Program and Agenda

Abstract

ATLANTIC EQUATORIAL MARINE SNOWFALL AND DEEP PARTICLE MAXIMA

Equatorial upwelling is driving centers of high productivity in the open and otherwise highly stratified Tropical Ocean. Relatively high-export fluxes are observed at the equator. We here provide the first high-resolution full-depth particle size spectra (0.05 mm to 2.66 mm, Underwater Vision Profiler) and coinciding current profiles (lowered-ADCP) across the equator from 5ºN to 5ºS at 23ºW (Atlantic Ocean) observed in November 2012. Latitudinal extent of the particle biovolume (particle size 0.05 to 2.63 mm) was observed from ~1ºN to ~2.5ºS at 2000 m depth. A pronounced subsurface maximum was observed at about 450 m depth (1ºS to 0.5 ºN), which is located at the core of the Equatorial Intermediate Current (EIC). The Northern Intermediate Counter Current (NICC) also carries a strong particle signal. Recent biogeochemical models are not able reproduce these particle maxima. Particle backtracking reveals that zonal equatorial currents mainly structure the particle distribution. A V-shaped origin of modeled particles sinking at 1m/s in the EIC could indicate that meridional transport processes are also involved in the establishment of the deep-particle maximum.

ePoster:

Authors

Kiko, R., GEOMAR Helmholtz-Zentrum f. Ozeanforschung Kiel, Germany, rkiko@geomar.de

Hauss, H., GEOMAR Helmholtz-Zentrum f. Ozeanforschung Kiel, Germany, hhauss@geomar.de

Schwarzkopf, F., GEOMAR Helmholtz-Zentrum f. Ozeanforschung Kiel, Germany, fschwarzkopf@geomar.de

Brandt, P., GEOMAR Helmholtz-Zentrum f. Ozeanforschung Kiel, Germany, pbrandt@geomar.de

Stemmann, L., Laboratoire Oceanographique Villefranche, France, stemmann@obs-vlfr.fr

Details

Poster presentation

Session #:026
Date: 2/24/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 1035