World Glacier Monitoring Service, University of Zurich, Switzerland

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Presentation transcript:

World Glacier Monitoring Service, University of Zurich, Switzerland TOPC XVIII, Boulder CO, USA, 25 April 2016 The new GCOS Implementation Plan Update or Review? Some thoughts from the glacier example Michael Zemp World Glacier Monitoring Service, University of Zurich, Switzerland

ECV GLACIER: key observation parameters 1862 2010 Visualization by P. Rastner How much glacier ice is out there? How (fast) do glaciers change?

ECV GLACIER: key observation parameters How much glacier ice is out there? How (fast) do glaciers change? Can be described as: Number of glaciers Length Surface area Volume Mass Supplemented by hypsometry, ice velocities, ice temperatures, debris cover, surge dynamics, calving dynamics, ice shelves, etc. Can be described as changes in: Number of glaciers Length Surface area Volume Mass

ECV GLACIER: key observation parameters How much glacier ice is out there? How (fast) do glaciers change? Can be described as: Number of glaciers Length Surface area Volume Mass Can be described as.. CHANGES in: Number of glaciers Length Surface area Volume Mass What are the definitions for key observation parameters of GCOS IP? Ideal world? Observational feasibility from satellites? ...from in-situ? Including modelling results?

ECV GLACIER: key observation parameters GCOS IP Satellite Supplement, Update 2011 (GCOS-154) How much glacier ice is out there? How (fast) do glaciers change? By the way: What are the definitions for target requirements? Context information is important => e.g. temporal resolution!

Consistency between ECVs? glaciers versus ice sheets GCOS-154 - GLACIERS GCOS-154 – ICE SHEETS Different key observations, different target requirements, but also issues with glacier- ice sheet separation, ice shelves, …

The new GCOS Implementation Plan: Update or Review? UPDATE: update target requirement of observation parameters as described in GCOS-154 (e.g. based on new satellites) REVIEW: Criteria for observation parameters Target requirements Inter-ECV consistencies

Bojinski et al. (2014), BAMS

GCOS 107: Satellite Supplement to GCOS Implementation Plan 2006

GCOS 107: Satellite Supplement to GCOS Implementation Plan 2006

IGOS Cryosphere Theme Report 2007

GCOS 138: GCOS Implementation Plan 2010

GCOS 154: Satellite Supplement to GCOS Implementation Plan 2011 Update

GCOS 154: Satellite Supplement to GCOS Implementation Plan 2011 Update GCOS-154 - GLACIERS GCOS-154 – ICE SHEETS

GCOS XXX: GCOS Implementation Plan 2016 Domain Terrestrial, Cryosphere ECV Glaciers ECV Products (1) Glacier Area: surface area (km2) from 2D vector outlines of glaciers (delineating glacier surface area) typically derived from optical remote sensing data, supplemented by digital elevation models for drainage divides and topographic parameters and by ice velocity fields for drainage divides and delineation of debris covered glacier parts (2) Glacier Elevation Change: mean glacier-wide elevation change (m a-1), typically derived from decadal geodetic surveys, supplemented by digital elevation outlines (3) Glacier Mass Change: mean glacier-wide surface mass balance (kg a-1), typically derived from glacier-wide interpolation of in-situ measurements (i.e. ablation stakes, snow pits and related density measurements/assumptions) with seasonal to annual time resolution (Gegen-)Vorschlag Frank: Glacier Area Glacier Elevation Glacier Surface Flow Velocity Glacier Mass Change (in-situ)