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Rates of Change on Spillway Lake Ngozumpa Glacier, Nepal Ulyana N. Horodyskyj University of Colorado Boulder July 14, 2013


Trail Map

•  Background •  The beginning: 2011 time-lapse of supraglacial ponds

•  2012/13 supraglacial ponds + Spillway Lake changes

•  Sherpa-Scientist Initiative •  Pilot project in Cordillera Blanca


Melting glaciers

Supraglacial lake formation

rising temperatures

central and eastern Himalaya greatly affected

due to lower angle (slopes) of glaciers

Loss of life and infrastructure

Increase in flood potential

Enhanced melting

Warming climate

1985 - Dig Tsho outburst ($1.5 million damages)

due to storage of water in lakes

due to exposure of bare ice walls

David Breashears, GlacierWorks


Snapshots of Change N

N N

Khumbu

Imja Ngozumpa


Ngozumpa Glacier, Nepal

BBC


Side View Ngozumpa Glacier Cho Oyu

18 km

BBC


1951


2009 - Breashears


Project Objectives 1. Use time-lapse photography from melt seasons to qualitatively and semi-quantitatively document lake changes. 2. Document terminal (spillway) lake area and depth changes, to determine growth rates through time. 3. Quantify some physics of lake deepening and expansion.


Back in 2011...


Time-Lapse Locations


2010 Dcam

Ucam

300 m


2012 Dcam Lake X

Ucam

300 m


November 2012: Investigating a Spillway Situation


#1 #2

#3


N

#1


#2


Everest Base Camp 2008 Spy Accusations

#3

N


Important Findings:  - Multiple drain/fill events occur throughout a melt season. - Satellites may mask this volume loss. 

- Drainages can occur even post-freeze. - End of melt season may not mean end of volume loss. 




Spillway Lake: Past and Present


Area Changes: 2001-2010

Thompson et al., 2012


Area Changes: 2010-2012

in progress


2010


2012

x

x

x

x


x


x

N


Depth 2010

Thompson et al., 2012


Depth 2012

in progress


Difference Map

in progress


Inflow

Inflow NW NE

Thermal Characteristics

MAIN

SW


Surface Temperatures


SW Stable Basin


Bottom Temperatures


Inflow influence?


Subaqueous calving?


Surprise Finding: Arsenic Low (< 9 ppb) Moderate (10-15 ppb) High (16-30 ppb) Very High (> 30 ppb)


November 2012 Training


May 2013 November 2012 Training


Cordillera Blanca

â&#x20AC;˘â&#x20AC;Ż Supraglacial pond comparisons, through the AAC Climber Science Program


Water Chemistry Morphological Changes


Back-wasting and  Down-wasting Rates


blackicehimalaya.wordpress.com www.glacierworks.org

Ulyana Horodyskyj: Rates of change on Spillway Lake, Ngozumpa Glacier, Nepal  

Slides for presentation given to High Mountains Adaptation Partnership in Huaraz, Peru on 13 July 2013.

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