMM is associated with a boreal spring intensification of North Equatorial Countercurrent (NECC) and a reinforced summer Eastern Equatorial Undercurrent (EEUC) and north South Equatorial Current (nSEC). During the decaying phase, the reduction of the wind forcing and zonal sea surface height gradient produces a weakening of surface circulation. For the connected AMM–AZM, in addition to the intensified NECC, EEUC, and nSEC in spring, an anomalous north-equatorial wind curl excites an oceanic Rossby wave (RW) that is boundary-reflected into an equatorial Kelvin wave (KW). The KW reverses the thermocline slope, weakening the nSEC and EUC in boreal summer and autumn, respectively. During the developing spring phase of the AZM, the nSEC is considerably reduced with no consistent impact at subsurface levels. During the autumn decaying phase, the upwelling RW-reflected mechanism is activated, modifying the zonal pressure gradient that intensifies the nSEC. The NECC is reduced in boreal spring–summer. Our results reveal a robust alteration of the upper-ocean circulation during AMM, AZM, and AMM–AZM, highlighting the decisive role of ocean waves in connecting the tropical and equatorial ocean transport.
    Type of Medium: Online Resource
    ISSN: 0894-8755 , 1520-0442
    URL: Article
    URL: Article
    DOI: 10.1175/JCLI-D-22-0184.1
    DOI: 10.1175/JCLI-D-22-0184.s1
    RVK:
    UA 4548
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2023
    detail.hit.zdb_id: 246750-1
    detail.hit.zdb_id: 2021723-7
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  • 4
    Online Resource
    Online Resource
    A Simple Method for Estimating Horizontal Diffusivity
    American Meteorological Society ; 2023
    In:  Journal of Atmospheric and Oceanic Technology Vol. 40, No. 6 ( 2023-06), p. 739-752
    Details
    In: Journal of Atmospheric and Oceanic Technology, American Meteorological Society, Vol. 40, No. 6 ( 2023-06), p. 739-752
    Abstract: A common dilemma for oceanographers is the choice of horizontal diffusivity. There is no single answer as we could argue that diffusion depends precisely on those processes that cannot be sampled or modeled. Here we propose the radial offset by diffusion (ROD) method as a simple model-dependent approach for estimating these coefficients, and show its application for the southwestern South Atlantic. The method compares actual displacements of field drifters with numerical trajectory predictions. The observed–predicted differences in radial positions (radial offsets), which respond to diffusive motions not captured by the numerical model, are reproduced with a one-dimensional radial-diffusive solution through a proper selection of the diffusion coefficient. The method is tested at eight depths, from the sea surface down to 2000 m, using several drifter datasets and the Parcels software applied to the GLORYS12v1 (1/12° daily) velocity outputs. In all cases the radial offsets show Gaussian distributions that are well reproduced by the radial diffusive solution. Maximum diffusivities of 4630–4980 m 2 s −1 happen in the upper 200 m of the water column and minimum values of 1080–1270 m 2 s −1 occur between 1400 and 2000 m. The 15-m diffusivity is fairly constant in latitude (3850–5270 m 2 s −1 ), but the 1000-m diffusivity decreases from 1640 to 1820 m 2 s −1 north of the Polar Front to 530 m 2 s −1 south of the Southern Boundary. A comparison with other diffusivity studies validates the good adequacy of the ROD method for numerical and field applications.
    Type of Medium: Online Resource
    ISSN: 0739-0572 , 1520-0426
    URL: Article
    URL: Article
    DOI: 10.1175/JTECH-D-22-0097.1
    DOI: 10.1175/JTECH-D-22-0097.s1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2023
    detail.hit.zdb_id: 2021720-1
    detail.hit.zdb_id: 48441-6
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