Antarctic Sea Ice Growth Caused by Meltwater. Guest essay by Eric Worrall According to climate scientists, less dense meltwater on the surface of the Antarctic ocean reduced convection between the surface and ocean depths, leaving heat trapped in the depths. One small area of ocean not changed by global warmingDate:May 6, 2020…Climate and marine scientists are observing pervasive warming of the ocean and the land surfaces across the globe. Since the middle of the 19th century, the average global temperature recorded on the land surface has risen by around one degree centigrade, and by 0.6 degrees across the ocean surface.
Global warming has been most pronounced in the alpine regions and the Arctic. …A few years ago, Haumann and Gruber and various colleagues already discovered the reason for this expansion of sea ice in the Southern Ocean. They noticed that stronger southerly winds over this period propelled more of the sea ice that is being formed along the coast out into the open sea, enhancing the melting there. Like this: Global Warming? “There’s some indication in the data that the pause is leaning toward a small reversal of the 20th-century trends.” Guest essay by Eric Worrall According to a study of the Southern Hemisphere, the warming we should have experienced global warming driven expansion of the Hadley Cell in the south and contraction of the JetStream to higher latitudes is being masked by the recovery of the Ozone Layer over Antarctica.
Shrinking Ozone Hole, Climate Change Are Causing Atmospheric “Tug of War”The Southern Hemisphere jet stream is shifting, bringing more rain to some spots and less to othersBy Chelsea Harvey, E&E News on March 26, 2020…But the ozone hole had another effect on the planet: It caused major atmospheric changes in the Southern Hemisphere.With less ozone trapping solar radiation higher in the atmosphere, the stratosphere began to cool. The jet stream shifted toward the South Pole.
The warm, wet tropics expanded, and the dry zone below the tropics shifted southward, as well. Weather patterns in certain parts of the Southern Hemisphere began to change. The abstract of the study; Like this: August 8, 2013. New research first to relate Antarctic sea ice melt to weather change in tropics. Diminishing sea ice translates to warmer ocean, more rain, and stronger trade winds University of California – San Diego Arctic and Antarctic ice loss will account for about one-fifth of the warming that is projected to happen in the tropics, according to a new study led by Mark England, a polar climate scientist at Scripps Institution of Oceanography at the University of California San Diego, and Lorenzo Polvani, the Maurice Ewing and J.
Lamar Worzel Professor of Geophysics at Columbia Engineering, England’s doctoral supervisor. While there is a growing body of research showing how the loss of Arctic sea ice affects other parts of the planet, this study is the first to also consider the long-range effect of Antarctic sea ice melt, the research team said. “We think this is a game-changer as it shows that ice loss at both poles is crucial to understanding future tropical climate change,” England said of the study funded by NASA and the National Science Foundation. From EurekAlert! Like this: Icebergs delay Southern Hemisphere future warming. Institute for Basic Science New research, published today in the journal Nature Climate Change, has found that Antarctic icebergs can weaken and delay the effect of Global Warming in the Southern Hemisphere. Unabated Global Warming threatens the stability of the Antarctic ice sheet.
Recent observations reveal a rapid thinning of the Pine Island and Thwaites glacier regions in Antarctica, which can be attributed partly to warming oceans. These findings have raised concerns of an accelerated ice loss of the West Antarctic ice sheet and potential contributions to global sea level rise. Ice loss can occur in the form of melt-induced (liquid) freshwater discharge into the ocean, or through (solid) iceberg calving. With a projected future retreat of the Antarctic ice sheet, scientists expect an intensification of iceberg discharge. Icebergs can persist for years and are carried by winds and currents through the Southern Ocean until they reach warmer waters and ultimately melt. Dr. Like this: Strong Storms Behind Antarctic Ice Shelf Collapse. Published on July 22, 2019 Written by Oregon State University A research team led by U.S. and Korean scientists deployed three moorings with hydrophones attached seaward of the Nansen Ice Shelf in Antarctica’s Ross Sea in December of 2015 and were able to record hundreds of short-duration, broadband signals indicating the fracturing of the ice shelf.
The “icequakes” primarily took place between January and March of 2016, with the front of the ice sheet calving into two giant icebergs on April 7. The day the icebergs drifted away from the shelf coincided with the largest low-pressure storm system the region had recorded in the previous seven months, the researchers say. Results of the study are being published this week in Frontiers in Earth Science.
SEE ALSO: Geological ‘Hotspot’ Melting Pine Island And Thwaites Glaciers, Not Global Warming Read rest at Phys.org Trackback from your site. Basal melting of Ross Ice Shelf from solar heat absorption in an ice-front polynya | Nature Geoscience. Study: Fewer Clouds Behind Antarctica's Strong Sea Ice Growth. Published on May 29, 2019 Written by Xinhua Researchers have discovered that lower cloud coverage in the Antarctic can promote sea ice growth. Unlike the rapid decline of Arctic sea ice in the warming climate, Antarctic sea ice witnessed a modest extension over the past four decades, according to the paper published in the Journal of Geophysical Research-Atmospheres.
The researchers from China and the United States found that Antarctic sea ice had a strong rebound from 2011 to 2012. “We quantified the effects on sea ice growth via a thermodynamic model based on reanalysis and satellite data and concluded that lower cloud coverage cooled the sea surface and accelerated the sea ice storage,” said Wang Yunhe, a researcher from the Institute of Oceanology, Chinese Academy of Sciences. “Clouds are like a down jacket for the Antarctic to preserve heat during winter,” said Bi Haibo, a researcher from the institute.
Read more at Xinhuanet Trackback from your site. Study: Increase in Antarctic Sea Ice due to changes in cloud cover. 'Remarkable year': What's behind the record low sea ice in Antarctica. It was in early August this year when Phil Reid, a climatologist with the Bureau of Meteorology, first noticed something odd happening to the ice around Antarctica. An area of ice had started to melt in the eastern Weddell Sea even though the region was still in darkness and air temperatures below freezing. This is a modal window. This modal can be closed by pressing the Escape key or activating the close button. Caption Settings Dialog Beginning of dialog window. Winners of the Kings Cross Coke sign auction The state of our climate in 2016 Australia is already experiencing an increase in extreme conditions from climate change - and it's projected to get worse.
Winners of the Kings Cross Coke sign ... Who buys a five-metre high neon letter? Bashed elderly woman left bloodied in bed New details have emerged about the brutal bashing of an elderly woman in her Toongabbie home. Body of grandfather found at Westfield 'Shots fired': when police chased the Stoccos Why I'm teaching ethics classes. Study: strong El Niño events increase height and mass of Antarctic ice shelves. From UCSD/Scripps Institution of Oceanography New study reveals strong El Niño events cause large changes in Antarctic ice shelves A new study published Jan. 8 in the journal Nature Geoscience reveals that strong El Nino events can cause significant ice loss in some Antarctic ice shelves while the opposite may occur during strong La Nina events.
El Niño and La Niña are two distinct phases of the El Niño/Southern Oscillation (ENSO), a naturally occurring phenomenon characterized by how water temperatures in the tropical Pacific periodically oscillate between warmer than average during El Niños and cooler during La Niñas. The research, funded by NASA and the NASA Earth and Space Science Fellowship, provides new insights into how Antarctic ice shelves respond to variability in global ocean and atmospheric conditions. The study was led by Fernando Paolo while a PhD graduate student and postdoc at Scripps Institution of Oceanography at the University of California San Diego. Abstract Like this:
Why Antarctica's sea ice cover is so low (and no, it's not just about climate change) Sea ice cover in Antarctica shrank rapidly to a record low in late 2016 and has remained well below average. But what’s behind this dramatic melting and low ice cover since? Our two articles published earlier this month suggest that a combination of natural variability in the atmosphere and ocean were to blame, though human-induced climate change may also play a role.
Read more: Record high to record low: what on earth is happening to Antarctica's sea ice? What happened to Antarctic sea ice in 2016? Antarctic sea ice is frozen seawater, usually less than a few metres thick. Sea ice cover in Antarctica is crucial to the global climate and marine ecosystems and satellites have been monitoring it since the late 1970s. Read more: Expanding sea ice is causing headaches for Antarctic stations However, in late 2016 Antarctic sea ice dramatically and rapidly melted reaching a record low. Hunting for clues Sea ice cover around Antarctica varies a lot from one year or decade to the next. Far Southern Ocean cools. Kiss Goodbye to polar amplication around Antarctica. A map of the sea surface zone that has cooled since 1979 — from 56S – 72S . It’s a pretty big area. Click to enlarge. For years the IPCC have said that warming would be amplified at the poles. They warned us things would heat up twice as fast, which would melt sea ice.
The oceans surface in turn would switch from being reflective white to a dark absorbing deep blue. Enormous amounts of energy would then flow into the ocean instead of being reflected back out to space. As the Arctic warmed, the merchants of doom were keen to tell us how how right they were and this was evidence of man-made warming. Mike Jonas has done what the IPCC should have been doing — investigating the trends in the Sea Surface Temperature in the polar latitudes with satellite records. It’s more evidence that things are seriously wrong in the global models. As McKitrick and Christy point out: Jo Author: M Jonas (Cover note of submission) Author’s affiliations: None Abstract Abbreviations 2.1 The Mechanism Figure 1. (a) (b) Claim: wind change around Antarctica may hasten sea level rise. New research shows projected changes in the winds circling the Antarctic may accelerate global sea level rise significantly more than previously estimated.
Changes to Antarctic winds have already been linked to southern Australia’s drying climate but now it appears they may also have a profound impact on warming ocean temperatures under the ice shelves along the coastline of West and East Antarctic. “When we included projected Antarctic wind shifts in a detailed global ocean model, we found water up to 4°C warmer than current temperatures rose up to meet the base of the Antarctic ice shelves,” said lead author Dr Paul Spence from the ARC Centre of Excellence for Climate System Science (ARCCSS). “The sub-surface warming revealed in this research is on average twice as large as previously estimated with almost all of coastal Antarctica affected.
This relatively warm water provides a huge reservoir of melt potential right near the grounding lines of ice shelves around Antarctica. Abstract. Claim: wind change around Antarctica may hasten sea level rise. NASA: Natural Causes Behind Polar Melt. In what amounts to dissension from National Aeronautics and Space Administration (NASA) climate change policy, a series of just-released studies by working-level scientists prove that geological and not atmospheric forces are responsible for melting of Earth’s polar ice sheets. Figure 1. The eruption of Antarctica’s Mount Erebus, one of the continent’s 149 active land volcanoes, many of which lie beneath miles of glacial ice.
Photo: see here A review of these studies and their significance relative to what force or forces control the climate and climate-related events of Earth’s polar regions is as follows. NASA Antarctica Study October 30, 2015 This research study authored by NASA Glaciologist Jay Zwally concluded that Antarctica is gaining, not losing, ice mass and thereby challenging the conclusions of many previous studies, most importantly the Intergovernmental Panel on Climate Change’s (IPCC) 2013 report (see the quote from the study below). NASA Antarctica Study November 7, 2017. Low Pressure System Responsible For Lower Antarctic Sea Ice Extent Last Month | NOT A LOT OF PEOPLE KNOW THAT.
By Paul Homewood A reader, (sorry, forgot who!) , pointed out last month the sharp drop in Antarctic sea ice early in September. It turns out that weather was to blame. From the NSIDC report for September: Antarctic sea ice extent reached 18.44 million square kilometers (7.12 million square miles) on August 31, 2016, and this appears to be the maximum extent for this year. This is the earliest maximum in the satellite record since 1979, and the first time the maximum has occurred in August. The early maximum appears to be the result of an intense wind pattern in September, spanning nearly half of the continent from the Wilkes Land area to the Weddell Sea, and centered on the Amundsen Sea.
Like this: Like Loading... Scientists find ‘natural pulses’ in recent melting of West Antarctic ice sheet. Natural ocean variability is heightening the rate of retreat of the West Antarctic ice sheet, a new study finds. A 16-year study of ocean conditions in Antarctica suggests that the periodic arrival of warm currents as a result of natural variability is worsening the rate of ice mass loss from key glaciers in the region. The natural pulses of warm water could be key to driving short-term changes in glacier ice mass loss, the lead author tells Carbon Brief. In the long term, this periodic ocean warming is likely to be exacerbated by climate change, he adds.
The new findings serve as a “smoking gun” by helping scientists to understand the mechanisms behind the ice sheet’s retreat, another scientist tells Carbon Brief. Breaking ice Antarctic ice melt is occuring at an increasingly rapid rate, according to recent satellite data, with mass loss from the West Antarctic ice sheet contributing the most to this rise. The ASE alone is currently responsible for a quarter of all of the world’s ice melt.
An Ice Shelf Is Cracking In Antarctica, But Not For The Reason You Think. A NASA scientist with project IceBridge took this photo of the crack in November. John Sonntag/NASA A group of scientists is gathering today in the U.K. to discuss a slab of ice that's cracking in Antarctica. The crack could soon split off a frozen chunk the size of Delaware. One glacier scientist, Heidi Sevestre, spent six weeks last year living on that giant slab of ice off the Antarctic Peninsula. "It's like being on a different planet," says Sevestre, a glaciologist with the University of St Andrews in Scotland. "Everything is gigantic, everything is white," she says. "When you're camping on the ice shelf, you have no idea that you're on something that is floating and moving," she says.
The ice shelf is in constant motion: rising with the tides, splitting off icebergs at its edges, and growing again as inland glaciers feed it. The ice shelf Sevestre was studying is called Larsen C, and it now has a massive 90-mile crack running through it. Ice Shelf Collapse Jeremy Harbeck/NASA. Antarctic Sea Ice Retreats Due To Wind Patterns | NOT A LOT OF PEOPLE KNOW THAT.
Bipolar disorder – as in the Arctic, the Antarctic sea ice extent is affected by wind, unless of course it’s ‘climate change’ | Watts Up With That? Claim: New Antarctic sea-ice extent due to wind and ‘atmospheric warming’ – what warming? | Watts Up With That? Larsen C Ice Shelf Crack Not Related To Climate Change …Ice “More Stable Than Previously Thought” Surprise: Antarctic Ice Shelves Growing, Variations Linked To Natural Ocean Cycles, Unrelated To ‘Global Warming’