Assessment of Lead Discrimination from CryoSat-2

Stine Kildegaard Rose, L. N. Connor, T. Newman, S. L. Farrell, W. H. Smith, René Forsberg

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    Abstract

    Sea ice is strongly affecting the global climate, and the sea ice extent has been monitored by satellites since 1979. To estimate the Arctic sea ice volume, ice thickness must be determined. The measurements of sea ice thickness are however more difficult to achieve, and encounter limitations due to spatial and temporal variability. The measurements of sea ice freeboard may be used to estimate sea ice thickness, when combined with examination of leads between ice floes to determine the local sea surface height. With CryoSat-2 (CS), we have the opportunity to measure much more of the Arctic Ocean due to its high sampling rate and geographical coverage to 88 oN/S. Validation of the CS retrievals are very important to verify the derived sea ice thickness and understand the associated error sources. We present a comparative analysis of CryoSat-2 elevations with the Operation IceBridge Airborne Topographic Mapper (ATM) laser altimeter data gathered on April 2, 2012, where the NASA P-3 completed an underflight of CS orbit number 10520, north of Alert, Nunavut, Canada. We present a new lead detecting algorithm which was developed using the CS Level1b (L1b) waveforms, and we analyze its capabilities via comparisons with IceBridge imagery and ATM elevations. In addition,using CS L1b waveforms we have developed a method to find misplaced CS Level 2 elevations and correct them to remove any elevation bias.
    Original languageEnglish
    Publication date2012
    Number of pages1
    Publication statusPublished - 2012
    Event2012 AGU Fall Meeting - San Francisco, United States
    Duration: 3 Dec 20127 Dec 2012
    Conference number: 45
    http://fallmeeting.agu.org/2012/

    Conference

    Conference2012 AGU Fall Meeting
    Number45
    Country/TerritoryUnited States
    CitySan Francisco
    Period03/12/201207/12/2012
    Internet address

    Bibliographical note

    C51A-0763

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