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Acronyms
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Acronym | Description | | tediv | Divergence of vertical integral of total energy flux | | tefle | Vertical integral of eastward total energy flux | | tefln | Vertical integral of northward total energy flux | | tetend | Tendency of vertical integral of total energy | | lhdiv | Divergence of vertical integral of latent heat flux | | lhfle | Vertical integral of eastward latent heat flux | | lhfln | Vertical integral of northward latent heat flux | | lhtend | Tendency of vertical integral of latent heat | | wvdiv | Divergence of vertical integral of water vapour flux | | wvfle | Vertical integral of eastward water vapour flux | | wvfln | Vertical integral of northward water vapour flux | | wvtend | Tendency of vertical integral of water vapour | | Re | Residual of the dry air mass budget | | T | Temperature in Kelvin | | Tc | Temperature in Celsius | | q | Specific humidity | | v | Horizontal wind field vector | | pS | Surface pressure | | P | Precipitation | | E | Evaporation | | Φ | Geopotential | | k | Kinetic energy of air | | Lv | Latent heat of vaporization | | g | Gravitational acceleration (9.81 m s-2) | | cp | Specific heat capacity of dry air at constant pressure (1004.70 J kg-1 K-1) | | cv | Specific heat capacity of dry air at constant volume (717.65 J kg-1 K-1) | | cl | Specific heat of liquid water (4218.00 J kg-1 K-1) | | cpv | Specific heat of water vapor at constant pressure (1846.10 J kg-1 K-1) |
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- The divergence terms (tediv, lhdiv, wvdiv) with full spectral resolution show artificial pattern of numerical noise over high topography, which are thus spectrally truncated at wave number 180. The divergence fields with full spectral resolution (see example in Fig. 1) can be reconstructed by computing the divergence of corresponding north- and eastward fluxes provided in this dataset.
- The ocean-to-land energy transport as estimated from tediv exhibits an unrealistically strong gradual change in the late 1990s and early 2000s, which likely stems from changes in the observing system that has been assimilated by ERA5 (see Mayer et al. 2021 for discussion).
- Global ocean and land averages of wvdiv exhibit a reasonably strong but statistically insignificant trend over the available period, see Mayer et al. (2021) for further details.
Image Added
Figure 1: The divergence of the vertical integral of total energy flux (left) truncated at wave number 180, and (right) with full spectral resolution T639.
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Mayer, M., Haimberger, L., Edwards, J. M., and Hyder, P. (2017). Toward consistent diagnostics of the coupled atmosphere and ocean energy budgets. Journal of Climate, 30(22), 9225-9246. https://doi.org/10.1175/JCLI-D-17-0137.1
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