Feeds:
Færslur
Athugasemdir

Posts Tagged ‘Melting ice’

IMG_2200

Here is one of those recordings that I record without being directly aware of what will come out of it. Equipment is placed in a suitable location where the wind was minimal and left there for 30-40 minutes while taking a walk. So I really don’t know what is being recorded until much later when you have time to listen and process the recording.
In fact, I knew of a rockfall at this location and was rather afraid about leaving the equipment behind, because the ice cave that the recording equipment was in might as well collapse. Then there would be a mud and rock slide from the mountain slope that would submerge everything.
This ice cave was at the end of Breiðamerkurjökull icefall, in a place where the glacier was probably 300 meters thicker only 40 years ago when I first came to this part of Iceland. Now the glacier is not more than dirty, „dead“ ice. A lot of it is buried under sand and rocks.
For centuries, the glacier has scraped the slopes of the mountains in Suðursveit. When the glacier retreated, gravel and rocks fell from the mountain slopes on the glacier below, which then formed a thick insulating layer over the ice closest to the mountain slopes. Under normal circumstances for centuries, the advance of the glacier would have carried this gravel down to the glacier toe. But the glacier has for two decades stopped advancing in this place. The glacier has lost all its mass so it will not crawl anymore in this place. The glacier lies flat and dirty towards the sun in the south, thin and melts rapidly. However, the ice that is covered with gravel and rocks melts much more slowly. Therefore, e.g. still possible to see ice high up on the mountain slope of Vestur Miðfell, although it is probably 30-40 years since the glacier was there and reach so high in the mountain slope
The pleasant surprise of this recording was that the wind did not interfere with the recording. You can hear mudslides sliding down the ice-covered mountain slope with all kinds of sounds that sometimes remind of car traffic. Sharp clicks in the rock as it bounces all around the mic and in good headphones you can hear the rock bouncing over the mic.
You will hear people speaking in the distance, which was several hikers coming from the glacier.
You might hear a lot of „white noise“ in this recording but it is mainly coming from nearby rivers, the wind and rapidly melting glaciers which are usually astonishingly noisy when they melt fast .
Quality open headphones are recommended while listening at medium to high volume.
But be careful. This recording has a high dynamic range and can damage both speakers and your hearing if it is played too high.

(mp3 256kbps /62Mb)

Recorder: Sound devices MixPre6
Mics: Sennheiser MKH8020/8040. (2x2ch Baffled AB35)
Pic. Samsung S22

Location: 64.134056, -16.226150
Weather: cloudy, dry, up to 8 m/sec, 7°C,

Read Full Post »

IMG_2200

Jökulsárlón is a fascinating glacial lagoon. It is about 300m deep below the glacier tongue and from Kayak I have measured with sonar a spot which was more than 280m deep. It is deeper than many places far away in the Atlantic ocean. So if something happens in this lagoon, like Iceberg calving, the sound will echo in this huge space down there as in a large dome.
It has been almost eight years since I recorded the sound in Jökulsárlón for the first time. I was both surprised and disappointed. The sound was much richer than I thought and because of this loud and rich sound down there it was clear I could not get a detailed sound of it when an Iceberg was scratching the bottom of the lake, or calving glacier.
The most common sound there is a loud „spark sound“ when highly pressed air bubbles break out of the ice, but also when dripping water falls on the surface from the melting ice above. Sometimes the iceberg moves and scratches the gravel in the bottom of the lagoon.
The following recording is made from a Kayak, where the lagoon is 40-80 meters deep and not far away, about 200-400m, from the place I did the recording 8 years ago.
You will hear a buzzing engine noise from sightseeing boats in this recording which has sadly increased in the past decade on the lagoon. Because of increasing tourist traffic this lagoon has almost constant engine noise pollution, both above and under the surface between 9-19 o´clock every day mainly during the summer time.
It is anyway interesting to use the engine noise to get insight into how loud the natural soundscape is in this lagoon. If there were NO ice surrounded by salty seawater, then engine noise would have been echoing loudly in the space below the surface, just as an noisy moped gang was driving inside Pantheon in Rome.

(mp3 256kbps / 63Mb)

Recorder: Sound devices MixPre6
Mics: Benthowave Bll-7121 hydrophones  1,8meters apart.
Pix: Canon EOS R

Location: 64.048029, -16.192690
Weather: Calm to breeze. cloudy around 13 °C
Recording date: 25th of June 2021

Read Full Post »

IMG_2200

I was shocked last summer. Then I realized it was becoming increasingly difficult to get interesting recordings of glaciers. I was missing out on unique opportunities if I would not change my traditional methods of recording glacier sounds.
Glaciers that have so far been accessible with all kind of sound seems much quieter than before. Finding good places seems to be more difficult each year and to reach them with all of my equipment are getting even more difficult. Many glacier toes in Iceland seem to be turning into „dead ice“ at the toe end so they will not be crawling under its own weight anymore just lay where they are until they melt down.
One of this glacier which has gotten thinner, smaller and quieter each year is Svínafellsjökull glacier.
I spent three nights recording there last summer without recording anything „interesting“
The temperature varies between 2°C over the night, to 18°C during the day. During the night it melted little but it started to melt intensely at dawn and became very intense during the day, especially when the sun was shining on the glacier.
The following recording was made in a small „Ice cave“ in the glacier toe, 27th of May 2019. The time was around 8 AM, about an hour after the heat started to rice and the melting began. In this 27 minutes long recording  you will clearly hear the melting of the ice increase until I became afraid about the microphone and I stop the recording.
You can hear several times a deep rumble sound, probably because the glacier is crawling high in the mountain. Many other strange sounds are in this recording, some are known, while other unexplainable. I was never close by so it is not sound from me.  Some of them are loud, so be careful, do not listen to the recording on high level.
Other sound in distance are tourists, almost constant motorist traffic. But fossil fuel machines and humans mobility are sadly one of the reason for rapidly shrinking glaciers now a days.
Quality open headphones are recommended while listening at low to mid level, or in speakers at low-mid level.
If you are having problems playing this or other recordings on this blog, try to open each blog-post in separate new frame or tab.

(mp3 256kbps / 51Mb)
If the media player doesn’t start to play, please reload this individual blog in new tab or frame

Recorder: Sound Devices MixPre6
Mics: Sennheiser MKH8020/8040 in Parallel AB40
Pix: LG G6
Location: 63.996493, -16.874061
Weather: Calm, light clouds, around 10°C

Read Full Post »