Archive by Author | Kevin Wood

A winter reflection

An old shipmate of mine shares this poem every December, and it always makes me pause to reflect on my former career at sea, and those friends I’ve sailed with now scattered far and wide. And us Old Weather shipmates have also seen plenty of stories like this along the 45 million or so miles of ship tracks we’ve covered over the past ten years. Some, like that of the USS Jeannette, a worse tale. My own encounter with the hard edge of the ocean was on the distant rocky shore of a small island in the Beagle Channel, the strait in Tierra del Fuego named, appropriately, after the HMS Beagle. We were holed from stem to stern, but thanks to the ship’s engineers, lots of pumps, and an ice-strengthened hull of inch-and-a-half thick steel, it came out okay in the end. So as this horrible pandemic year draws to close, I say, shipmates, let us hold with hope – we will clear this weary headland and find the open sea again.

Christmas at Sea, by Robert Louis Stevenson, first published on December 22, 1888

The sheets were frozen hard, and they cut the naked hand;
The decks were like a slide, where a seamen scarce could stand;
The wind was a nor’wester, blowing squally off the sea;
And cliffs and spouting breakers were the only things a-lee.

They heard the surf a-roaring before the break of day;
But ’twas only with the peep of light we saw how ill we lay.
We tumbled every hand on deck instanter, with a shout,
And we gave her the maintops’l, and stood by to go about.

All day we tacked and tacked between the South Head and the North;
All day we hauled the frozen sheets, and got no further forth;
All day as cold as charity, in bitter pain and dread,
For very life and nature we tacked from head to head.

We gave the South a wider berth, for there the tide-race roared;
But every tack we made we brought the North Head close aboard:
So’s we saw the cliffs and houses, and the breakers running high,
And the coastguard in his garden, with his glass against his eye.

The frost was on the village roofs as white as ocean foam;
The good red fires were burning bright in every ‘long-shore home;
The windows sparkled clear, and the chimneys volleyed out;
And I vow we sniffed the victuals as the vessel went about.

The bells upon the church were rung with a mighty jovial cheer;
For it’s just that I should tell you how (of all days in the year)
This day of our adversity was blessed Christmas morn,
And the house above the coastguard’s was the house where I was born.

O well I saw the pleasant room, the pleasant faces there,
My mother’s silver spectacles, my father’s silver hair;
And well I saw the firelight, like a flight of homely elves,
Go dancing round the china-plates that stand upon the shelves.

And well I knew the talk they had, the talk that was of me,
Of the shadow on the household and the son that went to sea;
And O the wicked fool I seemed, in every kind of way,
To be here and hauling frozen ropes on blessed Christmas Day.

They lit the high sea-light, and the dark began to fall.
“All hands to loose topgallant sails,” I heard the captain call.
“By the Lord, she’ll never stand it,” our first mate Jackson, cried.
…”It’s the one way or the other, Mr. Jackson,” he replied.

She staggered to her bearings, but the sails were new and good,
And the ship smelt up to windward just as though she understood.
As the winter’s day was ending, in the entry of the night,
We cleared the weary headland, and passed below the light.

And they heaved a mighty breath, every soul on board but me,
As they saw her nose again pointing handsome out to sea;
But all that I could think of, in the darkness and the cold,
Was just that I was leaving home and my folks were growing old.

A new Old Weather project

Old Weather – WW2 is now an active Zooniverse project. The purpose of this project is to recover hidden marine weather data recorded in U.S. Navy ships’ logbooks during World War II. Like all Old Weather projects, these data will be used to drive sophisticated computer models that help us understand and reconstruct weather and climate in extraordinary detail. But there is another goal that is just as vital – to uncover the source of a mysterious distortion in sea-surface temperature data collected during the war.

This distortion, which Chan & Huybers refer to as the World War II Warm Anomaly, may not be physical in nature, but, they argue, arises from earlier bias adjustments applied to correct for differences in sampling methods. The age-old technique of hauling up a bucket of seawater then taking its temperature on deck produces a different value compared to those collected from an engine-room cooling water intake, for example. There may even be differences in values because of the characteristics of particular ships, especially how deep they sit in the water (their draft). So knowing the fleet composition within the data set, and the specifics of how the measurements were made is crucial to teasing out an answer.

Because of the work we’ve been doing with the U.S. National Archives over the past eight years or so we are in a unique position to help investigate this question – we have digital images of many of the original U.S. Navy logbooks. The logs we are transcribing in this project were selected because the ships were often in the same place at the same time, even moored alongside each other in nests. All but two survived the entire war, 1941-1945. Twelve were based at Pearl Harbor in 1941, eighteen were in the Aleutian Islands in 1942-1943, and ten were caught in Typhoon Cobra in December 1944. This opens up many opportunities to investigate sources of bias, from factors associated with different ship types, the weather instruments in use at different times, or changes in methods required by wartime operations (such as blackout for example). It will also be possible to investigate how tropical and sub-polar environments may have influenced the data in different ways.

Moreover, with logbooks in hand, we can also better understand legacy issues associated with U.S. Navy data key-punched onto IBM cards in the early 1950s and subsequently migrated into today’s widely used International Comprehensive Ocean Atmosphere Data Set (ICOADS). Already we have found out that the fleet composition represented in ICOADS is tilted toward submarines, destroyers, and destroyer escorts. Aircraft carriers, with probably the best-equipped and best-trained weather personnel in the Navy, appear to be mostly neglected.

The World War II Warm Anomaly is large enough to appear in the long-term global mean sea-surface temperature record. This presents as an aspect of natural variability that may not in fact be real. If this turns out to be true, the corrected temperature record would appear to evolve upward more smoothly over time, and correspond more closely to model results as described by Chan & Huybers.