L-Band Soil Moisture Retrievals Using Microwave Based Temperature and Filtering. Towards Model-Independent Climate Data Records
The CCI Soil Moisture dataset (CCI SM) is the most extensive climate data record of satellite soil moisture to date. To maximize its function as a climate benchmark, both long-term consistency and (model-) independence are high priorities. Two unique L-band missions integrated into the CCI SM are SM...
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description | The CCI Soil Moisture dataset (CCI SM) is the most extensive climate data record of satellite soil moisture to date. To maximize its function as a climate benchmark, both long-term consistency and (model-) independence are high priorities. Two unique L-band missions integrated into the CCI SM are SMOS and SMAP. However, they lack the high-frequency microwave sensors needed to determine the effective temperature and snow/frozen flagging, and therefore use input from (varying) land surface models. In this study, the impact of replacing this model input by temperature and filtering based on passive microwave observations is evaluated. This is derived from an inter-calibrated dataset (ICTB) based on six passive microwave sensors. Generally, this leads to an expected increase in revisit time, which goes up by about 0.5 days (~15% loss). Only the boreal regions have an increased coverage due to more accurate freeze/thaw detection. The boreal regions become wetter with an increased dynamic range, while the tropics are dryer with decreased dynamics. Other regions show only small differences. The skill was evaluated against ERA5-Land and in situ observations. The average correlation against ERA5-Land increased by 0.05 for SMAP ascending/descending and SMOS ascending, whereas SMOS descending decreased by 0.01. For in situ sensors, the difference is less pronounced, with only a significant change in correlation of 0.04 for SM SMOS ascending. The results indicate that the use of microwave-based input for temperature and filtering is a viable and preferred alternative to the use of land surface models in soil moisture climate data records from passive microwave sensors. |
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Towards Model-Independent Climate Data Records</title><source>DOAJ Directory of Open Access Journals</source><source>MDPI - Multidisciplinary Digital Publishing Institute</source><source>EZB-FREE-00999 freely available EZB journals</source><creator>van der Schalie, Robin ; van der Vliet, Mendy ; Rodríguez-Fernández, Nemesio ; Dorigo, Wouter ; Scanlon, Tracy ; Preimesberger, Wolfgang ; Madelon, Rémi ; de Jeu, Richard</creator><creatorcontrib>van der Schalie, Robin ; van der Vliet, Mendy ; Rodríguez-Fernández, Nemesio ; Dorigo, Wouter ; Scanlon, Tracy ; Preimesberger, Wolfgang ; Madelon, Rémi ; de Jeu, Richard</creatorcontrib><description>The CCI Soil Moisture dataset (CCI SM) is the most extensive climate data record of satellite soil moisture to date. To maximize its function as a climate benchmark, both long-term consistency and (model-) independence are high priorities. Two unique L-band missions integrated into the CCI SM are SMOS and SMAP. However, they lack the high-frequency microwave sensors needed to determine the effective temperature and snow/frozen flagging, and therefore use input from (varying) land surface models. In this study, the impact of replacing this model input by temperature and filtering based on passive microwave observations is evaluated. This is derived from an inter-calibrated dataset (ICTB) based on six passive microwave sensors. Generally, this leads to an expected increase in revisit time, which goes up by about 0.5 days (~15% loss). Only the boreal regions have an increased coverage due to more accurate freeze/thaw detection. The boreal regions become wetter with an increased dynamic range, while the tropics are dryer with decreased dynamics. Other regions show only small differences. The skill was evaluated against ERA5-Land and in situ observations. The average correlation against ERA5-Land increased by 0.05 for SMAP ascending/descending and SMOS ascending, whereas SMOS descending decreased by 0.01. For in situ sensors, the difference is less pronounced, with only a significant change in correlation of 0.04 for SM SMOS ascending. The results indicate that the use of microwave-based input for temperature and filtering is a viable and preferred alternative to the use of land surface models in soil moisture climate data records from passive microwave sensors.</description><identifier>ISSN: 2072-4292</identifier><identifier>EISSN: 2072-4292</identifier><identifier>DOI: 10.3390/rs13132480</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Algorithms ; Calibration ; Climate change ; Climate models ; Climatic data ; Continental interfaces, environment ; Datasets ; effective temperature ; Filtration ; Freeze-thawing ; LPRM ; Microwave sensors ; passive microwave radiometry ; Radiometers ; Remote sensing ; Satellites ; Sciences of the Universe ; Sensors ; SMAP ; SMOS ; Soil moisture ; Soil temperature ; Temperature ; Tropical environments ; Vegetation</subject><ispartof>Remote sensing (Basel, Switzerland), 2021-07, Vol.13 (13), p.2480</ispartof><rights>2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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Only the boreal regions have an increased coverage due to more accurate freeze/thaw detection. The boreal regions become wetter with an increased dynamic range, while the tropics are dryer with decreased dynamics. Other regions show only small differences. The skill was evaluated against ERA5-Land and in situ observations. The average correlation against ERA5-Land increased by 0.05 for SMAP ascending/descending and SMOS ascending, whereas SMOS descending decreased by 0.01. For in situ sensors, the difference is less pronounced, with only a significant change in correlation of 0.04 for SM SMOS ascending. The results indicate that the use of microwave-based input for temperature and filtering is a viable and preferred alternative to the use of land surface models in soil moisture climate data records from passive microwave sensors.</description><subject>Algorithms</subject><subject>Calibration</subject><subject>Climate change</subject><subject>Climate models</subject><subject>Climatic data</subject><subject>Continental interfaces, environment</subject><subject>Datasets</subject><subject>effective temperature</subject><subject>Filtration</subject><subject>Freeze-thawing</subject><subject>LPRM</subject><subject>Microwave sensors</subject><subject>passive microwave radiometry</subject><subject>Radiometers</subject><subject>Remote sensing</subject><subject>Satellites</subject><subject>Sciences of the Universe</subject><subject>Sensors</subject><subject>SMAP</subject><subject>SMOS</subject><subject>Soil moisture</subject><subject>Soil temperature</subject><subject>Temperature</subject><subject>Tropical environments</subject><subject>Vegetation</subject><issn>2072-4292</issn><issn>2072-4292</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>DOA</sourceid><recordid>eNpVkU1v3CAQQK2qkRqlufQXIPXUSk6BAdsck23TrLRRpHZ7RmMzTlk5ZgvsVjnlr5fNVv3gMIxGjzfAVNUbwS8ADP8QkwABUnX8RXUqeStrJY18-U_-qjpPacPLAhCGq9PqaVVf4ezY1-Andht8yrtI7Avl6GmPU2Lfkp_v2a0fYviJe2JXmMixNT1sKeIzfDh-7adMsZAXbF246FKROZrq5exoSyXMmS0m_4CZ2EfMWFoMoWCvq5OxtKHz3_tZtb7-tF7c1Ku7z8vF5aoewOhckzZqbDVgBz1CI5zrm8EguB6AVAMt19hL6kYn2lZ3zdiNimQ79noQ2BCcVcuj1gXc2G0sF4mPNqC3z4UQ7y3G7IeJbD-2pleNOESFhvdSNnwgOZAwhBqL693R9R2n_1Q3lyt7qHHVGi6F3ovCvj2y2xh-7Chluwm7OJeXWqmVaWQnOijU-yNVPjmlSOMfreD2MFr7d7TwC9K0lb0</recordid><startdate>20210701</startdate><enddate>20210701</enddate><creator>van der Schalie, Robin</creator><creator>van der Vliet, Mendy</creator><creator>Rodríguez-Fernández, Nemesio</creator><creator>Dorigo, Wouter</creator><creator>Scanlon, Tracy</creator><creator>Preimesberger, Wolfgang</creator><creator>Madelon, Rémi</creator><creator>de Jeu, Richard</creator><general>MDPI AG</general><general>MDPI</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>7QO</scope><scope>7QQ</scope><scope>7QR</scope><scope>7SC</scope><scope>7SE</scope><scope>7SN</scope><scope>7SP</scope><scope>7SR</scope><scope>7TA</scope><scope>7TB</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F28</scope><scope>FR3</scope><scope>H8D</scope><scope>H8G</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>JQ2</scope><scope>KR7</scope><scope>L6V</scope><scope>L7M</scope><scope>L~C</scope><scope>L~D</scope><scope>M7S</scope><scope>P5Z</scope><scope>P62</scope><scope>P64</scope><scope>PCBAR</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>1XC</scope><scope>VOOES</scope><scope>DOA</scope><orcidid>https://orcid.org/0000-0003-1697-8321</orcidid><orcidid>https://orcid.org/0000-0002-6655-0588</orcidid><orcidid>https://orcid.org/0000-0003-3796-149X</orcidid></search><sort><creationdate>20210701</creationdate><title>L-Band Soil Moisture Retrievals Using Microwave Based Temperature and Filtering. 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Towards Model-Independent Climate Data Records</atitle><jtitle>Remote sensing (Basel, Switzerland)</jtitle><date>2021-07-01</date><risdate>2021</risdate><volume>13</volume><issue>13</issue><spage>2480</spage><pages>2480-</pages><issn>2072-4292</issn><eissn>2072-4292</eissn><abstract>The CCI Soil Moisture dataset (CCI SM) is the most extensive climate data record of satellite soil moisture to date. To maximize its function as a climate benchmark, both long-term consistency and (model-) independence are high priorities. Two unique L-band missions integrated into the CCI SM are SMOS and SMAP. However, they lack the high-frequency microwave sensors needed to determine the effective temperature and snow/frozen flagging, and therefore use input from (varying) land surface models. In this study, the impact of replacing this model input by temperature and filtering based on passive microwave observations is evaluated. This is derived from an inter-calibrated dataset (ICTB) based on six passive microwave sensors. Generally, this leads to an expected increase in revisit time, which goes up by about 0.5 days (~15% loss). Only the boreal regions have an increased coverage due to more accurate freeze/thaw detection. The boreal regions become wetter with an increased dynamic range, while the tropics are dryer with decreased dynamics. Other regions show only small differences. The skill was evaluated against ERA5-Land and in situ observations. The average correlation against ERA5-Land increased by 0.05 for SMAP ascending/descending and SMOS ascending, whereas SMOS descending decreased by 0.01. For in situ sensors, the difference is less pronounced, with only a significant change in correlation of 0.04 for SM SMOS ascending. 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subjects | Algorithms Calibration Climate change Climate models Climatic data Continental interfaces, environment Datasets effective temperature Filtration Freeze-thawing LPRM Microwave sensors passive microwave radiometry Radiometers Remote sensing Satellites Sciences of the Universe Sensors SMAP SMOS Soil moisture Soil temperature Temperature Tropical environments Vegetation |
title | L-Band Soil Moisture Retrievals Using Microwave Based Temperature and Filtering. Towards Model-Independent Climate Data Records |
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