The Influence of Thermal Properties and Canopy- Intercepted Snow on Passive Microwave Transmissivity of a Scots Pine
While many microwave studies related to tree emission have been undertaken, a few have considered the effect of phenological change on the emission from coniferous trees. The permittivity of vegetation tissue is known to be influenced by water content, while the water content and phase is sensitive...
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| Veröffentlicht in: | IEEE transactions on geoscience and remote sensing 2019-08, Vol.57 (8), p.5424-5433 |
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| creator | Li, Qinghuan Kelly, Richard Leppanen, Leena Vehvilainen, Juho Kontu, Anna Lemmetyinen, Juha Pulliainen, Jouni |
| description | While many microwave studies related to tree emission have been undertaken, a few have considered the effect of phenological change on the emission from coniferous trees. The permittivity of vegetation tissue is known to be influenced by water content, while the water content and phase is sensitive to temperature in particular at temperatures below freezing. In addition to temperature, canopy-intercepted snow might also modify the tree emission and transmissivity in the microwave range. In this paper, a season-long experiment was designed to quantify the effect of snow accumulation and temperature on the observed microwave transmissivity from tree. A ground-based, upward-pointing multifrequency radiometer was used to monitor the microwave emissivity of a single coniferous tree at a site in Northern Finland. Radiometer measurements were combined with measurements of the canopy-intercepted snow cover and tree skin temperature. This paper presents two important findings. First, the tree transmissivity was strongly correlated with tree skin temperature under subzero temperature conditions, but uncorrelated with skin temperature changes above freezing. Second, although the tree transmissivity was slightly affected by the snow accumulation on the tree canopy, the overall influence on tree emission was statistically insignificant in this paper. |
| doi_str_mv | 10.1109/TGRS.2019.2899345 |
| format | Article |
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The permittivity of vegetation tissue is known to be influenced by water content, while the water content and phase is sensitive to temperature in particular at temperatures below freezing. In addition to temperature, canopy-intercepted snow might also modify the tree emission and transmissivity in the microwave range. In this paper, a season-long experiment was designed to quantify the effect of snow accumulation and temperature on the observed microwave transmissivity from tree. A ground-based, upward-pointing multifrequency radiometer was used to monitor the microwave emissivity of a single coniferous tree at a site in Northern Finland. Radiometer measurements were combined with measurements of the canopy-intercepted snow cover and tree skin temperature. This paper presents two important findings. First, the tree transmissivity was strongly correlated with tree skin temperature under subzero temperature conditions, but uncorrelated with skin temperature changes above freezing. Second, although the tree transmissivity was slightly affected by the snow accumulation on the tree canopy, the overall influence on tree emission was statistically insignificant in this paper.</description><identifier>ISSN: 0196-2892</identifier><identifier>EISSN: 1558-0644</identifier><identifier>DOI: 10.1109/TGRS.2019.2899345</identifier><identifier>CODEN: IGRSD2</identifier><language>eng</language><publisher>New York: IEEE</publisher><subject>Accumulation ; Canopies ; Canopy ; Canopy-intercepted snow ; Coniferous trees ; Emission analysis ; Emissivity ; Forestry ; Freezing ; Microwave FET integrated circuits ; Microwave measurement ; Microwave radiometry ; Moisture content ; Radiometers ; Skin ; Skin temperature ; Snow ; Snow accumulation ; Snow cover ; Subzero temperature ; Temperature ; Temperature effects ; Temperature measurement ; Thermal properties ; Thermodynamic properties ; Tissue ; Transmissivity ; tree ; Vegetation ; Water content</subject><ispartof>IEEE transactions on geoscience and remote sensing, 2019-08, Vol.57 (8), p.5424-5433</ispartof><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2019</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c293t-541e28da2754d4187c2d1679de1144ac12551677d0fb55706ed17b91d73eb0af3</citedby><cites>FETCH-LOGICAL-c293t-541e28da2754d4187c2d1679de1144ac12551677d0fb55706ed17b91d73eb0af3</cites><orcidid>0000-0003-1157-2920 ; 0000-0002-9220-7556 ; 0000-0003-1605-8306 ; 0000-0001-7521-8512 ; 0000-0001-6880-6260 ; 0000-0001-8076-7604 ; 0000-0003-4434-9696</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/8671455$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>314,776,780,792,27903,27904,54736</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/8671455$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc></links><search><creatorcontrib>Li, Qinghuan</creatorcontrib><creatorcontrib>Kelly, Richard</creatorcontrib><creatorcontrib>Leppanen, Leena</creatorcontrib><creatorcontrib>Vehvilainen, Juho</creatorcontrib><creatorcontrib>Kontu, Anna</creatorcontrib><creatorcontrib>Lemmetyinen, Juha</creatorcontrib><creatorcontrib>Pulliainen, Jouni</creatorcontrib><title>The Influence of Thermal Properties and Canopy- Intercepted Snow on Passive Microwave Transmissivity of a Scots Pine</title><title>IEEE transactions on geoscience and remote sensing</title><addtitle>TGRS</addtitle><description>While many microwave studies related to tree emission have been undertaken, a few have considered the effect of phenological change on the emission from coniferous trees. The permittivity of vegetation tissue is known to be influenced by water content, while the water content and phase is sensitive to temperature in particular at temperatures below freezing. In addition to temperature, canopy-intercepted snow might also modify the tree emission and transmissivity in the microwave range. In this paper, a season-long experiment was designed to quantify the effect of snow accumulation and temperature on the observed microwave transmissivity from tree. A ground-based, upward-pointing multifrequency radiometer was used to monitor the microwave emissivity of a single coniferous tree at a site in Northern Finland. Radiometer measurements were combined with measurements of the canopy-intercepted snow cover and tree skin temperature. This paper presents two important findings. First, the tree transmissivity was strongly correlated with tree skin temperature under subzero temperature conditions, but uncorrelated with skin temperature changes above freezing. Second, although the tree transmissivity was slightly affected by the snow accumulation on the tree canopy, the overall influence on tree emission was statistically insignificant in this paper.</description><subject>Accumulation</subject><subject>Canopies</subject><subject>Canopy</subject><subject>Canopy-intercepted snow</subject><subject>Coniferous trees</subject><subject>Emission analysis</subject><subject>Emissivity</subject><subject>Forestry</subject><subject>Freezing</subject><subject>Microwave FET integrated circuits</subject><subject>Microwave measurement</subject><subject>Microwave radiometry</subject><subject>Moisture content</subject><subject>Radiometers</subject><subject>Skin</subject><subject>Skin temperature</subject><subject>Snow</subject><subject>Snow accumulation</subject><subject>Snow cover</subject><subject>Subzero temperature</subject><subject>Temperature</subject><subject>Temperature effects</subject><subject>Temperature measurement</subject><subject>Thermal properties</subject><subject>Thermodynamic properties</subject><subject>Tissue</subject><subject>Transmissivity</subject><subject>tree</subject><subject>Vegetation</subject><subject>Water content</subject><issn>0196-2892</issn><issn>1558-0644</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNo9kF1LwzAUhoMoOKc_QLwJeN2ZkyZNeylD52DicPW6ZM0pdmxJTTrH_r0pG16dr_e85_AQcg9sAsCKp3L2uZpwBsWE50WRCnlBRiBlnrBMiEsyipMsiSN-TW5C2DAGQoIakb78Rjq3zXaPtkbqGhobfqe3dOldh75vMVBtDZ1q67pjErU9-hq7Hg1dWXegztKlDqH9Rfre1t4ddMxKr23YtUO77Y-Draar2vWBLluLt-Sq0duAd-c4Jl-vL-X0LVl8zObT50VS8yLtEykAeW40V1IYAbmquYFMFQYBhNA1cCljrQxr1lIqlqEBtS7AqBTXTDfpmDyefDvvfvYY-mrj9t7GkxXnGfCsyIFFFZxU8fkQPDZV59ud9scKWDXArQa41QC3OsONOw-nnRYR__V5piJWmf4B93t1-A</recordid><startdate>20190801</startdate><enddate>20190801</enddate><creator>Li, Qinghuan</creator><creator>Kelly, Richard</creator><creator>Leppanen, Leena</creator><creator>Vehvilainen, Juho</creator><creator>Kontu, Anna</creator><creator>Lemmetyinen, Juha</creator><creator>Pulliainen, Jouni</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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Second, although the tree transmissivity was slightly affected by the snow accumulation on the tree canopy, the overall influence on tree emission was statistically insignificant in this paper.</abstract><cop>New York</cop><pub>IEEE</pub><doi>10.1109/TGRS.2019.2899345</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0003-1157-2920</orcidid><orcidid>https://orcid.org/0000-0002-9220-7556</orcidid><orcidid>https://orcid.org/0000-0003-1605-8306</orcidid><orcidid>https://orcid.org/0000-0001-7521-8512</orcidid><orcidid>https://orcid.org/0000-0001-6880-6260</orcidid><orcidid>https://orcid.org/0000-0001-8076-7604</orcidid><orcidid>https://orcid.org/0000-0003-4434-9696</orcidid></addata></record> |
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| subjects | Accumulation Canopies Canopy Canopy-intercepted snow Coniferous trees Emission analysis Emissivity Forestry Freezing Microwave FET integrated circuits Microwave measurement Microwave radiometry Moisture content Radiometers Skin Skin temperature Snow Snow accumulation Snow cover Subzero temperature Temperature Temperature effects Temperature measurement Thermal properties Thermodynamic properties Tissue Transmissivity tree Vegetation Water content |
| title | The Influence of Thermal Properties and Canopy- Intercepted Snow on Passive Microwave Transmissivity of a Scots Pine |
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