A decade of GOSAT Proxy satellite CH4 observations

A decade of GOSAT Proxy satellite CH4 observations
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GOSAT 代理卫星 CH4 观测十年

DOI:
10.5194/essd-2020-114
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发表时间:
2020
影响因子:
11.4
通讯作者:
D. Wunch
D. Wunch
中科院分区:
地球科学1区
文献类型:
--
作者:
R. Parker;Alex J. Webb;H. Boesch;P. Somkuti;Rocio Barrio Guillo;A. Di Noia;N. Kalaitzi;J. Anand;P. Bergamaschi;F. Chevallier;P. Palmer;Liang Feng;N. Deutscher;D. Feist;D. Griffith;F. Hase;R. Kivi;I. Morino;J. Notholt;Y. Oh;H. Ohyama;C. Petri;D. Pollard;C. Roehl;M. Sha;K. Shiomi;K. Strong;R. Sussmann;Y. Té;V. Velazco;T. Warneke;P. Wennberg;D. Wunch

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抽象的。这项工作介绍了莱斯特大学GOSAT代理XCH 4数据集的最新版本(v9.0)。自2009年发射GOSAT卫星以来,这些数据由英国国家地球观测中心(NCEO)制作,作为欧空局温室气体气候变化倡议(GHG-CCI)和哥白尼气候变化服务(C3 S)项目的一部分。通过十多年的观察,我们概述了使用这些数据的过去版本进行的许多科学研究,以强调未来如何使用最新版本。我们详细描述了数据是如何生成的,为整个处理链提供信息和统计数据,从L1 B光谱数据到最终的质量过滤柱平均干空气摩尔分数(XCH 4)数据。我们发现,在2009年4月至2019年12月期间进行的1950万次观测中,我们确定其中730万次观测足够无云(37.6%),可以进一步处理并最终获得460万次(23.5%)高质量XCH 4观测。我们将这些总数按观测模式(陆地和海洋太阳闪烁)和月份分开,为数据用户提供预期的数据覆盖范围,包括突出显示由于仪器问题而减少观测的时期。我们对总碳柱观测网络(TCCON)的数据进行了广泛的验证,并与全球22个地点的地面观测进行了比较。我们发现与TCCON非常一致,88345个共定位测量的总体相关系数为0.92。单次测量精度为13.72 ppb,确定了9.06 ppb的总体偏差,并从代理XCH 4数据中删除。此外,我们验证了代理的单独组件(即建模的XCO 2和XCH 4 scinXCO 2比),并发现这些与TCCON非常一致。为了显示数据对未来研究的实用性,我们与TM 5模型模拟的XCH 4进行了比较。我们发现,在整个空间和时间的模型和观测之间的高度一致性。当关注特定区域时,我们发现平均差异仅为3.9至15.4 ppb。我们发现季节性周期的相位和幅度非常一致,平均相关系数为0.93,所有地区的平均季节性周期幅度差异为-0.84 ppb。这些数据可参见https://doi.org/10.5285/18ef8247f52a4cb6a14013f8235cc1eb(帕克和Boesch,2020)。
Abstract. This work presents the latest release (v9.0) of the University of Leicester GOSAT Proxy XCH4 dataset. Since the launch of the GOSAT satellite in 2009, these data have been produced by the UK National Centre for Earth Observation (NCEO) as part of the ESA Greenhouse Gas Climate Change Initiative (GHG-CCI) and Copernicus Climate Change Services (C3S) projects. With now over a decade of observations, we outline the many scientific studies achieved using past versions of these data in order to highlight how this latest version may be used in the future. We describe in detail how the data are generated, providing information and statistics for the entire processing chain from the L1B spectral data through to the final quality-filtered column-averaged dry-air mole fraction (XCH4) data. We show that out of the 19.5 million observations made between April 2009 and December 2019, we determine that 7.3 million of these are sufficiently cloud-free (37.6 %) to process further and ultimately obtain 4.6 million (23.5 %) high-quality XCH4 observations. We separate these totals by observation mode (land and ocean sun glint) and by month, to provide data users with the expected data coverage, including highlighting periods with reduced observations due to instrumental issues. We perform extensive validation of the data against the Total Carbon Column Observing Network (TCCON), comparing to ground-based observations at 22 locations worldwide. We find excellent agreement with TCCON, with an overall correlation coefficient of 0.92 for the 88 345 co-located measurements. The single-measurement precision is found to be 13.72 ppb, and an overall global bias of 9.06 ppb is determined and removed from the Proxy XCH4 data. Additionally, we validate the separate components of the Proxy (namely the modelled XCO2 and the XCH4∕XCO2 ratio) and find these to be in excellent agreement with TCCON. In order to show the utility of the data for future studies, we compare against simulated XCH4 from the TM5 model. We find a high degree of consistency between the model and observations throughout both space and time. When focusing on specific regions, we find average differences ranging from just 3.9 to 15.4 ppb. We find the phase and magnitude of the seasonal cycle to be in excellent agreement, with an average correlation coefficient of 0.93 and a mean seasonal cycle amplitude difference across all regions of −0.84 ppb. These data are available at https://doi.org/10.5285/18ef8247f52a4cb6a14013f8235cc1eb (Parker and Boesch, 2020).
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