Seasonal variability of ocean circulation near the Dotson Ice Shelf, Antarctica

Yang, Hee Won; Kim, Tae Wan; Dutrieux, Pierre; Wåhlin, Anna; Jenkins, Adrian; Ha, Ho Kyung; Kim, C S; Cho, Kyoung‐Ho; Park, T; Lee, S H; Cho, Y-K

doi:10.1038/s41467-022-28751-5

Cited by 14 publications

(24 citation statements)

References 61 publications

(88 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Adusumilli et al (2020) used a wide range of remotely sensed surface elevations to obtain basal melt rates at quarter-yearly resolution but at the cost of the spatial resolution. Dotson Ice Shelf did not show noticeable changes in basal melt over the study period, however, ocean observations from the Dotson ice shelf cavity do show variations on seasonal timescales of inflow of warm circumpolar deep water (Jenkins et al, 2018;Yang et al, 2022). This could imply seasonal variability in the basal melt rates, as has been observed at both the Nivlisen Ice Shelf in East Antarctica (Lindbäck et al, 2019) and the Filchner-Ronne Ice Shelf (Vaňková and Nicholls, 2022).…”

Section: Discussionmentioning

confidence: 77%

REMA reveals spatial variability within the Dotson Melt Channel

Zinck

Wouters

Lambert

et al. 2023

Preprint

View full text Add to dashboard Cite

Abstract. The intrusion of warm circumpolar deep water causes ice shelves in the Amundsen and Bellinghausen Sea Embayments of Antarctica to melt from below, thereby potentially putting their stability at risk. Earlier studies have shown how digital elevation models can be used to obtain high-resolution ice shelf basal melt rates. However, there has been limited availability of high-resolution elevation data, a gap the Reference Elevation Model of Antarctica (REMA) has filled. In this study we use a novel combination of REMA and CryoSat-2 elevation data to obtain high-resolution basal melt rates of the Dotson Ice Shelf in a Lagrangian framework, at a 50 m spatial resolution on a 3-yearly temporal resolution. We present a novel Basal melt rates Using REMA and Google Earth Engine (BURGEE) method, which high resolution is supported through a sensitivity study assuming that the quality of the Lagrangian displacement is the main error source. The high-resolution basal melt rates show a good agreement with an earlier 500-m resolution basal melt product based on CryoSat-2, with a wide melt channel extending from the grounding line to the ice shelf front. Our high-resolution product indicates that the pathway and spatial variability of the main channel is influenced by a pinning point on the ice shelf. Additionally, it reveals a narrower coastal channel running along the western margin, which was not identified in the lower-resolution melt product, but does show up in a recent ocean modeling study. This emphasizes the importance of high-resolution basal melt rates to expand our understanding of channel formation and melt patterns. BURGEE can be expanded to a Pan-Antarctic study of high-resolution basal melt rates. This will provide a better picture of the (in)stability of Antarctic ice shelves.

show abstract

Section: Discussionmentioning

confidence: 77%

REMA reveals spatial variability within the Dotson Melt Channel

Zinck

Wouters

Lambert

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Other processes, such as eddies (Daae et al., 2017; Foppert et al., 2019; Stewart & Thompson, 2015), Ekman pumping (Dotto et al., 2019; Kim et al., 2017), and circulation changes over the continental shelf (Daae et al., 2017; Darelius et al., 2016; Yang et al., 2022), are also of great importance to mCDW intrusions onto the continental shelf. These earlier studies showed that wind changes over the continental shelf play an important role in these processes and have a significant influence on the mCDW transport and water mass property changes over the continental shelf.…”

Section: Discussionmentioning

confidence: 99%

Wind‐Driven Seasonal Intrusion of Modified Circumpolar Deep Water Onto the Continental Shelf in Prydz Bay, East Antarctica

et al. 2022

View full text Add to dashboard Cite

Intrusion of warm modified Circumpolar Deep Water (mCDW) is critical to heat transport onto the continental shelf around Antarctica, with substantial impacts on basal melting of ice shelves and sea ice production. We use hydrographic data collected in Prydz Bay, East Antarctica, and atmospheric and ocean reanalyses to investigate the seasonality of mCDW intrusions onto the East Antarctic continental shelf. Mooring measurements confirm that there is significant intrusion of mCDW over the inner continental shelf of Prydz Bay in March–July (austral autumn and early winter). The warming signal of intruded mCDW over the inner shelf is correlated with wind changes north of the shelf break, with a significant lag. This suggests that the autumn‐winter mCDW intrusions over the inner shelf are significantly affected by the wind regime north of the shelf break in January–May, when a southward displacement of the westerly winds occurs. The southward shift of westerly winds drives the shallowest depth of upwelled mCDW to move poleward and contributes more warm water to the shelf break. This results in the shoaling of mCDW near the shelf break in January–May and promotes mCDW intrusions onto the continental shelf. The dynamic barrier imposed on mCDW intrusions by the strong Antarctic Slope Front in January–May is offset by this shoaling of mCDW. This study indicates the strong sensitivity of continental shelves in East Antarctica to atmospheric forcing changes over the Southern Ocean.

show abstract

“…Yager et al, 2012). The intrusion of CDW into the Amundsen Shelf through the Dotson Trough provides the heat that accelerates ice melt (Jenkins et al, 2010; T. W. Yang et al, 2022). The mixing of CDW with overlying shelf waters forms mCDW (Jenkins et al, 2010;Miles et al, 2016).…”

Section: 1029/2022jg007053mentioning

confidence: 99%