Preprint Article Version 1 This version is not peer-reviewed

Surface Melt on Ross Ice Shelf Interior during a Downsloping Wind Event

Version 1 : Received: 5 November 2019 / Approved: 7 November 2019 / Online: 7 November 2019 (04:02:22 CET)

How to cite: Karmosky, C. Surface Melt on Ross Ice Shelf Interior during a Downsloping Wind Event. Preprints 2019, 2019110069 (doi: 10.20944/preprints201911.0069.v1). Karmosky, C. Surface Melt on Ross Ice Shelf Interior during a Downsloping Wind Event. Preprints 2019, 2019110069 (doi: 10.20944/preprints201911.0069.v1).

Abstract

On January 8, 2005, a surface melt event began on the interior portion of Ross Ice Shelf. While many surface melt events on Ross Ice Shelf are caused by the advection of warm air onto the shelf from the Ross Sea, surface winds during this event were directed offshore and the spatial pattern of surface melt was inconsistent with the Southern Ocean serving as a heat source. Rather, due to the interior location of the surface melt coupled with prevailing wind direction and surface temperature data it is thought that adiabatic warming of Föhn winds is the driving cause of this melt event. Passive Microwave (SSM/I) imagery was used to determine surface melt occurrence and the event’s extent. Spatial patterns of surface melt were then compared to NCEP/NCAR reanalysis output for several synoptic weather variables including surface temperatures, sea level pressure and surface vector winds. Synoptic-scale weather conditions were consistent with those that would produce downsloping wind (föhn) conditions in the interior of the Ross Ice Shelf where the anomalous surface melt was located.

Subject Areas

Antarctica; surface melt; ross ice shelf; Föhn Winds; remote sensing

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