Wetland maps including open water extent dynamics based on ENVISAT ASAR WS for Siberia, 2007 and 2008

Reschke, Julia; Bartsch, Annett; Schlaffer, Stefan; Schepaschenko, Dmitry

Wetlands store large amounts of carbon, and depending on their status and type, they release specific amounts of methane gas to the atmosphere. The connection between wetland type and methane emission has been investigated in various studies and utilized in climate change monitoring and modelling. For improved estimation of methane emissions, land surface models require information such as the wetland fraction and its dynamics over large areas. Existing datasets of wetland dynamics present the total amount of wetland (fraction) for each model grid cell, but do not discriminate the different wetland types like permanent lakes, periodically inundated areas or peatlands. Wetland types differently influence methane fluxes and thus their contribution to the total wetland fraction should be quantified. Especially wetlands of permafrost regions are expected to have a strong impact on future climate due to soil thawing. In this study ENIVSAT ASAR Wide Swath data was tested for operational monitoring of the distribution of areas with a long-term SW near 1 (hSW) in northern Russia (SW = degree of saturation with water, 1 = saturated), which is a specific characteristic of peatlands. For the whole northern Russia, areas with hSW were delineated and discriminated from dynamic and open water bodies for the years 2007 and 2008. The area identified with this method amounts to approximately 300,000 km**2 in northern Siberia in 2007. It overlaps with zones of high carbon storage. Comparison with a range of related datasets (static and dynamic) showed that hSW represents not only peatlands but also temporary wetlands associated with post-forest fire conditions in permafrost regions. Annual long-term monitoring of change in boreal and tundra environments is possible with the presented approach. Sentinel-1, the successor of ENVISAT ASAR, will provide data that may allow continuous monitoring of these wetland dynamics in the future complementing global observations of wetland fraction.

Comments

ENIVSAT ASAR Wide Swath data was tested for operational monitoring of the distribution of areas with a long-term high degree of saturation with water (hSW) as well as open water (10 day intervals). For the whole northern Russia, areas with hSW were delineated and discriminated from dynamic and open water bodies for the years 2007 and 2008. The identified areas overlap with zones of high carbon storage. Comparison with a range of related datasets (static and dynamic) showed that hSW represents not only peatlands but also temporary wetlands associated with post-forest fire conditions in permafrost regions. This experimental wetland product has been compiled within the framework of the ESA STSE ALANIS Methane project (www.alanis-methane.info). It covers most lowland areas of Siberia. The maps represent the snow-free season of 2007 and 2008, including open water with 10 day intervals for July and August 2007 over selected regions. Please consult the product guide regarding known issues and documentation. Quality is constrained by data availability, which is documented in the day (days since last update) and num (number of acquisitions used for the 10 day period) files. Nominal resolution is ~75m and projection is Universal Polar Stereographic North, WGS84. The the region of interest has been subdivided into 10 parts with varying extent.

Citation

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Contact

Annett Bartsch

Metadata Access

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APGC Dataset Metadata in JSON-Format

Data and Resources

Additional Info

Field Value
Identifier DOI: 10.1594/PANGAEA.834502
Project(s) Changing Permafrost in the Arctic and its Global Effects in the 21st Century
Institute Vienna University of Technology, Vienna, Austria
Source https://doi.pangaea.de/10.1594/PANGAEA.834502?format=html#download
Publication Date 2012
Version 1.0
Product Wetland maps
Sensor ENIVSAT ASAR
Files
  1. TUW_ASAWS_PTL_001_001_20070701_000001-20070930_235959_ALL_aux.zip
  2. TUW_ASAWS_PTL_001_001_20080701_000001-20080930_235959_ALL_aux.zip
Variables [Units]
  1. 70: Water Bodies
  2. 150: High degree of saturation
  3. 200: Other
Region Siberia
Spatial Reference EPSG:3995 WGS 84/Arctic Polar Stereographic
Spatial Resolution 75m
Spatial Coverage Latitude 65 to 72, Longitude 50 to 175
Temporal Coverage 2007-07-01 - 2007-08-01
Temporal Resolution 10 day intervals
Format TIF
Is Supplement To

Supplement to: Reschke, J et al. (2012): Capability of C-Band SAR for operational wetland monitoring at high latitudes. Remote Sensing, 4(12), 2923-2943, https://doi.org/10.3390/rs4102923

Related to

Trofaier, Anna Maria; Bartsch, Annett; Rees, William Gareth; Leibman, Marina O (2013): Assessment of spring floods and surface water extent over the Yamalo-Nenets Autonomous District. Environmental Research Letters, 8(4), 045026, https://doi.org/10.1088/1748-9326/8/4/045026

Bartsch, Annett; Trofaier, Anna Maria; Hayman, Garry; Sabel, Daniel; Schlaffer, Stefan; Clark, Douglas B; Blyth, Eleanor (2012): Detection of open water dynamics with ENVISAT ASAR in support of land surface modelling at high latitudes. Biogeosciences, 9, 703-714, https://doi.org/10.5194/bg-9-703-2012

Schlaffer, Stefan; Bartsch, Annett; Reschke, Julia (2012): ESA STSE-ALANIS methane - ASAR WS Local Wetlands product guide. Institute of Photogrammetry and Remote Sensing, Vienna University of Technology, 11 pp, hdl:10013/epic.43929.d001

Dataset extent

Map tiles and data by OpenStreetMap, under CC BY SA.