What contributed naval warfare to remarkable winter
and the Arctic sea ice in summer 1917?

Posted 31st March 2019

Sea Icea March 1917 - end of month-Do more than 5000 submerged merchant ships, two extremely winters, and Sea Ice June 1917the largest sea ice extent in the North Atlantic (NA) during the entire last Century, in summer 1917, fit together? Yes, at least it is the only convincing explanation for the three extraordinary events. The link is the naval war during the First World War (WWI), causing the extreme cold winter in Western Europe 1916/17, the NA sea-ice in summer 1917, and the record cold winter  1917/18 in North America, by fighting at sea, and U-boats alone could sink several thousand merchant ships from 1916 to 1918 (see Table). Let’s have a look at the three events.  

The winter 1916/17 in Europe

Anomaly from January 1917All those who lived in Europe through the winter of 1916-17 had Anomaly from February 1917memories of the bitterly freezing conditions, notoriously a very, very cold winter (More here) The Turnip Winter occurred during the winter of 1916–1917 in Germany. Continually poor weather conditions led to a diminished harvest, most notably in cereal productions. (More Wikipedia). The French winter of 1916-1917 was the extreme of cold. The bitter winter was the coldest in living memory for soldiers in France and Flanders. Soldiers suffered from frostbite and exposure, causing them to lose fingers (More).  In England the winter seasons (December-February) 1916/17 and 17/18 were both cold. One has to go back to 1891 to find an equivalent cold season (Details) The widespread destruction of Bird-life caused by the severe winter of 1916-1917, and more especially by the prolonged period of frost which extended late into the spring of 1917, was so noticeable that it attracted the attention of the least observant ( More)

Sea Ice April 1917 -end of month- Sea Ice May 1917 - end of month - Sea Ice July 1917 - end of month -

The link to naval war and ship losses  1916 to 1918

Although WWI started in August 1914, naval war began in earnest only two years later, when a series of Monthly Weather Reviewnew weapons were put in use: sea mines, depth charges, new sub-marines, Allied and Neutral Tonnage sunk in World War 1and airplanes. By then naval warfare had reached a destruction stage to which no one might have thought of only two years earlier. The situation became dramatic when U-boats destroyed more ships than Britain could build in early 1917. In April 1917, the same total rate of the previous annual rate of 1916, ca. 850,000 tons, was destroyed by U-boats. In April 1917, Britain together with the Allies lost 10 vessels every day. During the year of 1917, U-boats alone sank 6,200,000 tons, which means more than 3000 ships, and, during the war months of 1918, another 2,500,000 ship tonnage. The total loss of the Allies ship tonnage during WWI is of about 12,000,000 tons, namely 5,200 vessels. The total loss of the Allies together with the Axis naval vessels (battle ships, cruisers, destroyers, sub-marines, and other naval ships) amounted to 650, respectively 1,200,000 tons.

Naval war and the record summer sea ice extent in the North Atlantic

Since the seasonal sea ice extent is observed since the late 19th Century, it never reached a size as in Depth charges exploding during World War 1Air Temperature Celsius and north of 70 Celsius degrees Northsummer 1917. This year the Arctic sea ice has reached its annual maximum extent on March 13, 2019 (Details)  In spring 1917 it started to grow after the average annual peak extension in March/April that lasted well into June. From October 1916 to April 1917 U-boats sunk about 3,5 Mio gross-ton, or about 7 to 8 ships per day. Many thousands other naval activities in the north-eastern NA, as shelling, depth charging, torpedoing, and seas mining have altering the sea conditions as well. Not only the ‘natural’ structure of the sea surface concerning temperature and salinity was affected, but it meant that possibly several hundred thousand tons of dry cargo and from oil tankers, covered huge sea areas for some time, and moved northward with the prevailing sea currents. Little speaks for the assumption, that the growth of sea ice after passing the seasonal peak in Anomaly of December 1917April had been a mere ‘natural’ incident. Those who claim so have to Exploding ship during Wolrd War 1explain why, because it happened only once during the last 120 years. A convincing answer could also explain why the following extreme winter caught the east of North America by surprise.

The winter 1917/18 was extreme in North America.

Illusions about weather in the winter of 1917-1918 in the history of New York CityAlso the next winter of 1917-18 was almost as brutal as WWI (see HERE), the main burden fell on North America. From December 1 to 31 1917 a severe cold World War 1 and the big shift in the Northern North Atlanticwave in Interior Alaska produces the coldest recorded mean monthly temperatures in the United States. Fort Yukon averages −48.3 °F or −44.6 °C and Eagle −46 °F or −43.3 °C. December 1917 through January 1918 still stands today as the coldest and snowiest December-January period ever recorded in Louisville, Lexington, Bowling Green, and several other locations across southern Indiana and central Kentucky. The 49 inches of snow that buried Louisville during those two months beats the 2nd snowiest December-January by more than a foot and a half (see: National Weather Service), mentioning i.e. that the twelfth day of 1918 Departure from 1981 to 2010 Normals“was probably the coldest and most disagreeable day experienced in a Anomaly of December/January/February in 1917-1918century” (Monthly Weather Review), or at least since the intense cold of January 1, 1864 (Climatological Data).  At 7am, winds were blowing at 20 to 30 mph while the temperature at Louisville was fifteen degrees below zero and Lexington was fourteen below. Using the modern calculation, that gives a wind chill around 45 degrees below zero!

The cold winter of 1917-18Years later on Feb. 20, 1977 the NYT considered worth to remind that “The Winter of 1917–18 Was a Cold One…” noting that It had been such a cold January that, at the end of it, G. Harold Noyes, the meteorologist in charge of the Weather Bureau in Trenton, said that maybe the old timers would stop saying that winters weren’t what they used to be.


Naval ships during warIt seems high time to investigate and proof what naval warfare contributed to winter weather 1916/17 in Europe and 1917/18 in North America, as well as the extraordinary sea ice developments after April 1917 and its extent in summer 1917. After more than 100 years have passed, any further waiting is hardly in the interest for a better understanding of climate change, and whether man has contributed to the three discussed events in the second half of the First World War.

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