Is the ocean losing nitrate?

Article Abstract:

The current estimates of the oceanic fixed-nitrogen budget may need to be revised after research indicating a lowering fixed nitrogen level and an unbalanced fixed-nitrogen budget because of increased denitrification. A balanced fixed nitrogen budget requires a large number of marine plant species which can use free nitrogen gas, the product of denitrification and current estimates do not support such a population. This time-varying fixed-nitrogen inventory could be partially responsible for variances in atmospheric carbon dioxide through lower plant productivity.

Composition, Nitrogen, Nitrogen fixation, Denitrification, Sea-water, Seawater

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Volcanic iron, CO2, ocean productivity and climate

Article Abstract:

The results of the IronEx II study indicate that the growth of unicellular marine diatoms can be significantly increased by adding nanomolar quantities of inorganic iron to surface water. The findings also suggest that oceanic pH may rise in response to increased iron supply on a timescale of tens of thousands of years. Moreover, increased iron flux due to volcanic dust should boost oceanic productivity and atmospheric oxygen.

Research, Atmospheric chemistry, Diatoms, Volcanic ash, tuff, etc., Volcanic rocks

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River plumes as a source of large-amplitude internal waves in the coastal ocean

Article Abstract:

Internal waves generated from the Columbia River plume are of similar amplitude and steepness to those generated over topography elsewhere in the coastal ocean. These plume-generated internal waves are large compared to the local water depth, and have important implications for biology and turbulent mixing though less energetic than some waves which propagate through deep water.

North America, Columbia River, Internal waves

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