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1998 - 2003© Copyright From The Wilderness Publications

 

Global Climate Change & Peak Oil, Part II

by

Dale Allen Pfeiffer

© Copyright 2004, From The Wilderness Publications, www.copvcia.com. All Rights Reserved. May be reprinted, distributed or posted on an Internet web site for non-profit purposes only.

[In part 1 of this article, we looked at the abrupt climate change scenario leaked from the Pentagon. We noted the authors' recommendation that the President should elevate abrupt climate change to a national security issue. And we observed that the Pentagon's next move was an effort to back off from the report's conclusions and ultimately bury the report. The Bush Administration has ignored the report entirely, aided by a powerful global-warming-denial lobby which promotes junk science produced by industry-sponsored research.

We then turned our attention to the amply published consensus of the world's scientific academies: that global climate change is taking place, and that it poses a threat to life on this planet and to human civilization in particular. Then we reviewed some of the hard evidence of industry-induced climate change as reported by the Intergovernmental Panel on Climate Change (IPCC) in their voluminous report, Climate Change 2001.1 Finally, we looked at some of the present costs of global climate change — in monetary terms, in environmental terms, and in terms of human life.

But the Pentagon report was more than a summary of the greenhouse effect, ozone depletion, and increases in global average temperatures. It was an unprecedented acknowledgement of a much more direct threat to our place in the world: abrupt climate change. That will be the focus of this essay. We will look at the oceans' role in the climate, the ocean conveyer system, the history of abrupt climate change episodes, and the effect of these episodes upon previous civilizations. –DAP]

Abrupt Climate Change

Large bodies of water — particularly the oceans and seas — have a moderating effect upon the weather. As anyone living on an island or near the seashore is well aware, the summers in such an area tend to be cooler than farther inland, and the winters tend to be warmer. As a resident of the state of Michigan, I am well aware that an Alberta clipper which will freeze North Dakota and Minnesota down to -20º F, will be warmed sufficiently upon crossing over Lake Michigan so that this same weather system will only drop Michigan 's temperature down to 0º F. This is because bodies of water tend to have less seasonal variance in their temperature than does stone or soil, and they interact with overriding air masses to transfer heat from one to the other.

This process is much more complex in the oceans than in the Great Lakes. Ocean currents channel warm water from the equator and cold water from the polar regions, with considerable effect upon local weather. Warm waters flowing up from the South Pacific bring heat to the Pacific Northwest and the Alaska Panhandle through the winter, leading directly to the temperate rainforests which dominate the ecology of this area.

Meteorologists have traditionally ignored the oceans' role in meteorological processes. And this would seem to make sense on the face of it: if you are studying the weather it is natural to focus on the atmosphere, not the oceans. But we are coming to understand that the oceans are an equal partner with the atmosphere in producing the weather, and the dominant partner with regard to long-range weather patterns.

The oceans play an important role in heat storage and transport, and are vital to the transportation of heat from the equator to the poles. They are essential to the hydrological cycle as well. Covering 70% of the Earth's surface, the oceans have 1,100 times the heat capacity of the atmosphere. They contain 97% of the free water on the planet—90,000 times as much water as the atmosphere. And they receive 78% of global precipitation.2 Unfortunately, oceanic processes have not been studied nearly so well as atmospheric processes; even environmentally crucial properties such as salinity and heat transference at depth have been relatively neglected until recently. As we'll see, abrupt climate change has everything to do with “thermohaline” dynamics in the ocean depths; that term is a compound of two ancient Greek roots meaning “heat” and “salt.”

But a series of global ship-based observations in the 1990s revealed that the ocean has warmed at depth since similar observations were last made in the 1950s. It turns out that this heat difference corresponds to about half of the greenhouse warming that had been projected by models but had been missing from actual measurements of the atmosphere. Meteorological models had not accounted for the capacity of the oceans to store large quantities of heat on short timescales.3 This capacity has been accounted for in more recent models, with the result that they are now much more accurate in their reproduction of long term heating and cooling trends.

The oceans could accurately be called the long-term memory of the Earth's climate system. The atmosphere is as fickle as it is dynamic. It lacks the permanence to produce decadal patterns. The oceans, however, host a variety of long-term cycles which can and do affect the weather.

Everyone has heard of El Niño and La Niña. Caused by the movement of warm water in the tropical Pacific — particularly off the coast of equatorial South America — these periodic three to five year disruptions are fully monitored by a system of buoys, so that they can now be predicted up to a year in advance. Yet these two phenomena represent only a small fraction of the influence which periodic ocean cycles exert upon the temperature and rainfall over North America. The variability of winter weather is highly correlated to long-term ocean cycles known as the Pacific Decadal Oscillation (PDO) and the North Atlantic Oscillation (NAO). The NAO, in particular, has a much stronger influence over the weather of the Eastern United States than does El Niño. Yet both of these long-term cycles are poorly monitored.

Likewise, it is the oceans which regulate the hydrological cycle. A diversion of only 1% of the rainfall currently falling on the Atlantic would double the discharge of the Mississippi River.4 At the other end of the spectrum, an increase of rainfall over the oceans, particularly over key areas such as the Labrador Sea and the North Atlantic, could disrupt the thermohaline circulation of the oceans, with a drastic and immediate effect upon the climate of North America and Europe.

The climate is a dynamic and sensitive energy exchange system held in a self-regulating equilibrium. The interactions of water and air have always been difficult to predict because they're governed by the branch of physics called fluid dynamics, whose recent mathematical formalism is called chaos theory. It's a description of the way that chaotic systems tend to magnify the effects of initially small changes. Depending on the stability of the system, proliferating changes can be compensated for by mechanisms that reestablish equilibrium, or they can overwhelm the system. In the latter case, the result is either a permanent disequilibrium, or a new equilibrium markedly different from the old. Any attempt at large-scale weather manipulation without a reliable model would be like driving down a mountain road with the windows blackened out using a roadmap whose reliability decreases progressively the farther you venture from your point of departure.

The problem with modeling weather patterns is that there are simply too many variables. Many of these variables, such as the NAO and the PDO, are not well understood and are poorly monitored. Even if computer power continues to increase by an order of magnitude every 6 years, it would take over 160 years before models would have sufficient capacity to simulate the smallest ocean mixing processes.

So predictive climate modeling is constrained by two intractable problems: the limitations of our computational equipment, and the inherent uncertainty of the data we put into it. In a different discipline, small initial errors might be averaged out or otherwise corrected-for. But in a domain like the weather – where the behavior of turbulent fluids is influenced by myriad variables all mutually interacting – the smallest numerical error can become enormous as it propagates through the model. If I want to know my county's surface temperature, pressure, rainfall and wind-speed a week in advance, I had better be rigorously correct about the numbers I put into my computer at the beginning.

This sensitivity afflicts long-term climate change modeling as well as short-term weather prediction, albeit in different ways. The chief difference is in the enormous disparity between the atmosphere and the oceans as reservoirs of thermal energy. Dr. Raymond Schmitt of the Woods Hole Oceanographic Institute describes climate modeling:

An abundance of evidence indicates that the key to long-term prediction is in the workings of the ocean, which has 99.9% of the heat capacity of Earth's fluids. It is the heart of the climate ‘beast,' the atmosphere its rapidly waving tail, with only 0.1% of the heat capacity.6

Thermohaline Circulation — the Oceans' Heat Conveyer

Perhaps the most important role for the oceans in helping to regulate the climate is the absorption of heat from equatorial regions and the transportation of that heat into northern regions. This process helps to distribute heat more evenly around the globe, moderating the heat of equatorial regions as well as the cold of higher latitudes — particularly in the North Atlantic. These currents warm North Atlantic regions by an average of 5º Celsius, significantly tempering the winter season in North America and Europe.7

Taken from Abrupt Climate Change; should we be worried?

Woods Hole Oceanographic Institute, 1/27/2003

This global current could be said to originate in the seas which ring the North Atlantic —the Labrador, Irminger and Greenland Seas, where the oceans release large amounts of heat into the cold atmosphere. Evaporation, which has been occurring throughout the North Atlantic, is here increased to the point that these northern waters constitute the saltiest waters in the oceans. The concentration of salts results in a denser solution, as does the loss of heat. And this denser water sinks to the ocean abyss, where it begins a slow migration back down the Atlantic and eastward into the Indian and Pacific Oceans. There it wells up, having lost much of its salinity. Displaced by colder waters moving under it and heated by contact with warmer flows from above, the formerly deep water rises toward the surface and picks up additional heat along the return journey into the Atlantic.

Unfortunately, the ocean conveyer does have an Achilles heel. And this Achilles heel lies in the Northern Atlantic region where the deep limb of the ocean conveyer originates, drawing warm equatorial waters to replace it. If the cold, salty, dense waters of the North Atlantic somehow failed to sink, then the global circulation could slacken and halt. Currents would weaken and/or be redirected, with potentially catastrophic consequences for the whole biosphere.

Were this to happen, the North Atlantic region would cool by an average of 5º Celsius. This would mean that winters in Eastern North America would be twice as cold as the coldest winter on record in the past century, and Europe would be even colder.8 The summer growing season in these areas would be shortened, and summer crops might fail altogether. Previous conveyer shutdowns have been linked to widespread droughts throughout the world, and the disruption of the Asian monsoons.9

The resultant mini-ice age in North America and Northern Europe — and droughts elsewhere in the world — could continue for decades or even centuries, until conditions change sufficiently for thermohaline circulation to resume. Further, this localized mini-ice age might occur even as the Earth, on average, continues to warm.10 As a result, once thermohaline circulation resumed, the Northern Atlantic region could be thrown from one extreme to the other — from an ice age to a hot house.

All that is necessary for this scenario to occur is an influx of fresh water into the surface of the North Atlantic . This buoyant, fresh water would virtually seal off and insulate the denser, saltier waters, preventing them from venting heat and moisture into the atmosphere. The fresh waters would also dilute the salinity of the North Atlantic, further reducing the density of these waters. The force driving the deep limb of the ocean conveyer would quickly weaken and halt. And the cessation of thermohaline circulation would quickly impact the world's climates.

This scenario could take place in a decade or less from the time that fresh water influx in the Northern Atlantic reaches a critical threshold. Unfortunately, though scientists are certain that such a threshold exists, not enough research has been done thus far to determine where this threshold is. Oceanographers have complained that we do not have a system in place to monitor slowly developing ocean circulation changes. While we have thousands of meteorological stations recording temperature on land and in the atmosphere, we have only three sites with anything like a continuous deep record of the North Atlantic. And these sites only make observations once per month.11 Satellites can monitor ocean circulation globally, but only at the surface. For measurements at depth, we need a network of buoys and current-monitoring vessels.

Oceanographers reporting in Nature, in 2002, concluded that a dramatic influx of fresh water into the North Atlantic has taken place continuously within the past forty years, and has accelerated within the last decade.12 This is the largest and most dramatic change in the oceans in the era of modern instruments. So far, the influx has been dispersed throughout the water column. But it is noticeably diluting salinity.13 And, at some point, the continuing influx may begin to pile up at the surface of the North Atlantic. An earlier report in Nature observed that the flow of cold, dense water from the Greenland and Norwegian Seas has slowed by 20% since 1950.14 This indicates that a slowdown of the ocean conveyer may already be occurring. An observation system must be put into place before we can better assess the impact of these developments on thermohaline circulation, and the rate at which the ocean conveyer may be disrupted.

Taken from Abrupt Climate Change; should we be worried?
Woods Hole Oceanographic Institute, 1/27/2003

A History of Abrupt Climate Change

Until very recently, scientists believed that major climate change could only occur gradually, over long periods of time. The study of ice cores drilled in Greenland, Antarctica and in alpine glaciers around the world has changed that thinking. These ice cores hold a wealth of information. Aside from a record of annual snowfall, the ice cores hold spores and pollens, and volcanic ash. Also found in tiny inclusions in the glacial ice are trapped remnants of the atmosphere from thousands of years past. These gas inclusions can be analyzed to give an accurate measure of the chemical makeup of the Earth's atmosphere over the course of centuries. It is the study of carbon dioxide levels, as recorded in the air bubbles of these ice cores, which has established the ineluctable proof of industry-induced global climate change.

Thanks to these ice cores, we now have a detailed history of the Earth's climate stretching back nearly twenty thousand years. Reading the ice cores is somewhat similar to reading the growth rings on a tree, but complicated because the yearly layers of ice have been contorted and folded by pressure and ice flow. However, with the help of some applied physics and structural geology, the layers can be unfolded and the record can be read accurately. This endeavor has already yielded remarkable scientific results, including the discovery that abrupt climate change has already occurred in previous eras. In the last fifteen thousand years, there have been several periods of abrupt climate change of varying severity and duration. Let's review four of these abrupt climate change episodes.

Taken from The Two-Mile Time Machine, Richard B. Alley.
Princeton University Press, 2000 (reprint edition 2002)

The Younger Dryas— Named for a small subarctic flowering plant which extended its range far southward into North America and Eurasia during this period. The Younger Dryas began about 12,700 years ago when average temperatures in the North Atlantic region plummeted by about 5º C. This abrupt change took place within a decade, and is believed to have been caused by a shutdown of the ocean conveyer due to a sudden influx of fresh water from the deglaciation of North America. The climate remained colder by about 5º C for the next 1,300 years, before another abrupt change caused temperatures to rise by about 7º C in less than a decade.15

Study of the Younger Dryas in particular has led scientists to conclude that there are preferred states of balance in the atmosphere. Should one state be tipped sufficiently out of balance, the atmosphere will cross some critical but unknown threshold and will then transition quickly to another state of balance. This thinking has revolutionized our view of climate change, and holds important implications for industry-induced climate change.

The 8,200-Year Event— This event was not as severe as the Younger Dryas, and lasted only a century. Temperatures in the North Atlantic region dropped by an average of 3º C. This episode seems to be associated with widespread dry conditions. There are two possible explanations for the 8,200-Year Event. The most widely accepted explanation is a disturbance in thermohaline circulation due to freshwater input associated with the retreat of the Laurentide ice sheet. Other studies have indicated that a fresh water influx from large proglacial lakes could have produced the 8,200-Year Event, and would even account for a brief warming episode within the event.16

The Medieval Warming Period— This is considered to be a period of abrupt warming which began approximately 1,000 years ago, and then ended abruptly 700 years ago with the beginning of the Little Ice Age. This event was very mild compared to earlier events, and there is much contradictory evidence from this period. Evidence appears to support warming at the beginning of the 20th century in Scandinavia, Greenland, China , the Sierra Nevadas, the Canadian Rockies and Tasmania . However, evidence from the Eastern United States, Mediterranean Europe, and South America show no change in climate. Ice core data from Greenland supports the theory of a warming trend, but needs to be correlated with ice core data from other areas of the globe. The Intergovernmental Panel on Climate Change (IPCC) states that temperatures from the 11th century to the 14th century were only about 0.2º C warmer than temperatures from the 15th to the 19th centuries, and were below average temperatures in the 20th century.17 Though the specific changes in regional temperatures remain difficult to specify, the data clearly indicate that during the past millennium the Earth's climate has varied on a decadal scale.18

The Little Ice Age— This event brought an abrupt end to the Medieval Warming Period. It extended from the 1300s to the mid 1800s. The Little Ice Age was once thought to be a global phenomenon, but now that assumption is less certain. Evidence for the Little Ice Age appears to be stronger than the evidence for the Medieval Warming Period. The IPCC defines this as a period of modest cooling of the Northern Hemisphere by less than 1º C.19 It was certainly a period of bitterly cold winters in many parts of the world, and is most thoroughly attested in Europe and North America. It is documented that glaciers in the Swiss Alps advanced during this period — even threatening villages. Rivers which are not known to freeze over in recent history did freeze over in this period—the Thames , the Delaware, the Ohio. In the winter of 1780, the New York Harbor froze so thick that people could walk from Manhattan to Staten Island. And the sea ice surrounding Greenland closed that island nation's harbors to shipping.20

Scientists believe there were two causes for this cold period. In the middle of the Little Ice Age, from 1645-1715, there was a marked decrease in sun spot activity. This period is known as the Maunder Minimum. The exact link between sunspot activity and climate is not known, but scientists find it highly suggestive that the Maunder Minimum coincides with the coldest years of the Little Ice Age. The other causal factor was increased volcanism throughout the Little Ice Age. Volcanic ash dispersed throughout the atmosphere blocked incoming solar radiation. Sulfuric acid particles derived from sulfuric oxide gases discharged by volcanoes served to reflect more of the sun's rays, further reducing the amount of solar energy reaching the Earth's surface.21

Abrupt Climate Change & Civilization

It seems that the climate conditions on this planet naturally undergo sudden shifts several times per thousand-year period. Clearly, anthropogenic changes like those responsible for global warming are likely to bring the next major shift closer. How will abrupt climate change affect our civilization? How has abrupt climate change affected past civilizations? The Medieval Warming Period and the Little Ice Age took place in relatively recent times. During the Medieval Warming Period, the Vikings colonized Greenland and other areas of the far north, venturing so far as the Americas, where they came into contact with the Inuit peoples. When the climate reversed itself, plunging into the Little Ice Age, the Vikings abandoned their colonies in Greenland, and the population of Iceland fell by half. Famines were frequent and deaths from disease increased. The famine of 1315 claimed 1.5 million lives. The forests of Northern Europe were denuded as people chopped wood for heating. And the severe cold played a major role in spurring the European expansion into the New World and elsewhere.22

It is now thought that the Younger Dryas led the Natufian communities of southwest Asia to abandon their nomadic hunting and gathering and develop labor intensive agriculture. The cooling of the Younger Dryas caused harvests of wild resources to dwindle below the level necessary for subsistence. The Natufians abandoned their nomadic culture, and established permanent settlements in areas where they could cultivate previously wild cereals. The development of agriculture entails the permanently localized settlement that we call civilization (literally, the “culture of the city”). These early farming communities grew in population and socioeconomic complexity until they were hit by another abrupt climate shock around 6400 B.C. This was the last major climate event related to the melting of the continental ice sheets.23

In the Middle East, a 200-year drought is blamed for the abandonment of early agricultural settlements in the Levant and Mesopotamia. The return of a wetter climate in Mesopotamia led to the occupation and development of the Tigris-Euphrates river plain. The collapse of the Late Uruk urban society of southern Mesopotamia may be related to a severe drought which lasted less than 200 years. Such a drought is hinted at in the paleoclimatic record.24

The Akkadian Empire of Mesopotamia, the Old Kingdom civilization of Egypt, the Harappan 3B civilization of the Indus valley and the Early Bronze Age civilizations of Palestine, Greece and Crete were all abruptly terminated by 2200 B.C. due to catastrophic drought and cooling. Paleoclimatic evidence shows that rainfall was reduced by 30%, leading to failing agricultural production from the Aegean to the Indus.25

Abrupt climate change also correlates to societal collapses in the Americas. Prolonged drought and severe flooding coincide with the collapse of the Moche civilization in northern coastal Peru. Similarly, the collapse 400 years later of the Tiwanaku civilization of the Central Andes correlates with a period of prolonged drought. The collapse of the Classic Mayans in the 9 th century A.D. coincides with the most severe and lengthy drought of that millennium. And in North America, three decades of severe drought and colder temperatures spelled the downfall of the Anasazi culture in the 13th century.26

Modern civilization, with its technological ingenuity, may be more capable of withstanding an abrupt climate change event than were these ancient civilizations. However, if abrupt climate change happens at a time when modern civilization is already suffering from resource depletion — particularly the depletion of its hydrocarbon energy base — the effect of such a double impact upon our civilization could be very grave indeed. In the past, when abrupt climate change rendered one area uninhabitable, people could migrate to another area. In today's world, that is no longer possible.

Weakening of the North Atlantic Current

As this article was being written, NASA issued a bulletin reporting that satellite records reveal that North Atlantic circulation system weakened considerably in the 1990s from what it was in the 1970s and 1980s. Considering how essential this area is to the ocean conveyer — and consequently to the climate — this evidence of weakening is extremely important. This current, known as the sub polar gyre, is tied in with the NAO as well as the ocean conveyer.27

The pathways associated with the transformation of warm subtropical waters into colder subpolar and polar waters in the northern North Atlantic. Along the subpolar gyre pathway the red to yellow transition indicates the cooling to Labrador Sea Water, which flows back to the subtropical gyre in the west as an intermediate depth current (yellow). In the Norwegian and Greenland Seas the red to blue/purple transitions indicate the transformation to a variety of colder waters that spill southwards across the shallow ridge system connecting northern Europe, Iceland, Green-land, and northern North America. These overflows form up into a deep current also flowing back to the subtropics (purple), but beneath the Labrador Sea Water. The green pathway also indicates cold waters—but so influenced by continental runnoff as to remain light and near the sea surface on the continental shelf.

—Map and caption taken from NASA press release

Satellites record weakening North Atlantic Current
http://www.gsfc.nasa.gov/topstory/2004/0415gyre.html

Researchers believe the cause of this slowing is a reduction in the temperature differential between water from the Labrador Sea and waters from the Atlantic. Labrador Sea waters in the core of the gyre appear to have warmed during the 1990s, reducing the contrast with waters from warmer southern latitudes.28 This temperature differential is a major part of the driving force for ocean circulation.

Researchers point out that this is a signal of large climate variability in higher latitudes. Sirpa Hakkinen, lead author of the report and a researcher at NASA's Goddard Space Flight Center, has said, “If the trend continues, it could indicate reorganization of the ocean climate system, perhaps with changes in the whole climate system, but we need another good 5 to 10 years to say something like that is happening.”29

To be Continued…

The final installment of this series will look at the possibility of runaway global warming, and the implications of Peak Oil and the North American Natural Gas Cliff.

-------------------------------

1) Climate Change 2001, The Intergovernmental Panel on Climate Change. Cambridge University Press, 2001. http://www.grida.no/climate/ipcc_tar/

2) The Ocean's Role in Climate, Schmitt, W. Raymond. Woods Hole Oceanographic Institute. Testimony to the Senate Committee on Commerce, Science, and Transportation, 7/18/2000. http://www.whoi.edu/institutes/occi/currenttopics/abruptclimate_schmitt_testim

3) Ibid.

4) Ibid.

5) Chaos: making a new science, Gleick, James. Viking Press, 1987.

6) Op. Cit. See note 2.

7) Abrupt Climate Change; should we be worried? Woods Hole Oceanographic Institution. Prepared for a panel on abrupt climate change at the World Economic Forum. 1/27/2003 . http://www.whoi.edu/institutes/occi/hottopics_climatechange.html

8) Ibid.

9) Ibid.

10) Ibid.

11) Op. Cit. See note 2.

12) Rapid freshening of the deep North Atlantic Ocean over the past four decades, Dickson, Bob, et al. Nature, vol. 416; April 25th, 2002.

13) Ibid.

14) Decreasing overflow from the Nordic Seas into the Atlantic Ocean through the Faroe Bank Channel since 1950, Hansen, B, et al. Nature, vol. 411; June 21st, 2001.

15) The Two-Mile Time Machine, Richard B. Alley. Princeton University Press, 2000 (reprint edition 2002).

16) Structure of the 8200-year cold event revealed by a speleothem trace element record, Baldini, J.U.L., McDermott, F., Fairchild, I.J. Science 296: 2203-2206; 2002.

17) Climate Change 2001. The Intergovernmental Panel on Climate Change. Cambridge University Press, 2001. http://www.grida.no/climate/ipcc_tar/

18) Was there a Medieval Warm Period? Hughes, M.K., & Diaz, H.F. Climatic Change, Vol. 26, p. 109-142, March 1994.

19) Op. Cit. See note 17.

20) The Little Ice Age: How Climate made History 1300-1850, Fagan, Brian. Basic Books, 2000.

21) Volcanic dust, sunspots, and temperature trends, Schneider, S. H., and C. Mass. Science, 190:741-746; 1975.

22) Op. Cit. See note 20.

23) What Drives Societal Collapse? Weiss, Harvey & Bradley, Raymond S. Science, 291: 609-610; 2001.

24) Ibid.

25) Ibid.

26) Ibid.

27) Satellites Record Weakening North Atlantic Current. NASA, Goddard Space Flight Center press release. April 15th, 2004. http://www.gsfc.nasa.gov/topstory/2004/0415gyre.html

28) Decline of Subpolar North Atlantic Circulation during the 1990s, Hakkinan, S. & Rhines, P. Science 2004 0: 10949171-0. http://www.sciencemag.org/cgi/content/abstract/1094917

29) Op. Cit. See note 27.

 

 

 

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