Can the snowline be used as an indicator of the equilibrium-line and mass balance for glaciers in the outer tropics?
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Can the snowline be used as an indicator of the equilibrium-line and mass balance for glaciers in the outer tropics?

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Can the snowline be used as an indicator of the equilibrium-line and mass balance for glaciers in the outer tropics? Presentation Transcript

  • 1. Can the snowline be used as an indicator of the equilibrium-line and mass balance for glaciers in the outer tropics? Dr. Antoine Rabatel, Ing. E. Loarte, Dr. A. Soruco, Ing. J. Gomez August 28, 2009 Ph : B. Pouyaud Huaraz, 1 - 4 de julio 2013 Laboratorio Mixto Internacional GREAT – ICE Servicio de Observacion GLACIOCLIM
  • 2. Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 Context 2 / 18 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia “The World Glacier Inventory contains information for over 100,000 glaciers through out the world. Parameters within the inventory include: geographic location, area, length, orientation, elevation, and classification of morphological type and moraines.” World Glacier Inventory website
  • 3. Context 2 / 18 “The World Glacier Inventory contains information for over 100,000 glaciers through out the world. Parameters within the inventory include: geographic location, area, length, orientation, elevation, and classification of morphological type and moraines.” World Glacier Inventory website “Basic information on specific net balance, cumulative specific balance, accumulation area ratio and equilibrium line altitude is given for 111 glaciers.” GMBB #10, WGMS-Zurich, 2009 Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia
  • 4. Context 2 / 18 0.1 % of the glaciers are monitored at worldscale Limitation for the study of: - glacier sensitivity to climate/morphological parameters - glacier contribution to hydrological systems “The World Glacier Inventory contains information for over 100,000 glaciers through out the world. Parameters within the inventory include: geographic location, area, length, orientation, elevation, and classification of morphological type and moraines.” World Glacier Inventory website “Basic information on specific net balance, cumulative specific balance, accumulation area ratio and equilibrium line altitude is given for 111 glaciers.” GMBB #10, WGMS-Zurich, 2009 Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia
  • 5. Context 2 / 18 Remote-sensing is an efficient tool to realize the measurement of glaciological parameters at a regional scale 0.1 % of the glaciers are monitored at worldscale Limitation for the study of: - glacier sensitivity to climate/morphological parameters - glacier contribution to hydrological systems “The World Glacier Inventory contains information for over 100,000 glaciers through out the world. Parameters within the inventory include: geographic location, area, length, orientation, elevation, and classification of morphological type and moraines.” World Glacier Inventory website “Basic information on specific net balance, cumulative specific balance, accumulation area ratio and equilibrium line altitude is given for 111 glaciers.” GMBB #10, WGMS-Zurich, 2009 Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia
  • 6. 3 / 18 Background Equilibrium line, MB = 0 Acc > Ab Saint Sorlin Glacier (French Alps) For mid-latitude glaciers : end-of-summer snowline = equilibrium line Ab > Acc The snowline is easy to identify on optical satellite images Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia
  • 7. 4 / 18 Background Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia
  • 8. 4 / 18 Background Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia
  • 9. Background Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia BUT ! 5 / 18
  • 10. 5 / 18 Background Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia BUT !
  • 11. Validation of the method for the outer tropical Andes Tropical climate generates a sequence of accumulation and ablation processes all year round that differs from that of mid- latitude glaciers. 6 / 18 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 Outer tropical Andes (Peru – Bolivia)
  • 12. 7 / 18 Validation of the method for the outer tropical Andes Ph : B. Pouyaud Monthly mass balance measurements on the glacier tongue (5250 – 4850 m a.s.l.) ELAi for each year i Mass balance gradient Zongo Glacier (Bolivia, 16 S) Monitored since 1991 IRD-France and UMSA-Bolivia0 z b 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013
  • 13. 8 / 18 Validation of the method for the outer tropical Andes Ph : B. Pouyaud Monthly mass balance measurements on the glacier tongue (up to 4850 m a.s.l.) ELAi for each year i Mass balance gradient Artesonraju Glacier (Peru, 9 S) Monitored since 2000 UGRH - ANA z b 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013
  • 14. 9 / 18 Validation of the method for the outer tropical Andes 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 List of the used satellite images
  • 15. 10 / 18 Validation of the method for the outer tropical Andes 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 How to detect the snowline on satellite images? Test of different combinations of bands and band ratios applied on Landsat-5 image
  • 16. 11 / 18 Validation of the method for the outer tropical Andes 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 Comparison of the highest remote-sensed SLA for each year and the annual ELA
  • 17. 11 / 18 Validation of the method for the outer tropical Andes 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 Comparison of the highest remote-sensed SLA for each year and the annual ELA
  • 18. 12 / 18 Reconstruction of glacier surface mass balance from the SLA Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia
  • 19. 12 / 18 Reconstruction of glacier surface mass balance from the SLA z b SLASLAtb ieq )()( Snowline altitude for each year i of the study period, computed from satellite images Snowline altitude representative of a steady state of the glacier Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia
  • 20. 12 / 18 Mass balance gradient derived from field data, valid at a regional scalez b SLASLAtb ieq )()( Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia Reconstruction of glacier surface mass balance from the SLA
  • 21. 12 / 18 z b SLASLAtb ieq )()( n ieq zb B SLA n SLA 1 / 1 with: Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia Reconstruction of glacier surface mass balance from the SLA
  • 22. 12 / 18 Mean mass balance of the glacier over the study period computed by DEM difference z b SLASLAtb ieq )()( n ieq zb B SLA n SLA 1 / 1 with: Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 Reconstruction of glacier surface mass balance from the SLA 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia
  • 23. 13 / 18 11 glaciers where is available. Soruco et al., 2009 )0697(B 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 Reconstruction of glacier surface mass balance from the SLA
  • 24. 14 / 18 Zongo Glacier (Bolivia, 16 S) Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 Reconstruction of glacier surface mass balance from the SLA Comparison between mass balance derived from SLA measurements and field measurements 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia
  • 25. 15 / 18 Good consistency between the glaciers ENSO is the main forcing of the interannual variability El Niño La Niña 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 Reconstruction of glacier surface mass balance from the SLA
  • 26. Important difference: between -3.4 m w.e. and -21.3 m w.e. 16 / 18 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013 Reconstruction of glacier surface mass balance from the SLA
  • 27. 1) Context & background 2) Validation of the method for the outer tropical Andes 3) Application to the Cordillera Real - Bolivia Application to the Cordillera Real - Bolivia Morphological parameters are the main factors controlling the difference in volume loss between the studied glaciers circles = glaciers with a mean elavation > 5150 m a.s.l. triangles = glaciers with a mean elavation < 5150 m a.s.l. 17 / 18Dr. A. Rabatel, LMI Great Ice, 1-4 julio 2013
  • 28. Gracias! See also the poster by Ing. Edwin Loarte et al. for an application in the Cordillera Blanca Rabatel et al., 2005. J. of Glaciology, 51(175), 539-546 Rabatel et al., 2008. J. of Glaciology, 54(185), 307-314 Rabatel et al., 2012. J. of Glaciology, 58(212), 1027-1036 antoine.rabatel@ujf-grenoble.fr