Modeling the surface mass-balance response of the Laurentide Ice Sheet to Bolling warming and its contribution to Meltwater Pulse 1A

Anders E. Carlson, David J. Ullman, Faron S. Anslow, Feng He, Peter U Clark, Zhengyu Liu, Bette L. Otto-Bliesner

    Research output: Contribution to journalArticle

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    Abstract

    Meltwater Pulse (MWP) 1A occurred ~ 14.5–14 ka and is the largest abrupt rise in sea level (10–20 m of sea-level rise) of the last deglaciation. The timing of MWP-1A is coincident with or shortly follows the abrupt warming of the North Atlantic region into the Bølling warm period, which could have triggered a large Laurentide Ice Sheet (LIS) contribution to MWP-1A. Given that outside of the Arctic, LIS iceberg discharge probably did not increase during the Bølling, much of the LIS MWP-1A contribution likely occurred through surface ablation. Here we test the response of LIS surface mass-balance to Bølling warming by forcing a LIS energy–mass balance model with climate from an atmosphere–ocean general circulation model. Our modeling approach neglects changes in LIS mass from dynamics and iceberg calving, allowing us to isolate the surface mass balance response. Model results suggest that LIS surface ablation can explain much of the sea-level rise just prior to MWP-1A. LIS surface mass-balance becomes more negative in response to the Bølling warming, contributing an additional 2.9 ± 1.0 m of sea-level rise in 500 yr in addition to the background contribution of 4.0 ± 0.8 m. The modeled LIS MWP-1A contribution is less than previous assumptions but agrees with geochemical runoff and LIS area-volume estimates. The fraction of MWP-1A attributable to other ice sheets, particularly Antarctica, depends on the total sea-level rise that occurred during this MWP.
    LanguageEnglish
    Pages24-29
    JournalEarth and Planetary Science Letters
    Volume315
    Issue numberSI
    DOIs
    Publication statusPublished - Jan 2012

    Fingerprint

    Bolling
    Laurentide Ice Sheet
    meltwater
    mass balance
    warming
    modeling
    ablation
    iceberg calving
    last deglaciation
    iceberg
    ice sheet
    general circulation model
    sea level

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    Carlson, Anders E. ; Ullman, David J. ; Anslow, Faron S. ; He, Feng ; Clark, Peter U ; Liu, Zhengyu ; Otto-Bliesner, Bette L. / Modeling the surface mass-balance response of the Laurentide Ice Sheet to Bolling warming and its contribution to Meltwater Pulse 1A. In: Earth and Planetary Science Letters. 2012 ; Vol. 315, No. SI. pp. 24-29.
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    abstract = "Meltwater Pulse (MWP) 1A occurred ~ 14.5–14 ka and is the largest abrupt rise in sea level (10–20 m of sea-level rise) of the last deglaciation. The timing of MWP-1A is coincident with or shortly follows the abrupt warming of the North Atlantic region into the B{\o}lling warm period, which could have triggered a large Laurentide Ice Sheet (LIS) contribution to MWP-1A. Given that outside of the Arctic, LIS iceberg discharge probably did not increase during the B{\o}lling, much of the LIS MWP-1A contribution likely occurred through surface ablation. Here we test the response of LIS surface mass-balance to B{\o}lling warming by forcing a LIS energy–mass balance model with climate from an atmosphere–ocean general circulation model. Our modeling approach neglects changes in LIS mass from dynamics and iceberg calving, allowing us to isolate the surface mass balance response. Model results suggest that LIS surface ablation can explain much of the sea-level rise just prior to MWP-1A. LIS surface mass-balance becomes more negative in response to the B{\o}lling warming, contributing an additional 2.9 ± 1.0 m of sea-level rise in 500 yr in addition to the background contribution of 4.0 ± 0.8 m. The modeled LIS MWP-1A contribution is less than previous assumptions but agrees with geochemical runoff and LIS area-volume estimates. The fraction of MWP-1A attributable to other ice sheets, particularly Antarctica, depends on the total sea-level rise that occurred during this MWP.",
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    Modeling the surface mass-balance response of the Laurentide Ice Sheet to Bolling warming and its contribution to Meltwater Pulse 1A. / Carlson, Anders E.; Ullman, David J.; Anslow, Faron S.; He, Feng; Clark, Peter U; Liu, Zhengyu; Otto-Bliesner, Bette L.

    In: Earth and Planetary Science Letters, Vol. 315, No. SI, 01.2012, p. 24-29.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Modeling the surface mass-balance response of the Laurentide Ice Sheet to Bolling warming and its contribution to Meltwater Pulse 1A

    AU - Carlson, Anders E.

    AU - Ullman, David J.

    AU - Anslow, Faron S.

    AU - He, Feng

    AU - Clark, Peter U

    AU - Liu, Zhengyu

    AU - Otto-Bliesner, Bette L.

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    N2 - Meltwater Pulse (MWP) 1A occurred ~ 14.5–14 ka and is the largest abrupt rise in sea level (10–20 m of sea-level rise) of the last deglaciation. The timing of MWP-1A is coincident with or shortly follows the abrupt warming of the North Atlantic region into the Bølling warm period, which could have triggered a large Laurentide Ice Sheet (LIS) contribution to MWP-1A. Given that outside of the Arctic, LIS iceberg discharge probably did not increase during the Bølling, much of the LIS MWP-1A contribution likely occurred through surface ablation. Here we test the response of LIS surface mass-balance to Bølling warming by forcing a LIS energy–mass balance model with climate from an atmosphere–ocean general circulation model. Our modeling approach neglects changes in LIS mass from dynamics and iceberg calving, allowing us to isolate the surface mass balance response. Model results suggest that LIS surface ablation can explain much of the sea-level rise just prior to MWP-1A. LIS surface mass-balance becomes more negative in response to the Bølling warming, contributing an additional 2.9 ± 1.0 m of sea-level rise in 500 yr in addition to the background contribution of 4.0 ± 0.8 m. The modeled LIS MWP-1A contribution is less than previous assumptions but agrees with geochemical runoff and LIS area-volume estimates. The fraction of MWP-1A attributable to other ice sheets, particularly Antarctica, depends on the total sea-level rise that occurred during this MWP.

    AB - Meltwater Pulse (MWP) 1A occurred ~ 14.5–14 ka and is the largest abrupt rise in sea level (10–20 m of sea-level rise) of the last deglaciation. The timing of MWP-1A is coincident with or shortly follows the abrupt warming of the North Atlantic region into the Bølling warm period, which could have triggered a large Laurentide Ice Sheet (LIS) contribution to MWP-1A. Given that outside of the Arctic, LIS iceberg discharge probably did not increase during the Bølling, much of the LIS MWP-1A contribution likely occurred through surface ablation. Here we test the response of LIS surface mass-balance to Bølling warming by forcing a LIS energy–mass balance model with climate from an atmosphere–ocean general circulation model. Our modeling approach neglects changes in LIS mass from dynamics and iceberg calving, allowing us to isolate the surface mass balance response. Model results suggest that LIS surface ablation can explain much of the sea-level rise just prior to MWP-1A. LIS surface mass-balance becomes more negative in response to the Bølling warming, contributing an additional 2.9 ± 1.0 m of sea-level rise in 500 yr in addition to the background contribution of 4.0 ± 0.8 m. The modeled LIS MWP-1A contribution is less than previous assumptions but agrees with geochemical runoff and LIS area-volume estimates. The fraction of MWP-1A attributable to other ice sheets, particularly Antarctica, depends on the total sea-level rise that occurred during this MWP.

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    T2 - Earth and Planetary Science Letters

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