The CHROMA cloud top pressure retrieval algorithm for the Plankton, Aerosol, Cloud, ocean Ecosytem (PACE) satellite mission

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dc.contributor.authorSayer, Andrew
dc.contributor.authorLelli, Luca
dc.contributor.authorCairns, Brian
dc.contributor.authorDiedenhoven, Bastiaan van
dc.contributor.authorIbrahim, Amir
dc.contributor.authorKnobelspiesse, Kirk D.
dc.contributor.authorKorkin, Sergey
dc.contributor.authorWerdell, P. Jeremy
dc.date.accessioned2022-11-28T16:23:42Z
dc.date.available2022-11-28T16:23:42Z
dc.date.issued2023-02-23
dc.description.abstractThis paper provides the theoretical basis and simulated retrievals for the Cloud Height Retrieval from O2 Molecular Absorption (CHROMA) algorithm. Simulations are performed for the Ocean Color Instrument (OCI), which is the primary payload on the forthcoming NASA Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission, and the Ocean Land Colour Instrument (OLCI) currently flying on the Sentinel 3 satellites. CHROMA is a Bayesian approach which simultaneously retrieves cloud optical thickness (COT), cloud top pressure/height (CTP/CTH), and (with a significant prior constraint) surface albedo. Simulated retrievals suggest that the sensor and algorithm should be able to meet the PACE mission goal for CTP error, which is ±60 mb for 65 % of opaque (COT≥ 3) single-layer clouds on global average. CHROMA will provide pixel-level uncertainty estimates, which are demonstrated to have skill at telling low-error situations from high-error ones. CTP uncertainty estimates are well-calibrated in magnitude, although COT uncertainty is overestimated relative to observed errors. OLCI performance is found to be slightly better than OCI overall, demonstrating that it is a suitable proxy for the latter in advance of PACE’s launch. CTP error is only weakly sensitive to correct cloud phase identification or assumed ice crystal habit/roughness. As with other similar algorithms, for simulated retrievals of multi-layer systems consisting of optically thin cirrus clouds above liquid clouds, retrieved height tends to be underestimated because the satellite signal is dominated by the optically-thicker lower layer. Total (liquid plus ice) COT also becomes underestimated in these situations. However, retrieved CTP becomes closer to that of the upper ice layer for ice COT≈3 or higher.en_US
dc.description.sponsorshipLL was funded by the Alexander von Humboldt foundation via the Feodor-Lynen fellowship 2020. BvD was funded by SRON. All other authors were funded by the NASA PACE project. The authors are grateful to J. Elsey (University of Reading, UK), I. Gordon (Harvard University, USA), V. Natraj (JPL, USA), and K. P. Shine (University of Reading, UK) for useful discussions on modeling 690 the O2 A-band and continuum absorption. AMS thanks A. B. Davis (JPL) for interesting historical discussion on O2 remote sensing, and J. M. Gales (SAIC) for assistance with cluster computing. The developers of the libRadtran software, HITRAN data base, and MT_CKD continuum model are deeply appreciated for these powerful, freely-available tools.en_US
dc.description.urihttps://amt.copernicus.org/articles/16/969/2023/en_US
dc.format.extent28 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2vplg-oxqf
dc.identifier.citationSayer, A. M., Lelli, L., Cairns, B., van Diedenhoven, B., Ibrahim, A., Knobelspiesse, K. D., Korkin, S., and Werdell, P. J.: The CHROMA cloud-top pressure retrieval algorithm for the Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) satellite mission, Atmos. Meas. Tech., 16, 969–996, https://doi.org/10.5194/amt-16-969-2023, 2023.en_US
dc.identifier.urihttps://doi.org/10.5194/amt-16-969-2023
dc.identifier.urihttp://hdl.handle.net/11603/26362
dc.language.isoen_USen_US
dc.publisherEGU
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC GESTAR II Collection
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleThe CHROMA cloud top pressure retrieval algorithm for the Plankton, Aerosol, Cloud, ocean Ecosytem (PACE) satellite missionen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0001-9149-1789en_US
dcterms.creatorhttps://orcid.org/0000-0003-4690-3232en_US

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