Climate Revision Online

Dear All

Welcome to tonights blog, you dont need an account, so starting at 730 please join in with any questions relating to climate!

New Volcano Pictures!

As you have probably guessed, I do love a good volcano photo, and before I start blogging about the purely academic and revision based, here is a brief Photo essay of pinched images of the current Grimsvotn Eruption.

A very dramatic skyline, volcanic eruptions produce sulphur and ash which refract the sunlight creating some truly spectacular sunsets. To place the eruption in a wider atmospheric context, here is a satellite image of the UK and Iceland, as you will all know, this eruption is likely to be nowhere near as disruptive as the last one from E15, as the current weather system is a depression, it should move off to the North East, which will blow ash away from us.

Sometimes, the eruptions produce these rather lovely cloud formations:

In terms of political Impacts, Obama flew to London a day early to avoid the potential ash chaos:

The Ash is also less likely to cause disruption die to the new Met Office/Aviation rulings on ash in jet engines, which is now 20 times the original level, and a limit of 4000 micrograms per second. 

And a good picture of an Icelandic Dirty Thunderstorm:

Pretty cool, or actually scorching hot, but a very special sight! A lot of you have asked me today why it is that the last year has seen so many Icelandic eruptions, the answer is not too simple, the last 20 years have been unusually quiet, and with the added complication of the volcano/Ice melt feedback cycle (Ice sheets decay faster, less pressure on Magma chambers, therefore the magma chamber has "space" fills with magma, especially in the spring, and is likely to lead to more high latitude eruptions, which for those of you following this, may kick us back into a cold period due to reflection of UV in the upper atmosphere. Perfect negative feedback)

Grimsvotn eruption

This month has seen the start of a new volcanic eruption in Iceland. It is worth noting it is unlikely to cause the level of disruption seen last year with the E15 eruption, this is Grimsvotn, Iceland’s most frequently erupting volcano in Historical times. It erupted a little bit last year, and does so every few years, and instead of Ash being the main concern, this one tends to produce Jokulhaulps of some magnitude.

Words cannot express how much I would like to be in that plane...

Some background to begin, this is part of what is known as the Vatnajokul Ice Cap, this the largest Ice cap in Iceland, also in Europe, and is home to several volcanoes, Grimsvotn is one of these, and is the main volcano from which the infamous Laki eruption of 1783 started (Laki is a fissure that comes from the same fracture zone and geothermal field).

Grimsvotn’s last eruption was November 2010, but its most famous was the 1996 eruption, forming a cauldron in the ice sheet, attracting world media attention and then quite stubbornly, not releasing the massive Jokulhaulps until after most of the journalists had left the Island. In fact it took 6 weeks for the sub glacial melt to make it to the Sandur, the vast volcanic desert plains that make up much of Iceland’s south coast, and have been formed by successive glacial bursts.

The Grimsvotn Cauldron, pictured in 2004, the vent beneath the Ice has erupted and the cauldron clearly visible

Vatnajokul is an unusual ice cap, it houses a large volcanic lake underneath the ice, and this is the main threat, the lake is dammed in to a certain level, but can be easily overtopped when an eruption melts more if the basal ice. This leads to flooding, but as it is a well-known and practised process, rarely cause much disruption to the Icelandic’s, though disruption to the rest of the world is left to p[lay out this week (Again, unlikely, the alarmists are making a story here, but last year was a fluke of an ash laden eruption and unusual prevailing winds). These glacial lake outbursts occur after the start of the eruption, but can take weeks, Iceland is well equipped for this and used to it, and their roads and public services are restored very quickly afterwards.

Sub glacial eruptions are well known to be ashy, even though the nature of most of Iceland’s volcanoes is Basaltic as the contact between hot magma and ice produces instantaneous fracturing of the magma, and steam, this was the main issue with E15, in that steam rising with heavy ash content causes problems for Jet Engines. This time, Easy jet have latched onto a positive of the potentially looming ash cloud, but testing their new Airborne Volcanic Object Identifier and Detector, which they were going to test in the Pacific, but now have a testing ground significantly closer to home. Do remember that each natural disaster is an opportunity for us to learn more and fine tune our management, prediction and mitigation strategies.

This particular eruption, is reportedly already subsiding, there is a very high incidence of dirty thunderstorms, and as soon as any are published, which will be soon, I will add them to the blog, in the meantime, have a look at some of these lovely other photos of the plume, and some Icelandic ponies.

Ongoing Live Questions

Hello Upper Sixth!

This is a bit of an experiment, you can post questions here and i can answer them, it is ongoign, so the response may not be immediate, but i would like you to use it as a place to make suggestions for resources/help over the half term period.

I havent used this particular piece of technology before, the Lower Sixth Geologists have had a number of evening revision sessions using something similar, but this is a work in progress, so.....

What it could be used for - comments of case studies, suggestions on what to cover in class next week, requests for further information, I will be posting relevant articles, links to resources as i make them, and updates on events at college after you finish next week.

All feedback much appreciated!

Millie

Hazards Revision Session

This is a live online Q and A, intended as a place for those of you in exams for the day to ask anything you may need to after college. Attendance is non compulsory, you dont need to create an account, you just go to the blog (this page) type a question and i will answer, bear in mind your comments are not published live, but are published by me, and if it is a long question, please give me a few minutes to type!

There will be a separate climate session on the tuesday after the climate revision day

Hello Lower Sixth and Upper Sixth resitting skills!

Here on Monday night there will be a live online Q and A for the skills exam. This is a very simple way for you to revise, all you do is come to this blog page, and type a questn and I will answer it for you!

The sessions have been runni really successfully in Geology, and they can be very useful to you. You do not need to create a ness account, or do anything particularly IT based, just turn up, ask your questions and then stay for as long as you want.

The session will run for around two hours, longer if there are lots of people, could you Be aware that your comments are published by me, so there may be a sho time delay, and when a question needs a longer answer, give me time to type it!

Upper Sixth! Revision Help

Hello Uppers!

AS the AS geography exam is next week, I'm aware that the blog and the workshops have been very much focused on the Lower Sixth topics, so here is a post just for you!

Nick has very kindly been through the textbook and come up with a list of subheadings that could easily be the focus of the short answer questions this summer. They are categorised by module, and would make an excellent format for you to make sure you have all the notes you need and case studies for each.

You should be, and should have been for some time, revising pretty hard by now. The exams have a nasty habit of creeping up on us very fast at this time of year, and they are now a month away. As you enter the final fortnight (Sob/Cry/Scream in delight at the idea of under two more weeks of lessons), you need to ensure you have everything you need from us before the half term break.

So, the subheadings:

Tectonics

The theory of plate tectonics

Features of plate margins

Hot Spots

Distribution of volcanoes

Volcanic eruptions

Intrusive and extrusive volcanic activity in the UK

The impact of volcanic eruptions

Causes of earthquakes

Distribution

Magnitude and frequency

The effects of earthquakes

Weather

Structure of the atmosphere

The atmospheric heat budget

Planetary surface winds

Atmospheric pressure and winds

The general atmospheric circulation system

British Isles - basic climatic characteristics

British Isles – Air masses affecting the….

The origin and nature of depressions

The origin and nature of anticyclones

Storm events

The ITCZ

Tropical Monsoon Climate

Tropical Revolving Storms

The urban heat island effect

Urban areas – precipitation, fog, air quality, winds

Evidence for climate change

Possible causes of climate change

Effects of global warming

Effects on monsoon climate

Effects on the UK

Responses to global warming

Development and Globalisation

Development

Globalisation

Global Marketing

Patterns of production, distribution and consumption

NICs

Growth in the 21^st Century

Countries at low levels of development

Quality of Life

Debt

Social problems

Global groupings

Social and economic groupings

Growth of the EU

TNCs - definitions

TNCs – growth and location

TNCs – globalisation

TNCs - Social, economic and environmental impacts

Trade vs Aid

Economic vs environmental sustainability

Sustainable tourism: myth or reality

Ecotourism

As ever with geography, the best answers have the following characteristics:

1. Terminology - we wouldn't teach it if you didn't need to know it, so use it. There is a dictionary on moodle that you can fill out with all the key words from all the modules this year.
2. Structure - Don't just write everything you know in a rush, take your time and answer questions properly, categorise your sentences and make sure you write in good English.
3. Case Studies - quite often, even if the question doesn't say "Using case studies analyse...." they are still expecting you to demonstrate knowledge of real world examples.  It can never hurt to "name drop" a few examples into the short answer questions.

The last point to remember, is that there are marks available for "Thinking like a geographer", this is exam board terminology, Nick, Nikki and I have all been at exam meetings with our Chief Examiner talking about how impressed he is when students demonstrate they understand the nature of the subject, how the syllabus links together, using unique and local examples etc.

What he is really trying to say, is that by this stage in your education you should realised that geography is everywhere, and concerns pretty much everything. Therefore you can talk about anything you have learned, not just in this subject and your other AS modules, but your other subjects too. What have you read in the news? What is important to you that you understand and can relate to geography? Use examples, use your brains and look at the subject as a whole.

That may all sound a bit wishy washy and all-encompassing coming from a possibly slight over enthused teacher, so to make it clear, lets define what geography is:

• The bridge between the human and physical sciences?
• The science of dealing with the earth, its lands, features, inhabitants and phenomena
• Spatial analysis of natural and human phenomena
• Understanding the earth and everything that takes place on it or in it
• How has the earth changed and developed and come to be as it is today?
• A world discipline?

In reality, for the numpty like me, Geography is the study of people and place, and how the two interact. It is studying how we are affected by and affect the planet.

So, set yourselves up with a list of revision topics, the case studies and the revision booklets. Traffic light topics, make new notes, believe me this really helps, and come to workshops. We are currently finalising a post half term structured week of revision, designed as last minute help, with a day on each topic and a session on exam technique for short and long answers.

Hope this helps, if you have any particular requests for assistance with Upper sixth revision, leave them here as a comment and i will try to make it happen!

Millie

PS - As of next week, all Upper sixth classes are open to all upper sixth students, there are columns in 1, 2, 3, 4, and 7, please feel free to come along if you want to.