STSE Cryo Sat Cryosphere Regional glacial isostatic adjustment

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STSE: Cryo. Sat + Cryosphere Regional glacial isostatic adjustment and Cryo. Sat elevation rate

STSE: Cryo. Sat + Cryosphere Regional glacial isostatic adjustment and Cryo. Sat elevation rate corrections in Antarctica (REGINA) – Supplementary Study Contract-Nr. : 4000107393/12/I-NB REGINA Status Update 22 May 2015 REGINA status update, 21 May 2015 Page 1

Outline • Characteristic of new data sets (altimetry & GPS) • 1 st order

Outline • Characteristic of new data sets (altimetry & GPS) • 1 st order GIA estimate (difference phase 1 and 2) • Impact of altimetry on GIA estimate REGINA status update, 21 May 2015 Page 2

Altimetry annual rates REGINA status update, 21 May 2015 Page 3

Altimetry annual rates REGINA status update, 21 May 2015 Page 3

Cluster analysis of GPS Raw data shown here → Symbol area inversely proportional to

Cluster analysis of GPS Raw data shown here → Symbol area inversely proportional to error. Discrepant sites in a region are often lower quality. Weighted average of nearby sites will be minimally affected by low-quality data. REGINA status update, 21 May 2015 Page 4

Clustered GPS data Iterative clustering of sites up to 200 km separation. No threshold

Clustered GPS data Iterative clustering of sites up to 200 km separation. No threshold for velocity diff. Weighted mean of velocities, simple mean of site coords in each cluster. Far fewer regional discrepancies. REGINA status update, 21 May 2015 Page 5

GIA estimate (du/dt) 2003 -2009 2003 -2013 REGINA status update, 21 May 2015 Page

GIA estimate (du/dt) 2003 -2009 2003 -2013 REGINA status update, 21 May 2015 Page 6

GIA estimate (de/dt) 2003 -2009 REGINA status update, 21 May 2015 2003 -2013 Page

GIA estimate (de/dt) 2003 -2009 REGINA status update, 21 May 2015 2003 -2013 Page 7

Comparison: Phase 1 and Phase 2 2003 -2009 Altimetry Phase 1 GRACE Phase 2

Comparison: Phase 1 and Phase 2 2003 -2009 Altimetry Phase 1 GRACE Phase 2 REGINA status update, 21 May 2015 Page 8

dh/dt Amundsen Sea Embayment (ASE) 2003 -2009 Phase 1 2003 -2013 Phase 2 REGINA

dh/dt Amundsen Sea Embayment (ASE) 2003 -2009 Phase 1 2003 -2013 Phase 2 REGINA status update, 21 May 2015 Phase 2 Page 9

Comparison: Phase 1 and Phase 2 1 st order GIA estimate: “GRACE minus altimetry”

Comparison: Phase 1 and Phase 2 1 st order GIA estimate: “GRACE minus altimetry” 2003 -2009 Uniform errors of annual rates Uniform density: 910 kg/m³ REGINA status update, 21 May 2015 Page 10

Comparison: Phase 1 and Phase 2 1 st order GIA estimate: “GRACE minus altimetry”

Comparison: Phase 1 and Phase 2 1 st order GIA estimate: “GRACE minus altimetry” 2003 -2009 Non-uniform errors of dh/dt annual rates Uniform density: 910 kg/m³ REGINA status update, 21 May 2015 Page 11

Comparison: Phase 1 and Phase 2 1 st order GIA estimate: “GRACE minus altimetry”

Comparison: Phase 1 and Phase 2 1 st order GIA estimate: “GRACE minus altimetry” 2003 -2009 Uniform errors of dh/dt annual rates Firn & density model applied REGINA status update, 21 May 2015 Page 12

Comparison: Phase 1 and Phase 2 1 st order GIA estimate: “GRACE minus altimetry”

Comparison: Phase 1 and Phase 2 1 st order GIA estimate: “GRACE minus altimetry” 2003 -2013 Uniform errors of dh/dt annual rates Firn & density model applied REGINA status update, 21 May 2015 Page 13

Fully coupled 3 D simulation Ice model: Pollard & De. Conto (2009) REGINA status

Fully coupled 3 D simulation Ice model: Pollard & De. Conto (2009) REGINA status update, 21 May 2015 Page 14

Discussion Where do dh/dt differences come from? How can density model for Amundsen Sea

Discussion Where do dh/dt differences come from? How can density model for Amundsen Sea Embayment be improved? What could be best way to constrain GIA estimate: • Introduction of a priori constraint on GIA / past loading • Force smoothness of recovered field? • A posteriori limitation of spectral range? Should 2010 -2013 be included (CS 2)? REGINA status update, 21 May 2015 Page 15

STSE Cryo Sat Cryosphere Study Regional glacial isostaticSTSE Cryo Sat Cryosphere Study Regional glacial isostatic
STSE Cryo Sat Cryosphere Study Regional glacial isostaticSTSE Cryo Sat Cryosphere Study Regional glacial isostatic
ISOSTATIC PRESSING ISOSTATIC PRESSING COLD ISOSTATIC PRESSING CIPISOSTATIC PRESSING ISOSTATIC PRESSING COLD ISOSTATIC PRESSING CIP
GLACIAL AND POST GLACIAL HISTORY ICE LAKES ISOSTATICGLACIAL AND POST GLACIAL HISTORY ICE LAKES ISOSTATIC
Erosive Forces Review Glacial Movement Glacial Erosion GlacialErosive Forces Review Glacial Movement Glacial Erosion Glacial
Erosive Forces Review Glacial Movement Glacial Erosion GlacialErosive Forces Review Glacial Movement Glacial Erosion Glacial
Sat Sreci Sat Sreci Sat lemi ncesi SatSat Sreci Sat Sreci Sat lemi ncesi Sat
Global Cryosphere Watch GCW Tropical Cryosphere Workshop MoroccoGlobal Cryosphere Watch GCW Tropical Cryosphere Workshop Morocco
WMO GLOBAL CRYOSPHERE WATCH The Global Cryosphere WatchWMO GLOBAL CRYOSPHERE WATCH The Global Cryosphere Watch
CULTURAL ADJUSTMENT CULTURAL ADJUSTMENT CULTURE SHOCK ADJUSTMENT PROCESSCULTURAL ADJUSTMENT CULTURAL ADJUSTMENT CULTURE SHOCK ADJUSTMENT PROCESS
PERSONAL AND SOCIAL ADJUSTMENT ADJUSTMENT Adjustment means thePERSONAL AND SOCIAL ADJUSTMENT ADJUSTMENT Adjustment means the
CULTURAL ADJUSTMENT CULTURAL ADJUSTMENT CULTURE SHOCK ADJUSTMENT PROCESSCULTURAL ADJUSTMENT CULTURAL ADJUSTMENT CULTURE SHOCK ADJUSTMENT PROCESS
The Global Cryosphere Watch Cryo Net Asia 1The Global Cryosphere Watch Cryo Net Asia 1
The Global Cryosphere Watch Cryo Net Asia 1The Global Cryosphere Watch Cryo Net Asia 1