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1. Corrigendum: Ocean surface radiation measurement best practices

Author

Laura D. Riihimaki, Meghan F. Cronin, Raja Acharya, Nathan Anderson, John A. Augustine, Kelly A. Balmes, Patrick Berk, Roberto Bozzano, Anthony Bucholtz, Kenneth J. Connell, Christopher J. Cox, Alcide G. di Sarra, James Edson, C.W. Fairall, J. Thomas Farrar, Karen Grissom, Maria Teresa Guerra, Verena Hormann, K Jossia Joseph, Christian Lanconelli, Frederic Melin, Daniela Meloni, Matteo Ottaviani, Sara Pensieri, K. Ramesh, David Rutan, Nikiforos Samarinas, Shawn R. Smith, Sebastiaan Swart, Amit Tandon, Elizabeth J. Thompson, R. Venkatesan, Raj Kumar Verma, Vito Vitale, Katie S. Watkins-Brandt, Robert A. Weller, Christopher J. Zappa, and Dongxiao Zhang

Subjects
ocean radiation, radiometer, best practices, surface radiation budget, ocean surface heat flux, OASIS, Science, General. Including nature conservation, geographical distribution, QH1-199.5
Published
2024
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2. Ocean surface radiation measurement best practices

Author

Laura D. Riihimaki, Meghan F. Cronin, Raja Acharya, Nathan Anderson, John A. Augustine, Kelly A. Balmes, Patrick Berk, Roberto Bozzano, Anthony Bucholtz, Kenneth J. Connell, Christopher J. Cox, Alcide G. di Sarra, James Edson, C. W. Fairall, J. Thomas Farrar, Karen Grissom, Maria Teresa Guerra, Verena Hormann, K Jossia Joseph, Christian Lanconelli, Frederic Melin, Daniela Meloni, Matteo Ottaviani, Sara Pensieri, K. Ramesh, David Rutan, Nikiforos Samarinas, Shawn R. Smith, Sebastiaan Swart, Amit Tandon, Elizabeth J. Thompson, R. Venkatesan, Raj Kumar Verma, Vito Vitale, Katie S. Watkins-Brandt, Robert A. Weller, Christopher J. Zappa, and Dongxiao Zhang

Subjects
ocean radiation, radiometer, best practices, surface radiation budget, ocean surface heat flux, OASIS, Science, General. Including nature conservation, geographical distribution, QH1-199.5
Abstract

Ocean surface radiation measurement best practices have been developed as a first step to support the interoperability of radiation measurements across multiple ocean platforms and between land and ocean networks. This document describes the consensus by a working group of radiation measurement experts from land, ocean, and aircraft communities. The scope was limited to broadband shortwave (solar) and longwave (terrestrial infrared) surface irradiance measurements for quantification of the surface radiation budget. Best practices for spectral measurements for biological purposes like photosynthetically active radiation and ocean color are only mentioned briefly to motivate future interactions between the physical surface flux and biological radiation measurement communities. Topics discussed in these best practices include instrument selection, handling of sensors and installation, data quality monitoring, data processing, and calibration. It is recognized that platform and resource limitations may prohibit incorporating all best practices into all measurements and that spatial coverage is also an important motivator for expanding current networks. Thus, one of the key recommendations is to perform interoperability experiments that can help quantify the uncertainty of different practices and lay the groundwork for a multi-tiered global network with a mix of high-accuracy reference stations and lower-cost platforms and practices that can fill in spatial gaps.

Published
2024
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3. Additional Characterization of Dome-C to Improve its Use as an Invariant Visible Calibration Target

Author

David R Doelling, Rajendra Bhatt, Benjamin R Scarino, Arun Gopalan, David Rutan, Ryan Scott, and Conor O Haney

Subjects
Instrumentation And Photography
Abstract

Dome-C is a recommended CEOS invariant target that has been utilized by the calibration community for several decades for monitoring onboard sensor calibration systems as well radiometric inter-comparisons. Dome-C is a high-altitude Earth target located on the East Antarctic interior plateau, which has a permanent bright, flat, and homogeneous snow-covered surface with little aerosol, cloud cover, snowfall, and water vapor burden. This paper describes angular directional models for characterizing the Dome-C top-of-atmosphere (TOA)radiances as a function of cosine solar zenith angle for pre-solstice and post-solstice conditions. The 0.86-μm channel Dome-C reflectance decreases over the summer due to snow metamorphosisis not observed by the visible channels. Coinciding Terra and AquaMODIS Dome-C reflectance showed occasional inter-annual anomalies when compared against the deep convective cloud and Libya-4 invariant targets observations. Further characterization of the Dome-C reflectances with the Dome-C surface broadband albedo, Antarctic Oscillation(AAO) index, and ozone concentration values were evaluated. A strong correlation with ozone was found for the 0.55-μm and 0.65-μm MODIS channels. The monthly Dome-C reflectances were linearly regressed with ozone to derive the ozone correction coefficients. The uncertainty in the Aqua-and Terra-MODIS Dome-C trends was reduced by half after applying ozone corrections to both the 0.55-μm and 0.65-μm channelTOA observations.

Published
2021

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