It’s all about water: from small scale hydrologic processes in ice wedge polygonal tundra and thermokarst lakes to larger scale river runoff (Lena River Delta, Siberia)
The Lena River Delta in Northern Yakutia forms one of the largest deltas in the Arctic and its catchment area (2 430 000 km2) is one of the largest in the whole of Eurasia. The Lena River distributes water and sediment in four main channels before discharging in total about 30 km3 of water through t...
Main Authors: | , , , , |
---|---|
Format: | Conference Object |
Language: | unknown |
Published: |
American Geophysical Union
2013
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/34871/ https://hdl.handle.net/10013/epic.43012 |
id |
ftawi:oai:epic.awi.de:34871 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:34871 2024-09-15T17:54:18+00:00 It’s all about water: from small scale hydrologic processes in ice wedge polygonal tundra and thermokarst lakes to larger scale river runoff (Lena River Delta, Siberia) Boike, Julia Langer, Moritz Fedorova, Irina Kutzbach, Lars Cresto Aleina, Fabio 2013-12 https://epic.awi.de/id/eprint/34871/ https://hdl.handle.net/10013/epic.43012 unknown American Geophysical Union Boike, J. orcid:0000-0002-5875-2112 , Langer, M. orcid:0000-0002-2704-3655 , Fedorova, I. , Kutzbach, L. and Cresto Aleina, F. (2013) It’s all about water: from small scale hydrologic processes in ice wedge polygonal tundra and thermokarst lakes to larger scale river runoff (Lena River Delta, Siberia) , Fall meeting, San Francisco, 9 November 2013 - 13 December 2013 . hdl:10013/epic.43012 EPIC3Fall meeting, San Francisco, 2013-11-09-2013-12-13American Geophysical Union Conference notRev 2013 ftawi 2024-06-24T04:08:32Z The Lena River Delta in Northern Yakutia forms one of the largest deltas in the Arctic and its catchment area (2 430 000 km2) is one of the largest in the whole of Eurasia. The Lena River distributes water and sediment in four main channels before discharging in total about 30 km3 of water through the delta into the Arctic Ocean every year and its discharge has been observed to be increasing. The goal of this presentation is to characterize the hydrologic processes that are strongly affected by a transient climate component- the permafrost. Permafrost plays a major role for storage and release of water to rivers and surface and subsurface water bodies. Conversely, the coupled water and heat fluxes in the atmosphere and below ground have a marked influence on the permafrost’s thermal regime. Our study site, the Lena River Delta, is also one of the coldest and driest places on Earth, with mean annual air temperatures of about -13 °C, a large annual air temperature range of about 44 °C and summer precipitation usually less than 150 mm. Very cold continuous permafrost of about −8.6 °C (11 m depth) underlays the area between about 400 and 600 m below surface and since 2006 the permafrost has warmed than 1 °C at 10.7 m. Roughly half of the land surface is dominated by wet surfaces, such as polygons, ponds and thermokarst lakes. This contribution summarizes past and ongoing research on hydrologic processes across spatial scales, from microtopographic processes of polygonal tundra to regional scale deltaic processes to assess short and long term changes in water fluxes. We quantify unfrozen water in soils, streams and river discharges and water bodies’ storage at larger scales. Water bodies were mapped using optical and radar satellite data with resolutions of 4 m or better, Landsat-5 TM at 30 m and the MODIS water mask at 250 m resolution. Ponds, i. e. water bodies with surface are smaller than 104 m, make over 95 % of the total number of water bodies and are not resolved in Landsat-scale land cover classifications. ... Conference Object Arctic Ocean Ice lena river permafrost Thermokarst Tundra wedge* Yakutia Siberia Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The Lena River Delta in Northern Yakutia forms one of the largest deltas in the Arctic and its catchment area (2 430 000 km2) is one of the largest in the whole of Eurasia. The Lena River distributes water and sediment in four main channels before discharging in total about 30 km3 of water through the delta into the Arctic Ocean every year and its discharge has been observed to be increasing. The goal of this presentation is to characterize the hydrologic processes that are strongly affected by a transient climate component- the permafrost. Permafrost plays a major role for storage and release of water to rivers and surface and subsurface water bodies. Conversely, the coupled water and heat fluxes in the atmosphere and below ground have a marked influence on the permafrost’s thermal regime. Our study site, the Lena River Delta, is also one of the coldest and driest places on Earth, with mean annual air temperatures of about -13 °C, a large annual air temperature range of about 44 °C and summer precipitation usually less than 150 mm. Very cold continuous permafrost of about −8.6 °C (11 m depth) underlays the area between about 400 and 600 m below surface and since 2006 the permafrost has warmed than 1 °C at 10.7 m. Roughly half of the land surface is dominated by wet surfaces, such as polygons, ponds and thermokarst lakes. This contribution summarizes past and ongoing research on hydrologic processes across spatial scales, from microtopographic processes of polygonal tundra to regional scale deltaic processes to assess short and long term changes in water fluxes. We quantify unfrozen water in soils, streams and river discharges and water bodies’ storage at larger scales. Water bodies were mapped using optical and radar satellite data with resolutions of 4 m or better, Landsat-5 TM at 30 m and the MODIS water mask at 250 m resolution. Ponds, i. e. water bodies with surface are smaller than 104 m, make over 95 % of the total number of water bodies and are not resolved in Landsat-scale land cover classifications. ... |
format |
Conference Object |
author |
Boike, Julia Langer, Moritz Fedorova, Irina Kutzbach, Lars Cresto Aleina, Fabio |
spellingShingle |
Boike, Julia Langer, Moritz Fedorova, Irina Kutzbach, Lars Cresto Aleina, Fabio It’s all about water: from small scale hydrologic processes in ice wedge polygonal tundra and thermokarst lakes to larger scale river runoff (Lena River Delta, Siberia) |
author_facet |
Boike, Julia Langer, Moritz Fedorova, Irina Kutzbach, Lars Cresto Aleina, Fabio |
author_sort |
Boike, Julia |
title |
It’s all about water: from small scale hydrologic processes in ice wedge polygonal tundra and thermokarst lakes to larger scale river runoff (Lena River Delta, Siberia) |
title_short |
It’s all about water: from small scale hydrologic processes in ice wedge polygonal tundra and thermokarst lakes to larger scale river runoff (Lena River Delta, Siberia) |
title_full |
It’s all about water: from small scale hydrologic processes in ice wedge polygonal tundra and thermokarst lakes to larger scale river runoff (Lena River Delta, Siberia) |
title_fullStr |
It’s all about water: from small scale hydrologic processes in ice wedge polygonal tundra and thermokarst lakes to larger scale river runoff (Lena River Delta, Siberia) |
title_full_unstemmed |
It’s all about water: from small scale hydrologic processes in ice wedge polygonal tundra and thermokarst lakes to larger scale river runoff (Lena River Delta, Siberia) |
title_sort |
it’s all about water: from small scale hydrologic processes in ice wedge polygonal tundra and thermokarst lakes to larger scale river runoff (lena river delta, siberia) |
publisher |
American Geophysical Union |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/34871/ https://hdl.handle.net/10013/epic.43012 |
genre |
Arctic Ocean Ice lena river permafrost Thermokarst Tundra wedge* Yakutia Siberia |
genre_facet |
Arctic Ocean Ice lena river permafrost Thermokarst Tundra wedge* Yakutia Siberia |
op_source |
EPIC3Fall meeting, San Francisco, 2013-11-09-2013-12-13American Geophysical Union |
op_relation |
Boike, J. orcid:0000-0002-5875-2112 , Langer, M. orcid:0000-0002-2704-3655 , Fedorova, I. , Kutzbach, L. and Cresto Aleina, F. (2013) It’s all about water: from small scale hydrologic processes in ice wedge polygonal tundra and thermokarst lakes to larger scale river runoff (Lena River Delta, Siberia) , Fall meeting, San Francisco, 9 November 2013 - 13 December 2013 . hdl:10013/epic.43012 |
_version_ |
1810430575289303040 |