Dataset
TOMCAT simulated Nord Stream methane plume, September 2022
Abstract
This file contains the simulated atmospheric methane (CH4) mixing ratios over the North Sea and Northern Europe during the Nord Stream gas leak event during September 2022. Mixing ratios are provide on the TOMCAT T106 model grid, with a horizontal resolution of approximately 1.125 x 1.125 degrees. There are 60 vertical levels from the surface up to 0.1 hPa. The data covers the period from 00:00 UTC 26/09/2022 - 00:00 UTC 30/09/2022. There are two methane tracers, one containing background methane and methane from non-Nord Stream related sources, and a separate model tracer simulating CH4 from the Nord Stream leaks. For this simulation, Nord Stream was assumed to emit methane at a constant rate of 4.17 Gg hr^(-1). These simulations are discussed in Wilson et al., (2024) - 'Quantifying large methane emissions from the Nord Stream pipeline gas leak of September 2022 using IASI satellite observations and inverse modelling'.
Details
| Previous Info: |
No news update for this record
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| Previously used record identifiers: |
No related previous identifiers.
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| Access rules: |
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence(s): http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record. |
| Data lineage: |
Originally produced by Chris Wilson at the National Centre for Earth Observation (NCEO) at the University of Leeds, Leeds, UK in October 2022. Submitted by Chris Wilson to CEDA on acceptance of the related research in July 2024. |
| Data Quality: |
Data are as provided by the data producer
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| File Format: |
NetCDF
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Process overview
| Title | TOMCAT model deployed on Leeds computer |
| Abstract | TOMCAT (and related SLIMCAT) is a global three-dimensional (3-D) off-line chemical transport model (CTM) which is developed and maintained at the University of Leeds. The model uses winds and temperatures from meteorological analyses (e.g. from the European Centre for Medium-Range Weather Forecasts) to specify the atmospheric transport and temperatures. The model then calculates the chemical composition of the troposphere and stratosphere based on the chemical scheme and inputs such as solar fluxes and trace gas emissions. The model has the option of detailed chemical scheme(s) for the stratosphere and troposphere and is the host model for the GLOMAP aerosol scheme. The model can be used to simulate the past and current atmosphere, to help interpret observations, and to diagnose the extent of environmental issues such as stratospheric ozone depletion or tropospheric pollution. INVICAT, the inverse version of TOMCAT, is used to derive surface emission fluxes. TCOM data products use machine learning to combine TOMCAT output and satellite observations. A number of datasets on CEDA have been produced with the TOMCAT model (and related SLIMCAT, INVICAT, TCOM). Further details of the specific model set-up are provided in dataset descriptions. |
| Input Description | None |
| Output Description | None |
| Software Reference | None |
- units: degrees_north
- var_id: LAT_EDGE
- units: degrees_east
- var_id: LON_EDGE
- units: Pa
- var_id: air_pressure
- units: K
- var_id: air_temperature
- units: degrees_north
- var_id: latitude
- var_id: level
- units: degrees_east
- var_id: longitude
- units: ppbv
- var_id: background_ch4_mixing_ratio
- long_name: methane_mixing_ratio_from_background_and_all_non_nord_stream_sources
- units: ppbv
- var_id: nord_stream_ch4_mixing_ratio
- long_name: methane_mixing_ratio_from_nord_stream_leak_with_constant_flux_of_4.17_ Gg_hr^-1
- var_id: time
- units: days
Co-ordinate Variables
Temporal Range
2022-09-26T00:00:00
2022-09-30T00:00:00
Geographic Extent
76.2600° |
||
-15.1900° |
20.8100° |
|
43.7400° |