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Arctic Surface Properties and Their Impact on Microwave Satellite Water Vapor Column Retrievals.

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Title: Arctic Surface Properties and Their Impact on Microwave Satellite Water Vapor Column Retrievals.
Authors: Perro, Christopher1 christopher.perro@gmail.com, Duck, Thomas J.1 tduck@dal.ca, Lesins, Glen1 glen.lesins@dal.ca, Strong, Kimberly2 strong@atmosp.physics.utoronto.ca, Drummond, James R.1 james.drummond@dal.ca
Source: IEEE Transactions on Geoscience & Remote Sensing. Dec2020, Vol. 58 Issue 12, p8332-8344. 13p.
Subjects: Water vapor, Surface properties, Sea ice, Microwaves, Microwave measurements, Microsoft Surface, Emissivity
Abstract: Wintertime Arctic surface emissivities are retrieved from Advanced Technology Microwave Sounder (ATMS) passive microwave measurements at 88.2, 165.5, and 183.31 GHz. Surface emitting layer temperatures are simultaneously retrieved at 183.31 GHz. Random errors in emissivities are estimated to be 2.0%, 2.0%, and 3.5% at 88.2, 165.5, and 183.31 GHz, respectively, and the random errors in surface emitting layer temperatures are 4.3 K. A series of tests on the retrieved products reveal that land and sea ice are Lambertian reflectors and ocean is a specular reflector. The retrieved emissivities show broad agreement with products from published databases, with differences partly due to the uncertainties in surface emitting layer temperatures. The geographical distribution of 165.5/183.31 GHz surface reflectance ratios over land and sea ice, which is important for the retrieval of microwave satellite water vapor column (WVC), is presented. Neglecting the geographical variations leads to random errors in retrieved wintertime Arctic WVCs of approximately 1.8% and 25% in the mid (1.5 – 9 kgm−2) and extended (8 – 15 kgm−2) slant column retrieval regimes, respectively. Choosing specular instead of Lambertian reflection in the surface emissivity retrievals over land and sea ice causes systematic WVC retrieval errors of up to −4.1%. [ABSTRACT FROM AUTHOR]
Copyright of IEEE Transactions on Geoscience & Remote Sensing is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Items – Name: Title
  Label: Title
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  Data: Arctic Surface Properties and Their Impact on Microwave Satellite Water Vapor Column Retrievals.
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  Data: <searchLink fieldCode="AR" term="%22Perro%2C+Christopher%22">Perro, Christopher</searchLink><relatesTo>1</relatesTo><i> christopher.perro@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Duck%2C+Thomas+J%2E%22">Duck, Thomas J.</searchLink><relatesTo>1</relatesTo><i> tduck@dal.ca</i><br /><searchLink fieldCode="AR" term="%22Lesins%2C+Glen%22">Lesins, Glen</searchLink><relatesTo>1</relatesTo><i> glen.lesins@dal.ca</i><br /><searchLink fieldCode="AR" term="%22Strong%2C+Kimberly%22">Strong, Kimberly</searchLink><relatesTo>2</relatesTo><i> strong@atmosp.physics.utoronto.ca</i><br /><searchLink fieldCode="AR" term="%22Drummond%2C+James+R%2E%22">Drummond, James R.</searchLink><relatesTo>1</relatesTo><i> james.drummond@dal.ca</i>
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  Data: <searchLink fieldCode="JN" term="%22IEEE+Transactions+on+Geoscience+%26+Remote+Sensing%22">IEEE Transactions on Geoscience & Remote Sensing</searchLink>. Dec2020, Vol. 58 Issue 12, p8332-8344. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Water+vapor%22">Water vapor</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+properties%22">Surface properties</searchLink><br /><searchLink fieldCode="DE" term="%22Sea+ice%22">Sea ice</searchLink><br /><searchLink fieldCode="DE" term="%22Microwaves%22">Microwaves</searchLink><br /><searchLink fieldCode="DE" term="%22Microwave+measurements%22">Microwave measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Microsoft+Surface%22">Microsoft Surface</searchLink><br /><searchLink fieldCode="DE" term="%22Emissivity%22">Emissivity</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Wintertime Arctic surface emissivities are retrieved from Advanced Technology Microwave Sounder (ATMS) passive microwave measurements at 88.2, 165.5, and 183.31 GHz. Surface emitting layer temperatures are simultaneously retrieved at 183.31 GHz. Random errors in emissivities are estimated to be 2.0%, 2.0%, and 3.5% at 88.2, 165.5, and 183.31 GHz, respectively, and the random errors in surface emitting layer temperatures are 4.3 K. A series of tests on the retrieved products reveal that land and sea ice are Lambertian reflectors and ocean is a specular reflector. The retrieved emissivities show broad agreement with products from published databases, with differences partly due to the uncertainties in surface emitting layer temperatures. The geographical distribution of 165.5/183.31 GHz surface reflectance ratios over land and sea ice, which is important for the retrieval of microwave satellite water vapor column (WVC), is presented. Neglecting the geographical variations leads to random errors in retrieved wintertime Arctic WVCs of approximately 1.8% and 25% in the mid (1.5 – 9 kgm−2) and extended (8 – 15 kgm−2) slant column retrieval regimes, respectively. Choosing specular instead of Lambertian reflection in the surface emissivity retrievals over land and sea ice causes systematic WVC retrieval errors of up to −4.1%. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of IEEE Transactions on Geoscience & Remote Sensing is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1109/TGRS.2020.2986302
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        Text: English
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        PageCount: 13
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      – SubjectFull: Sea ice
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      – SubjectFull: Microwave measurements
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      – SubjectFull: Microsoft Surface
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      – SubjectFull: Emissivity
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      – TitleFull: Arctic Surface Properties and Their Impact on Microwave Satellite Water Vapor Column Retrievals.
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              Text: Dec2020
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