作者: Jinchun Yuan , Alan M Shiller
DOI: 10.1016/S0967-0645(01)00026-1
关键词: Diel vertical migration 、 Hydrogen peroxide 、 Mixed layer 、 Latitude 、 Total organic carbon 、 Seawater 、 Chemistry 、 Plume 、 Oceanography 、 Hydrogen
摘要: Abstract The near-surface distribution and processes controlling the of hydrogen peroxide were examined in South central Atlantic Ocean during a transect from Uruguay to Barbados May June 1996. Four kinds field experiments conducted cruise including diel observations, dark decay experiments, photochemical production peroxide-enrichment experiments. Significant variations (∼25 nM) observed, with surface-water concentrations increasing day decreasing at night. With half-life 5.5 days net rate 8.3 nM/h local noon, it appears that both photo-production are much smaller oligotrophic seawater than coastal seawater. experimental results indicate that: (1) reaction is second-order over all, first-order concentration colloidal material; (2) study area could restore its ambient levels about 4 d after external perturbations. A total 20 vertical profiles obtained 11 stations can be classified as: surface maximum, mixed, sub-surface maximum. Generally, H 2 O decreased depth less 5 nM below 200 m. Hydrogen also was determined some water samples 200 m, which revealed slight increase depth. In waters open ocean, increased latitude 24 nM south (33.8°S) 80 nM north (8.9°N). This latitudinal variation correlated model-calculated solar irradiance, satellite-measured wet deposition, mixed layer, possibly organic carbon. water-column inventory varied 1.5 6.3×10 −3 mol/m . Although greatest shallow observed Amazon plume, these showed dramatic decrease integrated-water-column not significantly higher ocean stations.