Short-term glacier area changes, glacier geometry dependence, and regional climatic variations forcing, King George Island, Antarctica
Abstract This study investigates the transient snowline (TSL) altitude for summer 2020, as well as glacial area loss in King George Island Icefields since 1988 using Sentinel-1 and 2 and Landsat Thematic Mapper (TM) imagery. Trends and anomalies in atmospheric temperature, U-wind, and V-wind were ex...
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| Format: | Article |
| Language: | English |
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Academia Brasileira de Ciências
2023-12-01
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| Series: | Anais da Academia Brasileira de Ciências |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652023000601108&tlng=en |
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| author | JÚLIA L. LORENZ KÁTIA K. DA ROSA CARINA PETSCH CLEIVA PERONDI FILIPE D. IDALINO JEFFREY DANIEL AUGER ROSEMARY VIEIRA JEFFERSON C. SIMÕES |
| author_facet | JÚLIA L. LORENZ KÁTIA K. DA ROSA CARINA PETSCH CLEIVA PERONDI FILIPE D. IDALINO JEFFREY DANIEL AUGER ROSEMARY VIEIRA JEFFERSON C. SIMÕES |
| author_sort | JÚLIA L. LORENZ |
| collection | DOAJ |
| description | Abstract This study investigates the transient snowline (TSL) altitude for summer 2020, as well as glacial area loss in King George Island Icefields since 1988 using Sentinel-1 and 2 and Landsat Thematic Mapper (TM) imagery. Trends and anomalies in atmospheric temperature, U-wind, and V-wind were examined using ERA5 solutions. Results show the wet-snow zone corresponds to values of ≤ -13dB, and 44.3% of the glacial area is located above the TSL (≥ 300 m). Glacial area for 2020 is 999.95 km², and losses in the period represent 104.9 km² (error <1%) – a retreat of 3.17 km² / year. Glaciers in Keller Peninsula and Bellingshausen Dome lost the most area (28% and 17%, respectively) and did not have a TSL in 2020; followed by Warszawa (15%), Kraków (13%), and Eastern (10%), where the TSL was verified. Percentage area loss values increased with decreases in dimensions, area above TSL, and maximum elevation. Calving glaciers with ice-flow toward deeper and steeper submarine sectors (Bransfield Strait) exhibited greater glacier variations. The trend in warming atmospheric temperature was greater in the Bransfield Strait than in the Drake Passage. TSL and retreat difference between glaciers were influenced by climatic and ocean input, as well as multiple environmental factors. |
| first_indexed | 2024-03-09T02:53:59Z |
| format | Article |
| id | doaj.art-4bc82243cb014bdfb8fd3c10e4fabcfd |
| institution | Directory Open Access Journal |
| issn | 1678-2690 |
| language | English |
| last_indexed | 2024-03-09T02:53:59Z |
| publishDate | 2023-12-01 |
| publisher | Academia Brasileira de Ciências |
| record_format | Article |
| series | Anais da Academia Brasileira de Ciências |
| spelling | doaj.art-4bc82243cb014bdfb8fd3c10e4fabcfd2023-12-05T07:50:41ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências1678-26902023-12-0195suppl 310.1590/0001-3765202320211627Short-term glacier area changes, glacier geometry dependence, and regional climatic variations forcing, King George Island, AntarcticaJÚLIA L. LORENZhttps://orcid.org/0000-0003-1695-1807KÁTIA K. DA ROSAhttps://orcid.org/0000-0003-0977-9658CARINA PETSCHhttps://orcid.org/0000-0002-1079-0080CLEIVA PERONDIhttps://orcid.org/0000-0003-2202-2721FILIPE D. IDALINOhttps://orcid.org/0000-0001-5587-5208JEFFREY DANIEL AUGERhttps://orcid.org/0000-0002-2304-2292ROSEMARY VIEIRAhttps://orcid.org/0000-0003-0312-2890JEFFERSON C. SIMÕEShttps://orcid.org/0000-0001-5555-3401Abstract This study investigates the transient snowline (TSL) altitude for summer 2020, as well as glacial area loss in King George Island Icefields since 1988 using Sentinel-1 and 2 and Landsat Thematic Mapper (TM) imagery. Trends and anomalies in atmospheric temperature, U-wind, and V-wind were examined using ERA5 solutions. Results show the wet-snow zone corresponds to values of ≤ -13dB, and 44.3% of the glacial area is located above the TSL (≥ 300 m). Glacial area for 2020 is 999.95 km², and losses in the period represent 104.9 km² (error <1%) – a retreat of 3.17 km² / year. Glaciers in Keller Peninsula and Bellingshausen Dome lost the most area (28% and 17%, respectively) and did not have a TSL in 2020; followed by Warszawa (15%), Kraków (13%), and Eastern (10%), where the TSL was verified. Percentage area loss values increased with decreases in dimensions, area above TSL, and maximum elevation. Calving glaciers with ice-flow toward deeper and steeper submarine sectors (Bransfield Strait) exhibited greater glacier variations. The trend in warming atmospheric temperature was greater in the Bransfield Strait than in the Drake Passage. TSL and retreat difference between glaciers were influenced by climatic and ocean input, as well as multiple environmental factors.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652023000601108&tlng=enclimate changeglacier fluctuationsNDSISentinelsnowline |
| spellingShingle | JÚLIA L. LORENZ KÁTIA K. DA ROSA CARINA PETSCH CLEIVA PERONDI FILIPE D. IDALINO JEFFREY DANIEL AUGER ROSEMARY VIEIRA JEFFERSON C. SIMÕES Short-term glacier area changes, glacier geometry dependence, and regional climatic variations forcing, King George Island, Antarctica Anais da Academia Brasileira de Ciências climate change glacier fluctuations NDSI Sentinel snowline |
| title | Short-term glacier area changes, glacier geometry dependence, and regional climatic variations forcing, King George Island, Antarctica |
| title_full | Short-term glacier area changes, glacier geometry dependence, and regional climatic variations forcing, King George Island, Antarctica |
| title_fullStr | Short-term glacier area changes, glacier geometry dependence, and regional climatic variations forcing, King George Island, Antarctica |
| title_full_unstemmed | Short-term glacier area changes, glacier geometry dependence, and regional climatic variations forcing, King George Island, Antarctica |
| title_short | Short-term glacier area changes, glacier geometry dependence, and regional climatic variations forcing, King George Island, Antarctica |
| title_sort | short term glacier area changes glacier geometry dependence and regional climatic variations forcing king george island antarctica |
| topic | climate change glacier fluctuations NDSI Sentinel snowline |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652023000601108&tlng=en |
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