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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2020-180
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-180
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  11 Jun 2020

11 Jun 2020

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A revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Retrieved wind speed from the Orbiting Carbon Observatory-2

Robert R. Nelson1, Annmarie Eldering1, David Crisp1, Aronne J. Merrelli2, and Christopher W. O'Dell3 Robert R. Nelson et al.
  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
  • 2Space Science and Engineering Center, University of Wisconsin-Madison, Madison, WI, USA
  • 3Cooperative Institute for Research in the Atmosphere, Fort Collins, Colorado, USA

Abstract. Satellite measurements of surface wind speed over the ocean inform a wide variety of scientific pursuits. While both active and passive microwave sensors are traditionally used to detect surface wind speed over water surfaces, measurements of reflected sunlight in the near-infrared made by the Orbiting Carbon Observatory-2 (OCO-2) are also sensitive to the wind speed. In this work, retrieved wind speeds from OCO-2 glint measurements are validated against the Advanced Microwave Scanning Radiometer-2 (AMSR2). Both sensors are in the international Afternoon Constellation, allowing for a large number of co-located observations. Several different OCO-2 retrieval algorithm modifications are tested, with the most successful being a single-band Cox-Munk-only model. Using this, we find excellent agreement between the two sensors, with OCO-2 having a small mean low bias against AMSR2 of −0.22 m/s, an RMSD of 0.75 m/s, and a correlation coefficient of 0.94. Although OCO-2 is restricted to clear-sky measurements, potential benefits of its higher spatial resolution relative to microwave instruments include the study of coastal wind processes, which may be able to inform certain economic sectors.

Robert R. Nelson et al.

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Robert R. Nelson et al.

Robert R. Nelson et al.

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Latest update: 27 Nov 2020
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Short summary
Measurements of surface wind speed over oceans are scientifically useful. Here we show that the Orbiting Carbon Observatory-2 (OCO-2), originally designed to measure carbon dioxide using reflected sunlight, can also accurately and precisely measure wind speed. OCO-2's high spatial resolution means that it can observe close to coastlines and therefore be used to study coastal wind processes and inform related economic sectors.
Measurements of surface wind speed over oceans are scientifically useful. Here we show that the...
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