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SMOS prototype algorithm for detecting autumn soil freezing
2016
Remote Sensing of Environment
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Acknowledgments This research was supported by European Space Agency projects "SMOS + Innovation: Application of SMOS data for the characterization of the freeze/thaw cycle and the retrieval of permafrost ...
information" (ESA contract 4000105184/12/I-BG), "SMOS + Frost2 Study" (ESA contract 4000110973/14/NL/FF/lf), and the Finnish Academy Centre of Excellence in Atmospheric Science (272041). ...
Method
Background Our soil F/T-state retrieval algorithm is based on detecting the annual changes in soil permittivity along with soil freezing and thawing. ...
doi:10.1016/j.rse.2016.01.012
fatcat:g2reh3pubnd4vav7rmhsjch3e4
Utilization of ancillary data sets for SMAP algorithm development and product generation
2011
2011 IEEE International Geoscience and Remote Sensing Symposium
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Once launched in late 2014/early 2015, the Soil Moisture Active Passive (SMAP) mission will provide high resolution global mapping of soil moisture and its freeze/thaw state every 2-3 days. ...
In order for soil moisture and freeze/thaw to be retrieved accurately from SMAP microwave data, a variety of global static and dynamic ancillary data are required. ...
overall soil moisture or freeze/thaw retrieval accuracy, and its compatibility with similar choices made by the SMOS mission. ...
doi:10.1109/igarss.2011.6049703
dblp:conf/igarss/ONeillPN11
fatcat:3kizzfh25fgnrbbychbbuersx4
The scale-dependence of SMOS soil moisture accuracy and its improvement through land data assimilation in the central Tibetan Plateau
2014
Remote Sensing of Environment
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Meanwhile, very few retrievals are available in winter due to the presence of frozen soil and snow cover, and the accuracy of ascending retrievals degrades during transition when diurnal freezing-thawing ...
This finding indicates the applicability of SMOS retrievals is scaledependent. ...
Acknowledgment This research was financially supported by National Natural Science Foundation of China (grant nos. 41325019 and 41190083), and the National Natural Science Foundation of China (grant no ...
doi:10.1016/j.rse.2014.07.005
fatcat:reeduhjqdnhxdfaicrohbruly4
USING SMOS PASSIVE MICROWAVE DATA TO DEVELOP SMAP FREEZE/THAW ALGORITHMS ADAPTED FOR THE CANADIAN SUBARCTIC
2015
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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SMOS time series data were analyzed to examine seasonal variations of soil freezing, and to assess the impact of land cover on the Freeze/Thaw cycle. ...
The average accuracies are 80% and 84% for the soil freeze period, and soil thaw period respectively. The comparison is limited because of the small number of validation pixels. ...
The delay between the soil freezing and the water freezing, and also this delay in the thawing period cause errors. ...
doi:10.5194/isprsarchives-xl-1-w5-365-2015
fatcat:pojxws7txzglbav7povu5djioq
Soil dielectric characterization during freeze–thaw transitions using L-band coaxial and soil moisture probes
2021
Hydrology and Earth System Sciences
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Both instruments were used to characterize the permittivity of soil samples undergoing several freeze–thaw cycles in a laboratory environment. ...
To validate and improve satellite microwave data products, precise and reliable estimations of the relative permittivity (εr=ε/ε0=ε′-jε′′; unitless) of soils are required, particularly for frozen soils ...
We would like to thank Bilal Filali for his contribution to the design and manufacture of the probe, along with Simone Bircher, Arnaud Mialon, Yann Kerr and the entire CES-BIO team in Toulouse for their ...
doi:10.5194/hess-25-1117-2021
fatcat:geatovzsejb73h3v7a52kpezfm
Utilizing Earth Observations of Soil Freeze/Thaw Data and Atmospheric Concentrations to Estimate Cold Season Methane Emissions in the Northern High Latitudes
2021
Remote Sensing
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Here, we use a novel way to integrate remote sensing soil freeze/thaw (F/T) status from SMOS satellite to better capture the seasonality of methane emissions in the northern high latitude. ...
The SMOS F/T data provide daily information of soil freezing state in the northern latitudes, and in this study, the data is used to define the cold season in the high latitudes and, thus, improve our ...
Bristol (UNIVBRIS), University of Exeter, University of Urbino (UNIURB), and University of Wisconsin-Madison (UofWI) for performing high-quality CH 4 measurements at global sites and making them available ...
doi:10.3390/rs13245059
fatcat:322kg24w6fgxhgbtsvlampjwpy
Assimilating SMOS Brightness Temperature for Hydrologic Model Parameters and Soil Moisture Estimation with an Immune Evolutionary Strategy
2020
Remote Sensing
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In this study, a special assimilation scheme was proposed to jointly estimate parameters and soil moisture (SM) by assimilating brightness temperature (TB) from the Soil Moisture and Ocean Salinity (SMOS ...
To evaluate the effectiveness of the scheme, the estimated SM sets are compared with in-situ observations and SMOS products in Maqu on the Tibetan Plateau. ...
and SMOS SM retrievals. ...
doi:10.3390/rs12101556
fatcat:sj6ier2ipbh7rectez3j7i4ohm
Development and assessment of the SMAP enhanced passive soil moisture product
2018
Remote Sensing of Environment
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moisture and freeze-thaw state every two to three days using a radar and a radiometer operating at L-band frequencies. ...
existing hydrological applications and foster new ones. ...
While the loss necessarily ended the operational 134 production of several key soil moisture and freeze/thaw data products that rely on the 135 high-resolution radar data, it also spurred the development ...
doi:10.1016/j.rse.2017.08.025
pmid:32943797
pmcid:PMC7493025
fatcat:oteov5sqjrfydmxifee2flu6by
The NASA Soil Moisture Active Passive (SMAP) mission: Overview
2010
2010 IEEE International Geoscience and Remote Sensing Symposium
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Its mission design consists of L-band radiometer and radar instruments sharing a rotating 6-m mesh reflector antenna to provide high-resolution and highaccuracy global maps of soil moisture and freeze/ ...
The combined active/passive microwave soil moisture product will have a spatial resolution of 10 km and a mean latency of 24 hours. ...
and applications needs that could be wholly or partially met by a mission devoted to measuring surface soil moisture and its freeze/thaw state. ...
doi:10.1109/igarss.2010.5652291
dblp:conf/igarss/ONeillENK10
fatcat:azquozvhubezba5vboglmekuci
Retrieving landscape freeze/thaw state from Soil Moisture Active Passive (SMAP) radar and radiometer measurements
2017
Remote Sensing of Environment
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Acknowledgments The research described in this publication was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and ...
Work at the Imnavait sites was funded by the National Science Foundation Division of Polar Programs Arctic Observatory Network grant numbers 0632264 and 1107892 Canadian contributions to the SMAP mission ...
In addition to overall flag agreement, counts of freeze and thaw omission and commission errors ('false freeze' retrievals vs. 'false thaw' retrievals) are also tabulated. ...
doi:10.1016/j.rse.2017.03.007
fatcat:gmj3oabjbbcntomguudtta5s4y
NASA Soil Moisture Active Passive mission status and science performance
2016
2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
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This paper provides a status summary of the calibration and validation of the SMAP instruments and the quality assessment of its soil moisture and freeze/thaw products. ...
The Soil Moisture Active Passive (SMAP) observatory was launched January 31, 2015, and its L-band radiometer and radar instruments became operational since mid-April 2015. ...
The preliminary Cal/Val assessment has indicated excellent quality of the soil moisture and freeze/thaw products. ...
doi:10.1109/igarss.2016.7729020
dblp:conf/igarss/YuehEONE16
fatcat:ffe5hirjv5h6hgqyiolyqtyly4
Proxy Indicators for Mapping the End of the Vegetation Active Period in Boreal Forests Inferred from Satellite-Observed Soil Freeze and ERA-Interim Reanalysis Air Temperature
2018
PFG – Journal of Photogrammetry Remote Sensing and Geoinformation Science
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We tested for the first time the usability of satellite-observed soil freeze from the Soil Moisture and Ocean Salinity (SMOS) instrument as a proxy indicator for the end of vegetation active period (VAPend ...
The time when soil freeze commenced over the large SMOS pixel can be employed to estimate VAPend (R 2 0.84, RMSE 7.5 days), defined as the time when the photosynthetic capacity of the forest drops below ...
and freeze references to determine the soil freeze and thaw state. ...
doi:10.1007/s41064-018-0059-y
fatcat:qft7tub3r5dytnpkdsh3d7z65q
Evaluation of the validated Soil Moisture product from the SMAP radiometer
2016
2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
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NASA's Soil Moisture Active Passive (SMAP) mission launched on January 31, 2015 into a sunsynchronous 6 am/6 pm orbit with an objective to produce global mapping of high-resolution soil moisture and freeze-thaw ...
Additional improvements (including optimization of retrieval algorithm parameters and upscaling approaches) and methodology expansions (including increasing the number of core sites, model-based intercomparisons ...
NASA's SMAP (Soil Moisture Active Passive) mission launched on January 31, 2015 with a goal of providing global mapping of soil moisture and freeze/thaw state every 2-3 days using data from an L-band radiometer ...
doi:10.1109/igarss.2016.7729023
dblp:conf/igarss/ONeillCCDNBCJBP16
fatcat:sweledpu25cpldkayyo6df5jhm
Temperature effects on L-band vegetation optical depth of a boreal forest
2021
Remote Sensing of Environment
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Furthermore, the model's ability to explain L-VOD retrieved from brightness temperatures of the "Soil Moisture and Ocean Salinity" (SMOS) satellite over the "Sodankylä grid cell" is investigated. ...
This temperature response, observed at different temporal-and spatial scales, is captured by the proposed L-VOD model and explained by freezing tree sap-water and the dependence of water permittivity on ...
Level 2 Soil Moisture" (Contract no. 4000125649). ...
doi:10.1016/j.rse.2021.112542
fatcat:tccgv4uwxbfxratbwwfur7a5nm
Spatial Variability of L-Band Brightness Temperature during Freeze/Thaw Events over a Prairie Environment
2017
Remote Sensing
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representation of the strong F/T signal (i.e., T B increases and decreases when soil freezing and thawing, respectively). ...
Passive microwave measurements from space are known to be sensitive to the freeze/thaw (F/T) state of the land surface. ...
Conflicts of Interest: The authors declare no conflict of interest. Remote Sens. 2017, 9, 894 ...
doi:10.3390/rs9090894
fatcat:tkc2oscsejbp3itnj27jyemkde
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