Dataset Open Access

Dataset for "Attribution of the accelerating increase in atmospheric methane during 2010–2018 by inverse analysis of GOSAT observations"

Yuzhong Zhang; Daniel J. Jacob; Xiao Lu; Joannes D. Maasakkers; Tia R. Scarpelli; Jian-Xiong Sheng; Lu Shen; Zhen Qu; Melissa P. Sulprizio; Jinfeng Chang; A. Anthony Bloom; Shuang Ma; John Worden; Robert J. Parker; Hartmut Boesch

The dataset includes results from a global inversion of GOSAT methane observations documented in Zhang et al. (2021).  The inversion is performed with the GEOS-Chem model for the period of 2010-2018. We optimize mean and trend of non-wetland emissions, monthly wetland emissions for 14 subcontinental regions, and annual hemispheric OH concentrations (methane loss rates). Sector attribution of posterior non-wetland emissions in a 4ox5o grid cell is done on the basis of the relative contribution of a sector to prior emissions in the grid cell. Detailed description of the methodology can be found in Zhang et al. (2021).

Reference

Zhang et al., Attribution of the accelerating increase in atmospheric methane during 2010–2018 by inverse analysis of GOSAT observations, Atmos. Chem. Phys., 21,  3643–3666, https://doi.org/10.5194/acp-21-3643-2021, 2021.

 

Date files

The dataset includes 4 files:

1. GlobalInv_v1.nc is the main data file, which includes (1) prior estimates (prior_value), (2) posterior scaling factor (post_sf), (3) prior error covariance matrix (prior_errcov), (4) posterior error covariance matrix (post_errcov), and (5) averaging kernel matrix (post_ak) for the state vector. All the values are expressed relative to prior_values, except for prior_value which is expressed in absolute magnitude.

2. State_vec.csv is a table which indexes the state vector elements, for non-wetland emission (PertA) (1-1009), non-wetland emission trends (PertT) (1010-2018), wetland emissions (PertW) (2019-3530), and hemispheric OH (PertN for Northern Hemisphere and PertS for Southern Hemisphere) (3531-3548).

3. Clusters_nonwetland.nc contains a 72x46 matrix (corresponding to GEOS-Chem 4x5 degree grid) that maps grid cells to non-wetland emission grid-cell ID.

4. Clusters_wetland.nc contains a 72x46 matrix (corresponding to GEOS-Chem 4x5 degree grid) that maps grid cells to wetland emission region ID. 

Files (151.3 MB)
Name Size
Clusters_nonwetlands.nc
md5:f0abc34174101e450f8e1bb20d469e42
22.3 kB Download
Clusters_wetlands.nc
md5:729c2e5b9c6a1cda4674cb5cb1b92f48
28.2 kB Download
GlobalInv_v1.nc
md5:63ad2e14e186a3f4fdbd7e3a7afd15e8
151.1 MB Download
state_vec.csv
md5:8acdaa4d6ea8ee20616c636e92d83a8a
122.5 kB Download
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