Dataset
DESIRE: Chemical traces and meteorological measurements from TOMCAT model
Abstract
DESIRE (Dynamics of the Earth System and the Ice-Core Record) was part of QUEST (Quantifying and Understanding the Earth System) Theme 2.
This dataset contains measurements of chemical traces and meteorological from the TOMCAT (Tropospheric Offline Model of Chemistry and Transport model), as part of the Work Package 1.3.
The aim of this work package was to identify any atmospheric chemical signal preserved in the ice-core record that could be used to differentiate between the influences on atmospheric methane of changes in methane emissions and changes in oxidising capacity between the Last Glacial Maximum (LGM) and the pre-industrial era (PI). A series of experiments was carried out using the Cambridge parallelised-Tropospheric Offline Model of Chemistry and Transport (p-TOMCAT; v2.0 beta), the results to which are contained in this dataset.
Details
| Previous Info: |
No news update for this record
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|---|---|
| Previously used record identifiers: |
http://badc.nerc.ac.uk/view/badc.nerc.ac.uk__ATOM__dep_12444766383727698
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| Access rules: |
Access to these data is available to any registered CEDA user. Please Login or Register for an account to gain access.
Use of these data is covered by the following licence: http://licences.ceda.ac.uk/image/data_access_condition/quest.pdf. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record. |
| Data lineage: |
Data collected as part of QUEST project support |
| Data Quality: |
Not known.
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| File Format: |
Data are netCDF formatted
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Related Documents
| Desire WP1.3, Data description |
| QUEST report |
| DESIRE |
Process overview
| Title | p-TOMCAT deployed on Cambridge University computer |
| Abstract | The Cambridge p-TOMCAT model is a 3D global Eulerian model, driven by meteorological fields (winds, temperatures and humidities) from the operational analyses of the European Centre for Medium-range Weather Forecasts. For the purposes of this work, it was run at a resolution of ~2.8° x ~2.8° on 31 hybrid sigma-pressure levels. The levels stretch from the surface to 10hPa with a spacing of approximately 100m in the boundary layer and 1-1.5km in the vicinity of the tropopause. The model’s chemistry includes 52 species and 174 reactions that together describe the gas-phase HOx/NOx chemistries of methane, ethane, propane and isoprene; isoprene oxidation follows the Mainz Isoprene Mechanism (Pöschl et al., 2000). Five experiments are carried out. The first comprises a PI model run, employing appropriate trace-gas emissions (Valdes et al., 2005); the remaining four comprise highly idealised experiments derived from the PI model run. In the first two, the annual-mean concentration of methane in the Antarctic boundary layer is reduced from its PI value of ~710 ppbv to ~345 ppbv, roughly the concentration of methane present at the LGM, either by increasing the production of OH by a factor of 2.5 (Sink 1) or by uniformly scaling-down the emissions of methane by a factor of 0.55 (Source 1). In the remaining two experiments, the concentration of methane is reduced to ~555 ppbv by removing all non-methane emissions from vegetation (Sink 2) or by scaling-down the emissions of methane by a factor of 0.83 (Source 2). In each experiment, the model is run to equilibrium with repeated meteorological fields from a single year (1997). The model is subsequently run for three consecutive years (1998-2000) to explore inter-annual variations. It is during these three years that the data contained in this dataset are gathered. The combination of five experiments and three years of meteorology gives rise to a total of fifteen files, each containing fully 3D monthly-mean chemical fields in addition to some meteorological fields (see below). They follow the nomenclature, desire_bas_p tomcat_EXPERIMENT_METEOROLOGY.nc, where EXPERIMENT=’pi’, ‘sink1’, ‘source1’,’sink2’ or ‘source2’; and METEOROLOGY=’1998’, ‘1999’ or ‘2000’). |
| Input Description | None |
| Output Description | None |
| Software Reference | None |
- units: 1
- var_id: MeCHO_mm
- long_name: Acetaldehyde monthly mean
- units: 1
- var_id: Me2CO_mm
- long_name: Acetone monthly mean
- units: K
- var_id: PT_mm
- long_name: Advected Potential Temperature monthly mean
- units: 1
- var_id: SPECH_mm
- long_name: Advected Specific Humidity monthly mean
- units: 1
- var_id: O1D_mm
- long_name: Atomic Oxygen (excited state) monthly mean
- units: 1
- var_id: O3P_mm
- long_name: Atomic Oxygen (ground state) monthly mean
- units: 1
- var_id: MeCOCH2OO_mm
- long_name: CH3COCH2OO monthly mean
- units: 1
- var_id: MeCOCH2OOH_mm
- long_name: CH3COCH2OOH monthly mean
- units: 1
- var_id: MeCO3_mm
- long_name: CH3COO2 monthly mean
- units: 1
- var_id: MeONO2_mm
- long_name: CH3ONO2 monthly mean
- units: 1
- var_id: MeOO_mm
- long_name: CH3OO monthly mean
- units: 1
- standard_name: mole_fraction_of_methyl_hydroperoxide_in_air
- var_id: MeOOH_mm
- long_name: CH3OOH monthly mean
- units: 1
- standard_name: mole_fraction_of_carbon_monoxide_in_air
- var_id: CO_mm
- long_name: Carbon Monoxide monthly mean
- units: 1
- standard_name: mole_fraction_of_carbon_dioxide_in_air
- var_id: CO2_mm
- long_name: Carbon dioxide monthly mean
- units: 1
- standard_name: mole_fraction_of_dinitrogen_pentoxide_in_air
- var_id: N2O5_mm
- long_name: Dinitrogen Pentoxide monthly mean
- units: 1
- var_id: EtCHO_mm
- long_name: EtCHO monthly mean
- units: 1
- var_id: EtCO3_mm
- long_name: EtCO3 monthly mean
- units: 1
- var_id: EtOO_mm
- long_name: EtOO monthly mean
- units: 1
- var_id: EtOOH_mm
- long_name: EtOOH monthly mean
- units: 1
- standard_name: mole_fraction_of_ethane_in_air
- var_id: C2H6_mm
- long_name: Ethane monthly mean
- units: 1
- var_id: C2H4_mm
- standard_name: mole_fraction_of_ethene_in_air
- long_name: Ethene monthly mean
- units: 1
- standard_name: mole_fraction_of_ethyne_in_air
- var_id: C2H2_mm
- long_name: Ethyne monthly mean
- units: 1
- standard_name: mole_fraction_of_formaldehyde_in_air
- var_id: HCHO_mm
- long_name: Formaldehyde monthly mean
- units: kg
- var_id: sm_mm
- long_name: Grid Box Mass monthly mean
- units: 1
- var_id: HACET_mm
- long_name: HACET monthly mean
- units: 1
- var_id: HCOOH_mm
- long_name: HCOOH monthly mean
- units: 1
- var_id: HONO_mm
- long_name: HONO monthly mean
- units: 1
- standard_name: mole_fraction_of_hydrogen_peroxide_in_air
- var_id: H2O2_mm
- long_name: Hydrogen Peroxide monthly mean
- units: 1
- var_id: H2_mm
- long_name: Hydrogen monthly mean
- units: 1
- standard_name: mole_fraction_of_hydroperoxyl_radical_in_air
- var_id: HO2_mm
- long_name: Hydroperoxyl Radical monthly mean
- units: 1
- standard_name: mole_fraction_of_hydroxyl_radical_in_air
- var_id: OH_mm
- long_name: Hydroxyl Radical monthly mean
- units: 1
- var_id: ISO2_mm
- long_name: ISO2 monthly mean
- units: 1
- var_id: ISON_mm
- long_name: ISON monthly mean
- units: 1
- var_id: ISOOH_mm
- long_name: ISOOH monthly mean
- units: 1
- standard_name: mole_fraction_of_isoprene_in_air
- var_id: C5H8_mm
- long_name: Isoprene monthly mean
- units: 1
- var_id: MACR_mm
- long_name: MACR monthly mean
- units: 1
- var_id: MACRO2_mm
- long_name: MACRO2 monthly mean
- units: 1
- var_id: MACROOH_mm
- long_name: MACROOH monthly mean
- units: 1
- var_id: MGLY_mm
- long_name: MGLY monthly mean
- units: 1
- var_id: MPAN_mm
- long_name: MPAN monthly mean
- units: 1
- var_id: MeCO2H_mm
- long_name: MeCO2H monthly mean
- units: 1
- var_id: MeCO3H_mm
- long_name: MeCO3H monthly mean
- units: m s-1
- standard_name: northward_wind
- var_id: vwind_mm
- long_name: Meridional Wind monthly mean
- long_name: Methane
- gcmd_url: http://vocab.ndg.nerc.ac.uk/term/P041/4/G138
- gcmd_keyword: EARTH SCIENCE > Atmosphere > Atmospheric Chemistry/Carbon and Hydrocarbon Compounds > Methane
- names: EARTH SCIENCE > Atmosphere > Atmospheric Chemistry/Carbon and Hydrocarbon Compounds > Methane, http://vocab.ndg.nerc.ac.uk/term/P041/4/G138
- units: 1
- standard_name: mole_fraction_of_methane_in_air
- var_id: CH4_mm
- long_name: Methane monthly mean
- units: 1
- var_id: NALD_mm
- long_name: NALD monthly mean
- units: 1
- var_id: NO3_mm
- long_name: Nitrate Radical monthly mean
- units: 1
- standard_name: mole_fraction_of_nitric_acid_in_air
- var_id: HONO2_mm
- long_name: Nitric Acid monthly mean
- units: 1
- standard_name: mole_fraction_of_nitrogen_monoxide_in_air
- var_id: NO_mm
- long_name: Nitric Oxide monthly mean
- units: 1
- standard_name: mole_fraction_of_nitrogen_dioxide_in_air
- var_id: NO2_mm
- long_name: Nitrogen Dioxide monthly mean
- units: 1
- var_id: N2_mm
- long_name: Nitrogen monthly mean
- units: 1
- var_id: O2_mm
- long_name: Oxygen monthly mean
- units: 1
- standard_name: mole_fraction_of_ozone_in_air
- var_id: O3_mm
- long_name: Ozone monthly mean
- units: 1
- var_id: PPAN_mm
- long_name: PPAN monthly mean
- units: 1
- standard_name: mole_fraction_of_peroxyacetyl_nitrate_in_air
- var_id: PAN_mm
- long_name: Peroxyacetyl Nitrate monthly mean
- units: 1
- standard_name: mole_fraction_of_peroxynitric_acid_in_air
- var_id: HO2NO2_mm
- long_name: Peroxynitric Acid monthly mean
- units: Pa
- standard_name: air_pressure
- var_id: p_mm
- long_name: Pressure monthly mean
- units: Pa
- var_id: ptrop2_mm
- long_name: Pressure of Dynamical Tropopause (380K/2.0PVU) monthly mean
- units: Pa
- var_id: ptrop1_mm
- long_name: Pressure of Dynamical Tropopause (380K/3.5PVU) monthly mean
- units: 1
- standard_name: mole_fraction_of_propane_in_air
- var_id: C3H8_mm
- long_name: Propane monthly mean
- units: 1
- standard_name: specific_humidity
- var_id: te_mm
- long_name: Specific humidity monthly mean
- units: 1
- var_id: O1DS_mm
- long_name: Stratospheric Excited State Atomic Oxygen monthly mean
- units: 1
- var_id: O3PS_mm
- long_name: Stratospheric Ground State Atomic Oxygen monthly mean
- units: 1
- var_id: NOXS_mm
- long_name: Stratospheric NOx monthly mean
- units: 1
- var_id: HNO3S_mm
- long_name: Stratospheric Nitric Acid monthly mean
- units: 1
- var_id: O3S_mm
- long_name: Stratospheric Ozone monthly mean
- units: 1
- var_id: NOYS_mm
- long_name: Stratospheric Reactive Nitrogen Species monthly mean
- units: 1
- standard_name: mole_fraction_of_water_vapor_in_air
- var_id: H2O_mm
- long_name: Water Vapour monthly mean
- units: m s-1
- standard_name: eastward_wind
- var_id: uwind_mm
- long_name: Zonal Wind monthly mean
- units: 1
- var_id: i_PrOO_mm
- long_name: i-PrOO monthly mean
- units: 1
- var_id: i_PrOOH_mm
- long_name: i-PrOOH monthly mean
- units: 1
- var_id: n_PrOO_mm
- long_name: n-PrOO monthly mean
- units: 1
- var_id: n_PrOOH_mm
- long_name: n-PrOOH monthly mean
Co-ordinate Variables
- units: degree_north
- standard_name: latitude
- var_id: latitude
- long_name: latitude at centre of grid box
- units: degree_east
- standard_name: longitude
- var_id: longitude
- long_name: longitude at centre of grid box
- standard_name: time
- var_id: time
- long_name: model time
Temporal Range
1998-01-01T00:00:00
2000-12-31T23:59:59
Geographic Extent
87.8638° |
||
-180.0000° |
180.0000° |
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-87.8638° |