melting trends over the greenland ice sheet (1958-2009) from spaceborne microwave data and regional...
TRANSCRIPT
Melting trends over the Melting trends over the Greenland ice sheet (1958-Greenland ice sheet (1958-
2009) from spaceborne 2009) from spaceborne microwave data and regional microwave data and regional
climate modelsclimate models
Kelsey SimmonsKelsey SimmonsAtmospheric Science MajorAtmospheric Science Major
Published May 5, 2011
By X. Fettweis, M. Tedesco, M. van den Broeke, and J. Ettema
AuthorsAuthors
Dr. Xavier FettweisDr. Xavier Fettweis
University of Liege, BelgiumUniversity of Liege, Belgium
Email: Email: [email protected]@ulg.ac.be
Dr. Marco TedescoDr. Marco Tedesco
The City College, New York, The City College, New York, NYNY
Email: Email: [email protected]@sci.ccny.cuny.edudu
Authors Authors
Dr. Michiel R. van den BroekeDr. Michiel R. van den Broeke
Utrecht University, The Utrecht University, The NetherlandsNetherlands
Email: Email: [email protected]@uu.nl
Dr. Janneke EttemaDr. Janneke Ettema
University of Twente, The University of Twente, The NetherlandsNetherlands
Email: Email: [email protected]@itc.nl
OverviewOverview
DataData
Biases and LimitationsBiases and Limitations
ResultsResults
What does it What does it mean/Why does this mean/Why does this matter?matter?
Collecting DataCollecting Data
Models:RACMO2 Models:RACMO2 and MARand MAR
InstrumentsInstruments
Algorithms Algorithms
Automated Weather Station (AWS) used for the Greenland Climate Network. (GC-Net)
Algorithms Algorithms Methods for detecting wet snow
•T19H K-band horizontal polarized brightness temperature
•T19Hthsd Threshold value of T19H
•T37V K-band vertical polarized brightness temperature
• XPGR Cross-polarized gradient ratio
CP1CP1
DYEDYE
ETH-CampETH-Camp
Jar1Jar1
Melting analysisMelting analysis
Time periodTime period
Years with lower Years with lower snow melting vs. snow melting vs. years with higher years with higher snow meltingsnow melting
Regions with >100 Regions with >100 days of meltingdays of melting
Difference between Difference between models and models and satellite datasatellite data
Limitations in the Limitations in the AlgorithmsAlgorithms
T19Hmelt ExtXPGR XPGR MARRACMO2
Biases in ModelsBiases in Models
Melting areas Melting areas absent in one but absent in one but not the othernot the other
Bare ice at the Bare ice at the surfacesurface
Summer snowfallSummer snowfall
Results and ErrorsResults and Errors
Significant positive Significant positive trendtrend
Years of Max and Years of Max and Min Min
Periods of highs Periods of highs and lowsand lows
Response time to Response time to surface snow surface snow changeschanges
2-m temperature 2-m temperature vs surface vs surface temperaturetemperature
Minimum thickness Minimum thickness LWC sensitive LWC sensitive
algorithmsalgorithms
What does this mean and why What does this mean and why does it matter?does it matter?
Sea level riseSea level rise
Influence weather Influence weather patternspatterns
PaleoclimatologyPaleoclimatology
QUESTIONS?QUESTIONS?
Works CitedWorks Cited
Fettweis, Xavier, Marco Tedesco, Michiel Van Den Fettweis, Xavier, Marco Tedesco, Michiel Van Den Broeke, and Janneke Ettema. "Melting Trends Broeke, and Janneke Ettema. "Melting Trends over the Greenland Ice Sheet (1958–2009) from over the Greenland Ice Sheet (1958–2009) from Spaceborne Microwave Data and Regional Spaceborne Microwave Data and Regional Climate Models." Climate Models." TC - Abstract - Melting Trends TC - Abstract - Melting Trends over the Greenland Ice Sheet (1958–2009) from over the Greenland Ice Sheet (1958–2009) from Spaceborne Microwave Data and Regional Spaceborne Microwave Data and Regional Climate ModelsClimate Models. Copernicus Publications, 5 May . Copernicus Publications, 5 May 2011. Web. 15 Apr. 2015. 2011. Web. 15 Apr. 2015.
http://cires1.colorado.edu/steffen/gcnet/aws.htmlhttp://cires1.colorado.edu/steffen/gcnet/aws.html http://s.ngm.com/2013/09/rising-seas/gatefold/http://s.ngm.com/2013/09/rising-seas/gatefold/
RS_Web_NA_15M_v3.jpgRS_Web_NA_15M_v3.jpg