Decreasing surface albedo signifies a growing importance of clouds for Greenland Ice Sheet meltwater production.

Ryan, J C; Smith, L C; Cooley, S W; Pearson, B; Wever, N; Keenan, E; Lenaerts, J T M

Decreasing surface albedo signifies a growing importance of clouds for Greenland Ice Sheet meltwater production.

Ryan, J C; Smith, L C; Cooley, S W; Pearson, B; Wever, N; Keenan, E; Lenaerts, J T M.

Afiliación

Ryan JC; Department of Geography, University of Oregon, Eugene, OR, USA. jryan4@uoregon.edu.
Smith LC; Institute at Brown for Environment and Society, Brown University, Providence, RI, USA.
Cooley SW; Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI, USA.
Pearson B; Department of Geography, University of Oregon, Eugene, OR, USA.
Wever N; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA.
Keenan E; Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, USA.
Lenaerts JTM; Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, USA.

Nat Commun ; 13(1): 4205, 2022 Jul 21.

Article en En | MEDLINE | ID: mdl-35864084

RESUMEN

Clouds regulate the Greenland Ice Sheet's surface energy balance through the competing effects of shortwave radiation shading and longwave radiation trapping. However, the relative importance of these effects within Greenland's narrow ablation zone, where nearly all meltwater runoff is produced, remains poorly quantified. Here we use machine learning to merge MODIS, CloudSat, and CALIPSO satellite observations to produce a high-resolution cloud radiative effect product. For the period 2003-2020, we find that a 1% change in cloudiness has little effect (±0.16 W m-2) on summer net radiative fluxes in the ablation zone because the warming and cooling effects of clouds compensate. However, by 2100 (SSP5-8.5 scenario), radiative fluxes in the ablation zone will become more than twice as sensitive (±0.39 W m-2) to changes in cloudiness due to reduced surface albedo. Accurate representation of clouds will therefore become increasingly important for forecasting the Greenland Ice Sheet's contribution to global sea-level rise.

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido

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