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Discussion papers
https://doi.org/10.5194/os-2019-58
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2019-58
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 28 Jun 2019

Submitted as: research article | 28 Jun 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).

Effect of Caribbean Water Incursion into the Gulf of Mexico derived from Absolute Dynamic Topography, Satellite Data, and Remotely – sensed Chlorophyll-a

Juan Antonio Delgado1,2,5, Joël Sudre3, Sorayda Tanahara1, Ivonne Montes4, José Martin Hernandez-Ayon5, and Alberto Zirino6 Juan Antonio Delgado et al.
  • 1Facultad de Ciencias Marinas, Universidad Autónoma de Baja California, Transpeninsular Tijuana-Ensenada, no. 3917, FraccionamientoPlayitas, CP 22860. Ensenada, Baja California, México
  • 2Instituto Tecnológico de Guaymas/ Tec. Nacional de México, Guaymas, Sonora, México
  • 3LEGOS, CNRS/IRD/UPS/CNES UMR 5566, 18 av. Ed Belin, 31401 Toulouse Cedex 9, France
  • 4Insitituto Geofísico del Perú. Lima, Perú
  • 5Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Transpeninsular Tijuana-Ensenada, no. 3917, Fraccionamiento Playitas, CP 22860. Ensenada, Baja California, México
  • 6Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA

Abstract. The dynamics of the Loop Current (LC) and the detached Loop Current eddies (LCE’s) dominate the Gulf of Mexico's (GoM) surface layers' circulation transporting Caribbean water (CW) into the GoM.  In this work, 25-years (1993–2017) of daily satellite data are used to investigate the variability of these physical processes and their effect on chlorophyll-a (Chl-a) concentrations from 1998–2017 including temporal changes, mean differences, and regional concentration tendencies. Physical variables analyzed are absolute dynamic topography (ADT), oceanic currents, and wind stress. From the ADT and oceanic current monthly climatologies, it is shown that there is an annual intrusion of the CW with an inward incursion that starts in spring, peaks in the summer (reaching to 26.58˚N and 88.32˚W) and then retreats in winter. Minimum surface Chl-a concentrations (<0.08 mg m−3) are found during the summer-autumn period inside the region of maximum incursion of the CW; the opposite is observed during the winter period when the Chl-a concentrations were at a maximum, e.g., >0.14 mg m−3. The three-year running averages of ADT 40-cm isoline reproduce qualitatively the climatological pattern of 25 years showing that before 2002 the CW was less intrusive. This suggests that from 2003 onward, larger volumes of oligotrophic waters from Caribbean Sea have invaded the western GoM and reduced mean surface Chl-a concentrations. A direct comparison between the 1998–2002 and 2009–2014 periods indicates that, in the latter time interval, Chl-a concentration over waters deeper than 250 m has decreased significantly.

Juan Antonio Delgado et al.
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Juan Antonio Delgado et al.
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Short summary
In this work, 25-years of daily satellite data of absolute dynamic topography (ADT) show that before 2002 the Caribbean Surface Water (CW) was less intrusive inside the Gulf of Mexico. Our results suggests that from 2003 onward, larger volumes of oligotrophic waters from Caribbean Sea have invaded the western GoM and reduced mean surface Chl-a concentrations. A direct comparison between the 1998–2002 and 2009–2014 periods indicates that, Chl-a concentration has decreased significantly.
In this work, 25-years of daily satellite data of absolute dynamic topography (ADT) show that...
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