A Change in Krill Ecosystem

Antarctic Peninsula has been experiencing warming trends for over 40 years with an increase of 2-3 C, thus correlating with lower sea ice conditions in the Amundsen Sea and Bellinghausen Sea. Warming temperatures around the Antarctic Peninsula is changing the dynamics of the ecosystem. The rise in atmospheric temperature is causing increasing in melting of freshwater glaciers and ice shelves. Fresh water emerging into the sea counteracts the salinity within a regional area. Changes identified are;

• Decrease in sea water salinity up to 60 miles offshore
• Lower sea ice
• Decreased krill population
• Increased salp (open ocean tunicate that is reminiscent of a jelly-fish) population
• Increase in cryptophytes (single cell phytoplankton algae)
• Decrease in diatom phytoplankton
• Increase in carbon sequestering in deep ocean sinks
• Decrease in carbon availability in the food chain

The Antarctic Krill (Euphausia superba), a small shrimp like crustacean is the most important zooplankton species associated with the sea ice and plays a crucial role in the Antarctic food web. On a regional basis the amount of krill appear to be declining in the southern ocean. There are definitely lower trends in krill population during lower sea ice years around Antarctica. Part of the rational for the population decline is that ice algae rely on the sea ice for protection and growth. The krill need the sea ice in order to feed on the algae and phytoplankton.

Krill occur in groups or large swarms. They are less than 3 inches in size and feed primarily on phytoplankton and sea ice algae. Krill filter diatom phytoplankton out of the water column and scrape algae from the sea ice. Apart from frequenting the sea ice to feed, krill in particular juveniles, seek protection from predators in the many nooks and crannies formed by the deformed sea ice floes. Krill is the staple food of many fish, birds and mammals in the Southern Ocean. The biomass of Antarctic krill is considered to be larger than that of the earth’s human population.

Sea- ice algae utilizes atmospheric carbon dioxide for its energy source, the same as plants do on land. Krill diet of the sea-ice algae and phytoplankton is essential for converting the carbon for use in higher animals such as fish, birds, and whales. This carbon conversion is a very critical role in predatory nutrition. Additionally krill do eliminate some of the silica from the diatom shells and carbon in sticky balls that sinks nearly two miles into the deep ocean. These cold, deep waters are able to contain carbon dioxide and prevent the gas from rising to the surface, thus immobilizing carbon that is not passed into the food chain.

In recent years there have been increases in algae phytoplankton called cryptophytes. Mark Moline, California Polytechnic State University, states that the cryptophyte population correlates with warmer temperatures and lower salinity waters that are produced by the melting of the freshwater glacier. Cryptophytes measure around 2 mm, while other plankton in the Antarctic waters are much larger and measure 15 to 270 mm. Along with the increase in cryptophyte population an increase in salp, a pelagic tunicate, population has also occurred. There are differences between salps and krill. Salps feeding efficiency is capable of grazing on smaller food sources less than 4mm, whereas, the Antarctic Krill efficiency declines on any food less than 20 mm. The salps compete with krill for the phytoplankton and thus decrease the krill population. Additionally the salps feed on krill larvae, which also cause a decline in krill numbers.

The warming trend in the Antarctic Peninsula is showing a pattern of increasing cryptophytes over other phytoplankton and the increase in the salp. This influence is due to the low sea ice and the lowering of the salinity in the seawater. Salps and cryptophytes do better in the lower salinity, while the krill and other plankton are unable to tolerate the increased freshwater regime from the glacier ice melts. This selectivity gives preference to the salps as the dominant species while decreasing krill abundance. During lower sea ice seasons the density of krill declines while the salp population increases.

Carbon sequestering into the deep ocean from the algae and phytoplankton occur by both the salp and krill. Both species eliminate the atmospheric carbon received from the primary producing algae by producing fecal pellets by the salps and sticky balls by the krill, thereby, reducing the amount of carbon dioxide in the atmosphere. The salps though sequester more carbon into the cold deep ocean than the krill. However, the krill provides the most efficient pathway for carbon transfer up into the food chain. The cryptophyte dominated waters are less efficient in the food chain due to increased feeding by salps and the difficulty of the krill to utilize the cryptophytes as a food source. Migration patterns by penguins are changing, in part due to the changing krill population. Krill is a mainstay diet for penguins, and if the krill population changes, many other ecological changes occur with it.

Steve Bynum has worked at Palmer Station along the Antarctic Peninsula. He not only enjoyed the ecosystem along the Bellinghausen Sea but he has also witnessed the changing climate conditions.

Join Steve at http://www.climatechangenewsletters.com as we take a journey to discover the warming and cooling effects of our planet.

Green Roof

Concerns over global warming and its effect to the environment have put pressure on every industry to clamp down on its energy consumption. For the computer makers and users alike, the “green” laptops are the future in mobile computing.
Since energy conservation is one prime adaptation measure that needs to be done, laptops that consume less energy are slowly gaining popularity. The lists of considerations in purchasing a laptop has gone longer and now includes energy efficiency. An ideal laptop would be one that consumes less energy, along with portability, connectivity and processing capabilities.
So what features does the green laptop of the feature need to have?
Energy Efficiency
We all know that laptops are trending towards smaller, sleeker and lighter proportions. Now, the trend towards greener performance is gaining ground. This means lesser energy consumption, longer battery life, and even alternative power sources.
There are now a lot of technologies that aims to minimizing energy wastage and consumption. The interventions include tweaking internal systems to automatically shut down unnecessary computer activities that waste energy such as the auto switch to hibernate mode when inactivity is noticed. The choice of display technology is also considered. Right now, the LCDs are the most popular. But an emerging alternative is being pushed. This is the OLED (Organic Light emitting Diode). It is said to draw less power and might have good aesthetic effects on the screen.
Solar-powered options and hybrids are also said to be in the works. Some promising tests have been shown to produce feasible and in fact cheaper models. Certainly, when the going gets tough, the research and design coverage and tasks become less mundane. While companies spend much resources to improving aesthetics, a number are now beefing up their research on greener mobile technologies. This is a good sign indeed.
Disposability and Recycling
It was surmised that the laptops disposed by China in 5 years time is enough to cover the whole of Netherlands with laptop scraps. This brings us to the issue of disposability.
First, a laptop has to be hardy enough to warrant that you do not need dispose and acquire new ones very often. Secondly, proper recycling and dumping options for gadgets, including laptops need to be addressed. This could take the form of manufacturers owning the responsibilities of recycling and disposing, especially those that are very hard to dispose. A number of companies already have recycling and disposal services for its customers. There are also big name non-profits that do the job.
It would be of help of techies themselves add pressure to manufacturers by refusing to buy gadgets without disposal services being guaranteed upon purchase. This, of course, would add up to the price of the merchandise. But that would be a small sacrifice for the benefit of the world.
Another option for techies would be to donate still-operational but old laptops to charitable organizations that can put it to better reuse.
Sustainable and Environment-Friendly Packaging
Another area that is fast gaining ground is the search for organic, bio-degradable and less costly packaging. Manufacturers themselves are hard into this and you could already see improvements in the newer products. A government mandate would add up to speeding the transition to more eco-friendly and biodegradable packaging materials. GP

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Are We to Blame For Global Warming?

Global warming is one of those topics that I still find myself wondering what to truly believe. Is our CO2 production really the culprit in the warming of the planet? Or are there some other larger influences at play here. I have a hard time believing mankind’s activities are solely to blame for any kind of climate change.

After all, CO2 is only one of many greenhouse gases that can affect the warming trend. Water vapor is by far the most abundant and effective at influencing the greenhouse problem. But I don’t see any kind of public concern over evaporation of water in any way at all. Okay, I realize that there is little or even nothing that can be done about that but the point is CO2 is just a tiny fraction of the greenhouse gases affecting our climate. So if water vapor is by far the largest greenhouse gas then why are we so obsessed by manmade CO2? Mankind’s ego.

We see a small trend in the planets temperature rising and of course we assume it must be what we are doing. I am truly pleased to see that we are taking an interest in reducing pollution from cars and industry but I really have my doubts about the connection to global warming at least in the significant way the media would like us to believe.

The media is sounding the alarm bell which of course sells more newspapers than reporting the less extreme predictions surrounding the warming trend. The weather models produced by scientists predict a reduction in the temperature differences between the poles and the equatorial regions. This will in fact reduce the number of violent tropical storms, as there will be less of a temperature discrepancy to stimulate them. Also the warming of the regions closer to the poles will allow agricultural pursuits in areas where it was not possible before. Food production would be able to rise accordingly. The alarmist media isn’t interested in those types of stories it seems.

The change in the world’s temperature is just that, change. There is irrefutable evidence that the temperature of the planet has and most likely will always be changing regardless of what we are doing. What are we so afraid of? Do the alarmists doubt mankind’s ability to adapt and cope with a few degrees of temperature change or even sea levels rising a meter or so? There will doubtless be hardships and even some displaced people in some regions but man has the ability to adapt and change. We have demonstrated this through the ages. I am confident that we will not only survive these changes but also learn to use them to our advantage.

I live in Canada and if you ask anyone living north of the temperate zone about rising temperatures the resounding response would be “bring it on, we could use a little global warming around here”. Life will improve greatly for huge numbers of the world’s population with a couple of degrees increase in the planet’s temperature. Migration to areas that were before considered uninhabitable by most will have a more moderate climate allowing for farming and other activities. You can’t sell newspapers with stories like that.

The scientific data indicates that 1998 was the warmest year on record. The planet has been cooling ever since. A quote from Dr. Oleg Sorokhtin of the Russian Academy of Natural Sciences “The earth is at the peak of one of its passing warm spells, It’ll start getting cold by 2012, and really, really cold around 2041″. So who are we to believe? A respected scientist or Al Gore who has made millions from his crusade for the planet and his questionable agenda and phony pseudo science.

If the planet is warming I can honestly say I hope so. We will get by and probably do well in the process. What really concerns me is the muzzling of real science in the debate. An objective media would go a long way in helping us all deal with the facts as they truly are. Focusing on the alarmist perspective only causes undue fear where none is warranted.

Is driving our SUV’s and minivans really the problem here? Or is our planet just going through another climate cycle like it has done so many times before? The only thing I know for sure is I can’t count on the media to provide the answers.

I recently produced the feature film The Harvest Project. Find out more and view the trailer at http://www.theharvestprojectmovie.com The movie is also available for sale at http://www.filmannex.com/search/searchkey/harvest%20project You can contact me at doug_king@shaw.ca

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