The Orbiting Carbon Observatory-2: first 18 months of science data products
The Orbiting Carbon Observatory-2: first 18 months of science data products
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DOI：
10.5194/amt-10-549-2017
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发表时间：
2017-02-15
影响因子：
3.8
通讯作者：
Yoshimizu, Jan
中科院分区：
文献类型：
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作者：
Eldering, Annmarie;O'Dell, Chris W.;Yoshimizu, Jan
轨道碳观测站-2（OCO-2）是美国国家航空航天局（NASA）设计的第一颗测量大气二氧化碳（CO2）的卫星，其精度，分辨率和覆盖范围需要量化区域尺度上的CO2通量（源和汇）。OCO-2于2014年7月2日成功发射，并收集了两年多的观测数据。这里讨论的是2014年9月至2016年1月的v7/v7 r运行数据产品。在每月的时间尺度上，这些测量中有7%到12%是足够无云和气溶胶的，以产生通过所有质量测试的柱平均大气CO2干空气摩尔分数XCO 2的估计值。在运行的第一年，观测策略、仪器校准和检索算法都得到了优化，以提高数据产量和产品的准确性。随着这些变化，来自OCO-2数据的XCO 2全球地图揭示了大气碳循环的一些最强大的特征。这包括XCO 2的增强与美国东部和中国东部强烈的化石燃料排放共存，这在10月至12月之间最为明显，当时南北XCO 2梯度很小。在亚马逊、中非和印度尼西亚，与生物质燃烧同时发生的XCO 2增加在这个季节也很明显。在5月和6月，当南北XCO 2梯度最大时，这些来源在全球地图上不太明显。在一年中的这一部分，OCO- 2地图显示整个北方半球的XCO 2减少了10 ppm以上，因为陆地生物圈的光合作用迅速吸收了CO 2。随着碳循环科学界继续分析这些OCO-2数据，关于区域尺度源9排放者和汇9吸收者的信息将从这个高分辨率的全球数据集中出现，这些信息使XCO 2的变化达到1 ppm的数量级，以及更微妙的特征。
The Orbiting Carbon Observatory-2 (OCO-2) is the first National Aeronautics and Space Administration (NASA) satellite designed to measure atmospheric carbon dioxide (CO2/with the accuracy, resolution, and coverage needed to quantify CO2 fluxes (sources and sinks) on regional scales. OCO-2 was successfully launched on 2 July 2014 and has gathered more than 2 years of observations. The v7/v7r operational data products from September 2014 to January 2016 are discussed here. On monthly timescales, 7 to 12% of these measurements are sufficiently cloud and aerosol free to yield estimates of the column-averaged atmospheric CO2 dry air mole fraction, XCO2, that pass all quality tests. During the first year of operations, the observing strategy, instrument calibration, and retrieval algorithm were optimized to improve both the data yield and the accuracy of the products. With these changes, global maps of XCO2 derived from the OCO-2 data are revealing some of the most robust features of the atmospheric carbon cycle. This includes XCO2 enhancements co-located with intense fossil fuel emissions in eastern US and eastern China, which are most obvious between October and December, when the north-south XCO2 gradient is small. Enhanced XCO2 coin-cident with biomass burning in the Amazon, central Africa, and Indonesia is also evident in this season. In May and June, when the north- south XCO2 gradient is largest, these sources are less apparent in global maps. During this part of the year, OCO- 2 maps show a more than 10 ppm reduction in XCO2 across the Northern Hemisphere, as photosynthesis by the land biosphere rapidly absorbs CO2. As the carbon cycle science community continues to analyze these OCO-2 data, information on regional-scale sources 9emitters) and sinks 9absorbers) which impart XCO2 changes on the order of 1 ppm, as well as far more subtle features, will emerge from this high-resolution global dataset.