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The warming of the atmosphere is expected to result in intensified atmospheric pressure gradients. There is already some evidence that this has resulted in increasing storm frequency and intensity in recent years. Atmospheric conditions are largely responsible for surface currents, which transport water in the surface layers of the ocean where most of the biomass resides (Harley, 2006). Modeling predicts that advection and upwelling will increase as a result of global warming, especially in the eastern boundary currents. Increased advection is generally linked to decreased biomass. Upwelling can often increase the biomass as it provides a source of cold, nutrient-rich water to the surface, but a strong upwelling current can also be disruptive. It is also suggested that global warming could increase thermal stratification, which would decrease upwelling (Harley, 2006).
Changes in conditions of water due to climate change will likely change the distribution of many species. For instance as temperature rises, many species will begin shift towards higher latitudes in order to remain under similar environmental conditions (Harley, 2006). This shifting of species allows for the introduction of alien species to ecosystems where they were not previously present, thus having the potential to greatly change the ecosystem. For instance, huge swarms of mauve stingers (Pelagia nocticula), which can devastate populations of fish, are becoming common in the waters off of Britain, a location where they were rarely spotted decades ago (CNN, 2007).
Another adverse effect from global warming is coral bleaching. The impact of coral bleaching is most obvious in fish, which feed specifically on corals, as do most butterfly fishes. The fish were gradually starving to death and the decline in numbers indicated they had also failed to breed in the months and years following the destruction of their reef. Coral bleaching is caused by high water temperatures that cause the corals to shed their symbiotic bacteria and die. More than 30% of coral reefs throughout the world are already severely degraded and corals on 60% may be lost by 2030 due significantly to bleaching as the climate warms (ARC, 2007).
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Collins, M., (2005),. El Nino- or La Nina-like climate change? Climate Dynamics, 24, 89-104.
CNN.com, (2007). Billions of jellyfish wipe out N. Irish Salmon Farm. http://www.cnn.com/2007/WORLD/europe/11/21/salmon.jellyfish.ap/index.html. 
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Wells, B. K., Grimes, C. B., Waldvogel, J. B., (2007). Quantifying the effects of wind, upwelling, curl, sea surface temperature and sea level height on growth and maturation of a California Chinook salmon (Oncorhynchus tshawytscha) population. Fisheries Oceanography, 16 (4), 363--382.
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Zhang, Q., Yang, H., Zhong, Y., et all (2005). An idealized study of the impact of extratropical climate change on El Nino--880.