Synthetic aperture radar (SAR) backscatter response from methane ebullition bubbles trapped by thermokarst lake ice

Thermokarst lakes, formed by permafrost thaw, are an important source of atmospheric methane (CH4), a powerful greenhouse gas. Ebullition (bubbling) is often the dominant mode of lake CH4 emission. Because extrapolating spatially limited field measurements of CH4 ebullition induces large uncertainties in regional emission estimates, there is a need for remote sensing based approaches to detect and quantify CH4 ebullition at larger spatial scales in lakes. We examined the relationship between spaceborne synthetic aperture radar (SAR) pixel values of lake ice and biogeochemical field measurements of CH4 ebullition on ten lakes on the northern Seward Peninsula. Among lakes, ebullition ranged from low to high. We found that both the area of ice-bound ebullition-bubble clusters and the bubbling rates that generated the clusters were correlated with L-band single-polarized (HH) SAR (R2 = 0.70, p = 0.002, n = 10) and with the “roughness” component of a Pauli decomposition of L-band quad-polarized SAR (R2 = 0.77, p = 0.001, n = 10). No relationship was found between ERS-2 C-band single-polarized (VV) SAR and ice-trapped CH4 bubbles. Results of this study indicate that analysis of L-band SAR backscatter intensity from winter lake ice could be a valuable new tool for constraining estimates of regional ebullition in lakes.

[1]  Martin O. Jeffries,et al.  A Method To Determine Lake Depth and Water Availability on the North Slope of Alaska with Spaceborne Imaging Radar and Numerical Ice Growth Modelling , 1996 .

[2]  Ping Wang,et al.  Thermal regime of a thermokarst lake and its influence on permafrost, Beiluhe Basin, Qinghai‐Tibet Plateau , 2010 .

[3]  Robert F. Stallard,et al.  Methane emission by bubbling from Gatun Lake, Panama , 1994 .

[4]  Edward G. Josberger,et al.  Remote sensing of frozen lakes on the North Slope of Alaska , 2004, IGARSS 2004. 2004 IEEE International Geoscience and Remote Sensing Symposium.

[5]  Richard K. Moore,et al.  Microwave Remote Sensing - Active and Passive - Volume I - Microwave Remote Sensing Fundamentals and Radiometry , 1981 .

[6]  K. W. Anthony,et al.  Simulating the decadal‐ to millennial‐scale dynamics of morphology and sequestered carbon mobilization of two thermokarst lakes in NW Alaska , 2012 .

[7]  Guido Grosse,et al.  Using the deuterium isotope composition of permafrost meltwater to constrain thermokarst lake contributions to atmospheric CH4 during the last deglaciation , 2012 .

[8]  C. Duguay,et al.  Ice‐cover variability on shallow lakes at high latitudes: model simulations and observations , 2003 .

[9]  Brian Menounos,et al.  Contribution of Alaskan glaciers to sea-level rise derived from satellite imagery , 2010 .

[10]  Hiroyuki Wakabayashi,et al.  Structural and stratigraphie features and ERS 1 synthetic aperture radar backscatter characteristics of ice growing on shallow lakes in NW Alaska, winter 1991–1992 , 1994 .

[11]  Robert Leconte,et al.  A controlled experiment to retrieve freshwater ice characteristics from an FM-CW radar system , 2009 .

[12]  R. Barry,et al.  Statistics and characteristics of permafrost and ground-ice distribution in the Northern Hemisphere , 1999 .

[13]  Claude R. Duguay,et al.  The Potential Use of Synthetic Aperture Radar for Estimating Methane Ebullition From Arctic Lakes 1 , 2008 .

[14]  Katey Walter Anthony,et al.  Constraining spatial variability of methane ebullition seeps in thermokarst lakes using point process models , 2013 .

[15]  Y. Pi,et al.  Polarization decomposition with S and T matrix of a PolSAR image , 2009, 2009 International Conference on Communications, Circuits and Systems.

[16]  Sergey Zimov,et al.  North Siberian Lakes: A Methane Source Fueled by Pleistocene Carbon , 1997 .

[17]  R. J. Brown,et al.  Correlations between X-, C-, and L-band imagery within an agricultural environment , 1992 .

[18]  Jack C. Mellor,et al.  Bathymetry of Alaskan arctic lakes: a key to resource inventory with remote-sensing methods , 1982 .

[19]  Dorothy K. Hall,et al.  Remote sensing applications to hydrology: imaging radar , 1996 .

[20]  Guido Grosse,et al.  Modern thermokarst lake dynamics in the continuous permafrost zone, northern Seward Peninsula, Alaska , 2011 .

[21]  Franz J. Meyer,et al.  Characterization and correction of residual RFI signatures in operationally processed ALOS PALSAR imagery , 2012 .

[22]  F. Chapin,et al.  Methane bubbling from Siberian thaw lakes as a positive feedback to climate warming , 2006, Nature.

[23]  W. F. Weeks,et al.  Ice processes and growth history on Arctic and sub-Arctic lakes using ERS-1 SAR data , 1995, Polar Record.

[24]  F. Stuart Chapin,et al.  Estimating methane emissions from northern lakes using ice‐bubble surveys , 2010 .

[25]  Marika M. Holland,et al.  Accelerated Arctic land warming and permafrost degradation during rapid sea ice loss , 2008 .

[26]  W. F. Weeks,et al.  Interesting Features Of Radar Imagery Of Ice-Covered North Slope Lakes , 1977 .

[27]  F. Chapin,et al.  Permafrost and the Global Carbon Budget , 2006, Science.

[28]  Josefino C. Comiso,et al.  Accelerated decline in the Arctic sea ice cover , 2008 .

[29]  M. Jeffries,et al.  Bathymetric Mapping of Shallow Water in Thaw Lakes on the North Slope of Alaska with Spaceborne Imaging Radar , 2000 .

[30]  E. Pottier,et al.  Polarimetric Radar Imaging: From Basics to Applications , 2009 .

[31]  Guido Grosse,et al.  Vulnerability of high‐latitude soil organic carbon in North America to disturbance , 2011 .

[32]  C. Martens,et al.  Sediment-Water Chemical Exchange in the Coastal Zone Traced by in situ Radon-222 Flux Measurements , 1980, Science.

[33]  Guoqing Sun,et al.  Mapping biomass of a northern forest using multifrequency SAR data , 1994, IEEE Trans. Geosci. Remote. Sens..

[34]  J. Canadell,et al.  Soil organic carbon pools in the northern circumpolar permafrost region , 2009 .

[35]  Thomas Meissner,et al.  The complex dielectric constant of pure and sea water from microwave satellite observations , 2004, IEEE Transactions on Geoscience and Remote Sensing.

[36]  Franz J. Meyer,et al.  Characterization and extent of randomly-changing radio frequency interference in ALOS PALSAR data , 2011, 2011 IEEE International Geoscience and Remote Sensing Symposium.

[37]  G. Grosse,et al.  Ground penetrating radar detection of subsnow liquid overflow on ice-covered lakes in interior Alaska , 2012 .

[38]  Patrick M. Crill,et al.  Freshwater Methane Emissions Offset the Continental Carbon Sink , 2011, Science.

[39]  Claude R. Duguay,et al.  RADARSAT backscatter characteristics of ice growing on shallow sub‐Arctic lakes, Churchill, Manitoba, Canada , 2002 .

[40]  E. Schuur,et al.  Fossil organic matter characteristics in permafrost deposits of the northeast Siberian Arctic , 2011 .

[41]  J. Cassano,et al.  Impacts of reduced sea ice on winter Arctic atmospheric circulation, precipitation, and temperature , 2009 .

[42]  Eric Pottier,et al.  A review of target decomposition theorems in radar polarimetry , 1996, IEEE Trans. Geosci. Remote. Sens..

[43]  T. Miyazaki,et al.  Falling atmospheric pressure as a trigger for methane ebullition from peatland , 2007 .

[44]  Claude R. Duguay,et al.  Determining depth and ice thickness of shallow sub-Arctic lakes using space-borne optical and SAR data , 2003 .

[45]  Guido Grosse,et al.  Geologic methane seeps along boundaries of Arctic permafrost thaw and melting glaciers , 2012 .

[46]  L. Plug,et al.  Thaw lake expansion in a two‐dimensional coupled model of heat transfer, thaw subsidence, and mass movement , 2009 .

[47]  J. Overland,et al.  Ongoing Climate Change in the Arctic , 2011, AMBIO.

[48]  M. Jeffries,et al.  Ice island detection and characterization with airborne synthetic aperture radar , 1990 .

[49]  Guido Grosse,et al.  Peat accumulation in drained thermokarst lake basins in continuous, ice-rich permafrost, northern Seward Peninsula, Alaska , 2011 .

[50]  D. Hopkins,et al.  The Full-Glacial Environment of the Northern Seward Peninsula, Alaska, Reconstructed from the 21,500-Year-Old Kitluk Paleosol , 2000, Quaternary Research.

[51]  J. Tison,et al.  Gas properties of winter lake ice in Northern Sweden: implication for carbon gas release , 2012 .

[52]  Richard K. Moore,et al.  Microwave Remote Sensing, Active and Passive , 1982 .

[53]  P. Crill,et al.  Bubbles trapped in arctic lake ice: Potential implications for methane emissions , 2011 .

[54]  Vladimir E. Romanovsky,et al.  Permafrost thermal state in the polar Northern Hemisphere during the international polar year 2007–2009: a synthesis , 2010 .

[55]  F. Chapin,et al.  Evidence and Implications of Recent Climate Change in Northern Alaska and Other Arctic Regions , 2004 .

[56]  Guido Grosse,et al.  Thermokarst lakes, drainage, and drained basins , 2013 .

[57]  J. Mcquaid,et al.  Air pressure and methane fluxes , 1991, Nature.

[58]  L. Smith,et al.  Methane bubbling from northern lakes: present and future contributions to the global methane budget , 2007, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[59]  F. Chapin,et al.  Methane production and bubble emissions from arctic lakes: Isotopic implications for source pathways and ages , 2008 .