Glacier Modeling Lab presentations at AGU 2021

December 8, 2021Uncategorizedkpoinar

Jessica Mejia
- Talk 1, Spatial and Temporal Lags in Meltwater Propagation Through the Greenland Ice Sheet Hydraulic System
- Talk 2, Best practices for building a more inclusive glaciology through cryocommunity.org (Invited)
  - View the CryoCommunity talk on YouTube
Donglai Yang: Numerical Modeling of Frictional Melting Dynamics Constrained by Surface Micro-Roughness
Courtney Shafer: Comparing the Shallow-Shelf and L1L2 Approximations using BISICLES in the Context of MISMIP+ with Buttressing Effects
Kristin Poinar: Are the Sermilik Fjord glaciers terminus-controlled, runoff-controlled, or runoff-adapting? Decomposition of glacier speed maps at Helheim, Fenris, Midgard, and Pourquoi-Pas Glaciers, 2006-2019
- Link to eLightning poster

https://res.cloudinary.com/amuze-interactive/image/upload/f_auto,q_auto/v1638741830/agu-fm2021/84-88-ab-27-6b-d5-88-4b-58-2a-a9-93-fc-ba-27-2c/image/helheim_als_scalebymag_trendrm_23_minfrac0.90_pceof1_15-oct-2013-15-may-2021_05-dec-2021_qz9uqy.jpg — Figure from Kristin’s eLightning poster about Helheim Glacier and other glaciers feeding Sermilik Fjord. The leading principal component (blue data on bottom panel) correlates with both the terminus position (p=0.003, red data) and a seasonal cycle with maximum in mid-July (p=0.05, blue dashed line) that is consistent with runoff-control. The terminus position itself correlates to this annual cycle (R=-0.11, p=0.1). Examining p-values and considering some commonality of the forcings, we classify Helheim Glacier as terminus-controlled over 2014-2021.

This agrees with previous classifications of Helheim Glacier as usually terminus-controlled (2009, 2010, 2015, 2016, 2017) [1,2,3] and sometimes runoff-controlled (2013) [1]. It agrees less with a study that found Helheim was runoff-controlled over 2009-2017 [7].

Map of Sermilik Fjord study area — Figure from Kristin’s eLightning poster. Sermilik Fjord, eastern Greenland, contains four major outlet glaciers. Helheim Glacier (westernmost) is the largest. The base map is a mosaic of Sentinel-2 images from summer 2019, by MacGregor et al. (2020). The wintertime terminus positions are from PROMICE.

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