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DOI | 10.1002/2017JD026561 |
The OCO-2 oxygen A-band response to liquid marine cloud properties from CALIPSO and MODIS | |
Richardson, Mark1; McDuffie, James1; Stephens, Graeme L.1,2; Cronk, Heather Q.3; Taylor, Tommy E.3 | |
2017-08-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:15 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England |
英文摘要 | Spectra of reflected sunlight in the oxygen A-band contain information about cloud properties such as cloud top pressure, optical depth, and pressure thickness. Here we show, for the first time, that high-spectral-resolution A-band Orbiting Carbon Observatory-2 (OCO-2) spectra respond largely as simulated to the optical properties of water clouds over ocean during November 2015 (N=184,318) using input cloud properties from the Moderate Resolution Imaging Spectroradiometer (MODIS) on Aqua and the Cloud-Aerosol Lidar with Orthogonal Polarization on Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO). In A-band continuum channels the standard deviation of simulated minus observed radiance is 37%. Selecting horizontally homogeneous clouds to mitigate three-dimensional cloud effects and collocation error with the other satellites, the standard deviation of the residuals is reduced to 18%. Using a look-up table developed from simulations, OCO-2's estimated cloud top pressure for low clouds (P-top>680hPa) has a standard deviation of 61hPa relative to CALIPSO retrievals, and bias is dependent on assumed cloud pressure thickness, with our smallest value being -5hPa. Versus MODIS optical depth, the standard deviation is 9.0 and the bias is -2.0, although these shrink for clouds of styled-content style-type=mathematics 30. These values include collocation error between the different satellites, meaning that they place an upper bound on the OCO-2 retrieval uncertainty. The theoretical precision limit from OCO-2's instrumental uncertainty is shown to be +/- 2.4hPa in above-cloud path and +/- 0.2% in optical depth for a two-channel retrieval. Options for retrieving cloud optical depth, cloud top pressure, and pressure thickness are discussed in the context of a formal OCO-2 cloud property retrieval. |
英文关键词 | cloud retrieval oxygen A-band clouds OCO-2 MODIS CALIPSO |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000408349500033 |
WOS关键词 | GASES OBSERVING SATELLITE ; BOUNDARY-LAYER CLOUDS ; CLIMATE SENSITIVITY ; RETRIEVAL ALGORITHM ; LIDAR MEASUREMENTS ; EFFECTIVE RADIUS ; TOP HEIGHT ; PRESSURE ; SCATTERING ; RADIATION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32932 |
专题 | 气候变化 |
作者单位 | 1.CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA; 2.Univ Reading, Dept Meteorol, Reading, Berks, England; 3.Colorado State Univ, Cooperat Inst Res Atmosphere, Ft Collins, CO 80523 USA |
推荐引用方式 GB/T 7714 | Richardson, Mark,McDuffie, James,Stephens, Graeme L.,et al. The OCO-2 oxygen A-band response to liquid marine cloud properties from CALIPSO and MODIS[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(15). |
APA | Richardson, Mark,McDuffie, James,Stephens, Graeme L.,Cronk, Heather Q.,&Taylor, Tommy E..(2017).The OCO-2 oxygen A-band response to liquid marine cloud properties from CALIPSO and MODIS.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(15). |
MLA | Richardson, Mark,et al."The OCO-2 oxygen A-band response to liquid marine cloud properties from CALIPSO and MODIS".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.15(2017). |
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