About this Dataset

Using Open-Path Dual-Comb Spectroscopy To Monitor Methane Emissions From Simulated Grazing Cattle

Data published in the paper "Using Open-Path Dual-Comb Spectroscopy to Monitor Methane Emissions from Simulated Grazing Cattle". A controlled methane release experiment was performed to determine if dual comb spectroscopy (DCS) can detect methane concentration enhancements above the atmospheric background produced by a typical herd of beef cattle in an extensive grazing system. Open-path DCS was used to measure downwind and upwind methane concentrations from ten point-sources of methane simulating cattle. The assets include all data taken during the field campaign, calculated methane flux, and data explicitly plotted in the paper figures.
Organization: Department of Commerce
Last updated: 2025-09-30T05:29:09.141987
Tags: agriculture, atmospheric-measurements

Tables

All DCS Data

@usgov.doc_gov_using_open_path_dual_comb_spectroscopy_to_moni_47650e7f.all_dcs_data

1.28 MB
35,184 rows
39 columns

CREATE TABLE all_dcs_data (
  "dtobj" TIMESTAMP,
  "time_stamp" BIGINT,
  "date" TIMESTAMP,
  "tod" VARCHAR,
  "doy" DOUBLE,
  "igm_time" DOUBLE,
  "tshasdata" DOUBLE,
  "igms_per_pc" DOUBLE,
  "ch0_p2p" DOUBLE,
  "ch0_reduced_chi2" DOUBLE,
  "ch0_h2o_molefraction" DOUBLE,
  "ch0_h2o_molefraction_err" DOUBLE,
  "ch0_co2_molefraction" DOUBLE,
  "ch0_co2_molefraction_err" DOUBLE,
  "ch0_ch4_molefraction" DOUBLE,
  "ch0_ch4_molefraction_err" DOUBLE,
  "ch0_t_k" DOUBLE,
  "ch0_t_k_err" DOUBLE,
  "ch0_p_mbar" DOUBLE,
  "ch0_p_mbar_err" DOUBLE,
  "ch1_p2p" DOUBLE,
  "ch1_reduced_chi2" DOUBLE,
  "ch1_h2o_molefraction" DOUBLE,
  "ch1_h2o_molefraction_err" DOUBLE,
  "ch1_co2_molefraction" DOUBLE,
  "ch1_co2_molefraction_err" DOUBLE,
  "ch1_ch4_molefraction" DOUBLE,
  "ch1_ch4_molefraction_err" DOUBLE,
  "ch1_t_k" DOUBLE,
  "ch1_t_k_err" DOUBLE,
  "ch1_p_mbar" DOUBLE,
  "ch1_p_mbar_err" DOUBLE,
  "igms_per_pc1" DOUBLE,
  "igms_quality" DOUBLE,
  "igms_quality1" DOUBLE,
  "snr" DOUBLE,
  "snr1" DOUBLE,
  "ch0_path_cm" DOUBLE,
  "ch1_path_cm" DOUBLE
);

AllInput 15min Synchronized Release

@usgov.doc_gov_using_open_path_dual_comb_spectroscopy_to_moni_47650e7f.allinput_15min_synchronized_release

1.48 MB
9,943 rows
29 columns

CREATE TABLE allinput_15min_synchronized_release (
  "dtobj" TIMESTAMP,
  "date" VARCHAR,
  "time" VARCHAR,
  "doy" DOUBLE,
  "sonic_temperature" DOUBLE,
  "air_temperature" DOUBLE,
  "air_pressure" DOUBLE,
  "u_unrot" DOUBLE,
  "v_unrot" DOUBLE,
  "w_unrot" DOUBLE,
  "u_rot" DOUBLE,
  "v_rot" DOUBLE,
  "w_rot" DOUBLE,
  "wind_speed" DOUBLE,
  "wind_dir" DOUBLE,
  "u" DOUBLE  -- U*,
  "l" DOUBLE,
  "u_var" DOUBLE,
  "v_var" DOUBLE,
  "w_var" DOUBLE,
  "ts_var" DOUBLE,
  "cov_u_v" DOUBLE  -- Cov(u/v),
  "cov_u_w" DOUBLE  -- Cov(u/w),
  "cov_u_ts" DOUBLE  -- Cov(u/ts),
  "cov_v_w" DOUBLE  -- Cov(v/w),
  "cov_v_ts" DOUBLE  -- Cov(v/ts),
  "cov_w_ts" DOUBLE  -- Cov(w/ts),
  "n_ch4dry" DOUBLE  -- N[CH4dry],
  "s_ch4dry" DOUBLE  -- S[CH4dry]
);

Data File: Figure1 IGM

@usgov.doc_gov_using_open_path_dual_comb_spectroscopy_to_moni_47650e7f.data_file_figure1_igm

44.64 MB
957,418 rows
5 columns

CREATE TABLE data_file_figure1_igm (
  "unnamed_0" BIGINT  -- Unnamed: 0,
  "time_ps" DOUBLE,
  "wavenumber_cm_1" DOUBLE,
  "igm" DOUBLE,
  "spectrum" DOUBLE
);

Figure4a AllanWerleData

@usgov.doc_gov_using_open_path_dual_comb_spectroscopy_to_moni_47650e7f.figure4a_allanwerledata

8.19 kB
46 rows
7 columns

CREATE TABLE figure4a_allanwerledata (
  "unnamed_0_1" BIGINT  -- Unnamed: 0.1,
  "unnamed_0" BIGINT  -- Unnamed: 0,
  "tau" DOUBLE,
  "ch0_ch4_oadev" DOUBLE,
  "ch0_ch4_oadev_err" DOUBLE,
  "ch1_ch4_oadev" DOUBLE,
  "ch1_ch4_oadev_err" DOUBLE
);

Figure5 InitialRelease

@usgov.doc_gov_using_open_path_dual_comb_spectroscopy_to_moni_47650e7f.figure5_initialrelease

18.67 kB
288 rows
6 columns

CREATE TABLE figure5_initialrelease (
  "dtobj" TIMESTAMP,
  "windspeed" DOUBLE,
  "winddirection" DOUBLE,
  "rch4_northbeamline" DOUBLE,
  "rch4_southbeamline" DOUBLE,
  "ch4_enhancement" DOUBLE
);

Figure6 StepRelease

@usgov.doc_gov_using_open_path_dual_comb_spectroscopy_to_moni_47650e7f.figure6_steprelease

10.46 kB
32 rows
10 columns

CREATE TABLE figure6_steprelease (
  "dtobj" TIMESTAMP,
  "u" DOUBLE  -- U*,
  "winddirection" DOUBLE,
  "rch4_northbeamline" DOUBLE,
  "rch4_southbeamline" DOUBLE,
  "snr_northbeamline" DOUBLE,
  "snr_southbeamline" DOUBLE,
  "idmflux" DOUBLE,
  "idmfluxerror" DOUBLE,
  "releaseflux" DOUBLE
);

Figure7 NoRelease

@usgov.doc_gov_using_open_path_dual_comb_spectroscopy_to_moni_47650e7f.figure7_norelease

8.08 kB
25 rows
8 columns

CREATE TABLE figure7_norelease (
  "dtobj" TIMESTAMP,
  "u" DOUBLE  -- U*,
  "winddirection" DOUBLE,
  "rch4_northbeamline" DOUBLE,
  "rch4_southbeamline" DOUBLE,
  "idmflux" DOUBLE,
  "idmfluxerror" DOUBLE,
  "releaseflux" DOUBLE
);

Figure8 ToggleRelease

@usgov.doc_gov_using_open_path_dual_comb_spectroscopy_to_moni_47650e7f.figure8_togglerelease

13.22 kB
33 rows
13 columns

CREATE TABLE figure8_togglerelease (
  "dtobj" TIMESTAMP,
  "u" DOUBLE  -- U*,
  "winddirection" DOUBLE,
  "rch4_northbeamline" DOUBLE,
  "rch4_southbeamline1" DOUBLE,
  "rch4_southbeamline2" DOUBLE,
  "snr_northbeamline" DOUBLE,
  "snr_southbeamline1" DOUBLE,
  "snr_southbeamline2" DOUBLE,
  "idmflux_southbeamline1" DOUBLE,
  "idmflux_southbeamline2" DOUBLE,
  "idmfluxerror" DOUBLE,
  "releaseflux" DOUBLE
);

Table 5

@usgov.doc_gov_using_open_path_dual_comb_spectroscopy_to_moni_47650e7f.table_5

540.78 kB
11,980 rows
5 columns

CREATE TABLE table_5 (
  "unnamed_0" BIGINT  -- Unnamed: 0,
  "wavenumber_cm_1" DOUBLE,
  "data" DOUBLE,
  "fit" DOUBLE,
  "residual" DOUBLE
);