Gulf of alaska two oceans meet but dont mix ammonia

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gulf of alaska two oceans meet but dont mix ammonia

Mar 16, Effects of melting glaciers on nutrient flux to the Gulf of Alaska . is constant mixing at the plate boundary in the Gulf of Alaska (Hales, The edge of the Copper River plume (Figure 2) is where the iron-limited and nitrate-limited waters meet to . and ammonia overload, the same as dump sites in the ocean. Niche differentiation of the ammonia-oxidizing archaea (AOA) from the in both the North Atlantic (Agogué et al., ) and Polar oceans (Galand et al., Stns 1 and 5 are both located near to the Bussol Strait where strong vertical mixing .. Gulf of California (GOC) (Beman et al., ), the Atlantic Ocean ( Wuchter et. Apr 19, Originally Answered: Why do two oceans meet, but do not mix at the Gulf of Why Don't the Waters of Atlantic and Pacific Ocean Mix at their Meeting Point.

Inscientists announced that for the first time, they had obtained photographic evidence of this glow. The pelagic zone includes all open ocean regions, and can be divided into further regions categorized by depth and light abundance.

Because plants require photosynthesislife found deeper than the photic zone must either rely on material sinking from above see marine snow or find another energy source. The pelagic part of the photic zone is known as the epipelagic. The pelagic part of the aphotic zone can be further divided into vertical regions according to temperature.

The mesopelagic is the uppermost region. The last zone includes the deep oceanic trenchand is known as the hadalpelagic. The benthic zones are aphotic and correspond to the three deepest zones of the deep-sea. Lastly, the hadal zone corresponds to the hadalpelagic zone, which is found in oceanic trenches.

gulf of alaska two oceans meet but dont mix ammonia

The pelagic zone can be further subdivided into two subregions: The neritic zone encompasses the water mass directly above the continental shelves whereas the oceanic zone includes all the completely open water.

In contrast, the littoral zone covers the region between low and high tide and represents the transitional area between marine and terrestrial conditions. It is also known as the intertidal zone because it is the area where tide level affects the conditions of the region. If a zone undergoes dramatic changes in temperature with depth, it contains a thermocline.

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The tropical thermocline is typically deeper than the thermocline at higher latitudes. Polar waters, which receive relatively little solar energy, are not stratified by temperature and generally lack a thermocline because surface water at polar latitudes are nearly as cold as water at greater depths.

Because this deep and cold layer contains the bulk of ocean water, the average temperature of the world ocean is 3. If a zone undergoes a strong, vertical chemistry gradient with depth, it contains a chemocline.

The halocline often coincides with the thermocline, and the combination produces a pronounced pycnocline.

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While these changes will not be enough to compensate for the nutrients supplied by the Copper Plume, they may help slow the decline and raise the level of eventual stabilization. One of these solutions is to try to restore natural nutrient balance in the Copper River Watershed. Salmon returning to their spawning streams "provide marine-derived nutrients that support the web of life within the watershed" Ecotrust b.

These nutrients include carbon, nitrogen, and most importantly, iron Helfman and Collette, While plants and other life in the watershed will take some of these nutrients up, the rest will be swept out to sea.

We propose to complement the nutrient supply from salmon that swim upstream and die with waste from the salmon caught at sea. Cannery waste is currently dumped at one location in Cordova, in such high concentrations it releases ammonia as it decomposes Hansen, and could create anoxic environmental conditions Sarmiento, et al. If this waste were to be distributed between the tributaries of the Copper River, it would still provide nutrients without sitting in a toxic lump in Orca Inlet.

The distribution would be balanced between spawning streams—where the nutrients can be taken up by fry and fish as they die—and streams without a spawning population, where the nutrients will be more likely to be swept downstream to the ocean. Such waste will be dumped, in accordance with current regulations, in the form of small, one half inch chunks EPA, However, it may be more efficient to dump unprocessed fish waste.

At least one study found that dumping "unground fish heads and carcasses" into an experimental site located in a trench "revealed that the heads and carcasses were rapidly dispersed and incorporated into the food chain. Such waste dumping would most likely take place in the summer, during the fishing season, when the canneries are actively producing fish waste in order to avoid the problem of storage.

The responsibility of distributing the waste would most feasibly go to Alaska Department of Fish and Game, who could charter planes from private owners in and around Cordova. This would also create jobs for the pilots, helping to alleviate the potential job loss of fishermen.

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Like any solution, this method is not without risks. Excessive dumping could trigger anoxia and ammonia overload, the same as dump sites in the ocean. If anything, the effect would be magnified as a result of the smaller size and reduced circulation in a lake.

gulf of alaska two oceans meet but dont mix ammonia

To prevent such conditions, monitoring would have to take place, most feasibly by having the crews that distribute fish waste also take water samples at their sites, and respond appropriately to the information gleaned. Dissolved oxygen and ammonia levels would be important variables to monitor, along with other potentially harmful chemicals and conditions created by the decomposition.

The optimal time of implementation would be just before the projected downturn in nutrient flow, in approximately fifty years. If we choose to make sure the situation is indeed developing before putting our plan into effect, continuous monitoring must take place, both of nutrient levels within the Copper River and of the overall volume of the plume.

Satellite images of the plume and estimates of the water level could both serve to estimate size of the plume, while water samples can be tested for nutrient content. Upon detecting a drop, the plan would be put into place. Even with an increased supply of decomposing salmon, the runs will be depleted.

gulf of alaska two oceans meet but dont mix ammonia

In order to maintain having any run at all, fishing will have to decrease with the population of salmon. In order to keep income at a high enough level to live on the profits, we may have to rely simply on supply and demand. The smaller run size will likely result in increased prices, keeping the income for Cordovan fishermen more level.

Even with such an increase in price, however, the population of Cordova, and other fishing towns that depend on salmon supported by the plume will likely experience an economic downturn, followed by a decrease in fleet size and population.

Effects of melting glaciers on nutrient flux to the Gulf of Alaska

If none of this happens—if the iron supply does not fluctuate at all—then our proposed action will still provide a nutrient increase. Adverse affects are likely to be minimal, if there are any. Since we are effectively restoring, or possibly enhancing the natural balance of nutrients, the nutrient replacement should still promote the salmon run even if the projected changes happen slower, faster, or not at all. Conclusion Although an iron influx in the Copper River Plume will provide short-term benefits for Cordova's commercial fishing industry, economic and cultural devastation may occur if the glaciers of the Copper River Watershed significantly decrease in mass.

Our proposal to recycle nutrients existent in cannery waste will work to alleviate this potential occurrence. In a town whose livelihood is dependent on the resources available in the Gulf of Alaska, steps must be taken in order to ensure that such a livelihood continues to thrive. Figures and Tables Source: Bruland Research Lab b Figure 2. The Copper River Plume Source: NASA a Figure 3. This image is a composite from a 6-day period centered around July 30, Bruland Research Lab b Figure 4.

Zooplankton biomass in the Gulf of Alaska Source: Brodeur and Ware, a Figure 5. ADFG a Figure 6. The Biogeochemistry of glacial and spring-fed streams in the Copper River watershed, south Alaska. Science Volp.

Fundamentals of Aquatic Ecology. Long term variability in zooplankton biomass in the subarctic Pacific Ocean.

gulf of alaska two oceans meet but dont mix ammonia

Bruland Research Lab a. Bruland Research Lab b.

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Cordova District Fishermen United. Climate Change Science Facts. American Geological Institute's Glossary of Geology. The Little Ice Age: How Climate Made History, Helfman, G, and B. Blackwell Science, pg Glacier mass-balance fluctuations in the Pacific Northwest and Alaska. Geological Survey Professional Paper A, 23 p. The Gulf of Alaska: Thorne, R, and M. Ulmer, F, and G. In our study, geographic distribution of the AOA from the surface photic zone to the deep bathypelagic waters in the western subarctic Pacific adjacent to the Kuril Islands was investigated using pyrosequencing based on the ammonia monooxygenase subunit A amoA gene.

Genotypes of clusters A and B dominated in the upper euphotic zone and the deep waters, respectively. Quantitative PCR assays revealed that the occurrence and ammonia-oxidizing activity of ammonia-oxidizing archaea AOA reached their maxima at the depth of m, where a higher diversity and abundance of actively transcribed AOA was observed at the station located in the marginal sea exposed to more terrestrial input.

Similar community composition of AOA observed at the two stations adjacent to the Kuril Islands maybe due to water exchange across the Bussol Strait. They distinct from the station located in the western subarctic gyre, where sub-cluster WCAII had a specific distribution in the surface water, and this sub-cluster seemed having a confined distribution in the western Pacific.

Habitat-specific groupings of different WCB sub-clusters were observed reflecting the isolated microevolution existed in cluster WCB. The effect of the Kuril Islands on the phylogenetic composition of AOA between the Sea of Okhotsk and the western subarctic Pacific is not obvious, possibly because our sampling stations are near to the Bussol Strait, the main gateway through which water is exchanged between the Sea of Okhotsk and the Pacific.

The vertical and horizontal distribution patterns of AOA communities among stations along the Kuril Islands were essentially determined by the in situ prevailing physicochemical gradients along the two dimensions.