Volume 40 Issue 4
Jun.  2021
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Siqi Zhang, Yan Bai, Xianqiang He, Haiqing Huang, Qiangkun Zhu, Fang Gong. Comparisons of OCO-2 satellite derived XCO2 with in situ and modeled data over global ocean[J]. Acta Oceanologica Sinica, 2021, 40(4): 136-142. doi: 10.1007/s13131-021-1844-9
Citation: Siqi Zhang, Yan Bai, Xianqiang He, Haiqing Huang, Qiangkun Zhu, Fang Gong. Comparisons of OCO-2 satellite derived XCO2 with in situ and modeled data over global ocean[J]. Acta Oceanologica Sinica, 2021, 40(4): 136-142. doi: 10.1007/s13131-021-1844-9

Comparisons of OCO-2 satellite derived XCO2 with in situ and modeled data over global ocean

doi: 10.1007/s13131-021-1844-9
Funds:  The National Key Research and Development Programme of China under contract No. 2017YFA0603004; the Fund of Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang) (Zhanjiang Bay Laboratory) under contract No. ZJW-2019-08; the National Natural Science Foundation of China under contract Nos 41825014, 41676172 and 41676170; the Global Change and Air-Sea Interaction Project of China under contract Nos GASI-02-SCS-YGST2-01, GASI-02-PACYGST2-01 and GASI-02-IND-YGST2-01.
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  • Corresponding author: E-mail: zhuqiankun@sio.org.cn)
  • Received Date: 2020-09-07
  • Accepted Date: 2020-12-29
  • Available Online: 2021-05-07
  • Publish Date: 2021-06-03
  • Atmospheric CO2 is one of key parameters to estimate air-sea CO2 flux. The Orbiting Carbon Observatory-2 (OCO-2) satellite has observed the column-averaged dry-air mole fractions of global atmospheric carbon dioxide (XCO2) since 2014. In this study, the OCO-2 XCO2 products were compared between in-situ data from the Total Carbon Column Network (TCCON) and Global Monitoring Division (GMD), and modeling data from CarbonTracker2019 over global ocean and land. Results showed that the OCO-2 XCO2 data are consistent with the TCCON and GMD in situ XCO2 data, with mean absolute biases of 0.25×10−6 and 0.67×10−6, respectively. Moreover, the OCO-2 XCO2 data are also consistent with the CarbonTracker2019 modeling XCO2 data, with mean absolute biases of 0.78×10−6 over ocean and 1.02×10−6 over land. The results indicated the high accuracy of the OCO-2 XCO2 product over global ocean which could be applied to estimate the air-sea CO2 flux.
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