{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T20:56:40Z","timestamp":1785185800983,"version":"3.55.0"},"reference-count":43,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2015,12,18]],"date-time":"2015-12-18T00:00:00Z","timestamp":1450396800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Radar backscattering properties can be extremely sensitive to the freeze\/thaw states of the ground surface. This study aims to evaluate the changes of L-band microwave scattering characteristics between thawed and frozen conditions by using polarimetric scattering mechanism indicators. ALOS PALSAR polarimetric mode data acquired in winter and spring seasons over Eastern Siberia are used in this study. Experimental results show that the actual scattering mechanisms and their seasonal variations over various forested and non-forested permafrost ecosystems can be successfully characterized by the polarimetric target decomposition parameters and the polarimetric coherences. In addition, fully polarimetric radar observations exhibit great potential for mapping land cover types and surficial features in the permafrost active layer. Particularly, the co-polarization coherences on the HV-polarization basis and circular-polarization basis were found to be very useful for discriminating different surficial geocryological characteristics in recently burnt forests and thermokarst regions.<\/jats:p>","DOI":"10.3390\/rs71215874","type":"journal-article","created":{"date-parts":[[2015,12,18]],"date-time":"2015-12-18T10:15:04Z","timestamp":1450433704000},"page":"17135-17148","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":32,"title":["Variations of Microwave Scattering Properties by Seasonal Freeze\/Thaw Transition in the Permafrost Active Layer Observed by ALOS PALSAR Polarimetric Data"],"prefix":"10.3390","volume":"7","author":[{"given":"Sang-Eun","family":"Park","sequence":"first","affiliation":[{"name":"Department of Geoinformation Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 143-747, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2015,12,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"131","DOI":"10.1016\/0034-4257(94)90049-3","article-title":"Monitoring freeze-thaw cycles along north-south Alaskan transects using ERS-1 SAR","volume":"49","author":"Rignot","year":"1994","journal-title":"Remote Sens. Environ."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"29673","DOI":"10.1029\/96JD03878","article-title":"Winter and spring thaw as observed with imaging radar at BOREAS","volume":"102","author":"Way","year":"1997","journal-title":"J. Geophys. Res."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1804","DOI":"10.1109\/36.851764","article-title":"Monitoring of seasonal thawing in Siberia with ERS scatterometer data","volume":"38","author":"Wisemann","year":"2000","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1016\/S0034-4257(00)00160-7","article-title":"Application of the NASA scatterometer (NSCAT) for determining the daily frozen and nonfrozen landscape of Alaska","volume":"75","author":"Kimball","year":"2001","journal-title":"Remote Sens. Environ."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"163","DOI":"10.1016\/j.rse.2002.06.004","article-title":"Radar remote sensing of the spring thaw transition across a boreal landscape","volume":"89","author":"Kimball","year":"2004","journal-title":"Remote Sens. Environ."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"360","DOI":"10.1016\/j.rse.2006.09.004","article-title":"Temporal and spatial variability of the beginning and end of daily spring freeze\/thaw cycles derived from scatterometer data","volume":"106","author":"Bartsch","year":"2007","journal-title":"Remote Sens. Environ."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"3457","DOI":"10.1016\/j.rse.2011.08.009","article-title":"Monitoring freeze\/thaw cycles using ENVISAT ASAR global mode","volume":"115","author":"Park","year":"2011","journal-title":"Remote Sens. Environ."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"145","DOI":"10.1016\/0034-4257(94)90051-5","article-title":"Monitoring of environmental conditions in taiga forests using ERS-1 SAR","volume":"49","author":"Rignot","year":"1994","journal-title":"Remote Sens. Environ."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"490","DOI":"10.1016\/j.rse.2010.09.018","article-title":"Retrieval of growing stock volume in boreal forest using hyper-temporal series of Envisat ASAR ScanSAR backscatter measurements","volume":"115","author":"Santoro","year":"2011","journal-title":"Remote Sens. Environ."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1119","DOI":"10.1080\/01431169008955084","article-title":"The effect of changing environmental conditions on microwave signatures of forest ecosystems: Preliminary results of the March 1988 Alaskan aircraft SAR experiment","volume":"11","author":"Way","year":"1990","journal-title":"Int. J. Remote Sens."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"371","DOI":"10.1109\/36.295051","article-title":"Polarization signatures of frozen and thawed forests of varying environmental state","volume":"32","author":"Kwok","year":"1994","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"353","DOI":"10.1109\/36.295050","article-title":"Evaluating the type and state of Alaska taiga forests with imaging radar for use in ecosystem models","volume":"32","author":"Way","year":"1994","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"4001","DOI":"10.1109\/TGRS.2009.2023906","article-title":"Signatures of ALOS PALSAR L-band backscatter in Swedish forest","volume":"47","author":"Santoro","year":"2009","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"927","DOI":"10.1109\/36.752211","article-title":"Multitemporal behavior of L- and C-band SAR observations of boreal forests","volume":"37","author":"Pulliainen","year":"1999","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"305","DOI":"10.1002\/aqc.836","article-title":"Satellite radar imagery for monitoring inland wetlands in boreal and sub-arctic environments","volume":"17","author":"Bartsch","year":"2007","journal-title":"Aquat. Conserv."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"56","DOI":"10.5589\/m07-047","article-title":"Wetland characterization using polarimetric Radasat-2 capability","volume":"33","author":"Touzi","year":"2007","journal-title":"Can. J. Remote Sens."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1868","DOI":"10.1016\/j.rse.2009.04.006","article-title":"Effects of soil moisture and water depth on ERS SAR backscatter measurements from an Alaskan wetland complex","volume":"113","author":"Kaisischke","year":"2009","journal-title":"Remote Sens. Environ."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"112","DOI":"10.1080\/07038992.1992.10855312","article-title":"Radar imagery for quaternary geological mapping in glaciated terrain","volume":"18","author":"Singhroy","year":"1992","journal-title":"Can. J. Remote Sens."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Harris, J. (2008). Remote Predictive Mapping: An Aid for Northern Mapping, Geological Survey of Canada.","DOI":"10.4095\/225997"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1","DOI":"10.5589\/m08-077","article-title":"Using multi-beam RADARSAT-1 imagery to augment mapping surficial geology in northwest Alberta, Canada","volume":"35","author":"Mei","year":"2009","journal-title":"Can. J. Remote Sens."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"5725","DOI":"10.3390\/rs5115725","article-title":"Polarimetric parameters for growing stock volume estimation using ALOS PALSAR L-band data over Siberian forests","volume":"5","author":"Chowdhury","year":"2013","journal-title":"Remote Sens."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"129","DOI":"10.1016\/j.rse.2014.05.007","article-title":"Growing stock volume estimation from L-band ALOS PALSAR polarimetric coherence in Siberian forest","volume":"155","author":"Chowdhury","year":"2014","journal-title":"Remote Sens. Environ."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"81","DOI":"10.1002\/ppp.473","article-title":"Thermokarst as a Short-term Permafrost Disturbance, Central Yakutia","volume":"15","author":"Brouchkov","year":"2004","journal-title":"Permafr. Periglac. Process."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Iwahana, G., Machimura, T., Kobayashi, Y., Fedorov, A.N., Konstantinov, P.Y., and Fukuda, M. (2005). Influence of forest clear-cutting on the thermal and hydrological regime of the active layer near Yakutsk, eastern Siberia. J. Geophys. Res. Biogeosci., 110.","DOI":"10.1029\/2005JG000039"},{"key":"ref_25","first-page":"5","article-title":"Recent vegetation fire incidence in Russia","volume":"15","author":"Hayasaka","year":"2011","journal-title":"Glob. Environ. Res."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1968","DOI":"10.1016\/j.agrformet.2008.09.013","article-title":"Comparison of carbon and water vapor exchange of forest and grassland in permafrost regions in Central Yakutia, Russia","volume":"148","author":"Lopez","year":"2008","journal-title":"Agric. For. Meteorol."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"3074","DOI":"10.1002\/hyp.10424","article-title":"Snowmelt and the hydrological interaction of forest-grassland ecosystems in Central Yakutia, eastern Siberia","volume":"29","author":"Lopez","year":"2015","journal-title":"Hydrol. Process."},{"key":"ref_28","first-page":"25","article-title":"ERA-Interim: New ECMWF reanalysis products from 1989 onwards","volume":"110","author":"Simmons","year":"2007","journal-title":"ECMWF Newsl."},{"key":"ref_29","unstructured":"Lee, J.S., and Pottier, E. (2009). Polarimetric Radar Imaging\u2014From Basics to Applications, CRC Press."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"850","DOI":"10.1126\/science.1244693","article-title":"High-resolution global maps of 21st-century forest cover change","volume":"342","author":"Hansen","year":"2013","journal-title":"Science"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1609","DOI":"10.1109\/TGRS.2005.864142","article-title":"Intensity-driven adaptive neighborhood technique for polarimetric and interferometric SAR parameters estimation","volume":"44","author":"Vasile","year":"2006","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Fritz, J., and Chandrasekar, V. (2008, January 8\u201311). The impact of adaptive speckle filtering on multichannel SAR change detection. Proceedings of the IEEE Geoscience and Remote Sensing Symposium 2008, Boston, MA, USA.","DOI":"10.1109\/IGARSS.2008.4779783"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"963","DOI":"10.1109\/36.673687","article-title":"A three-component scattering model for polarimetric SAR data","volume":"36","author":"Freeman","year":"1998","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"1699","DOI":"10.1109\/TGRS.2005.852084","article-title":"Four-component scattering model for polarimetric SAR image decomposition","volume":"43","author":"Yamaguchi","year":"2005","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"2251","DOI":"10.1109\/TGRS.2010.2099124","article-title":"Four-component scattering power decomposition with rotation of coherency matrix","volume":"49","author":"Yamaguchi","year":"2011","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"4997","DOI":"10.3390\/rs70504997","article-title":"The effect of topography on target decomposition of polarimetric SAR data","volume":"7","author":"Park","year":"2015","journal-title":"Remote Sens."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"498","DOI":"10.1109\/36.485127","article-title":"A review of target decomposition theorems in radar polarimetry","volume":"34","author":"Cloude","year":"1996","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"68","DOI":"10.1109\/36.551935","article-title":"An entropy based classification scheme for land applications of polarimetric SAR","volume":"35","author":"Cloude","year":"1997","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"954","DOI":"10.1109\/36.602537","article-title":"The effect of surface roughness on multifrequency polarimetric SAR data","volume":"35","author":"Mattia","year":"1997","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_40","first-page":"2355","article-title":"A study on polarimetric correlation coefficient for feature extraction of polarimetric SAR data","volume":"88","author":"Moriyama","year":"2005","journal-title":"IEICE Trans. Commun."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"297","DOI":"10.1093\/ietcom\/e91-b.1.297","article-title":"Classification of terrain by implementing the correlation coefficient in the circular polarization basis using X-band POLSAR data","volume":"91","author":"Yamaguchi","year":"2008","journal-title":"IEICE Trans. Commun."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1022","DOI":"10.1109\/TGRS.2008.2008908","article-title":"Estimation of surface roughness parameter in intertidal mudflat using airborne polarimetric SAR data","volume":"47","author":"Park","year":"2009","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"212","DOI":"10.1016\/j.rse.2013.01.018","article-title":"Polarimetric SAR remote sensing of the 2011 Tohoku earthquake using ALOS\/PALSAR","volume":"132","author":"Park","year":"2013","journal-title":"Remote Sens. Environ."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/7\/12\/15874\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T20:54:19Z","timestamp":1760216059000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/7\/12\/15874"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2015,12,18]]},"references-count":43,"journal-issue":{"issue":"12","published-online":{"date-parts":[[2015,12]]}},"alternative-id":["rs71215874"],"URL":"https:\/\/doi.org\/10.3390\/rs71215874","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2015,12,18]]}}}