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Wed, 19 Jan 2022
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Beryllium 10 as climate proxy

greenland map icecap
© unknown

Beryllium-10 is an isotope that is a proxy for the sun's activity. Be10 is produced in the atmosphere by cosmic ray collisions with atoms of oxygen and nitrogen. Beryllium 10 concentrations are linked to cosmic ray intensity which can be a proxy for solar strength.

One way to capture earth's record of that proxy data is to drill deep ice cores. Greenland, due to having a large and relatively stable deep ice sheet is often the target for drilling ice cores.

Isotopic analysis of the ice in the core can be linked to temperature and global sea level variations. Analysis of the air contained in bubbles in the ice can reveal the palaeocomposition of the atmosphere, in particular CO2 variations. Volcanic eruptions leave identifiable ash layers.

While it sounds simple to analyze, there are issues of ice compression, flow, and other factors that must be taken into consideration when doing reconstructions from such data. I attended a talk at ICCC 09 that showed one of the ice core operations had procedures that left significant contamination issues for CO2. But since Beryllium is rather rare, it doesn't seem to have the same contamination issues attached. - Anthony Watts

Bug

Canada: "Pine Beetle Kill" No Longer Just Dead Wood

2010 Olympic Oval
© Holly Pyhtila/IPS
New 2010 Olympic Oval roof made from salvaged "pine beetle" wood.
Vancouver - The sheer magnitude of the devastation left by this tiny beetle is shocking on its own.

"The pine beetle kill", as it's known to British Columbians, refers to the millions of hectares of trees left for dead in the wake of the voracious insect. Forestry officials in Canada's westernmost province estimate the volume of wood lost to be around 620 million cubic metres - roughly equivalent to 15 million logging truck loads.

According to a B.C. Ministry of Forests report, roughly half of the province's pine trees are now destroyed by the bug, with the most extensive damage occurring in the central Canadian Rockies, where two-thirds of the region's lodgepole pine forests have been transformed into a sea of orange needles.

The beetle's environmental impact is just as impressive, as the death of billions of trees normally involved in capturing carbon have instead released carbon. Canadian Forest Service scientist Werner Kurz estimates the beetle's devastation will release almost a billion megatonnes of greenhouse gases into the atmosphere by 2020, equivalent to about five years of transportation sector emissions from Canada.

Chalkboard

Man's contribution to climate change is negligible in geologic time

Most geologists, including those in the energy business, take a REALLY long view of the earth's history including global warming and cooling cycles. Within the framework of geologic time, i.e. the earth's history, man is a very late entry and relatively small contributor to climate changes.

The current debate concerning global warming is well publicized. It features histrionic presentations of data on both sides of the issue usually by writers or politicians, with no scientific background, "interpreting" volumes of data gathered by true scientists. The arguments, for and against, have been going on for about 40 years. The earth is about 4.6 billion (4,600,000,000) years old so the debate has been going on for about 0.000001% of geologic time. Man, or at least our earliest demonstrable "human" ancestors, arrived about 2.3 million (2,300,000) years ago so "man" has been an observer of climate change for about 0.05% of geologic time.

Phoenix

Underwater volcano creates new island off Tonga

Image
© Telusa Fotu/AFP/Getty Images
The powerful underwater volcano that erupted in the south Pacific this week has created a new island off the coast of Tonga. The eruption, about 39 miles north-west of the Tongan capital, Nuku'alofa, began on Monday, shooting rocks, steam and ash thousands of feet into the air.

Tonga's chief geologist, Kelepi Mafi, said the volcano had two vents, one on a small uninhabited island and another about 100 metres (330ft) offshore. Rock and ash spewing from the sea have filled the gap between the two vents, creating a new land mass measuring hundreds of square metres.

Binoculars

One Third of U.S. Bird Species in Peril

Image
© eFluxMedia
There are about 800 species of birds in our country and almost one third of those are "endangered, threatened or in significant decline." These are the findings of a study that not only found the main causes (habitat loss, invasive species and human behavior), but also gave some solutions to the problem: conservation.

Conservation measures were already taken in the case of some bird species and it really showed. Those species of birds showed significant recovery.

Cloud Lightning

Canada: Rainy forecast raises flood concerns along Red River

Winnipeg - Flood Of 97
© unknown
Near Winnepeg during the Red River flood of 1997.
Provincial officials issue standby orders in Manitoba

The latest weather reports have officials in Fargo, N.D., ramping up emergency flooding efforts, as Manitoba communities await a provincial flood forecast on Friday.

Volunteers in North Dakota have begun packing 1.5 million sandbags after forecasters said an approaching weather system may deliver 20 to 60 millimetres of rain across the state and into Manitoba.

The ground in the region is already saturated with three times the normal amount of moisture.

Manitoba latest is awaiting the flood forecast, but provincial officials have already issued standby orders to mayors and reeves in communities along the Red River.

The weather system bearing down on Fargo is not expected to drop as much rain in Manitoba.

The Red River is expected to crest around the end of March, about two weeks earlier than initially anticipated.

Camera

South Africa: Pink elephant is caught on camera

Pink elephant I
© Mike Holding
The little pink calf was spotted in amongst an 80-strong elephant herd
A pink baby elephant has been caught on camera in Botswana.

A wildlife cameraman took pictures of the calf when he spotted it among a herd of about 80 elephants in the Okavango Delta.

Experts believe it is probably an albino, which is an extremely rare phenomenon in African elephants.

They are unsure of its chances of long-term survival - the blazing African sunlight may cause blindness and skin problems for the calf.

Mike Holding, who spotted the baby while filming for a BBC wildlife programme, said: "We only saw it for a couple of minutes as the herd crossed the river.

Fish

Major Losses For Caribbean Reef Fish In Last 15 Years

Image
© iStockphoto/David Safanda
By combining data from 48 studies of coral reefs from around the Caribbean, researchers have found that fish densities that have been stable for decades have given way to significant declines since 1995.

By combining data from 48 studies of coral reefs from around the Caribbean, researchers have found that fish densities that have been stable for decades have given way to significant declines since 1995.

"We were most surprised to discover that this decrease is evident for both large-bodied species targeted by fisheries as well as small-bodied species that are not fished," said Michelle Paddack of Simon Fraser University in Canada. "This suggests that overfishing is probably not the only cause."

Rather, they suggest that the recent declines may be explained by drastic losses in coral cover and other changes in coral reef habitats that have occurred in the Caribbean over the past 30 years. Those changes are the result of many factors, including warming ocean temperatures, coral diseases, and a rise in sedimentation and pollution from coastal development. Overfishing has also led to declines of many fish species, and now seems to also be removing those that are important for keeping the reefs free of algae.

Video

Video: Undersea volcano erupts near Tonga in Pacific ocean

Spectacular footage has been captured of an undersea volcano that has been erupting for days near Tonga - shooting smoke, steam and ash thousands of feet into the sky above the South Pacific ocean.


Heart

Hunting of baby harp seals is banned in Russia

The Russian government has announced a ban on the hunting of harp seals younger than 1 year old.

Following a statement by Prime Minister Vladimir Putin that it is "such a bloody hunt, and it is clear that it should have been banned a long time ago," the Russian Federal Fisheries Agency updated a ruling from last month, which banned hunting seals younger than a month old, to instead ban the hunting of seals under 1 year of age.