Is spring melting in the Arctic detectable by under-ice radiation?
A trend towards earlier sea-ice melt is detected in many ice-covered regions in the Arctic. The timing of the melt onset has a strong impact on the sea-ice energy budget. Melt onset changes the radiative properties of the ice due to increasing snow wetness and meltwater. So far, satellite passive mi...
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ftawi:oai:epic.awi.de:58674 2024-06-02T07:59:47+00:00 Is spring melting in the Arctic detectable by under-ice radiation? Anhaus, Philipp Planat, Noémie Schiller, Martin Katlein, Christian Nicolaus, Marcel 2024-04-17 application/pdf https://epic.awi.de/id/eprint/58674/ https://epic.awi.de/id/eprint/58674/1/EGU24-5124_ANHAUS_main.pdf https://hdl.handle.net/10013/epic.e942512b-1c62-4f3b-82e4-27e6668be541 unknown https://epic.awi.de/id/eprint/58674/1/EGU24-5124_ANHAUS_main.pdf Anhaus, P. orcid:0000-0002-0671-8545 , Planat, N. , Schiller, M. orcid:0000-0002-0506-2759 , Katlein, C. orcid:0000-0003-2422-0414 and Nicolaus, M. orcid:0000-0003-0903-1746 (2024) Is spring melting in the Arctic detectable by under-ice radiation? hdl:10013/epic.e942512b-1c62-4f3b-82e4-27e6668be541 EPIC3 Conference NonPeerReviewed 2024 ftawi 2024-05-07T23:37:52Z A trend towards earlier sea-ice melt is detected in many ice-covered regions in the Arctic. The timing of the melt onset has a strong impact on the sea-ice energy budget. Melt onset changes the radiative properties of the ice due to increasing snow wetness and meltwater. So far, satellite passive microwave data are used to detect the melt onset. We analyzed transmitted radiation spectra as collected underneath drifting sea-ice using a remotely operated vehicle during the ARTofMELT expedition in the Fram Strait in spring 2023. We colocated those spectra with measurements of snow depth, sea ice and surface topography, chlorophyll-a concentration in the water column, and with aerial images. This combined dataset enables us to track down possible subsurface pathways and accumulation pools of meltwater. Areas of low snow load and depressed surface topography are characterized by higher transmitted radiation compared to areas with a thick snow cover. Those areas overlapped with areas that showed the first signs of surface melt. Chlorophyll-a concentrations varied only slightly in magnitude and did not match with the heterogeneous pattern of snow depth and ice topography. Here we discuss how to disentangle the influences of chlorophyll a and the subsurface meltwater on the spectral shape of transmitted radiation. We propose that upon successful disentanglement, the spectra can be used as an indicator for subsurface melting. Our study suggests that sea-ice melting starts subsurface and that measurements of transmitted solar radiation spectra could be used to identify the melt onset prior to surface melting. This can provide an interesting complementary information on melt occurrence and on the location of the water in the snowpack in addition to satellite passive microwave data. Conference Object Arctic Arctic Fram Strait Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
A trend towards earlier sea-ice melt is detected in many ice-covered regions in the Arctic. The timing of the melt onset has a strong impact on the sea-ice energy budget. Melt onset changes the radiative properties of the ice due to increasing snow wetness and meltwater. So far, satellite passive microwave data are used to detect the melt onset. We analyzed transmitted radiation spectra as collected underneath drifting sea-ice using a remotely operated vehicle during the ARTofMELT expedition in the Fram Strait in spring 2023. We colocated those spectra with measurements of snow depth, sea ice and surface topography, chlorophyll-a concentration in the water column, and with aerial images. This combined dataset enables us to track down possible subsurface pathways and accumulation pools of meltwater. Areas of low snow load and depressed surface topography are characterized by higher transmitted radiation compared to areas with a thick snow cover. Those areas overlapped with areas that showed the first signs of surface melt. Chlorophyll-a concentrations varied only slightly in magnitude and did not match with the heterogeneous pattern of snow depth and ice topography. Here we discuss how to disentangle the influences of chlorophyll a and the subsurface meltwater on the spectral shape of transmitted radiation. We propose that upon successful disentanglement, the spectra can be used as an indicator for subsurface melting. Our study suggests that sea-ice melting starts subsurface and that measurements of transmitted solar radiation spectra could be used to identify the melt onset prior to surface melting. This can provide an interesting complementary information on melt occurrence and on the location of the water in the snowpack in addition to satellite passive microwave data. |
format |
Conference Object |
author |
Anhaus, Philipp Planat, Noémie Schiller, Martin Katlein, Christian Nicolaus, Marcel |
spellingShingle |
Anhaus, Philipp Planat, Noémie Schiller, Martin Katlein, Christian Nicolaus, Marcel Is spring melting in the Arctic detectable by under-ice radiation? |
author_facet |
Anhaus, Philipp Planat, Noémie Schiller, Martin Katlein, Christian Nicolaus, Marcel |
author_sort |
Anhaus, Philipp |
title |
Is spring melting in the Arctic detectable by under-ice radiation? |
title_short |
Is spring melting in the Arctic detectable by under-ice radiation? |
title_full |
Is spring melting in the Arctic detectable by under-ice radiation? |
title_fullStr |
Is spring melting in the Arctic detectable by under-ice radiation? |
title_full_unstemmed |
Is spring melting in the Arctic detectable by under-ice radiation? |
title_sort |
is spring melting in the arctic detectable by under-ice radiation? |
publishDate |
2024 |
url |
https://epic.awi.de/id/eprint/58674/ https://epic.awi.de/id/eprint/58674/1/EGU24-5124_ANHAUS_main.pdf https://hdl.handle.net/10013/epic.e942512b-1c62-4f3b-82e4-27e6668be541 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Fram Strait Sea ice |
genre_facet |
Arctic Arctic Fram Strait Sea ice |
op_source |
EPIC3 |
op_relation |
https://epic.awi.de/id/eprint/58674/1/EGU24-5124_ANHAUS_main.pdf Anhaus, P. orcid:0000-0002-0671-8545 , Planat, N. , Schiller, M. orcid:0000-0002-0506-2759 , Katlein, C. orcid:0000-0003-2422-0414 and Nicolaus, M. orcid:0000-0003-0903-1746 (2024) Is spring melting in the Arctic detectable by under-ice radiation? hdl:10013/epic.e942512b-1c62-4f3b-82e4-27e6668be541 |
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1800743876116348928 |