气候变化领域集成服务门户(CCPortal): OCO-3 early mission operations and initial (vEarly) XCO2 and SIF retrievals

CCPortal

DOI	10.1016/j.rse.2020.112032
	OCO-3 early mission operations and initial (vEarly) XCO2 and SIF retrievals
	Taylor T.E.; Eldering A.; Merrelli A.; Kiel M.; Somkuti P.; Cheng C.; Rosenberg R.; Fisher B.; Crisp D.; Basilio R.; Bennett M.; Cervantes D.; Chang A.; Dang L.; Frankenberg C.; Haemmerle V.R.; Keller G.R.; Kurosu T.; Laughner J.L.; Lee R.; Marchetti Y.; Nelson R.R.; O'Dell C.W.; Osterman G.; Pavlick R.; Roehl C.; Schneider R.; Spiers G.; To C.; Wells C.; Wennberg P.O.; Yelamanchili A.; Yu S.
发表日期	2020
ISSN	00344257
卷号	251
英文摘要	NASA's Orbiting Carbon Observatory-3 (OCO-3) was installed on the International Space Station (ISS) on 10 May 2019. OCO-3 combines the flight spare spectrometer from the Orbiting Carbon Observatory-2 (OCO-2) mission, which has been in operation since 2014, with a new Pointing Mirror Assembly (PMA) that facilitates observations of non-nadir targets from the nadir-oriented ISS platform. The PMA is a new feature of OCO-3, which is being used to collect data in all science modes, including nadir (ND), sun-glint (GL), target (TG), and the new snapshot area mapping (SAM) mode. This work provides an initial assessment of the OCO-3 instrument and algorithm performance, highlighting results from the first 8 months of operations spanning August 2019 through March 2020. During the In-Orbit Checkout (IOC) phase, critical systems such as power and cooling were verified, after which the OCO-3 spectrometer and PMA were subjected to a series of rigorous tests. First light of the OCO-3 spectrometer was on 26 June 2019, with full science operations beginning on 6 August 2019. The OCO-3 spectrometer on-orbit performance is consistent with that seen during preflight testing. Signal to noise ratios are in the expected range needed for high quality retrievals of the column-averaged carbon dioxide (CO2) dry-air mole fraction (XCO2) and solar-induced chlorophyll fluorescence (SIF), which will be used to help quantify and constrain the global carbon cycle. The first public release of OCO-3 Level 2 (L2) data products, called “vEarly”, is being distributed by NASA's Goddard Earth Sciences Data and Information Services Center (GES DISC). The intent of the vEarly product is to evaluate early mission performance, facilitate comparisons with OCO-2 products, and identify key areas to improve for the next data release. The vEarly XCO2 exhibits a root-mean-squared-error (RMSE) of ≃ 1, 1, 2 ppm versus a truth proxy for nadir-land, TG&SAM, and glint-water observations, respectively. The vEarly SIF shows a correlation with OCO-2 measurements of >0.9 for highly coincident soundings. Overall, the Level 2 SIF and XCO2 products look very promising, with performance comparable to OCO-2. A follow-on version of the OCO-3 L2 product containing a number of refinements, e.g., instrument calibration, pointing accuracy, and retrieval algorithm tuning, is anticipated by early in 2021. © 2020 The Author(s)
英文关键词	Calibration; Carbon dioxide; Greenhouse gases; ISS; OCO-2; OCO-3; Solar-induced chlorophyll fluorescence
语种	英语
scopus关键词	Carbon dioxide; Cooling systems; Indium compounds; Information services; Mean square error; NASA; Observatories; Signal to noise ratio; Space stations; Spectrometers; Algorithm performance; Chlorophyll fluorescence; Instrument calibrations; International Space stations; On-orbit performance; Pointing mirror assemblies; Retrieval algorithms; Root mean squared errors; Orbits; carbon dioxide; chlorophyll; cooling; data quality; fluorescence; information management; nadir; OCO; operations technology; solar radiation; spectrometer
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179129
作者单位	Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO 80521, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States; Space Science and Engineering Center, University of Wisconsin - Madison, Madison, WI 53706, United States; California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Taylor T.E.,Eldering A.,Merrelli A.,et al. OCO-3 early mission operations and initial (vEarly) XCO2 and SIF retrievals[J],2020,251.
APA	Taylor T.E..,Eldering A..,Merrelli A..,Kiel M..,Somkuti P..,...&Yu S..(2020).OCO-3 early mission operations and initial (vEarly) XCO2 and SIF retrievals.Remote Sensing of Environment,251.
MLA	Taylor T.E.,et al."OCO-3 early mission operations and initial (vEarly) XCO2 and SIF retrievals".Remote Sensing of Environment 251(2020).