HNLC

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Areas with high nutrient concentrations, here the phosphate concentration as an example. Areas colored red stand for high, purple colored areas stand for low nutrient concentrations. Specified in millimoles of phosphate per cubic meter.
Global distribution of the marine chorophyll concentration as an average for the period January 1998 to December 2006. Red areas correspond to high concentrations, purple areas to low concentrations. Specified in milligrams of chlorophyll per cubic meter. The chlorophyll concentration serves as an indicator for the amount of phytoplankton present. Note the logarithmic division of the color scaling.

HNLC ( English high nutrient low chlorophyll ) is in the marine Geosciences an acronym for marine areas, by a lack of chlorophyllhaltigem phytoplankton stand out ( English low chlorophyll ), although the sea water in them rich in the main nutrients nitrate and phosphate is (engl. High nutrient ). This phenomenon is attributed to the lack of micronutrients such as iron . Extensive regions in which these conditions occur are upwelling areas , such as the South Ocean , the North Pacific or the areas of the Pacific near the equator .

See also

literature

  • Phoebe J. Lam, James KB Bishop: The continental margin is a key source of iron to the HNLC North Pacific Ocean. In: Geophysical Research Lett. , 35, 2008, S. L07608, doi: 10.1029 / 2008GL033294 .

Individual evidence

  1. ↑ Inga Hense: Plankton dynamics in the Southern Ocean: numerical investigations with a hierarchy of biological-physical models . Bremen 2002, DNB  964278588 , hdl: 10013 / epic.15753 (dissertation, University of Bremen).