Wednesday, December 18, 2024

World's most dangerous sea passage : the Drakes Passage

 
From MarineInsight by Zhara Ahmed
 
You must have heard of the Panama Canal, a marvel of engineering that revolutionised travel by significantly reducing the time it takes to ship goods around South America.
But before this shortcut existed, sailors had to brave a much more treacherous route: the Drake Passage.
 

 
The Drake Passage, a 620-mile body of water separating Cape Horn, Chile from Antarctica, is as legendary as perilous.
Imagine the distance between London and Berlin condensed into a churning seaway where the Pacific and Atlantic Oceans collide.

The average depth here is a staggering 11,150 feet, with some areas plunging deeper than the peak of Mont Blanc!
This infamous strait isn’t just a geographical curiosity; it’s a rite of passage for some of history’s most daring explorers, and a region even seasoned mariners avoid at all costs.

The passage is named after Sir Francis Drake, a swashbuckling Elizabethan seaman who spent his life plundering for the British crown.
In 1577, Drake led an expedition to find a passage around South America.

While he never actually crossed the Drake Passage itself, his journey paved the way for future exploration.
Interestingly, the first sighting is attributed to Spanish explorer Francisco de Hoces decades earlier.

Even today, some call this route Mar de Hoces. This route, around Cape Horn, remained crucial until the Panama Canal opened.

The Drake Passage in the GeoGarage platform (UKHO nautical raster chart)

So what makes the Drake Passage so dangerous?


Firstly, its remote location offers no refuge in case of emergencies.
Ships must be well-equipped and self-sufficient for the journey.
Secondly, the waters are some of the coldest unfrozen on Earth, making hypothermia a constant threat for anyone who falls overboard.
Thirdly, the passage is a battleground where currents from the Pacific, Atlantic, and Antarctica collide, creating unpredictable and turbulent conditions.

Finally, the winds here are no joke.
Nicknamed the Roaring Forties, Furious Fifties, and Screaming Sixties for their ferocity based on latitude, they whip up monstrous waves and choppy seas, making navigation a terrifying ordeal.

Centuries before Antarctica’s discovery, Captain James Cook ventured south in 1772, reaching record latitudes but missing the continent itself.
His warnings didn’t deter 19th-century explorers like John Davies and Robert Falcon Scott, who braved the region’s dangers for seal hunting and exploration.

Tragedies like Shackleton’s Endurance, trapped in ice, showcased both human courage and the unforgiving nature of the region.

Even today, the Drake Passage continues to challenge those who dare to cross it.
In 2012, a yacht named Mar Sem Fim encountered hurricane-force winds and was ultimately wrecked on the Antarctic ice.

It is estimated that Drake’s Passage contains about 800 shipwrecks, where around 20,000 sailors have lost their lives.

The most recent accident in Drake’s Passage occurred in 2022 on a Viking cruise ship.
A rouge wave smashed through a window, which sent broken glass flying.
Sadly, a 62-year-old woman was killed and 4 other passengers suffered injuries.

Today, scientists continue to study the Drake Passage, not just to understand the past but also to predict the future of our planet’s climate.

While exploration technology has improved, the respect for the Drake Passage’s power remains paramount.
It serves as a reminder of humanity’s smallness in the face of nature’s might, and the delicate balance between courage and recklessness.
 

Tuesday, December 17, 2024

A new layer in the GeoGarage platform : Argentina nautical charts based on rasterized ENC material from SHN

 Availability of a new dedicated layer for Argentina with SHN rasterized ENCs (full catalogue)
 
The layer also contains charts for Antarctica areas managed by SHN
so 6 ENC for : Coronation & Laurie Island, Esperanza, Primavera, Melchior, San Martin Bases & Deception Island
 
Until today, the GeoGarage platform used the raster paper chart material (RNC) provided by SHN to display nautical charts for the Argentina areas.

For internal management reasons specific to SHN (Serviceio de Hidrografia Naval) -the Argentina Hydrographic Office- has canceled the delivery of updated RNCs.
By the way, the availibility of RNCs was not completed (83 raster charts on a total of 144 paper maps).

The GeoGarage platform was already in the capacity to deliver a rasterized visualization of Electronic Navigation Chart (vector ENC) through their web services (WMTS) for their B2B customers involved in webmapping and other onshore GIS activities.

Today, the GeoGarage platform is now ready to propose the visualization of official ENC to their customers using mobile navigation apps (non SOLAS) so Weather 4D Routing and Navigation on iOS and SailGrib on Android.
 
In consequence, the GeoGarage platform no longer offers a subscription to Argentina Raster charts for Argentina on its e-commerce platform for mobile apps.
However, the Argentina RNC subscription will continue for their current mobile customers until its expiry date (visible on your W4D R&N/Sailgrib application) but will not be automatically renewed on this date.

The RNC plan is replaced by a new layer based on ENC type maps edited by the Servicio de Hidrografia Naval (SHN), and rasterized for W4D/Sailgrib : Argentina (derived from SHN ENC)
The price of the annual subscription is now 38.99 EUR.
 
So Weather4D R&N and Sailgrib users (with last updated versions) can right now display the whole catalogue of NLHO ENC (107 ENC at this time), with a half-yearly updating process : see GeoGarage news

Today, in this first version, the vector ENC are displayed using a graphical rendering similar to the one used in official ECDIS (s-52 IHO specifications) : they are not to be used for shipping navigation (IMO SOLAS), but only for recreative use, not as a primary tool for navigation.
Effectively, in contrast to the use in ECDIS, there is no possibility -today with the W4D/SailGrib current version- to ask for text info and details regarding any navigational objects (beacon, buoy, marks...).
 
View of Buenos Aires harbor with RNC chart
 
View of Buenos Aires harbor with ENC chart
 

China unveils a new unmanned warship, the "Killer Whale"

 
Via Chinese social media

From Maritime Executive

An unusual trimaran drone ship was spotted at Guangzhou Shipyard earlier this year, and it has now made its first public appearance. On Friday, at the Zhuhai Airshow, the PLA Navy unveiled a new surface combatant called the "Killer Whale" - a miniature warship with an operating concept much like the U.S. Navy's Independence-class Littoral Combat Ship, but smaller and potentially without crew.

According to Chinese media, the vessel has a length of 190 feet and displaces about 300-500 tonnes, with a maximum speed of 40 knots and a range of about 4,000 nautical miles. It is reportedly fitted to carry a wide array of weaponry - antiship missiles, antiaircraft missiles, torpedoes, and a drone helicopter on the rear deck. 


Its most notable feature might be the resuscitation of the "modular mission package" concept, which first entered full-scale service with the debut of the Littoral Combat Ship in the 2010s. The underlying concept was to field a multipurpose vessel that could carry "swappable" weapons packages for different missions - mine warfare, antisubmarine warfare and surface warfare. In practice, the U.S. Navy was not able to develop or operationalize the "swappable" concept aboard its two LCS classes, and each LCS vessel is now permanently fitted with specific equipment.

According to local media, the new Killer Whale's mission sets include surveillance patrols, surface warfare, anti-submarine operations, and air defense missions. It can be reconfigured for "sea battlefield environment surveys and rescue in distress," making it an "all-around warrior."


Though designed by CSSC's autonomous vessel specialists and designated as unmanned, the new USV also has a prominent wraparound bridge deck for human watchstanders. Naval analysts have noted that it bears a striking resemblance to Indonesia's manned Klewang-class fast attack craft: The carbon fiber Klewang-class is longer, narrower, and has less range and payload, but has a comparable top speed and a superficially similar appearance.
 
  • Illustrations and scale models of the Killer Whale's design have appeared at Chinese defense trade shows over the past two years under the program name "JARI-USV-A." Open-source intelligence analysts first spotted the full-sizgoog_535963585e prototype in satellite imagery at CSSC Guangzhou Shipyard last month.


Links :

Monday, December 16, 2024

Arctic tundra is now emitting more carbon than it absorbs, US agency says


From The Guardian by Dharna Noor

Drastic shift driven by frequent wildfires, pushing surface air temperatures to second-warmest on record since 1900

The Arctic tundra is undergoing a dramatic transformation, driven by frequent wildfires that are turning it into a net source of carbon dioxide emissions after millennia of acting as a carbon sink, the US National Oceanic and Atmospheric Administration (Noaa) said on Tuesday.

This drastic shift is detailed in Noaa’s 2024 Arctic Report Card, which revealed that annual surface air temperatures in the Arctic this year were the second-warmest on record since 1900.

“Our observations now show that the Arctic tundra, which is experiencing warming and increased wildfire, is now emitting more carbon than it stores, which will worsen climate change impacts,” said Rick Spinrad, a Noaa administrator.

NOAA Arctic Report Card: Update for 2024 - Tracking recent environmental changes, with 12 essays prepared by an international team of 97 researchers from 11 different countries and an independent peer review organized by the Arctic Monitoring and Assessment Programme of the Arctic Council.
In the ocean :
In September 2024, the extent of Arctic sea ice, which has a profound influence on the polar environment, was the sixth-lowest in the 45-year satellite record.
All 18 of the lowest September minimum ice extents have occurred in the last 18 years.
Arctic Ocean regions that were ice-free in August have been warming at a rate of 0.5 degrees F (0.3 degrees C) per decade since 1982.
In most of the shallow seas that ring the Arctic Ocean, August mean sea surface temperatures were 3.6–7.2 degrees F (2–4 degrees C) warmer than 1991-2020 averages, while the Chukchi Sea were 1.8–7.2 degrees F (1–4 degrees C) cooler than average.
Plankton blooms — the base of the marine food chain — continue to increase in all Arctic regions, except for the Pacific Arctic, throughout the observational record of 2003–2024. However, in 2024, lower-than-average values were dominant across much of the Arctic.
Ice seal populations remain healthy in the Pacific Arctic, though their diets are shifting from Arctic cod to saffron cod with warming waters. 
 
The report, led by scientists from the Woodwell Climate Research Center in Falmouth, Massachusetts, found that the Arctic is warming faster than the global average for the 11th year in a row.

Currently, it is warming at up to four times the global rate, the authors found.

Climate warming has dual effects on the Arctic.
While it stimulates plant productivity and growth, which remove carbon dioxide from the atmosphere, it also leads to increased surface air temperatures that cause permafrost to thaw.

When permafrost thaws, carbon trapped in the frozen soil is decomposed by microbes and released into the atmosphere as carbon dioxide and methane, two potent greenhouse gases.

“We need accurate, holistic and comprehensive knowledge of how climate changes will affect the amount of carbon the Arctic is taking up and storing, and how much it’s releasing back into the atmosphere, in order to effectively address this crisis,” said Dr Sue Natali, a scientist at the Woodwell Center who contributed to the research.
“This report represents a critical step toward quantifying these emissions at scale.”

Human-caused climate change is also intensifying high-latitude wildfires, which have increased in burned area, intensity and associated carbon emissions.

Wildfires not only combust vegetation and soil organic matter, releasing carbon into the atmosphere, but they also strip away insulating soil layers, accelerating long-term permafrost thaw and its associated carbon emissions.


“In recent years, we’ve seen how increasing fire activity from climate change threatens both communities and the carbon stored in permafrost, but now we’re beginning to be able to measure the cumulative impact to the atmosphere, and it’s significant,” said Dr Brendan Rogers, Woodwell Climate scientist and report contributor.

Since 2003, circumpolar wildfire emissions have averaged 207m tons of carbon annually, according to Noaa.
At the same time, Arctic terrestrial ecosystems have remained a consistent source of methane.

“The climate catastrophe we’re seeing in the Arctic is already bringing consequences for communities around the world,” said Brenda Ekwurzel, a climate scientist at the Union of Concerned Scientists.

“The alarming harbinger of a net carbon source being unleashed sooner rather than later doesn’t bode well.
Once reached, many of these thresholds of adverse impacts on ecosystems cannot be reversed.”
 
Links :

Sunday, December 15, 2024

Eden's whale's incredible new hunting technique helps survival


As agricultural pollution suffocates the ocean, Eden's whales have had to adjust their hunting methods. This adaptation highlights the urgent need for all species to evolve quickly in a world where our actions are rapidly altering their habitats.