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Combining in situ observations and remote sensing data to determine the spatial extent of rain-on-snow events on the Brøgger peninsula

Momber, Marion and Champagne, Olivier and Dedieu, Jean-Pierre and Zolina, Olga and Wendleder, Anna and Montpetit, Benoit and Bernard, Eric and Jacobi, HW (2023) Combining in situ observations and remote sensing data to determine the spatial extent of rain-on-snow events on the Brøgger peninsula. 2023 ASAR/RCM Users' Forum, 2023-11-27 - 2023-11-30, Montreal, Kanada.

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Climate change is particularly impacting the Arctic, where the temperature increase is stronger than the global mean due to Arctic Amplification. Long-term observations at sites such as Ny-Alesund on the Brøgger’s peninsula in Svalbard allow understanding meteorological changes taking place in the Arctic. In the last decades, Ny Alesund was affected by a large increase of winter temperatures leading to occasional periods of positive temperatures lasting few days. As a result, the number of rainfall events also increased, contributing to an early degradation of the snowpack on the Brogger peninsula. Meteorological measurements such as at Ny Alesund allow to quantify the temporal variability of these “rain on snow” (ROS) events at specific points. The goal of this study is (i) to spatialize recent ROS events on the Brøgger peninsula during the period 2019-2022 using remote sensing radar data and (ii) to characterize the atmospheric origin of these events using anomalies of 500 hPa height or the identification of cyclonic systems. We use SAR satellite images from each event, mainly TSX and RCM images provided by German and Canadian Space Agencies. We processed the images with a thresholding method in order to find the spatial elevation limits between wet and dry snow after the events. PlanetScope optical images are used for snow extent validation. During the ROS episodes, the snow remains generally dry upstream of the glaciers, while at lower altitudes the snow on the peninsula is systematically wet. These ROS episodes are associated to cyclonic systems originated from the Northern Atlantic Ocean, and to a strong Z500 gradient from high pressure centered in Norway and low pressure centered in Greenland. These results are important to better characterize the origins and the spatial variability of ROS events and to evaluate the impact of these specific events on glaciers, permafrost, or ecology.

Item URL in elib:https://elib.dlr.de/199482/
Document Type:Conference or Workshop Item (Speech)
Title:Combining in situ observations and remote sensing data to determine the spatial extent of rain-on-snow events on the Brøgger peninsula
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wendleder, AnnaUNSPECIFIEDhttps://orcid.org/0009-0005-1534-4732UNSPECIFIED
Montpetit, BenoitEnvironment and Climate Change Canada, Ottawa, ON, CanadaUNSPECIFIEDUNSPECIFIED
Date:November 2023
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:TerraSAR-C, Radarsat Constellation Mission, Svalbard, snow characteristics, Rain on Snow events, Arctic, terrabyte, Multi-SAR
Event Title:2023 ASAR/RCM Users' Forum
Event Location:Montreal, Kanada
Event Type:international Conference
Event Start Date:27 November 2023
Event End Date:30 November 2023
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - HPDA use
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > International Ground Segment
Deposited By: Wendleder, Anna
Deposited On:27 Nov 2023 12:04
Last Modified:24 Apr 2024 21:00

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