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Global Warming Oceans' Role


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  • 25-Sep-10 DOMINATING ROLE OF OCEANS IN CLIMATE CHANGE
  • 19-Sep-09 Short-term climate prediction: An unrealistic project
  • SEPP SCIENCE EDITORIAL #28-2010
    (in TWTW Sep 25, 2010)

    Guest Editorial by Dr. Harrison "Jack" Schmitt

    DOMINATING ROLE OF OCEANS IN CLIMATE CHANGE

    Sep 25, 2010

    The scientific rationale behind the Environmental Protection Agency's proposed massive intrusion into American life in the name of fighting climate change has no scientific or constitutional justification. This hard left excursion into socialism, fully supported by the Congressional Leadership and the President, has no basis in observational science, as has been discussed previously relative to climate history, temperature, and carbon dioxide.

    In addition, oceans of the Earth play the dominant role in the perpetuation and mediation of naturally induced change of global climate.[1] Density variations linking the Northern and Southern Hemisphere portions of the Pacific and Atlantic Oceans through the Southern Ocean drive the primary circulation system that controls hemispheric and global climate. Differences in temperature and salt concentration produce these density variations that circulate heat around the planet. For the last several years in this circulating environment, the sea surface temperature of the oceans appears to be leveling off or decreasing[2] with no net heat increase for the last 58 years[3] and particularly since 2003[4] and possibly since 1990[5]. The long-term climatic implications of this recent broad scale cooling are not known.

    Density increase due to evaporation in the North Atlantic creates a salt-rich, cold, deepwater current that flows south to join the Antarctic Circumpolar Current. Upwelling from that Circumpolar Current brings nutrient and carbon dioxide-rich deep seawater into the upper Southern Ocean. This Southern Ocean water then moves north toward the equator where it joins a warm water current flowing from the North Pacific, through the tropics and the Indian Ocean, and then northward through the Atlantic to become the Gulf Stream. The Gulf Stream flows into the North Atlantic where, as part of a continuous process, winddriven evaporation increases salt concentration and density and feeds the deepwater flow back to the south. Natural interference in the normal functioning of the ocean conveyor can occur. For example, melting of Northern Hemisphere ice sheets, accumulation of melt-water behind ice dams, and abrupt fresh water inputs into the North Atlantic cause major disruptions in global ocean circulation.[6]

    The oceans both moderate and intensify weather and decadal climate trends due to their great capacity to store solar heat as well as their global current structure, slow mixing, salinity variations, wind interactions, and oscillatory changes in heat distribution over large volumes.[7] The Northern Pacific Decadal Oscillation (PDO),[8] the El Nino-La Nina Southern Pacific Oscillation (ENSO),[9] the long period anchovy-sardine Southern Pacific Oscillation,[10] the Gulf Stream Northern Atlantic Oscillation (NAO),[11] the Indonesian Through-Flow (ITF),[12] the Agulhas Current[13], and other related ocean currents and cycles have demonstrably large, decadal scale effects on regional as well as global climate.[14]

    Possibly the greatest oceanic influence on global climate results from the full hemispheric reach and scale of the Southern Ocean's Circumpolar Current as it circulates around Antarctica and between the continents of the Southern Hemisphere.[15] In particular, the northward migration of the cold to warm water front off South Africa during ice ages may restrict warm, salty water of the western Indian Ocean's Agulhas Current from entering the South Atlantic and eventually amplify ice age cooling in North America and Europe.[16]

    In several major portions of the global ocean heat conveyor, natural variations in heating, evaporation, freshwater input,[17] atmospheric convection, surface winds, and cloud cover can influence the position and strengths of related, but local ocean currents near the continents. This variation in current positioning, therefore, modifies carbon dioxide uptake and release, storm patterns, tropical cyclone frequency,[18] phytoplankton abundance,[19] drought conditions, and sea level rise that drive the reality of, as well as our perceptions of climate change.

    For example, since about 7000 years ago, sea level rise has averaged about eight inches (20cm) per century for a total of about 55 feet (16m).[20] This same approximate rate appears to have held from 1842 to the mid-1980s.[21] The trend in sea level rise between the early 1900s and 1940 showed no observable acceleration attributable to increasing atmospheric carbon dioxide.[22] Satellite data show an apparent 50% increase of this rate after 1992, but this presumably will slow again soon due to the effects of the current period of global cooling. If the current slow rate of long-term global warming should continue for 100 years, the total sea level rise attributable to worldwide glacier melting and ocean thermal expansion would be no more that about four inches (10cm).[23]

    Greenland's ice sheet also plays a cyclic role in sea level changes. In the 1950s, Greenland's glaciers retreated significantly only to advance again between 1970 and 1995,[24] a pattern of retreat and then advance repeated again between 1995 and 2006[25]. Predicting future sea level rise from short-term observation of Greenland's glaciers would seem to have little validity, particularly as there appears to be a half a decade lag in observable melting and accretion responses relative to global temperature variations[26]. The same conclusion now can be made relative to Himalayan glaciers.[27]

    There also seems to be little danger of a catastrophic melting of the East Antarctic Ice Sheet that would cause a major rise in sea level.[28] Great uncertainty also exists relative to the natural dynamics and history of the West Antarctic Ice Sheet with Ross Sea sedimentary cores suggesting that major cycles of ice cover changes have occurred over the last five million years.[29] Overall, short-term sea level changes relate more to local geological dynamics that to glacial variations.[30]

    Compilations of temperature changes in the oceans and seas, as preserved by oxygen isotope variations in shells from cores of bottom sediments, provide a record of natural oceanic reactions to cycles of major climate change back for 1.8 million years.[31] For example, geological analysis of sea level changes over the last 500,000 years show a remarkable correlation with major natural climate change.[32] These data further indicate that the Earth probably is approaching the peak of the warming portion of a normal climate cycle that began with the end of the last Ice Age, about 10, 000 years ago.[33]

    The oceans play the major role in removing carbon from the atmosphere. Seawater calcium and various inorganic and organic processes in the oceans fix carbon from dissolved carbon dioxide as calcium carbonate,[34] planktonic and benthic organisms, and inedible forms of suspended carbon[35]. In so doing, these processes constitute major factors in global cycles of atmospheric carbon dioxide concentration. Calcium availability in the oceans, in turn, relates to major geological dynamics, including mountain building, volcanism, river flows, and the growth, alteration, and destruction of crustal plates beneath the oceans.

    Over the last 28 million years, marked variations in precipitated seawater calcium isotopes, particularly beginning about 13 million years ago, indicate major changes in sources of calcium rather than major variations in the quantity of atmospheric carbon dioxide.[36] This change in seawater calcium isotopic makeup may relate to events that included the partial deglaciation of Antarctica[37]. As most plant activity requires carbon dioxide, low atmospheric carbon dioxide values would reduce the rate of biologically assisted rock weathering. A limit on such weathering may buffer minimum atmospheric carbon dioxide to between 150 and 250ppm by limiting levels of seawater calcium.[38]

    Significant introductions of calcium into the oceans from any source would be expected to result in a drawdown of atmospheric carbon dioxide to maintain chemical balances in local as well as global seawater. Ultimately, the history of seawater calcium concentrations may explain many of the long-term variations in carbon dioxide levels shown in various studies; however, correlations between calcium dynamics and carbon dioxide levels are not at sufficient geological resolution to make firm, dated correlations.

    Slightly increased acidification of the local environments of sea dwelling organisms in the oceans may occur related to the absorption of new emissions of carbon dioxide. On the other hand, in spite of extreme alarmist hand wringing to the contrary[39], loss of ocean carbon dioxide due to naturally rising temperature works to mitigate this trend as will the broad chemical buffering of ocean acidity by both organic and inorganic processes[40].

    Iron ion and iron complex concentrations in seawater, mediated by oxidation potential (Eh) and hydrogen ion concentration (pH or acidity), play an additional role in organic carbon fixation. Relatively simple laboratory experiments suggest that increases in ocean acidity might reduce availability of chelated iron in the life cycle of phytoplankton.[41] The complexity of this process in nature, however, and the many other variables that potentially would play a role in iron metabolism, indicate a need for a much more comprehensive experimental analysis before conclusions can be drawn.

    Exactly what may happen in specific ecosystems remains uncertain relative to small increases or decreases in the acidity of ocean habitats or the change in the ratios of dissolved oxygen and carbon dioxide. Coral reefs, for example, have been very adaptable over geologic time and extensive research strongly suggests that they adapt well, on a global scale, to climatic changes and the small associated chemical changes in the oceans.[42] So far, research indicates that some organisms benefit and some do not, as might be expected.[43] Indeed, this interplay between losses and gains has occurred many times in the geologic past as nature has continuously adjusted to climatic changes much greater than the slow warming occurring at present. The Earth's vast layers of carbonate rocks derived from carbon fixing organisms, including ancient, now dead coral reefs, as well as deeply submerged coral reefs on existing sea mounts,[44] show that the production and evolution of such organisms remains a continuous, if possibly, locally or regionally punctuated process.

    In the face of the overwhelming dominance of the oceans on climate variability, it would appear foolish in the extreme to give up liberties and incomes to politicians in Washington and at the United Nations in the name of "doing something" about slow climate change.

    The President, regulators, and Congress have chosen to try to push Americans along an extraordinarily dangerous path. That path includes unconstitutional usurpation of the rights of the people and the constitutionally reserved powers of the States as well as the ruin of economic stagnation. The Congress that takes office in 2011 absolutely must get this right!

    References can be found in the TWTW document for this Science Editorial.

    View The Week That Was in which this editorial appeared.

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    SEPP Science Editorial #29-2009
    (in TWTW Sep 19, 2009)

    S. Fred Singer, Chairman and President , Science and Environmental Policy Project (SEPP)

    Short-term climate prediction: An unrealistic project

    Sep 19, 2009

    Two widely acclaimed research papers have tried to explain the current lack of warming in terms of natural influences on climate, but have limited their discussion entirely to internal oscillations of the ocean atmosphere system. I do not find this explanation satisfactory. First, there is no theory to account for the various internal oscillations and they do not appear in current climate models. More to the point, the authors neglect the effect of any external forcing from variable solar activity. Yet geological evidence conclusively demonstrates such solar-forcing effects on climate; it is difficult to account in other ways for the detailed correlation, observed in stalagmites, between carbon-14, a cosmic-ray produced isotope, and oxygen-18, the conventional indicator of terrestrial climate. While the exact mechanism at work is not completely settled, it is quite unrealistic to assume that this well-established process, which operated for millennia during the Holocene, is no longer operating today. It is unreasonable also to assume also that two independent forcings are causing decadal-scale climate variations. I am therefore of the opinion that solar activity provides the trigger for the quasi-periodic internal oscillations, like PDO etc, -- which is not a new idea.

    In addition, both papers subscribe to the basic (and unsupported) IPCC claim of a substantial anthropogenic contribution from GH gases - contrary to the NIPCC summary report "Nature - Not Human Activity" Rules the Climate" http://www.sepp.org/publications/NIPCC_final.pdf

    1. "Long-term natural variability and 20th century climate change" by Kyle L. Swanson, George Sugihara, and Anastasios A. Tsonis; PNAS, 14 September 2009, 10.1073/pnas.0908699106 - expanding on their paper in GRL (2009)

    Abstract: Global mean temperature at the Earth's surface responds both to externally imposed forcings, such as those arising from anthropogenic greenhouse gases, as well as to natural modes of variability internal to the climate system. Variability associated with these latter processes, generally referred to as natural long-term climate variability, arises primarily from changes in oceanic circulation. Here we present a technique that objectively identifies the component of inter-decadal global mean surface temperature attributable to natural long-term climate variability. Removal of that hidden variability from the actual observed global mean surface temperature record delineates the externally forced climate signal, which is monotonic, accelerating warming during the 20th century.

    2. Keenlyside et al. 2008, Nature 453, 84 - 88 Coauthor Prof Mojib Latif, from the Leibniz Institute of Marine Sciences at Kiel University in Germany, has been looking at the influence of cyclical changes of ocean currents and temperatures in the Atlantic, a feature known as the North Atlantic Oscillation. When he factored these natural fluctuations into his global climate model, he found the results would bring the rise in average global temperatures to an abrupt halt. He told more than 1500 gathered in Geneva at the UN's World Climate Conference (WCC-3 Aug 31-Sept 4, 2009) that in the next few years a natural cooling trend would dominate over any warming caused by humans. The NAO is now moving into a colder phase. Breaking with climate-change orthodoxy, he said NAO cycles were probably responsible for some of the strong global warming seen in the past three decades. "But how much? The jury is still out," he told the conference.

    Latif claimed that NAO cycles also explained the recent recovery of the Sahel region of Africa from the droughts of the 1970s and 1980s. Few climate scientists go as far as Latif, an IPCC author. But more and more agree that the short-term prognosis for climate change is much less certain than once thought. James Murphy, head of climate prediction at the UK Met Office, agreed and linked the NAO to Indian monsoons, Atlantic hurricanes and sea ice in the Arctic. "The oceans are key to decadal natural variability," he said.

    View The Week That Was in which this editorial appeared.

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