EMAC-MESSy source segregated CH4 mixing ratios simulated along CARIBIC flight tracks

The *.zip archives contain netCDF data files with EMAC-model simulated CH4 mixing ratios (nmol/mol) along CARIBIC-flight tracks during the years 1997 through 2016 in the upper troposphere and lowermost stratosphere.

CARIBIC2org.zip:

Every .nc file contains time, lon, lat, and track pressure of the flight simulation and the vertical column of mixing ratios in hybride coordinates total CH4 and eleven source segregated (tagged) contributions. For a best fit of the observations the .nc files have to be multiplied with the scale factors in column 3.

CARIBIC_tag_emi_org*CARIBIC2.nc:

Tracer:         variable name:

CH4 total      tracer_gp_CH4_fx

CH4 tagged:    variable name:                     scale:

animals           tracer_gp_CH4_fx_e01_a01  0.87

bogs               tracer_gp_CH4_fx_e02_a01  1.04

coal                tracer_gp_CH4_fx_e03_a01  0.87

gas                 tracer_gp_CH4_fx_e04_a01  0.89

landfills           tracer_gp_CH4_fx_e05_a01  0.95

oil                  tracer_gp_CH4_fx_e06_a01  0.91

rice                tracer_gp_CH4_fx_e07_a01  1.04

swamps         tracer_gp_CH4_fx_e08_a01  1.13

termits           tracer_gp_CH4_fx_e09_a01  1.13

biomass burn  tracer_gp_CH4_fx_e10_a01  1.13

biofuel            tracer_gp_CH4_fx_e11_a01  1.13

CARIBICric.zip, CARIBICsha.zip: CARIBICtro.zip:

In these arcives every .nc file contains time, lon, lat, and track pressure of the flight simulation and the simulated mixing ratios along the flight tracks for the post 2006 CH4 increments to be added to the above totals. The increments have to be scaled with the factors in colums 3 for an optimal fit of the observations.

CARIBICric.zip: CARIBIC_tag_emi_ric*.nc

Tracer:          variable name:            scale:

CH4 rice       tracer_gp_CH4_fx        0.48

CARIBICsha.zip: CARIBIC_tag_emi_sha*.nc

Tracer:              variable name:             scale:

CH4 shale gas   tracer_gp_CH4_fx        0.48

CARIBICtro.zip: CARIBIC_tag_emi_tro*.nc

Tracer:           variable name:             scale:

CH4 tropics    tracer_gp_CH4_fx        0.04

The mixing ratios are based on emission amounts of 20.5 Tg/CH4/y for each, rice-, shale gas fracking-, and tropical wetlands. The best fit of the observations is a combination of them multiplied with the scale factors in column 3.

The corresponding CH4 total mixing ratios (together with other species) are available on demand via http://www.caribic-atmospheric.com "Data access".

References:

This study:

Zimmermann, P. H., Brenninkmeijer, C. A. M., Pozzer, A., Jöckel, P., Winterstein, F., Zahn, A., Houweling, S., and Lelieveld, J.: Model simulations of atmospheric methane (1997–2016) and their evaluation using NOAA and AGAGE surface and IAGOS-CARIBIC aircraft observations, Atmos. Chem. Phys., 20, 1–23, https://doi.org/10.5194/acp-20-1-2020 ,2020

The CARIBIC project:

Brenninkmeijer, C. A. M., Crutzen, P., Boumard, F., Dauer, T., Dix, B., Ebinghaus, R., Filippi, D., Fischer, H., Franke, H., Fries, U., Heintzenberg, J., Helleis, F., Hermann, M., Kock, H. H., Koeppel, C., Lelieveld, J., Leuenberger, M., Martinsson, B. G., Miemczyk, S., Moret, H. P., Nguyen, H. N., Nyfeler, P., Oram, D., O'Sullivan, D., Penkett, S., Platt, U., Pupek, M., Ramonet, M., Randa, B., Reichelt, M., Rhee, T. S., Rohwer, J., Rosenfeld, K., Scharffe, D., Schlager, H., Schumann, U., Slemr, F., Sprung, D., Stock, P., Thaler, R., Valentino, F., van Velthoven, P., Waibel, A., Wandel, A., Waschitschek, K., Wiedensohler, A., Xueref-Remy, I., Zahn, A., Zech, U., and Ziereis, H.: Civil Aircraft for the regular investigation of the atmosphere based on an instrumented container: The new CARIBIC system, Atmos. Chem. Phys., 7, 4953-4976, doi:10.5194/acp-7-4953-2007, 2007.

EMAC atmospheric chemistry model:

Jöckel, P., Kerkweg, A., Pozzer, A., Sander, R., Tost, H., Riede, H., Baumgaertner, A., Gromov, S., and Kern, B.: Development cycle 2 of the Modular Earth Submodel System (MESSy2), Geosci. Model Dev., 3, 717-752, doi:10.5194/gmd-3-717-2010, 2010.