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Global Warming Science, Press, And Storms: Nils Ekholm
Global Warming Science, Press, And Storms: Nils Ekholm
Scientists are expected to live and die on the quality and integrity of their data analysis—but usually that is a metaphor. What prospers or fails is merely their reputation, or at most their career. For Nils Ekholm, meteorologist and physicist, the stake turned out to be his life. When the test came, he was called upon to decide between what the data told him was true, and between what he--and all around him--would have preferred to be true. He had to make that choice in the eye of the press—the “media” of his day. And had he chosen otherwise, there is every reason to think he would have died cold and exhausted in a remote corner of the Arctic.Ekholm was born into a pharmacist’s family on October 9, 1848, in the rural Swedish town of Smedjebacken—“Smith’s Hill” or “Smithy Hill.” The name carries a suggestion of the increasing--and often rural-based--industrialization that would gradually bring Sweden out of the national poverty that had been her lot for a century or more. He went on to attend high school in the mill town of Norrköping, graduating in 1868, and entered the ancient University of Uppsala in the fall of the following year.
Places from Ekholm's early lifeClick thumbnail to view full-size
Seven years later, he left, Master of Science degree in hand, to take a position as an amanuens (“assistant”) with the Swedish Meteorological Service. Energetic and ambitious, he must have worked hard and learned much—but apparently received little tangible reward. In 1881, he left the Service to supervise the meteorological research program with the Swedish component of the International Arctic Research Program, which carried out scientific studies in Spitsbergen in 1882-3. His ambition was rewarded; upon the illness of Commander Malmberg, Ekholm was chosen to replace him as leader of the Expedition. It must have been a heady experience for a gifted man, now well into his thirties, who had been chafing at his long tenure as “assistant.”
He seems to have acquitted himself well. Certainly he made some valuable contacts, and must have learned much from the experience. One particularly fateful contact would be Salomon August Andrée, another amanuens, who had been employed at the Royal Institute of Technology in Stockholm. A mechanical engineer by training, Andrée was responsible for electrical measurements of the atmosphere, a subject in which Ekholm would later demonstrate considerable interest.
Despite Ekholm’s leadership experience, upon his return from the expedition he once again took up his old post. But in 1885 he published his first scientific paper, titled Measurements of the heights and movements of clouds. Soon he was again studying at Uppsala, receiving the Licentiate degree in 1887, becoming Docent in 1888, and achieving the PhD in 1889. He had continued to publish scientific papers, and in 1890 his productivity was rewarded with an appointment to the Central Bureau of Meteorology in Stockholm. He was further recognized in 1892 with an honorary membership in the Royal Meteorological Society of England.
Yet Ekholm was still not part of the established scientific elite. Swedish science’s “old guard” was not to be found in the capital, but in professorial chairs at the long-established universities of Uppsala (founded in 1477) and Lund (1666). Ekholm responded to this professional challenge by forging ties with other scientists working outside the traditional circle.
At the recently founded Stockholm Högskola (university college), for example, was Svante Arrhenius, who had already transformed chemistry (though not all chemists were yet willing to admit it.) The Norwegian mathematician Vilhelm Bjerknes, who contributed so much to the foundations of mathematical meteorology, would arrive there in 1895. With Ekholm, Arrhenius and Bjerknes would be the leading lights of the Stockholm Physical Society. There, they and their colleagues would make shrewd use of the press to generate public awareness and support for their work.Also in Stockholm was the Royal Academy of Sciences. Founded in 1739 as a more practically-oriented counterpart to the older Royal Society of Sciences in Uppsala, its relatively greater emphasis on the useful application of scientific knowledge was symbolized by its choice to publish its proceedings in Swedish, rather than the traditional Latin. Arrhenius was a member there, too; so was geologist and Polar explorer Adolf Nordenskjold, the leader of the first expedition to navigate the Northeast passage.
The Academy would be central to a new development—new set of scientific and cultural prizes, endowed by the inventor of dynamite, Alfred Nobel. These new “Nobel Prizes” would be a godsend for the Stockholm scientific circle. An annual event honoring scientific innovation in the service of humanity by awarding large cash prizes with the utmost in pomp and solemnity, the Prizes fit naturally with their agenda and style. Nor was the glorification of Scandinavian, and specifically Swedish, science uncongenial to the Stockholm coterie. And of course, the Academy was in charge of the selection process.
Through the 90s Ekholm continued to publish—an English article on clouds, an article on the Coriolis force, and a number of articles co-authored with Arrhenius. These papers exemplify another characteristic of the Stockholm circle: a liking for what has been called “cosmical physics.” Whereas the traditionalists emphasized precise quantification and measurement for its own sake, the “cosmical” style looked to answer larger questions and to connect larger phenomena. Ekholm and Arrhenius, for instance, examined connections between the Moon and the Earth’s “electrical state,” the auroras, and thunderstorms—and even human biology. (It’s speculative, but easy to imagine, that conversations with his old Spitzbergen colleague S.A. Andrée—responsible as the latter had been for measurements of “air electricity”--may have played a role in Ekholm’s contributions to these papers.)
Amidst all this scientific productivity, Ekholm reached a personal milestone in 1895, marrying Agnes Elpidina Boden. One sees in these facts the picture of an increasingly successful middle-aged man—someone in control of his life, someone doing worthwhile and rewarding work, and now preparing to begin a new family life. Of course, life tends not to move in straight lines, and surprises were in store for Nils Ekholm.His old colleague Andrée had been bitten hard by the aviation bug back in 1892. Though Samuel Langley in the US was achieving his greatest successes flying steam- and gas-powered models in 1896, actual human flight at the time meant using balloons. Beginning in 1893 with the purchase of a hydrogen balloon which he named Svea, Andrée had experimented with methods of controlling direction in balloon flight, inventing a system combining drag ropes and sails. He believed that he had achieved his goal of directed flight; modern experimenters believe that he allowed himself to be deluded by his own excessive optimism. But he made nine long flights in the Svea--crossing the Baltic Sea to Finland on one--and had used the drag-rope-and-sail system on several of them.
But his goals were much more ambitious than mere trial flights. Nordenskjold had been ennobled for his exploration of the Arctic and was rich and famous--a very important person indeed. Andrée, by contrast, was only moderately successful, with his steady but unexciting position at the Patent Office, and a term served on the Stockholm city council. But what if he could use a balloon to visit the North Pole--the Holy Grail of Arctic exploration? That would out-Nordenskjold Nordenskjold himself. There would few limits for the man who could achieve such a thing.
So Andrée laid his plans. A bigger balloon would be needed, and scientific observations were de rigueur; it would not be an inexpensive venture. But Andrée’s flights in Svea had achieved considerable public attention, after all, and he was a published scientist with Arctic experience. He was also a strong public speaker with considerable skill in politics—including appeals to the public. His presentations quickly found (or created) public enthusiasm, and better yet attracted financial backing from the Royal Swedish Academy, King Oscar II, and Alfred Nobel.
Andrée commissioned a new three-layer, 67-foot diameter balloon—to be dubbed the Örnen (Eagle.) It was meant to carry a three-man crew. Plans were laid; the expedition would take to the air from a base on Danskøya, an island of the Svalbard Archipelago, where a special plant would synthesize the necessary hydrogen. Aboard the balloon would be Andrée himself, Nils Strindberg--a young photographer and physics student already doing advanced research--and Nils Ekholm.
The departure of the expedition was a riot of enthusiasm. But once the Svalbard base was established and the balloon inflated, luck seemingly turned against Andrée and his crew. Day after day, the wind blew unrelentingly from the North. It was quite contrary to Andrée’s prediction, and far beyond the range of the 27-degree deflection from wind direction of which he believed the Örnen capable. Back home, the papers faithfully reported this embarrassing delay. Andrée could do little except chafe.
But there was worse. Ekholm was responsible for monitoring the balloon’s lift capacity. According to the plan, capacity was to be sustained for 30 days in order to ensure a safe transit of the Arctic. But though every attempt had been made to seal the balloon’s envelope as tightly as technology allowed, there were an estimated eight million needle holes in the fabric underneath the sealant—and hydrogen is notoriously difficult to contain. Measurements showed a daily loss of 68 kilograms of lift; Ekholm estimated this rate would allow a mere 17 days airborne. Puzzlingly, at times the decline would mysteriously reverse itself. Could the measurements contain some unknown source of error?
In the end, the wind never turned. There was no alternative but to pack up and return home. But Ekholm told Andrée that the issue of the envelope must be solved, or he would not participate in future attempts. This could not have been an easy decision. Ekholm likely knew very well that he would be criticized for withdrawing; already a source of national pride, the expedition was expected to put Sweden at the forefront of Arctic exploration, vaulting her past her sometime possession, Norway. Ekholm might well be called a shirker. Nor would his conversation with Andrée be easy—Andrée in his disappointment resisted acknowledgement of Ekholm’s concerns more or less completely. Yet the message of the lift data was clear.
It was only on the return voyage itself that Ekholm would learn from the chief engineer of the hydrogen plant how the anomalies in his lift measurements had come about. Andrée had ordered that Örnen be secretly topped up with hydrogen! It must have been a shock to Ekholm: in essence, Andrée knew, or should have known, that Ekholm was right.
Did Andrée somehow deceive himself with what would later be called “doublethink,” fearing the embarrassing revelation of the expensive balloon’s design deficiencies? Was he afraid that there would not be a second chance, if a new balloon had to be commissioned? In any case, he would not reconsider. The Örnen would fly the following season, with or without Nils Ekholm.
As expected, Ekholm’s decision was criticized by some in the press. How could Ekholm fail to take his part in carrying forward Sweden’s national destiny? And it is always too easy to confuse prudence with cowardice. But though the non-events of the first attempt did dampen enthusiasm somewhat, Andrée had no great trouble finding a replacement. Now it would be Knut Frænkel—another engineer and Royal Institute of Technology alumnus—who would sail off to aeronautical and meteorological glory.
At first the 1897 expedition seemed to go better: the base was reached with relatively little trouble on May 30, and June 22 saw the beginning of the inflation process, with workmen painstakingly sealing and testing the expanded envelope. And on July 11, a brisk southerly wind sprang up. Final preparations were made, and at 2:30 PM the balloon was launched, quickly climbing to about 300 feet. But luck turned at once: somehow the drag ropes had become disconnected from the balloon, remaining on the shore. And as quickly as Örnen had climbed, she was forced down again by air currents, till the basket touched the frigid waters. The sails were trimmed, and precious ballast dropped; soon the balloon rose to an estimated 1,000 feet and disappeared into the Arctic sky.
The first message from the expedition was received on July 15th, when one of the carrier pigeons carried aboard Örnen was retrieved by a Norwegian sealer. It read: ‘From Andrée’s Polar Expedition to Aftonbladet, Stockholm/13th July 12.30 midday, Lat. 82 2′ Long. 15 5′ E. good speed to E. 10 south. All well on board. This is the third pigeon post. Andrée.’ Sadly, nothing more would be heard until May, 1899, by which time hope for the survival of the Expedition members had waned considerably.
Ekholm maintained his interest in ballooning, becoming the founding chairman of the Swedish Aeronautical Society in 1900. How better could meteorological data from high altitudes be gathered? In addition to his work at the Meteorological Bureau, he continued to publish scientific papers. Of particular interest is his 1901 paper “On the variations of the climate of the geological and historical past and their causes,” published in January of 1901 in the Quarterly Journal of the Royal Meteorological Society.
The paper is a clear example of the “cosmical” mode of Swedish physics championed by Arrhenius. Visionary and at times highly speculative, it considers many questions--from the age of the Earth as estimated by various means, to the influence of orbital forcings upon the climate, to the characterization of the historical climate regime often known today as the “Medieval Warm Period.” It seeks to synopsize and synthesize the best knowledge then available on the topic of CO2 and climate change. As such, it is a remarkable mix of now “dated” nineteenth-century science and ideas that sound quite modern indeed.
In some passages, one can see both qualities at once. For example, Ekholm considers, but finally disposes of, two of the terms in Fourier’s old heat budget: the contributions of heat from the Earth’s interior and from the “temperature of space.” Measurements showed both the conductivity of rock and the temperature of space to be too low to allow either a significant contribution to Earth’s heat budget. Earth’s surface energy input is nearly all due to solar radiation.
But Ekholm could not have envisaged the revolution in physics soon to be wrought by the discovery of radioactivity—although it was already quietly brewing in a few laboratories. Nor had the idea of plate tectonics yet been proposed. Both developments affect Ekholm’s discussion considerably: without radioactive decay, it is hard for him to reconcile the Earth’s interior temperature with geological estimates that the planet could be as old as a billion years. (As we now know, this “daring” estimate is still much too low.) And without plate tectonics, the consequences of a contracting planet—for contraction would be inevitable, without radioactivity—lead Ekholm to geological conclusions that are spectacularly incorrect, as in his prediction that “no large and mountainous polar continent has probably ever existed.” (The existence of extensive Antarctic mountains would be a revelation of the following decade, with the explorations of Shackleton, Amundson, Scott and others—though Mounts Erebus and Terror had already been discovered in 1841.)
On the other hand, there are passages that strike a modern chord indeed. For instance, it is still a common popularized formulation that greenhouse gases “trap” infrared radiation in the atmosphere or at least “slow its escape.” This formulation, though arguably correct in a summary, somewhat metaphorical way, is implicitly rooted in an idea of the atmosphere as a single layer—an idea inadequate to accurately model the radiative physics involved. But Ekholm’s paper contains this striking exposition of the greenhouse effect:
. . . radiation from the earth into space does not go directly from the ground, but on the average from a layer of the atmosphere having a considerable height above sea-level. . . The greater is the absorbing power of the air for heat rays emitted from the ground, the higher will that layer be. But the higher the layer, the lower is its temperature relatively to the ground; and as the radiation from the layer into space is the less the lower its temperature is, it follows that the ground will be hotter the higher the radiating layer is.
This is a key concept, in effect answering Knut Ångström's 1901 contention that CO2 absorption was "saturated"--that is, that additional CO2 would not increase infrared absorption because absorption has already reached its maximum. Unfortunately, the significance of Ekholm's formulation was largely overlooked at the time, and development of CO2 theory was sidetracked in a blind alley for several decades. Thorough mathematical treatment of this aspect would have to await Gilbert Plass and the advent of electronic computing in the late 1950’s.
Ekholm is also forward-looking in his identification and discussion several key questions regarding what are now termed “feedbacks”: the effects of water vapor and clouds, geological and biological carbon sequestration, and oceanic uptake of CO2. It is worth noting that, like his friend Arrhenius, and like Guy Callendar later, Ekholm sees a warmer climate as a good thing: CO2 has a “protective influence,” and warm periods are “genial;” warming is referred to as “amelioration.”
Ekholm does not fail to consider astronomical influences as an alternate explanation for climate change. Though Milan Milankovitch would not perform his definitive calculations of the Earth’s orbital cycles for three decades yet, the Serb was not the first to consider the effects of cyclic orbital changes. Ekholm cites work on the “obliquity cycle” performed by J. Croll and by J.N. Stockwell, and allows that, although CO2 is the “principal cause” of the ending of the Ice Age, obliquity changes may have provided a “material” contribution.
Ekholm’s prophetic conclusion to the paper is much-quoted:. . . the present burning of pit-coal is so great that in one year it gives back to the atmosphere about one one-thousandth of its present store of carbonic acid. If this continues for some thousand years it will undoubtedly cause a very obvious rise of the mean temperature of the earth. Also Man will no doubt be able to increase the supply of carbonic acid also by digging of deep fountains pouring out carbonic acid. Further, it might perhaps be possible for Man to diminish or regulate the consumption of carbonic acid by protecting the weathering layers of silicates from the influence of the air and by ruling the growth of plants according to his wants and purposes. Thus it seems possible that Man will be able efficaciously to regulate the future climate of the earth and consequently prevent the arrival of a new Ice Age. By such means also the deterioration of the climate of the northern and Arctic regions, depending on the decrease of the obliquity of the ecliptic, may be counteracted. It is too early to judge of how far Man might be capable of thus regulating the future climate. But already the view of such a possibility seems to me so grand that I cannot help thinking that it will afford to Mankind hitherto unforeseen means of evolution.
“Cosmical,” indeed! But the closing years of Ekholm’s career would be dominated by matters quite practical. In 1902, Ekholm was considered as a candidate for Director of the Bureau of Meteorology, and seems to have been seen as the candidate of those focused on a dynamic and practically-oriented meteorology—a perception he may well have been at some pains to foster. For example, he was described by one daily paper as “a man with initiative and energy . . . the most agile and active of the Bureau’s staff.” Despite such support, the job went instead to Hugo Hamberg, whose professional focus was the study of the climatic effects of forests and peat bogs.
In December, however, southern Sweden was struck by an intense storm; widespread damage was incurred and people died. Within two weeks, Ekholm kicked off a campaign to institute a Swedish storm warning system with a public meeting at the Royal Academy of Sciences. In attendance was the new Director, as well as high-ranking maritime, naval and governmental officials. This was followed up a month later with an address to the Physics society, in which Ekholm described efforts to use modern technologies, such as balloons equipped with automated meteorological instruments and telegraphy, in the service of better storm prediction. Ekholm continued his campaign in the press. Shrewdly, he also built political coalitions with both scientific allies--such as Vilhelm Bjerknes, who was already promising to transform meteorology--and stakeholders such as Swedish merchants, fishermen, and seafarers.
The Bureau had actually had the task of issuing storm warnings since 1872; the Swedish parliament had followed other European nations in mandating this function when it first allotted funds to create the Bureau. However, no system had actually been implemented. Ekholm used his by now well-honed skills of “science by press release” and political coalition-building to remedy this deficiency--and to great effect. In September of 1905, a newly-instituted system began distributing warnings to 27 stations along the southern and western coasts of Sweden. Perhaps not so coincidentally, Ekholm was elected to the Royal Academy of Science that same year.
But Ekholm did not simply declare victory at this point. Rather, he worked to expand and improve the system, both technically and in terms of what we would now call “user-friendliness.” Conspicuously, he obtained grants in 1906 and 1907 from the Merchant and Seafaring Foundation to improve forecasting, noting that Bureau “resources were being used for other tasks.” It is easy to read into this wording, with its tacit criticism of official Bureau priority-setting, an ongoing bureaucratic and political conflict.
These efforts, too, were ultimately successful; the warning system was seen by both users and the press as a success. Within a few years, seafarers on other parts of the Swedish coast were asking for an extension of the service to their waters and in 1913 parliament acceded to this request with an allotment of funds. Actual implementation would be delayed by the outbreak of World War I in 1914, which disrupted the international sharing of weather information, but eventual success was secure.
Once again Ekholm reaped a professional reward with his appointment as Director of the Bureau. The road had been long, rocky and at times circuitous, but the long-time amanuens had arrived. But there was an ironic coda. Back in the 1890s Ekholm had been associated with Arrhenius’s “cosmical” investigations of the effects of astronomical--and particularly Lunar--influences upon weather. Such considerations, however, had no place in the predictive methods of the Bureau.
But in 1913, the very year of Ekholm’s triumph, Gustaf Strömberg, assistant astronomer at the Stockholm astronomical observatory, put forward a “cosmical” challenge to the Bureau, using much the same press techniques so familiar to Ekholm. Just as Andrée had tried to out-Nordenskjold Nordenskjold, now Strömberg was trying to out-Ekholm Ekholm. Strömberg negotiated leave from his position at the Stockholm observatory, raised money with which to pay computing assistants and equipment and attracted considerable favorable public notice.
For example, the same paper which had praised Ekholm back in 1902 now wrote “[How] easy it is for the most uneducated to confirm the amazing correlation between the curve he has calculated for this year and the observed temperature. . . Mr. Strömberg’s reputation as an authority on the weather has got further support. . .” Accordingly, the paper bought his predictions for November and December 1902, evaluating them in a series of articles. As has often happened when amateurs find amazing correlations between various phenomena and weather, however, the apparent link broke down with time. Strömberg’s enterprise failed, and he returned to astronomy, eventually working at the Mount Wilson Observatory in the United States.
Ekholm continued as Director until his retirement in 1918, and lived until 1923, dying at 74 on April 5 of that year. He certainly could have looked back, in the years of his retirement, upon an active, eventful, and useful career. One wonders how often he thought of his lost colleagues of the Örnen expedition; the mystery of their fate had abided all those years, despite a great deal of searching and a corresponding number of psychic “tips.”
It would only be in 1930--at the beginning of what would prove to be a decade of relatively warm global temperatures--that yet another Norwegian sealer happened upon the remains of the Polar Expedition. Diaries and photos told the tale: Andrée, Frænkel and Strindberg had been forced down on the ice on the 14th of July, and had made a harrowing trek south in brutally difficult conditions. They had succumbed to their hardships in early October, shortly after reaching the island of Kvitøya, east of the Svalbard archipelago.
Their bodies were returned to Stockholm on October 5, 1930. They were received as heroes who had died in the service of science and progress; historian Sverker Sörlin called their cortege “one of the most solemn and grandiose manifestations of national mourning that has ever occurred in Sweden.” Their courage, fortitude and ingenuity are indeed praiseworthy.
Scenes from the Polar Expedition, courtesy Wikimedia CommonsClick thumbnail to view full-size
But let us praise Ekholm, too. He dared not only the physical dangers of the Arctic—with which he was acquainted from his service on the 1882 expedition—but also the social and moral dangers of bringing an unpopular message to both his leader, Andrée, and to the public at large. Equally daring scientifically in his “cosmical” speculations, and politically in his public challenge to the leadership of the Central Bureau of Meteorology, he nevertheless remained grounded in that most central of scientific attitudes: respect for what the data show. From Smedjebacken to Uppsala to Svalbard to Stockholm, this quality, above all his other virtues, served him well. His death may have been less-commemorated than those of fellow-aeronauts of the Örnen, but his life was many times more beneficial to Sweden, to himself and his family, to the institutions he served--and to the science which had been his life.
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