NIWA Snow and Ice Network Information Available

NIWA have started publishing graphs of the snow depth at ten of it’s snow and ice network (SIN) weather stations.

This is a major development. The network was installed about 12 years ago but access to the snow-depth information has to-date been by request only.

The information is published as graph images at

The graphs don’t provide a scale on the snow-depth axes, but an average line on the graphs means it is possible to see how the current year’s snow depth is progressing in a relative way.

For reference average peak snow depth at Mueller is about 2.5 m, and at Mahanga and Mt Larkins it is about 70 cm.

2022 SIRG Workshop details and registration information

2022 SIRG Workshop postponed

UPDATE (25/01/2022): The 2022 SIRG workshop has been postponed due to the change to red settings under the national covid protection framework. The organising team is working on alternative arrangements and details will be posted here and to the SIRG mailing list in due course. Our aim is to hold an in-person meeting in winter (June/July) 2022. Please don’t hesitate to contact us at with any questions.

Key details

Where: Coronet Peak, Queenstown, New Zealand. Workshop sessions will be held in the Coronet Peak Ski Area base building, with accommodation available on site at the Otago Ski Club’s Joel Lodge. Coronet Peak is a 25 minute drive from Queenstown Airport. Note that there is no regular public transport to Coronet peak during summer months – if you require transport from the airport to Coronet Peak please let the organising team know and we will do our best to coordinate ride sharing.

When: February 17 – 19, 2022. Presentation sessions will run over the afternoon of February 17 and all day of February 18. The workshop will conclude with a field trip on Saturday February 19, more information about the field trip is available here.

Who: SIRG 2022 is open to all researchers with an interest in snow and ice. We particularly encourage students to attend and tell us all about their work!

What: We welcome presentations on all aspects of research related to the cryosphere, including but not limited to: seasonal snow, glaciology, glacial geomorphology and sea ice, in Aotearoa New Zealand, Antarctica, and further afield.

COVID-19 Protection Framework (traffic light system)

SIRG 2022 will operate as an event under the New Zealand COVID-19 Protection Framework, and we will require a valid My Vaccine Pass for attendance. We will check and verify attendee vaccine passes upon arrival. This means that SIRG 2022 can go ahead with minimal restrictions at all traffic light settings (a limit of 100 people and social distancing will apply at the red traffic light setting). For more information please see


Registration is now open, and closes on January 28, 2022. The registration page is accessible here. For 2022, registration fees are:

  • Non-student: $150
  • Student (presenting): $0
  • Student (non-presenting): $50

Registration fees include accommodation (for the nights of February 17 and 18), meals for the duration of the workshop and the field trip. We acknowledge the generous support of NIWA, Antarctica New Zealand and Coronet Peak which has allowed us to keep registration costs to a minimum.

Abstract preparation

Please prepare your abstract using the template available here. Abstracts must be submitted via email to by January 28, 2022.


Accommodation in the Otago Ski Club’s Joel Lodge, for the nights of February 17 and 18, is included in the cost of registration. This is shared bunk room style accommodation, so please bring a sleeping bag and pillow! There are several room configurations available, please indicate any preferences when registering and we will do our best to accommodate these. Please note that camping is not permitted on the Coronet Peak Recreation Reserve.

We are looking forward to seeing you in February 2022!

If you have any questions or require any further information in the meantime, please reach out to the organising team via email:

Hei konā mai

The 2022 SIRG organising team.

If an avalanche occurs in the mountains and there is no one to hear it, does it make a sound?

Yes it does. And that sound can be used to count, measure and map avalanches. Leighton Watson from the University of Oregon in the USA, with colleagues, has tested a system of using microphone arrays to detect and characterise avalanches falling on to the Milford Road. They installed two sets of “infrasound” sensors near the Homer Tunnel in September 2020. The very next day the Waka Kotahi’s Milford Road Alliance triggered seven large avalanches in the area by dropping explosives from helicopters onto the mountain snow pack. Leighton’s microphones clearly recorded the sound of the avalanches. In fact the sounds were stronger than had been recorded anywhere else in the world. Through cunning trigonometry of the arrival time of the sound at the different microphones, Leighton was able to track and map where the avalanches were occurring. His maps were validated by the observations of the Milford Road Alliance avalanche team. The microphones were left in place for a month and continued to collect avalanche sound data, including naturally occurring night time avalanches. In each case the avalanche location was mapped. Current avalanche risk assessment relies on incomplete avalanche occurrence data, as observation techniques rely on human observation of events or debris. This is problematic in remote regions or during low visibility in storms or at night. Leighton and his colleagues have demonstrated a new approach which could improve avalanche frequency knowledge and make our mountains safer.

Watson, L.M., Carpenter, B., Thompson, K., Johnson, J.B., 2021. Using local infrasound arrays to detect plunging snow avalanches along the Milford Road, New Zealand (Aotearoa). Nat Hazards.

A last view of the North Island glaciers

Possibly the most viewed glaciers in New Zealand are those on Mt Ruapehu. Everybody who drives, flies or takes a train past this largest of the North Island volcanoes cannot help but have their eye drawn to its ice clad summits. Its quite likely that many of us are unaware that what we are seeing are the last remnants of great ice bodies that have persisted for 50 thousand years.

To help explain the special case of Mt Ruapehu glaciers, Shaun Eaves and Martin Brook have published a comprehensive review of glaciers and glaciation of the North Island in the New Zealand Journal of Geology and Geophysics.

Fourteen glaciers grace the slopes of Mt Ruapehu and represent the last of the North Islands glaciation. In the past glaciers provided extensive cover over Mts Ruapehu and Tongariro, were probably on the slopes of Taranaki and some remote basins in the Tararua Ranges and perhaps on the tops of the Kaimanawa Ranges and a niche or two in the Ruahine Ranges.

The review highlights the unique volcanic location of the Ruapehu glaciers. The glacier’s inter-twining, sometimes literally, with the area’s volcanism provides valuable age markers to assist with glacier extent aging. No other glacierised region of New Zealand has this feature.

For all the great glacier-volcanic interaction, the review has come too late for the Whakapapa Glacier. The review describes how in the 1950s the glacier flowed 1.5 km from the edge of the mountain’s summit plateau down to the slopes of New Zealand’s largest ski field. Since then it has retreated, split into two and is now nothing but a snow patch that, in some summers, leaves nothing to see.

The demise of the Whakapapa glacier appears to be the first of many as the theme of retreat and thinning is common to nearly all the mountain’s glaciers. The review suggests that next few decades are predicted to be the last for most of the remaining 14 North Island glaciers.

It might be wise to take an extra look at the white capped mountain this summer when you next drive/fly/train past. It just may be your last chance before the end of the glacial life of the North Island.

We’ve lost 216 glaciers!

Sabine Baumann from the Technical University of Munich has just finished counting New Zealand’s glaciers and found that we are missing 216 of them. Sabine carefully counted every independent area of ice larger than 1 hectare, even those bits of ice hidden under rock.

In total 2918 glaciers were found, but in 1978 there had been 3134. It seems that 216 glaciers have melted away.

The total area of glacier has shrunk by 364 km2 , that is a about the size of Manakau Harbour.

Just 15 of the glaciers were in the North Island (all on Mt Ruapehu), three less than the 1978 count.

The new glacier inventory has been published in the Journal of Glaciology

The 1978 effort was undertaken by Trevor Chinn and was published in 2001 in the Journal of Hydrology (NZ).

2021 SIRG Meeting dates

Keep the 9th to 13th February free in your calendars.

For 2021 the New Zealand Snow and Ice Research Group will join with Antarctica New Zealand for a combined meeting in Christchurch at the University of Canterbury.

The current plan is to have the snow and ice themed presentations on Thursday the 11th and Friday the 12th of February.

There will also be a one day field trip at the end (Sat 13th) for those keen to explore glacier-climate in the Canterbury high-country.

The official meeting web page is being hosted by Antarctica NZ with a link to it from the SIRG web page

So keep those dates secured in your diaries, updates coming soon!

Listen to millennial-scale glaciation

Hamish Prince, a post-graduate student in the School of Geography at the University of Otago, has put together a musical interpretation of the ‘Millennial-scale pulsebeat of glaciation in the Southern Alps of New Zealand’ (Strand et al., 2019).

This lets you listen to the (asynchronous) relationship between cold periods in the Northern and Southern hemisphere over the last 50,000 years.

In a review of Strand et al., 2019, it was suggested that if North Atlantic cold periods were a jazz rhythm, New Zealand’s glaciers accent the back beat. To explore the potential ‘anti-phased timing’ Hamish created a drum beat using the timing of both events, ordered from oldest to most recent. The timing of Northern Hemisphere cold periods were standardized and used to define the bars in the music. The position of New Zealand glacier advances were then placed in the music relative to these. A four bar rhythm appeared from the data and from this Hamish wrote a short composition. This lets you listen to the (asynchronous) relationship between cold periods in the Northern and Southern hemisphere from the last 50,000 years.

Such link in the rhythm of the North Atlantic cold periods and the Lake Pukaki moraine dates suggest some sort of a connection between New Zealand and Northern Hemisphere glacial fluctuations over the last 50,000 years.

New Zealand glaciers play reggae.

If the jazz rhythm of cold climate is defined by North Atlantic iceberg activity, then New Zealand’s glaciers accent the back beat.
That is the finding of Peter Strand and collaborators as described in their recent paper in Quaternary Science Reviews.
The signature beat of Northern Hemisphere cold periods during the last glacial period (since about 90,000 years ago) are known as Heinrich events.
Hartmut Heinrich found layering of rock sediment on the bed of the Atlantic that wasn’t local. It had arrived by iceberg transport. Dating when each of these layers of foreign rocks were deposited provided a good indication of when the Northern Hemisphere was cold. Other efforts to date Northern Hemisphere cold periods aligned well to Heinrich’s rock layer dates, so his name has been associated with these cold Northern Hemisphere events.

When considering the current rapid change in global temperatures, it is not unreasonable to look to the past to see how temperature changes were manifest.
One point of interest is whether there is synchronisation of Northern and Southern Hemisphere temperatures.
The lines of rock on the hillsides above New Zealand’s Lake Pukaki represent past extents of a former glacier. Peter Strand and his colleagues found that each rock-line was deposited by the glacier at different times during the last glacial period.
If the Northern and Southern hemisphere temperatures were synchronised, then the dates of these moraines should align with the Heinrich events.
They don’t.
The dates of these moraines fall between the Heinrich events. It seems that when the Northern Hemisphere was cold, The Pukaki glacier was in retreat, and when the Northern Hemisphere was warm, the Pukaki glacier advanced to build these moraines.